7/8″ Bolt or dowelDouble Shear, Northern lumber

Selection Tables

	7/8″ Bolt or dowel Double Shear, Northern 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	89	133	178	222	267	89	133	178	222	267
38	38	140	140	1	0	7.38(R)	11.1(R)	14.8(R)	18.4(c)	18.4(c)	11.1(R)	16.6(R)	20.6(T)	20.6(T)	20.6(T)
38	38	235	235	2	67	11.9(G)	15.6(G)	19.3(G)	23.0(G)	26.7(G)	15.6(G)	21.1(G)	26.7(G)	28.1(T)	28.1(T)
38	38	235	235	2	111	14.8(R)	20.3(G)	24.0(G)	27.7(G)	28.1(T)	20.3(G)	25.8(G)	28.1(T)	28.1(T)	28.1(T)
38	89	140	140	1	0	9.59(R)	14.4(R)	19.2(R)	24.0(R)	28.8(R)	14.4(R)	21.6(R)	28.8(R)	36.0(R)	41.2(T)
38	89	235	235	2	67	18.6(G)	23.4(G)	28.2(G)	33.0(G)	37.8(G)	23.4(G)	30.6(G)	37.8(G)	45.0(G)	52.2(G)
38	89	235	235	2	111	19.2(R)	28.8(R)	37.7(G)	42.5(G)	47.3(G)	28.8(R)	40.1(G)	47.3(G)	54.5(G)	56.1(T)
38	140	140	140	1	0	9.59(R)	14.4(R)	19.2(R)	24.0(R)	28.8(R)	14.4(R)	21.6(R)	28.8(R)	36.0(R)	41.2(T)
38	140	235	241	2	67	18.6(G)	23.4(G)	28.2(G)	33.0(G)	37.8(G)	23.4(G)	30.6(G)	37.8(G)	45.0(G)	52.2(G)
38	140	235	241	2	111	19.2(R)	28.8(R)	37.7(G)	42.5(G)	47.3(G)	28.8(R)	40.1(G)	47.3(G)	54.5(G)	56.1(T)
89	89	140	140	1	0	17.3(R)	25.9(R)	34.6(R)	43.1(c)	43.1(c)	25.9(R)	38.9(R)	48.2(T)	48.2(T)	48.2(T)
89	89	235	235	2	67	27.9(G)	36.5(G)	45.1(G)	53.8(G)	62.4(G)	36.5(G)	49.5(G)	62.4(G)	65.7(T)	65.7(T)
89	89	235	235	2	111	34.6(R)	47.6(G)	56.2(G)	64.9(G)	65.7(T)	47.6(G)	60.5(G)	65.7(T)	65.7(T)	65.7(T)
89	140	140	140	1	0	20.9(R)	31.4(R)	41.8(R)	46.9(d)	46.9(d)	31.4(R)	47.0(R)	47.4(T)	47.4(T)	47.4(T)
89	140	235	241	2	67	30.1(G)	40.5(G)	51.0(G)	58.7(T)	58.7(T)	40.5(G)	56.2(G)	58.7(T)	58.7(T)	58.7(T)
89	140	235	241	2	111	39.6(G)	50.1(G)	58.7(T)	58.7(T)	58.7(T)	50.1(G)	58.7(T)	58.7(T)	58.7(T)	58.7(T)
89	191	140	140	1	0	22.5(R)	33.7(R)	44.9(R)	46.9(d)	46.9(d)	33.7(R)	50.5(R)	59.7(T)	59.7(T)	59.7(T)
89	191	235	241	2	67	42.7(G)	54.9(G)	66.1(G)	77.3(G)	88.5(G)	54.9(G)	71.7(G)	88.5(G)	91.0(T)	91.0(T)
89	191	235	241	2	111	44.9(R)	67.4(R)	86.1(G)	91.0(T)	91.0(T)	67.4(R)	91.0(T)	91.0(T)	91.0(T)	91.0(T)

Notes: 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. 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. The minimum loaded end distance, a_L, is the maximum of 50 mm and 5 times the fastener diameter (O86 Clause 12.4.3.1). 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. 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: P_r = P'_r (K_D K_SF K_T) for yielding failure mode (a) or (c), P_r = P'_r (K_Dy K_SF K_T) for yielding failure mode (d) or (g), P_r = P'_r (K_D K_Sv K_T) for row shear, P_r = P'_r (K_D K_St K_T) 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. 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). Tabulated values are based on ASTM A307 grade steel bolts or dowels. N/A = not applicable.	.	.

7/8″ Bolt or dowel
Double Shear, Northern lumber

Wood Member

Fastener

Thickness
(mm)

Depth
(mm)

No.
of
rows

No. of fasteners in a row

Side,
t₁

Main,
t₂

Side,
d₁

Main,
d₂

133

178

222

267

133

178

222

267

140

7.38(R)

11.1(R)

14.8(R)

18.4(c)

11.1(R)

16.6(R)

20.6(T)

235

11.9(G)

15.6(G)

19.3(G)

23.0(G)

26.7(G)

15.6(G)

21.1(G)

26.7(G)

28.1(T)

235

111

14.8(R)

20.3(G)

24.0(G)

27.7(G)

28.1(T)

20.3(G)

25.8(G)

28.1(T)

140

9.59(R)

14.4(R)

19.2(R)

24.0(R)

28.8(R)

14.4(R)

21.6(R)

28.8(R)

36.0(R)

41.2(T)

235

18.6(G)

23.4(G)

28.2(G)

33.0(G)

37.8(G)

23.4(G)

30.6(G)

37.8(G)

45.0(G)

52.2(G)

235

111

19.2(R)

28.8(R)

37.7(G)

42.5(G)

47.3(G)

28.8(R)

40.1(G)

47.3(G)

54.5(G)

56.1(T)

140

9.59(R)

14.4(R)

19.2(R)

24.0(R)

28.8(R)

14.4(R)

21.6(R)

28.8(R)

36.0(R)

41.2(T)

140

235

241

18.6(G)

23.4(G)

28.2(G)

33.0(G)

37.8(G)

23.4(G)

30.6(G)

37.8(G)

45.0(G)

52.2(G)

140

235

241

111

19.2(R)

28.8(R)

37.7(G)

42.5(G)

47.3(G)

28.8(R)

40.1(G)

47.3(G)

54.5(G)

56.1(T)

140

17.3(R)

25.9(R)

34.6(R)

43.1(c)

25.9(R)

38.9(R)

48.2(T)

235

27.9(G)

36.5(G)

45.1(G)

53.8(G)

62.4(G)

36.5(G)

49.5(G)

62.4(G)

65.7(T)

235

111

34.6(R)

47.6(G)

56.2(G)

64.9(G)

65.7(T)

47.6(G)

60.5(G)

65.7(T)

140

20.9(R)

31.4(R)

41.8(R)

46.9(d)

31.4(R)

47.0(R)

47.4(T)

140

235

241

30.1(G)

40.5(G)

51.0(G)

58.7(T)

40.5(G)

56.2(G)

58.7(T)

140

235

241

111

39.6(G)

50.1(G)

58.7(T)

50.1(G)

58.7(T)

191

140

22.5(R)

33.7(R)

44.9(R)

46.9(d)

33.7(R)

50.5(R)

59.7(T)

191

235

241

42.7(G)

54.9(G)

66.1(G)

77.3(G)

88.5(G)

54.9(G)

71.7(G)

88.5(G)

91.0(T)

191

235

241

111

44.9(R)

67.4(R)

86.1(G)

91.0(T)

67.4(R)

91.0(T)

Notes:

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.
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.
The minimum loaded end distance, a_L, is the maximum of 50 mm and 5 times the fastener diameter (O86 Clause 12.4.3.1).
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.
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:
- P_r = P'_r (K_D K_SF K_T) for yielding failure mode (a) or (c),
- P_r = P'_r (K_Dy K_SF K_T) for yielding failure mode (d) or (g),
- P_r = P'_r (K_D K_Sv K_T) for row shear,
- P_r = P'_r (K_D K_St K_T) 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.
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).
Tabulated values are based on ASTM A307 grade steel bolts or dowels.
N/A = not applicable.