Language selection

Search


[CCMC 13677-R] CCMC Canadian code compliance evaluation

In most jurisdictions this document is sufficient evidence for approval by Canadian authorities.

Learn more about CCMC recognition Look for the trusted CCMC mark on products to verify compliance.

Compliance opinion

It is the opinion of the Canadian Construction Materials Centre that the evaluated products, when used as fasteners for structural lumber connections in accordance with the conditions and limitations stated in this evaluation, comply with the following code:

National Building Code of Canada 2015

ID Code provision Solution type
04-03-01-01-00-0-004.3.1.1. Design Basis for WoodAlternative
09-23-03-01-00-0-009.23.3.1. Standards for Nails and ScrewsAlternative

The above opinion(s) is/are based on the evaluation by the CCMC of technical evidence provided by the evaluation holder, and is bound by the stated conditions and limitations. For the benefit of the user, a summary of the technical information that forms the basis of this evaluation has been included.

Product information

Product names

  • SWG ASSY® 3.0 Self-Tapping Wood Screws
  • SWG ASSY® VG Plus

Product description

The products are self-tapping screws (STS) that are available in many combinations of diameters, lengths, head types, thread types (single, double or coarse threads), and as partial-thread screws or full-thread screws. This evaluation covers the following 5 specific designations of proprietary SWG ASSY® Self-Tapping Wood Screws made from carbon steel (see section Self-Tapping Screws - Specification Summary for a summary of the screw specifications):

  1. three (3) partial-thread screws with self-tapping tip: SWG ASSY® 3.0 SK, SWG ASSY® 3.0 Kombi, SWG ASSY® 3.0 Ecofast, and
  2. two (2) full-thread screws with self-drilling tip: SWG ASSY® VG plus CYL (cylinder head), SWG ASSY® VG plus CSK (countersunk head).

The SWG ASSY® 3.0 Self-Tapping Wood Screws are self-tapping while the SWG ASSY® VG plus ones have a self-drilling tip, which is also self-tapping. The partial-thread screws have a coarse thread while the full-thread screws have a single thread. Additional specifications and detailed information are available from the manufacturer’s Design Guide outlined below.

Installation description

General note: The use of the term "embedment depth" throughout this Evaluation Report is equivalent to "penetration length" of the self-tapping screw into the wood member.

Angle of installation

The products have been evaluated for installation at 3 angles in relation to the timber members being fastened together: 30°, 45° and 90°.

Spacing

The screw spacings outlined below originate from the European approval for SWG ASSY® Self-Tapping Wood Screws and the German standard DIN 1052.

Installation practice

For a successful installation, all aspects of the manufacturer’s screw installation instructions must be followed, including requirements for the drill bit, drill specification, torque, screw guide for angle installations, steel plate details, etc.

Manufacturing plant

This evaluation is valid only for products produced at the following plant:

Product namesManufacturing plant
Waldenburg, Germany
SWG ASSY® 3.0 Self-Tapping Wood ScrewsProduct evaluated by the CCMC
SWG ASSY® VG PlusProduct evaluated by the CCMC

Product evaluated by the CCMC Indicates that the product from this manufacturing facility has been evaluated by the CCMC

  Conditions and limitations

The CCMC’s compliance opinion is bound by this product being used in accordance with the conditions and limitations set out below.

The products are self-tapping wood screws for structural wood connections fabricated with dry lumber, intended to be used as fasteners for structural lumber connections for dry service use Footnote (1) applications only.

The following list of conditions and limitations apply to this product evaluation:

  • The structural wood design, with proprietary fastener design values herein, is to be in accordance with CSA O86-14 performed by a professional engineer, with an expertise in wood design, licensed to practice within the Provincial/Territorial jurisdiction.
  • The published resistances are limited to Canadian wood species/densities and proprietary structural composite lumber (SCL) tested and outlined below.
  • For the withdrawal applications:
    • The lumber side plate member, being connected to the main member, must have a minimum thickness of 4d (where d is the thread outer diameter). At the admissible installation angles of 30° to 90° (angle from the horizontal (parallel to grain)), the following exceptions apply:
      1. for the screw diameters ≥ 10 mm and installation angles other than 90° (i.e., perpendicular to grain) the minimum wood member thickness (side and main) is 8d;
      2. for the screw diameters = 12 mm and installation angles other than 90° (i.e., perpendicular to grain) the minimum wood member thickness (side and main) is 10d.
    • The withdrawal resistance has an upper limit set by the tensile capacity of the screws and must not be exceeded. See table "Strength of SWG ASSY® screws made from carbon steel" below for the prescribed tensile capacities and limiting factored tensile values for the 6-mm, 8-mm, 10-mm and 12-mm screws. (The section Application Cases Permitted outlines permitted application cases in tabular form.)
  • For lateral load resistance, the minimum wood side and main member thickness for the self-tapping screws shall be 50 mm for d < 10 mm and 100 mm for d ≥ 10 mm in order to avoid mode 1 and mode 2 failures in wood so that a ductile steel yielding mode can be achieved.
  • This evaluation does not apply to connections with other materials (i.e., panel products).
  • The screw angles, spacings, end/edge distances and end-grain (at angle) installations must follow the prescribed requirements and the manufacturer’s recommendations.
  • The Service Condition Factor for lag screws applies to these self-tapping screws and is limited to the connections fabricated with seasoned lumber and used in dry service.
  • Surface coated screws are not evaluated for applications where corrosion resistance is required, and can't be used in preservative treated wood.
  • Other limitations are applicable as outlined below for specific applications.

The installation of the products must be in accordance with the manufacturer’s details found in the “Design Guide for ASSY® Screws in Canada,” Version 1, October 2013.

The manufacturer, SWG/Würth, provides engineering and technical support through My-Ti-Con Ltd. in conjunction with the “Design Guide for ASSY® Screws in Canada” and offers the following contact number:

  • MY-TI-CON: 866-899-4090 or info@my-ti-con.com

  Technical information

This evaluation is based on demonstrated conformance with the following criteria:

Evaluation requirements
Criteria number Criteria name
CCMC-TG-060523.14-15CCMC Technical Guide for Wood Screws – Self Tapping

 

The Report Holder has submitted technical documentation for the CCMC’s evaluation. Testing was conducted at laboratories recognized by the CCMC. The corresponding technical evidence for this product is summarized below.

Material requirements

The CCMC’s Technical Guide for self-tapping wood screws sets out the nature of the technical evidence required by the CCMC to enable it to evaluate a product as an acceptable or alternative solution in compliance with the NBC 2015. The Report Holder has submitted test results for the CCMC’s evaluation. Testing was conducted by an independent testing agency recognized by the CCMC. The corresponding results of the tests conducted for the products are summarized in the section Summary of Testing and Design Value Derivation.

Characteristic densities

The products’ qualification test program and pre-engineered tables in the following sections of this Report are based on the following species and respective oven-dry relative densities.

Table 1. Oven-dry relative densities of timber species
Timber densities
Visually graded lumber Glue-laminated timber Mean oven-dry relative density
D fir-L D fir-L 0.49
S-P-F 0.42
S-P-F 0.44
Hem-fir Hem-fir 0.46
Northern 0.35
S-Y-P 0.55
Structural composite lumber (SCL) density
Parallam® (PSL) 0.50

Characteristic screw fastener dimensions and strengths

Dimensions

The detailed dimensions and thread lengths of the STS are outlined in the section Detailed Screw Dimensions.

Note

Self-tapping screws have an “outside” screw diameter that exceeds the shank diameter. In conventional lag screws, the outside screw diameter is typically equal to or less than the shank diameter, unless the lag screw is a “reduced body diameter” lag screw, in which case the shank diameter is also less than the outside screw diameter.

Table 2. Strength of "SWG ASSY®" screws made from carbon steel
Partial- (PT) or full-thread (FT) “SWG ASSY®” type STS Outside thread diameter (mm) Root diameterTable footnote (1) (dmin, mm) Bending yield strengthTable footnote (2) (MPa) Screw tension strength (kN) Unfactored screw shear strengthTable footnote (2) (MPa)
Unfactored resistance Factored resistanceTable footnote (2)
FT

VG CYL

 

 

6

3.8

 

969

 

11.3

 

9.04

 

578

PT

SK,

Ecofast

3.9
FT

VG CYL,

VG CSK

 

8

5

 

1015

 

18.9

 

15.12

 

641

PT

SK, Ecofast,

Kombi

5.3
FT

VG CYL,

VG CSK

 

10

6.2

 

942

 

24

 

19.2

 

691

PT

SK, Ecofast,

Kombi

5.3
FT

VG CSK

 

 

12

7.1

 

1147

 

30

 

24

 

536

PT

SK,

Kombi

7.2

 

Spacing of "SWG ASSY®" screws in timber

The minimum spacing, end and edge distances of the products loaded laterally (i.e., shear) or axially (i.e., withdrawal) in timber must follow the principles of the German standards DIN 1052 and Dibt ETA-11/0190. The screw spacing and end/edge distances are summarized in Figure 1 and the "Minimum spacing, end and edge distances for the SWG ASSY®" tables below for information only; the designer must consult the manufacturer’s Design Guide for accuracy and additional information.

Minimum spacing, end and edge distances Footnote (1) for the SWG ASSY® self-tapping wood screws – screw types (d = outside diameter) screws loaded laterally

Minimum spacing or distance Partial-thread self-tapping
SWG ASSY® 3.0 SK, Kombi, Ecofast
Relative density ≤ 0.42 0.42 < relative density ≤ 0.50 kg/m3
Spacing parallel to grain (SP) 12d 15d (22.5d in D-fir)
Spacing perpendicular to grain (SQ) 5d 7d
Loaded end distance (aL) 15d 20d (30d in D-fir)
Unloaded end distance (a) 10d 15d (22.5d in D-fir)
Loaded edge distance (eL) 10d 12d
Unloaded edge distance (e) 5d 7d

 

Minimum spacing, end and edge distances Footnote (1) for the SWG ASSY® self-tapping wood screws – screw types (d = outside diameter) screws loaded laterally

Minimum spacing or distance Full-thread self-drilling + self-tapping
SWG ASSY® VG plus CYL, SWG ASSY® VG plus CSK
Relative density ≤ 0.50 kg/m3
Spacing parallel to grain (SP) 5d (7.5d in D-fir)
Spacing perpendicular to grain (SQ) 3d
Loaded end distance (aL) 12d (18d in D-fir)
Unloaded end distance (a) 7d (10.5d in D-fir)
Loaded edge distance (eL) 7d
Unloaded edge distance (e) 3d

 

Minimum spacing, end and edge distancesFootnote (1) for the SWG ASSY® self-tapping wood screws – screw Types (d = outside diameter) screws loaded axially

Minimum spacing or distance Full-thread self-drilling + self-tapping
SWG ASSY® VG plus CYL, SWG ASSY® VG plus CSK
Spacing parallel to grain (SP) 5d (7.5d in D-fir)
Spacing perpendicular to grain (SQ) 2.5d
Loaded end distance (aL) 5d (7.5d in D-fir)
Unloaded end distance (a)
Loaded edge distance (eL) 3d
Unloaded edge distance (e)

 

Drawing demonstrating the spacing, end/edge distances of the product when loaded laterally or axially.
Figure 1. Spacings, end/edge distances – see manufacturer’s Design Guide for more detailed information
  • e = unloaded edge distance
  • SQ = spacing perpendicular to grain
  • SP = spacing parallel to grain
  • aL = loaded end distance
  • eL = loaded edge distance
  • a = unloaded end distance
  • t = thickness of member

Performance requirements

Head pull-through resistance of SWG ASSY® screws in timber

The head pull-through resistance, RPT, in the equation below is based on the characteristic value from testing and adjusted for standard term loading.

R PT = Ø ( r PT · K d · K SF )

where:

Ø = 0.7
rPT = characteristic pull-through strength, adjusted to Standard Term (kN)
Kd = 1.0 for standard term loading
KSF = 1.0 for dry service

Head pull-through resistance Footnote (1) Footnote (2)  for partial-thread Footnote (3) SWG ASSY® 3.0 STS screws – SK (kN) 
Diameter (mm) Mean oven-dry relative density (kg/m3) SK
Unfactored Factored, Ø = 0.7
6 0.35 3.84 2.69
0.42 3.72 2.61
0.49 5.78 4.04
0.50 6.35 4.44
0.55 3.96 2.77
8 0.35 4.12 2.88
0.42 7.50 5.25
0.49 9.80 6.86
0.50 9.69 6.78
0.55 6.55 4.59
10 0.35 6.67 4.67
0.42 8.58 6.01
0.49 8.67 6.07
0.50 10.41 7.29
0.55 8.31 5.82
12 0.35 6.81 4.77
0.42 9.18 6.42
0.49 11.63 8.14
0.50 14.28 10.0
0.55 8.43 5.90

 

Head pull-through resistanceFootnote (1) Footnote (2) for partial-thread Footnote (3) SWG ASSY® 3.0 STS screws – Kombi (kN)

Diameter (mm) Mean oven-dry relative density (kg/m3) Kombi
Unfactored Factored, Ø = 0.7
6 0.35
0.42
0.49
0.50
0.55
8 0.35 1.88 1.31
0.42 2.48 1.74
0.49 3.74 2.62
0.50 4.22 2.95
0.55 3.26 2.28
10 0.35 2.60 1.82
0.42 3.78 2.65
0.49 5.23 3.66
0.50 5.08 3.56
0.55 3.86 2.70
12 0.35 3.33 2.33
0.42 4.01 2.81
0.49 5.23 3.66
0.50 6.29 4.40
0.55 5.23 3.66

 

Head pull-through resistanceFootnote (1) Footnote (2) for partial-thread Footnote (3) SWG ASSY® 3.0 STS screws – Ecofast (kN)

Diameter (mm) Mean oven-dry relative density (kg/m3) Ecofast
Unfactored Factored, Ø = 0.7
6 0.35 1.64 1.15
0.42 1.89 1.32
0.49 3.65 2.56
0.50 3.10 2.17
0.55 2.81 1.97
8 0.35 2.14 1.50
0.42 3.07 2.15
0.49 3.85 2.69
0.50 4.80 3.36
0.55 4.76 3.33
10 0.35 2.70 1.89
0.42 3.87 2.71
0.49 6.61 4.63
0.50 5.69 3.99
0.55 4.43 3.10
12 0.35
0.42
0.49
0.50
0.55

Withdrawal resistance of SWG ASSY® screws in timber

Design tables

A pre-calculated screw withdrawal resistance table is presented in Appendix D. The table presents the withdrawal resistance for a 20-mm-per-unit thread embedment depth for the specific angle, density and screw diameter. The pre-calculated values have been provided by the manufacturer in accordance with the design equation below. The equation has been validated following a reliability analysis as per principles of CSA O86 (see section Summary of Testing and Design Value Derivation on reliability study). These tables are presented in the section Factored Withdrawal Resistances for information purposes only. The designer must consult the manufacturer’s official tables for design.

Note: The tables have been prepared with a load duration value of Kd = 1.0. Resistance values may be adjusted for other load durations.

Withdrawal resistance equation

The factored withdrawal resistance, Prw,α , for installation angle (α), must be determined using the following equation Footnote (1) :

P rw,α = φ 0.8 · δ( b · 0.84 · ρ) 2 · d · l ef · 10 -6 sin 2 α + 4 3 · co̅s 2 α · K D · K SF      (N)

where:

φ = 0.9
0.8 = adjustment to standard term loading
δ = material adjustment factor: 82 for ρ ≥ 440 kg/m3; 85 for ρ < 440 kg/m3
b = 1 for D-fir-L, SPF, SYP, WRC, Hem-fir

or

b = 0.75 for Parallam (PSL)
ρ = mean oven-dry relative density (CSA O86, Table A.10.1.) x 103 (kg/m3)
0.84 = adjustment of mean oven-dry relative density to fifth percentile value d = outside screw diameter (mm)
lef = embedment depth into member (thread length-tip length (= d)) (mm)
α = screw angle
KD = load duration factor = 1.0
KSF = service condition factor = 1.0

Lateral resistance of SWG ASSY® screws in timber

Lateral resistance

The factored lateral resistance must be calculated in accordance with CSA O86-14, “Engineering Design in Wood,” Clause 12.6.6 for lag screws using shank diameter for partially threaded screws and root diameter for fully threaded screws. In addition, for lateral load resistance, the minimum wood side and main member thickness for the self-tapping screws shall be 50 mm for d < 10 mm and 100 mm for d ≥ 10 mm in order to avoid mode 1 and mode 2 failures in wood so that a ductile steel yielding mode can be achieved.

Self-tapping screws – specification summary

Table 3. Self tapping screws - specification summary for Partial Thread STS - SWG® 3.0 series
Name Head type Outside diameter (ø) (mm) Screw length varies by (ø) (mm) Thread length Thread type Shank cutter
SWG ASSY 3.0 SK Table footnote (1) Large washer head 6, 8, 10, 12 60-1000 Varies
  • coarse thread
  • self-tapping tip (e.g. 8-mm ø)

see Figure 3. for detail drawing Table footnote (2)

Yes
SWG ASSY 3.0 Kombi Table footnote (3) Hex head 8, 10, 12 60-600 Varies
  • coarse thread
  • self-tapping tip (e.g. 10-mm ø)

see Figure 5. for detail drawing Table footnote (4)

Yes
SWG ASSY 3.0 Ecofast Table footnote (5) Countersunk head 6, 8, 10 60-400 Varies
  • coarse thread
  • self-tapping tip (e.g. 6-mm ø)

see Figure 7. for detail drawing Table footnote (6)

Yes

 

Table 4. Self-tapping screws - specification summary for Full-Thread STS - ASSY
Name Head type Outside diameter () (mm) Screw length varies by () (mm) Thread length Thread type Shank cutter
SWG ASSY VG plus CYL Table footnote (1) Cylindrical head 6, 8, 10 70-800 Full thread
  • single thread
  • self-drilling tip (e.g. 6-mm ø)
see Figure 9. for detail drawing Table footnote (2)
N/A
SWG ASSY VG plus CSK Table footnote (3) Countersunk head 8, 10, 12 80-800 Full thread
  • single thread
  • self-drilling tip (e.g. 8-mm ø)
see Figure 11. for detail drawing Table footnote (4)
N/A

Summary of testing and design value derivation

Test Information - Partial (coarse) thread vs Full (single) thread
Property Test information
Thread type - Withdrawal resistance

Testing was done to compare the withdrawal resistance of the 6-mm- and 10-mm-diameter full thread vs. partial-thread screws which differ in thread pitch. Twenty-eight (28) statistical samples were tested in two species of wood: DF and western red cedar. The screws have similar withdrawal resistance with the partially threaded screws having slightly higher values. The test program below was conducted on the full-thread screws and design values are considered applicable to the partial thread screws.

 

Full thread - ASSY® VG plus CYL (cylinder head), ASSY® VG plus CSK (countersunk head) – fastener metal tests
Property Test information
Bending yield strength Ten (10) screws, each of four diameters, were tested (6 mm, 8 mm, 10 mm, 12 mm) in bending. The published bending yield strength is the minimum of: (i) the bending yield stress from the moment/section modulus, and (ii) the average of the sum of the yield strength and ultimate strength (dowel/bolt yield strength, CSA O86, Article 10.4.4.3.3.3.(b))
Tension Steel tensile values were made available by the manufacturer and withdrawal tests that failed in tension formed the data set. The manufacturer’s minimum ultimate tensile stress governs. The factored tensile stress is multiplied with Φ= 0.8 from CSA S16 for steel.
Shear Ten (10) screws, each of four diameters, were tested (6 mm, 8 mm, 10 mm, 12 mm) in accordance with AISI-TS-4-02. The unfactored shear stress is the characteristic ultimate screw shear stress value (i.e. fifth percentile, 75% confidence).

 

Full thread - ASSY® VG plus CYL (cylinder head), ASSY® VG plus CSK (countersunk head) – screw resistances
Property Test information
Withdrawal resistance

Twenty-eight (28) screws of each combination were tested: four screw diameters (d) were tested (d= 6 mm, 8 mm, 10 mm, 12 mm), four embedment depths (4d, 8d, 12d, 16d), five wood species (DF, SP glulam, western red cedar, SYP and Parallam (PSL)), and three angles to the grain (90°, 45° and 30°), for a total of 5880 withdrawal tests.

The data was used to verify and validate the two European equations for self-tapping screws installed at an angle. The Eurocode 5 (Equation 2) and the DIN 1052:2008-12 (Equation 1) were compared w.r.t. establishing the characteristic withdrawal value. The DIN equation was the most precise with a nonconformance of only 0.3%. The equation was further adjusted for duration of load and is presented in Section "Withdrawal resistance of SWG ASSY® screws in timber" above.

Pull-through resistance Twenty-eight (28) of each combination were tested: four screw diameters (d = 6 mm, 8 mm, 10 mm, 12 mm), three types of heads (countersunk, washer and hex), and two types of thread, for a total of 1680 screw head pull-through tests.
Lateral resistance As per CSA O86-14, Section 12.6.6 for lag screw design using shank diameter for partially-threaded screws and root diameter for fully-threaded screws.
Reliability: Withdrawal resistance

In addition to the extensive database, a random process model was developed to represent stochastic withdrawal resistance considering the wood substrate, installation angles, embedment depths and screw diameters.

A formal reliability analysis was conducted using the “First Order Second Moment Method.” Two modes of failure were considered: screw withdrawal and screw breakage. A performance factor of 0.9 was confirmed for an average beta of ≥ 3.47 with a minimum greater than 2.5. The lower bound beta was consistent with the performance level of dimension lumber having a minimum beta = 2.5.

Reliability: Pull- through resistance

In addition to the extensive database, a random process model was developed for simulation of the pull-through resistance considering the variety of wood densities and screw properties.

A formal reliability analysis was conducted using the “First Order Second Moment Method.” For the head pull-through resistance with a performance factor of 0.7, the average beta was ≥ 3.41 with a minimum greater than 3.1. This reliability level is consistent with the safety level for combined screw pull-through resistance and screw breakage failure.

Spacing The recommended screw spacings have been adopted from the latest DIN standard published in Germany with proprietary spacings specified for ASSY screws in their product evaluation, Dibt ETA-11/0190.

 

Detailed screw dimensions

Table 5. SWG ASSY® Kombi – metric specsTable footnote footnote (1)Table footnote footnote (2)
d L (mm) Lthread (mm) Ltip (mm) Table footnote footnote (3) dhead (mm) dmin (mm) ds (mm) da (mm) dshd (mm) th (mm) ts (mm) Bit
8 60 40 8 12 5.3 5.8 9 7.8 4.5 3.5 AW 40 or 12 mm socket
80 50
100 60
120 to 200 in 20 mm increments 80
220 to 300 in 20 mm increments 100
10 140 80 10 15 6.3 7.2 11 9.8 5 3.75 AW 40 or 15 mm socket
160 to 300 in 20 mm increments 100
320 to 400 in 20 mm increments 120
440 to 520 in 40 mm increments 120
12 100 60 12 17 7.2 8.2 13 11.8 5.5 4 AW 40 or 17 mm socket
120 80
140 80
160 to 200 in 20 mm increments 100
220 to 360 in 20 mm increments 120
380 to 600 in 20 mm increments 145

 

Table 6. SWG ASSY® Ecofast – metric specs Table footnote footnote (1)Table footnote footnote (2)
d L (mm) Lthread (mm) Ltip (mm) Table footnote footnote (3) dhead (mm) dmin (mm) ds (mm) da (mm) th (min) dp (mm) Bit
6 60 37 6 12 4 4.4 7 4.2 14.5 AW 30
70 42
80 50
90 50
100 60
120 to 300 in 20 mm increments 70
8 60 50 8 14.7 5 5.8 9 4.6 19 AW 40
80 50
90 60
100 60
120 to 200 in 20 mm increments 80
220 to 400 in 20 mm increments 100
10 80 50 10 18 6.3 7.2 11 5.5 23 AW 50
100 60
120 to 140 80
160 to 300 in 20 mm increments 100
320 to 400 in 20 mm increments 120

 

Table 7. SWG ASSY® SK – metric specsTable footnote footnote (1)Table footnote footnote (2)
d L (mm) Lthread (mm) Ltip (mm)Table footnote footnote (3) dhead (mm) dmin (mm) dmin (mm) ds (mm) dp (mm) t(mm) Bit
6 60 37 6 14 3.9 4.4 8 1.2 3 AW 30
70 42
80 50
80 50
100 60
100 to 300 in 20 mm increments 70
8 60 50 8 22 5.3 5.8 10 1.8 3.8 AW 40
80 50
100 60
120 to 200 in 20 mm increments 80
320 to 460 in 20 mm increments 100
10 140 80 10 25 6.3 7.2 13.5 2.2 4.6 AW 50
160 to 480 in 20 mm increments 100
320 to 460 in 20 mm increments 120
12 200 100 12 29 7.2 8.2 14 2.6 5 AW 60
220 to 340 in 20 mm increments 120
380 to 520 in 40 mm increments 145
900 120
1000 120

 

Table 8. SWG ASSY® VG plus CYL – metric specs Table footnote footnote (1)Table footnote footnote (2)
d L (mm) Lthread (mm) Ltip (mm) Table footnote footnote (3) dhead (mm) dmin (mm) th(mm) Bit
6 80 73 6 8 3.8 4.7 AW 30
100 93
120 113
140 133
160 153
180 173
200 193
8 160 144 8 10 5 7.5 AW 40
180 164
200 184
220 204
240 224
260 244
280 264
300 284
330 311
360 344
380 364
430 414
480 464
530 514
580 564
10 120 105 10 13.4 6.2 8 AW 50
140 125
160 145
180 165
200 185
220 205
240 225
260 245
280 265
300 280
320 305
340 325
360 345
380 365
400 380
430 415
480 456
530 506
580 556
650 626
700 680
750 726
800 780

 

Table 9. SWG ASSY® VG plus CSK – metric specs Table footnote footnote (1)Table footnote footnote (2)
d L (mm) Lthread (mm) Ltip (mm) Table footnote footnote (3) dhead (mm) dmin (mm) da (mm) th (mm) dp (mm) Bit
8 80 61 8 14.8 5 9 4.6 19 AW 40
120 103
140 123
160 143
180 163
200 183
220 203
240 223
260 243
280 263
300 283
10 100 77 10 19.6 6.2 11 6.5 24 AW 50
140 125
160 145
180 165
200 185
220 205
240 225
260 245
280 265
300 280
320 305
340 325
360 345
380 365
400 385
430 415
480 465
530 512
580 562
650 632
700 682
750 732
800 782
12 120 105 12 22.1 7.1 13 6.7 26 AW 50
140 125
160 145
180 165
200 185
220 205
240 225
260 245
280 265
300 285
380 365
480 465
600 585

Factored withdrawal resistances

Table 10. Factored withdrawal resistance per 20-mm thread embedment depthTable footnote footnote (1)
Factored withdrawal resistance Prw,∝ per 20 mm (¾ in.) of thread penetration Factored tensile resistance in kN
∝ (°) d (mm) ρ = 0.35 ρ = 0.42 ρ = 0.44 ρ = 0.46 ρ = 0.49 ρ = 0.5 PSL ρ = 0.55
90 6 0.63 0.91 0.97 1.06 1.20 0.70 1.51 9.04
8 0.85 1.22 1.29 1.41 1.60 0.94 2.02 15.12
10 1.06 1.52 1.61 1.76 2.00 1.17 2.52 19.2
12 1.27 1.83 1.94 2.12 2.40 1.41 3.02 24
45 6 0.54 0.78 0.83 0.91 1.03 0.60 1.30 9.04
8 0.73 1.04 1.11 1.21 1.37 0.80 1.73 15.12
10 0.91 1.31 1.38 1.51 1.71 1.00 2.16 19.2
12 1.09 1.57 1.66 1.81 2.06 1.21 2.59 24
30 6 0.51 0.73 0.77 0.85 0.96 0.56 1.21 9.04
8 0.68 0.98 1.03 1.13 1.28 0.75 1.61 15.12
10 0.85 1.22 1.29 1.41 1.60 0.94 2.02 19.2
12 1.02 1.46 1.55 1.69 1.92 1.12 2.42 24

 

Drawing showing factored withdrawal resistance specifying dimensions, wood grain dimensions and details per each type of screw.
Figure 17. Factored withdrawal resistance
  1. Wood grain direction
  2. ASSY VG CYL 8 × 300
  3. ASSY SK 8 × 300
  4. ASSY ECO 8 × 300
  5. ASSY KOMBI 8 × 300
  6. ASSY VG CYL 8 × 300
  7. ASSY VG CS 8 × 300

Application cases permitted

List of permitted application cases – douglas-fir (DF)
Screw diameter (mm) Installation angle (°) Effective embedment depth (mm)
4d 8d 12d 16d
6 90 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 allowed allowed allowed allowed
12 allowed allowed allowed allowed
6 45 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed
6 30 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed

 

List of permitted application cases – spruce pine (SP)
Screw diameter (mm) Installation angle (°) Effective embedment depth (mm)
4d 8d 12d 16d
6 90 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 allowed allowed allowed allowed
12 allowed allowed allowed allowed
6 45 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed
6 30 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed

 

List of permitted application cases – parallel strand lumber (PSL)
Screw diameter Installation angle (°) Effective embedment depth (mm)
4d 8d 12d 16d
6 90 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 allowed allowed allowed allowed
12 allowed allowed allowed allowed
6 45 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed
6 30 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed

 

List of permitted application cases – western red cedar (WRC)
Screw diameter (mm) Installation angle (°) Effective embedment depth (mm)
4d 8d 12d 16d
6 90 allowed allowed allowed allowed
allowed allowed allowed allowed
10 allowed allowed allowed allowed
12 allowed allowed allowed allowed
6 45 allowed allowed allowed allowed
allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed
6 30 allowed allowed allowed allowed
allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed

 

List of permitted application cases – southern yellow pine (SYP)
Screw diameter (mm) Installation angle (°) Effective embedment depth (mm)
4d 8d 12d 16d
6 90 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 allowed allowed allowed allowed
12 allowed allowed allowed allowed
6 45 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed
6 30 allowed allowed allowed allowed
8 allowed allowed allowed allowed
10 not allowed allowed allowed allowed
12 not allowed not allowed allowed allowed

Administrative information

Use of Canadian Construction Materials Centre (CCMC) assessments

This assessment must be read in the context of the entire CCMC Registry of Product Assessments, any applicable building code or by-law requirements, and/or any other regulatory requirements (for example, the Canada Consumer Product Safety Act, the Canadian Environmental Protection Act, etc.).

It is the responsibility of the user to confirm that the assessment they are using is current and has not been withdrawn or superseded by a later version on the CCMC Registry of Product Assessments.

Disclaimer

The National Research Council of Canada (NRC) has evaluated only the characteristics of the specific product described herein. The information and opinions in this evaluation are directed to those who have the appropriate degree of experience to use and apply its contents (such as authorities having jurisdiction, design professionals and specifiers). This evaluation is valid when the product is used as part of permitted construction, respecting all conditions and limitations stated in the evaluation, and in accordance with applicable building codes and by-laws.

This evaluation is provided without representation, warranty or guarantee of any kind, expressed or implied, and the NRC provides no endorsement for any evaluated product. The NRC accepts no responsibility whatsoever arising in any way from any and all use of or reliance on the information contained herein or the use of any evaluated product. The NRC is not undertaking to render professional or other services on behalf of any person or entity nor to perform any duty owed by any person or entity to another person or entity.

Language

Une version française de ce document est disponible.
In the case of any discrepancy between the English and French version of this document, the English version shall prevail.

Copyright

© His Majesty the King in Right of Canada, as represented by the National Research Council of Canada, 2024

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the CCMC.

Page details

From: National Research Council Canada

Date modified: