1/2″ Bolt or dowelDouble Shear, 6 mm steel internal plates to Spruce-Pine glulam

Selection Tables

	1/2″ Bolt or dowel Double Shear, 6 mm steel internal plates to Spruce-Pine glulam
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, a_L, and the spacing between bolts in a row, S_R (mm)
51	76	102	127	152	51	76	102	127	152
80	114	1	0	6.80(R)	10.2(R)	13.6(R)	17.0(R)	20.4(R)	10.2(R)	15.3(R)	20.4(R)	25.5(R)	30.6(R)
80	228	2	38.1	13.6(R)	20.4(R)	27.2(R)	34.0(R)	39.9(G)	20.4(R)	30.6(R)	39.9(G)	45.0(G)	50.1(G)
80	228	2	63.5	13.6(R)	20.4(R)	27.2(R)	34.0(R)	40.8(R)	20.4(R)	30.6(R)	40.8(R)	51.0(R)	61.2(R)
80	228	2	88.9	13.6(R)	20.4(R)	27.2(R)	34.0(R)	40.8(R)	20.4(R)	30.6(R)	40.8(R)	51.0(R)	61.2(R)
80	342	3	38.1	20.4(R)	30.6(R)	40.8(R)	51.0(R)	59.4(G)	30.6(R)	45.9(R)	59.4(G)	64.5(G)	69.6(G)
80	342	3	62.5	20.4(R)	30.6(R)	40.8(R)	51.0(R)	61.2(R)	30.6(R)	45.9(R)	61.2(R)	76.4(R)	91.7(R)
130	152	1	0	11.6(R)	17.5(R)	23.3(R)	25.5(d)	25.5(d)	17.5(R)	26.2(R)	34.9(R)	38.2(d)	38.2(d)
130	190	2	38.1	23.3(R)	34.9(R)	46.6(R)	51.0(d)	51.0(d)	34.9(R)	52.4(R)	68.4(G)	76.5(d)	76.5(d)
130	190	2	63.5	23.3(R)	34.9(R)	46.6(R)	51.0(d)	51.0(d)	34.9(R)	52.4(R)	69.9(R)	76.5(d)	76.5(d)
130	190	2	88.9	23.3(R)	34.9(R)	46.6(R)	51.0(d)	51.0(d)	34.9(R)	52.4(R)	69.9(R)	76.5(d)	76.5(d)
130	266	3	38.1	34.9(R)	52.4(R)	69.9(R)	76.5(d)	76.5(d)	52.4(R)	78.6(R)	102(G)	111(G)	115(d)
130	266	3	62.5	34.9(R)	52.4(R)	69.9(R)	76.5(d)	76.5(d)	52.4(R)	78.6(R)	105(R)	115(d)	115(d)
175	190	1	0	16.0(R)	24.0(R)	29.0(d)	29.0(d)	29.0(d)	24.0(R)	36.0(R)	43.5(d)	43.5(d)	43.5(d)
175	190	2	38.1	32.0(R)	48.1(R)	58.0(d)	58.0(d)	58.0(d)	48.1(R)	72.1(R)	87.0(d)	87.0(d)	87.0(d)
175	190	2	63.5	32.0(R)	48.1(R)	58.0(d)	58.0(d)	58.0(d)	48.1(R)	72.1(R)	87.0(d)	87.0(d)	87.0(d)
175	190	2	88.9	32.0(R)	48.1(R)	58.0(d)	58.0(d)	58.0(d)	48.1(R)	72.1(R)	87.0(d)	87.0(d)	87.0(d)
175	228	3	38.1	48.1(R)	72.1(R)	87.0(d)	87.0(d)	87.0(d)	72.1(R)	108(R)	131(d)	131(d)	131(d)
175	228	3	62.5	48.1(R)	72.1(R)	87.0(d)	87.0(d)	87.0(d)	72.1(R)	108(R)	131(d)	131(d)	131(d)
215	266	1	0	19.9(R)	29.9(R)	32.1(d)	32.1(d)	32.1(d)	29.9(R)	44.8(R)	48.2(d)	48.2(d)	48.2(d)
215	266	2	38.1	39.8(R)	59.7(R)	64.3(d)	64.3(d)	64.3(d)	59.7(R)	89.6(R)	96.4(d)	96.4(d)	96.4(d)
215	266	2	63.5	39.8(R)	59.7(R)	64.3(d)	64.3(d)	64.3(d)	59.7(R)	89.6(R)	96.4(d)	96.4(d)	96.4(d)
215	266	2	88.9	39.8(R)	59.7(R)	64.3(d)	64.3(d)	64.3(d)	59.7(R)	89.6(R)	96.4(d)	96.4(d)	96.4(d)
215	266	3	38.1	59.7(R)	89.6(R)	96.4(d)	96.4(d)	96.4(d)	89.6(R)	134(R)	145(d)	145(d)	145(d)
215	266	3	62.5	59.7(R)	89.6(R)	96.4(d)	96.4(d)	96.4(d)	89.6(R)	134(R)	145(d)	145(d)	145(d)
265	342	1	0	24.8(R)	32.3(g)	32.3(g)	32.3(g)	32.3(g)	37.1(R)	48.4(g)	48.4(g)	48.4(g)	48.4(g)
265	342	2	38.1	49.5(R)	64.5(g)	64.5(g)	64.5(g)	64.5(g)	74.3(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)
265	342	2	63.5	49.5(R)	64.5(g)	64.5(g)	64.5(g)	64.5(g)	74.3(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)
265	342	2	88.9	49.5(R)	64.5(g)	64.5(g)	64.5(g)	64.5(g)	74.3(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)
265	342	3	38.1	74.3(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)	111(R)	145(g)	145(g)	145(g)	145(g)
265	342	3	62.5	74.3(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)	111(R)	145(g)	145(g)	145(g)	145(g)
315	380	1	0	29.6(R)	32.3(g)	32.3(g)	32.3(g)	32.3(g)	44.4(R)	48.4(g)	48.4(g)	48.4(g)	48.4(g)
315	380	2	38.1	59.2(R)	64.5(g)	64.5(g)	64.5(g)	64.5(g)	88.8(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)
315	380	2	63.5	59.2(R)	64.5(g)	64.5(g)	64.5(g)	64.5(g)	88.8(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)
315	380	2	88.9	59.2(R)	64.5(g)	64.5(g)	64.5(g)	64.5(g)	88.8(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)
315	380	3	38.1	88.8(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)	133(R)	145(g)	145(g)	145(g)	145(g)
315	380	3	62.5	88.8(R)	96.8(g)	96.8(g)	96.8(g)	96.8(g)	133(R)	145(g)	145(g)	145(g)	145(g)

Notes: 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. 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. The tabulated lateral resistances are based on removing a 10 mm thick slot to accommodate the 6 mm internal steel plate. 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), P_r = P'_r for yielding failure mode (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. For D.Fir-L glulam, the tabulated values are valid for 24f-E, 24f-EX, 20f-E, 20f-EX or 16c-E grade. For Spruce-Pine glulam, the tabulated values are valid for 20f-E, 20f-EX or 12c-E grade. 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. 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. N/A = not applicable.

1/2″ Bolt or dowel
Double Shear, 6 mm steel internal plates to Spruce-Pine glulam

Wood Member

Fastener

Thickness
(mm)

Depth
(mm)

No.
of
rows

No. of fasteners in a row

Bolt spacing in a row taken as the minimum of the loaded end distance⁴, a_L, and the spacing between bolts in a row, S_R (mm)

102

127

152

102

127

152

114

6.80(R)

10.2(R)

13.6(R)

17.0(R)

20.4(R)

10.2(R)

15.3(R)

20.4(R)

25.5(R)

30.6(R)

228

38.1

13.6(R)

20.4(R)

27.2(R)

34.0(R)

39.9(G)

20.4(R)

30.6(R)

39.9(G)

45.0(G)

50.1(G)

228

63.5

13.6(R)

20.4(R)

27.2(R)

34.0(R)

40.8(R)

20.4(R)

30.6(R)

40.8(R)

51.0(R)

61.2(R)

228

88.9

13.6(R)

20.4(R)

27.2(R)

34.0(R)

40.8(R)

20.4(R)

30.6(R)

40.8(R)

51.0(R)

61.2(R)

342

38.1

20.4(R)

30.6(R)

40.8(R)

51.0(R)

59.4(G)

30.6(R)

45.9(R)

59.4(G)

64.5(G)

69.6(G)

342

62.5

20.4(R)

30.6(R)

40.8(R)

51.0(R)

61.2(R)

30.6(R)

45.9(R)

61.2(R)

76.4(R)

91.7(R)

130

152

11.6(R)

17.5(R)

23.3(R)

25.5(d)

17.5(R)

26.2(R)

34.9(R)

38.2(d)

130

190

38.1

23.3(R)

34.9(R)

46.6(R)

51.0(d)

34.9(R)

52.4(R)

68.4(G)

76.5(d)

130

190

63.5

23.3(R)

34.9(R)

46.6(R)

51.0(d)

34.9(R)

52.4(R)

69.9(R)

76.5(d)

130

190

88.9

23.3(R)

34.9(R)

46.6(R)

51.0(d)

34.9(R)

52.4(R)

69.9(R)

76.5(d)

130

266

38.1

34.9(R)

52.4(R)

69.9(R)

76.5(d)

52.4(R)

78.6(R)

102(G)

111(G)

115(d)

130

266

62.5

34.9(R)

52.4(R)

69.9(R)

76.5(d)

52.4(R)

78.6(R)

105(R)

115(d)

175

190

16.0(R)

24.0(R)

29.0(d)

24.0(R)

36.0(R)

43.5(d)

175

190

38.1

32.0(R)

48.1(R)

58.0(d)

48.1(R)

72.1(R)

87.0(d)

175

190

63.5

32.0(R)

48.1(R)

58.0(d)

48.1(R)

72.1(R)

87.0(d)

175

190

88.9

32.0(R)

48.1(R)

58.0(d)

48.1(R)

72.1(R)

87.0(d)

175

228

38.1

48.1(R)

72.1(R)

87.0(d)

72.1(R)

108(R)

131(d)

175

228

62.5

48.1(R)

72.1(R)

87.0(d)

72.1(R)

108(R)

131(d)

215

266

19.9(R)

29.9(R)

32.1(d)

29.9(R)

44.8(R)

48.2(d)

215

266

38.1

39.8(R)

59.7(R)

64.3(d)

59.7(R)

89.6(R)

96.4(d)

215

266

63.5

39.8(R)

59.7(R)

64.3(d)

59.7(R)

89.6(R)

96.4(d)

215

266

88.9

39.8(R)

59.7(R)

64.3(d)

59.7(R)

89.6(R)

96.4(d)

215

266

38.1

59.7(R)

89.6(R)

96.4(d)

89.6(R)

134(R)

145(d)

215

266

62.5

59.7(R)

89.6(R)

96.4(d)

89.6(R)

134(R)

145(d)

265

342

24.8(R)

32.3(g)

37.1(R)

48.4(g)

265

342

38.1

49.5(R)

64.5(g)

74.3(R)

96.8(g)

265

342

63.5

49.5(R)

64.5(g)

74.3(R)

96.8(g)

265

342

88.9

49.5(R)

64.5(g)

74.3(R)

96.8(g)

265

342

38.1

74.3(R)

96.8(g)

111(R)

145(g)

265

342

62.5

74.3(R)

96.8(g)

111(R)

145(g)

315

380

29.6(R)

32.3(g)

44.4(R)

48.4(g)

315

380

38.1

59.2(R)

64.5(g)

88.8(R)

96.8(g)

315

380

63.5

59.2(R)

64.5(g)

88.8(R)

96.8(g)

315

380

88.9

59.2(R)

64.5(g)

88.8(R)

96.8(g)

315

380

38.1

88.8(R)

96.8(g)

133(R)

145(g)

315

380

62.5

88.8(R)

96.8(g)

133(R)

145(g)

Notes:

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.
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.
The tabulated lateral resistances are based on removing a 10 mm thick slot to accommodate the 6 mm internal steel plate.
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),
- P_r = P'_r for yielding failure mode (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.
For D.Fir-L glulam, the tabulated values are valid for 24f-E, 24f-EX, 20f-E, 20f-EX or 16c-E grade. For Spruce-Pine glulam, the tabulated values are valid for 20f-E, 20f-EX or 12c-E grade.
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.
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.
N/A = not applicable.