Selection Tables

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5/8″ Bolt or dowel
Double Shear, 6mm steel internal plate to D. Fir-L lumber
Wood Member Fastener
Thickness
(mm) 		Depth
(mm) 		No.
of
rows 		No. of fasteners in a row
2 3
Bolt spacing in a row taken as the minimum of the loaded end distance4, aL, and the spacing between bolts in a row, SR (mm)
64 95 127 159 190 64 95 127 159 190
89 140 1 0 10.4(R) 15.6(R) 20.8(R) 26.0(R) 31.2(R) 15.6(R) 23.4(R) 31.2(R) 39.0(R) 46.8(R)
89 235 2 47.625 20.0(G) 25.2(G) 30.4(G) 35.6(G) 40.8(G) 25.2(G) 33.0(G) 40.8(G) 48.6(G) 56.4(G)
89 235 2 79.375 20.8(R) 31.2(R) 40.5(G) 45.7(G) 51.0(G) 31.2(R) 43.1(G) 51.0(G) 58.8(G) 66.6(G)
89 235 2 111.125 20.8(R) 31.2(R) 41.6(R) 52.0(R) 61.1(G) 31.2(R) 46.8(R) 61.1(G) 68.9(G) 76.7(G)
140 140 1 0 13.5(R) 20.3(R) 27.0(R) 33.8(R) 39.7(d) 20.3(R) 30.4(R) 40.6(R) 50.7(R) 59.6(d)
140 191 2 47.625 23.8(G) 30.6(G) 37.3(G) 44.1(G) 50.9(G) 30.6(G) 40.7(G) 50.9(G) 61.0(G) 71.1(G)
140 191 2 79.375 27.0(R) 40.6(R) 48.3(G) 55.1(G) 61.8(G) 40.6(R) 51.7(G) 61.8(G) 72.0(G) 82.1(G)
140 241 2 111.125 27.0(R) 40.6(R) 54.1(R) 61.8(G) 68.6(G) 40.6(R) 58.4(G) 68.6(G) 78.7(G) 87.2(T)
140 292 3 47.625 31.4(G) 38.2(G) 44.9(G) 51.7(G) 58.4(G) 38.2(G) 48.3(G) 58.4(G) 68.6(G) 78.7(G)
140 292 3 62.5 40.3(G) 47.1(G) 53.8(G) 60.6(G) 67.4(G) 47.1(G) 57.2(G) 67.4(G) 77.5(G) 87.6(G)
191 140 1 0 18.8(R) 28.2(R) 37.7(R) 45.0(d) 45.0(d) 28.2(R) 42.4(R) 56.5(R) 67.6(d) 67.6(d)
191 191 2 47.625 33.1(G) 42.6(G) 52.0(G) 61.4(G) 70.8(G) 42.6(G) 56.7(G) 70.8(G) 84.9(G) 99.0(G)
191 191 2 79.375 37.7(R) 56.5(R) 67.3(G) 76.7(G) 86.1(G) 56.5(R) 72.0(G) 86.1(G) 100(G) 114(G)
191 241 2 111.125 37.7(R) 56.5(R) 75.3(R) 90.1(d) 90.1(d) 56.5(R) 84.7(R) 101(G) 115(G) 130(G)
191 292 3 47.625 43.7(G) 53.1(G) 62.5(G) 71.9(G) 81.4(G) 53.1(G) 67.2(G) 81.4(G) 95.5(G) 110(G)
191 292 3 62.5 56.1(G) 65.6(G) 75.0(G) 84.4(G) 93.8(G) 65.6(G) 79.7(G) 93.8(G) 108(G) 122(G)
241 140 1 0 24.0(R) 36.0(R) 48.1(R) 50.3(d) 50.3(d) 36.0(R) 54.1(R) 72.1(R) 75.4(d) 75.4(d)
241 191 2 47.625 42.3(G) 54.3(G) 66.3(G) 78.3(G) 90.4(G) 54.3(G) 72.3(G) 90.4(G) 108(G) 126(G)
241 191 2 79.375 48.1(R) 72.1(R) 85.8(G) 97.9(G) 101(d) 72.1(R) 91.9(G) 110(G) 128(G) 135(T)
241 241 2 111.125 48.1(R) 72.1(R) 96.1(R) 101(d) 101(d) 72.1(R) 108(R) 129(G) 147(G) 151(d)
241 292 3 47.625 60.6(G) 72.6(G) 84.6(G) 96.6(G) 109(G) 72.6(G) 90.6(G) 109(G) 127(G) 145(G)
241 292 3 62.5 72.1(R) 90.9(G) 103(G) 115(G) 127(G) 90.9(G) 109(G) 127(G) 145(G) 163(G)
292 140 1 0 29.3(R) 44.0(R) 52.2(g) 52.2(g) 52.2(g) 44.0(R) 66.0(R) 78.3(g) 78.3(g) 78.3(g)
292 191 2 47.625 48.7(G) 63.4(G) 78.0(G) 92.7(G) 104(g) 63.4(G) 85.4(G) 107(G) 129(G) 130(T)
292 191 2 79.375 58.7(R) 84.1(G) 98.7(G) 104(g) 104(g) 84.1(G) 106(G) 128(G) 130(T) 130(T)
292 241 2 111.125 58.7(R) 88.0(R) 104(g) 104(g) 104(g) 88.0(R) 132(R) 157(g) 157(g) 157(g)
292 241 3 47.625 74.0(G) 88.6(G) 103(G) 118(G) 133(G) 88.6(G) 111(G) 133(G) 155(G) 177(G)
292 241 3 62.5 88.0(R) 111(G) 126(G) 140(G) 155(G) 111(G) 133(G) 155(G) 177(G) 181(T)

Notes:

  1. The tabulated values are the minimum of the yielding resistance, row shear, group tear-out and net tension resistances of the wood member, 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 in the main member.
  3. The tabulated lateral resistances are based on removing a 10 mm thick slot to accommodate the 6 mm internal steel plate.
  4. The minimum loaded end distance, aL, is the maximum of 50 mm and 5 times the fastener diameter (O86 Clause 12.4.3.1).
  5. 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.
  6. 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),
    • Pr = P'r for yielding failure mode (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.

  7. 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).
  8. Tabulated values are based on ASTM A307 grade steel bolts or dowels, and ASTM A36/A36M grade steel plate. The resistance of steel plate needs to be checked separately.
  9. A single steel splice plate is not permitted to be used for multiple rows of bolts or dowels when the distance between the two outer rows exceeds 125 mm.
  10. N/A = not applicable.
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