Selection Tables

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1″ Bolt or dowel
Double Shear, D. Fir-L lumber
Wood Member Fastener
Thickness
(mm) 		Depth
(mm) 		No.
of
rows 		No. of fasteners in a row
2 3
Side,
t₁ 		Main,
t₂ 		Side,
d₁ 		Main,
d₂ 		102 152 203 254 305 102 152 203 254 305
38 38 140 140 1 0 12.3(R) 18.5(R) 24.6(R) 28.2(c) 28.2(c) 18.5(R) 27.7(R) 29.0(T) 29.0(T) 29.0(T)
38 38 235 235 2 76 19.9(G) 26.0(G) 32.2(G) 38.3(G) 39.3(T) 26.0(G) 35.3(G) 39.3(T) 39.3(T) 39.3(T)
38 38 286 286 2 127 24.6(R) 33.9(G) 40.0(G) 45.9(T) 45.9(T) 33.9(G) 43.1(G) 45.9(T) 45.9(T) 45.9(T)
38 89 140 140 1 0 16.0(R) 24.0(R) 32.0(R) 40.1(R) 48.1(R) 24.0(R) 36.0(R) 48.1(R) 58.1(T) 58.1(T)
38 89 235 235 2 76 31.1(G) 39.1(G) 47.1(G) 55.1(G) 63.1(G) 39.1(G) 51.1(G) 63.1(G) 75.1(G) 78.6(T)
38 89 286 286 2 127 32.0(R) 48.1(R) 62.8(G) 70.8(G) 78.8(G) 48.1(R) 66.8(G) 78.8(G) 90.8(G) 91.7(T)
38 140 140 140 1 0 16.0(R) 24.0(R) 32.0(R) 40.1(R) 48.1(R) 24.0(R) 36.0(R) 48.1(R) 58.1(T) 58.1(T)
38 140 235 241 2 76 31.1(G) 39.1(G) 47.1(G) 55.1(G) 63.1(G) 39.1(G) 51.1(G) 63.1(G) 75.1(G) 78.6(T)
38 140 286 292 2 127 32.0(R) 48.1(R) 62.8(G) 70.8(G) 78.8(G) 48.1(R) 66.8(G) 78.8(G) 90.8(G) 91.7(T)
89 89 140 140 1 0 28.9(R) 43.3(R) 57.7(R) 66.1(c) 66.1(c) 43.3(R) 64.9(R) 68.0(T) 68.0(T) 68.0(T)
89 89 235 235 2 76 46.5(G) 60.9(G) 75.4(G) 89.8(G) 92.1(T) 60.9(G) 82.6(G) 92.1(T) 92.1(T) 92.1(T)
89 89 286 286 2 127 57.7(R) 79.3(G) 93.7(G) 107(T) 107(T) 79.3(G) 101(G) 107(T) 107(T) 107(T)
89 140 140 140 1 0 35.8(R) 53.8(R) 70.1(T) 70.1(T) 70.1(T) 53.8(R) 70.1(T) 70.1(T) 70.1(T) 70.1(T)
89 140 235 241 2 76 51.6(G) 69.5(G) 85.2(T) 85.2(T) 85.2(T) 69.5(G) 85.2(T) 85.2(T) 85.2(T) 85.2(T)
89 140 286 292 2 127 68.1(G) 86.0(G) 98.6(T) 98.6(T) 98.6(T) 86.0(G) 98.6(T) 98.6(T) 98.6(T) 98.6(T)
89 191 140 140 1 0 37.5(R) 56.3(R) 71.3(d) 71.3(d) 71.3(d) 56.3(R) 84.4(R) 88.3(T) 88.3(T) 88.3(T)
89 191 235 241 2 76 72.8(G) 91.6(G) 110(G) 129(G) 134(T) 91.6(G) 120(G) 134(T) 134(T) 134(T)
89 191 286 292 2 127 75.0(R) 113(R) 135(T) 135(T) 135(T) 113(R) 135(T) 135(T) 135(T) 135(T)

Notes:

  1. The tabulated values are the minimum of yielding, row shear, group tear-out and net tension resistances, and are applicable to tension members. For compression members, the values are conservative when the governing failure mode is indicated as group tear-out or net tension since the resistance is based on yielding and row shear only.
  2. The governing failure mode for each connection configuration is denoted either by lowercase letter (a)-(g), indicating the specific yielding failure mode as per O86 Clause 12.4.4.3.2, or by uppercase letter (R), (G) or (T), indicating failure due to row shear, group tear-out or net tension, respectively.
  3. The minimum loaded end distance, aL, is the maximum of 50 mm and 5 times the fastener diameter (O86 Clause 12.4.3.1).
  4. For the calculation of group tear-out and net tension resistances, the fastener hole diameter is assumed to be 2 mm larger than the fastener diameter.
  5. The connection resistance P'r is required to be adjusted to end-use conditions using modification factors depending on the governing failure mode as follows:
    • Pr = P'r (KD KSF KT) for yielding failure mode (a) or (c),
    • Pr = P'r (KDy KSF KT) for yielding failure mode (d) or (g),
    • Pr = P'r (KD KSv KT) for row shear,
    • Pr = P'r (KD KSt KT) for group tear-out or net tension.

    Modification factors are provided in Section 7.4 of the Wood Design Manual 2020. For untreated wood members under standard-term loading and dry service conditions, the modification factors are 1.0.

  6. Tabulated values are based on No.1/ No.2 grade for dimension lumber (38 to 102 mm in smaller dimension) and No.2 grade for timbers (114 or more in smaller dimension).
  7. Tabulated values are based on ASTM A307 grade steel bolts or dowels.
  8. N/A = not applicable.
 . .