Allowable Loads on One Bolt in Timber Connection

The accuracy of this page is not guaranteed. This post is for educational purposes only. Please refer to National Structural Code of the Philippines (NSCP) for reliable data.

Allowable loads, in kiloNewton, on one bolt in seasoned wood loaded at both ends (double shear) normal duration

Length of Bolt in Main Member
(mm)
Bolt Diameter
(mm)
Species Group
I II III IV
Parallel to Grain Perpencular to Grain Parallel to Grain Perpencular to Grain Parallel to Grain Perpencular to Grain Parallel to Grain Perpencular to Grain
40 13 7.08 3.76 4.86 1.98 4.20 2.07 3.26 1.82
16 8.75 4.19 6.01 2.21 5.20 2.30 4.01 2.02
20 11.00 4.85 7.55 2.56 6.53 2.67 5.02 2.35
22 12.10 5.04 8.30 2.66 7.19 2.77 5.52 2.43
25 11.70 5.47 9.43 2.89 8.16 3.01 6.27 2.64
50 13 8.38 4.70 5.75 2.48 4.98 2.59 3.99 2.27
16 10.80 5.23 7.42 2.76 6.43 2.88 5.00 2.53
20 13.70 6.07 9.38 3.20 8.12 3.34 6.27 2.93
22 15.10 6.30 10.30 3.32 8.95 3.46 6.90 3.04
25 17.2 6.83 11.80 3.61 10.20 3.76 7.84 3.30
65 13 9.29 6.11 6.38 3.23 5.52 3.36 4.68 2.95
16 13.00 6.80 8.95 3.59 7.74 3.74 6.29 3.29
20 17.40 7.89 11.90 4.16 10.30 4.34 8.10 3.81
22 19.30 8.19 13.20 4.32 11.40 4.50 8.97 3.96
25 22.20 8.88 15.20 4.69 13.20 4.89 10.20 4.29
75 13 9.35 6.84 6.42 3.61 5.56 3.76 4.79 3.30
16 13.80 7.85 9.48 4.14 8.21 4.32 6.85 3.79
20 19.40 9.10 13.30 4.81 11.50 5.01 9.22 4.40
22 21.90 9.45 15.00 4.99 13.00 5.20 10.20 4.56
25 25.50 10.20 17.50 5.41 15.20 5.64 11.80 4.95
80 13 9.41 7.14 6.45 3.77 5.59 3.93 4.84 3.45
16 14.10 8.37 9.66 4.42 8.36 4.61 7.09 4.05
20 20.30 9.71 14.00 5.13 12.10 5.34 9.77 4.69
22 22.90 10.10 15.70 5.32 13.60 5.54 10.90 4.87
25 26.90 10.90 18.40 5.77 16.00 6.01 12.50 5.28
90 13 9.39 7.42 6.44 3.92 5.58 4.08 4.84 3.59
16 17.30 9.20 9.79 4.86 8.48 5.06 7.28 4.45
20 21.30 10.90 14.60 5.77 12.70 6.01 10.50 5.28
22 24.90 11.30 17.10 5.98 14.80 6.24 12.00 5.48
25 19.40 12.30 20.20 6.49 17.50 6.77 13.90 5.94
100 13 9.40 7.40 6.45 3.91 5.58 4.07 4.84 3.58
16 14.20 9.84 9.78 5.19 8.47 5.41 7.34 4.76
20 22.00 12.10 15.10 6.41 13.40 6.68 11.10 5.87
22 25.90 12.60 17.80 6.65 15.40 7.35 12.80 6.45
25 31.80 13.70 21.80 7.21 18.90 7.52 15.30 6.60
125 13 9.38 6.92 6.44 3.65 5.57 3.81 4.83 3.34
16 14.20 10.10 9.77 5.33 8.46 5.56 7.33 4.89
20 22.30 14.30 15.30 7.53 13.20 7.85 11.50 6.89
22 26.90 15.30 18.50 8.10 16.00 8.44 13.80 7.42
25 34.40 17.10 23.60 9.02 20.40 9.40 17.30 8.26
28 41.80 18.50 28.70 9.78 24.80 10.20 20.50 8.95
140 13 9.38 6.51 6.44 3.44 5.57 3.58 4.83 3.14
16 14.20 9.85 9.76 5.20 8.45 5.42 7.33 4.76
20 22.20 14.80 15.20 7.79 13.20 8.12 11.40 7.14
22 27.00 16.40 18.50 8.65 16.00 9.01 13.90 7.92
25 34.80 18.70 23.90 9.88 20.70 10.30 17.70 9.04
28 43.10 20.80 29.60 11.00 25.60 11.40 21.70 10.00
150 16 14.20 9.59 9.76 5.06 8.45 5.28 7.33 4.64
20 22.30 14.70 15.30 7.78 13.20 8.11 11.50 7.13
22 26.90 16.70 18.50 8.84 16.00 9.21 13.80 8.09
25 34.60 19.70 23.80 10.40 20.60 10.90 17.80 9.54
28 43.50 21.90 29.90 11.60 25.90 12.10 22.10 10.60
180 16 14.20 8.84 9.72 4.66 8.42 4.86 7.32 4.27
20 22.20 14.10 15.20 7.45 13.20 7.76 11.40 6.82
22 26.90 16.60 18.50 8.75 16.00 9.12 13.90 8.01
25 34.80 20.80 23.90 11.00 20.60 11.40 17.90 10.00
28 43.70 24.60 30.00 13.00 25.90 13.50 22.50 11.90
190 16 14.20 8.59 9.75 4.54 8.44 4.73 7.30 4.15
20 22.20 13.80 15.30 7.30 13.20 7.61 11.40 6.69
22 26.90 16.30 18.50 8.63 16.00 8.99 13.90 7.90
25 34.80 20.70 23.90 10.90 20.70 11.40 17.90 10.00
28 43.60 25.00 29.90 13.20 25.90 13.80 22.50 12.10
200 16 14.20 8.37 9.90 4.42 8.44 4.61 7.30 4.05
20 22.20 13.50 15.20 7.13 13.20 7.40 11.40 6.50
22 26.80 16.10 18.40 8.48 16.00 8.84 13.90 7.77
25 34.60 20.50 23.80 10.80 20.60 11.30 17.80 9.91
28 43.60 25.30 29.90 13.30 25.90 13.90 22.40 12.20
230 20 22.20 12.70 15.20 6.69 13.20 6.97 11.40 6.12
22 26.80 15.10 18.40 7.98 15.90 8.32 13.90 7.31
25 34.70 19.70 23.80 10.40 20.60 10.90 17.90 9.54
28 43.50 24.80 29.90 13.10 25.90 13.70 22.50 12.0
32 56.80 31.90 39.00 16.80 33.80 17.50 29.30 15.40
240 20 22.20 12.40 15.20 6.54 13.20 6.81 11.40 5.98
22 26.80 14.80 18.40 7.83 16.00 8.15 13.80 7.16
25 34.70 19.40 23.80 10.20 20.60 10.70 17.90 9.37
28 43.60 24.60 29.90 13.00 25.90 13.50 22.50 11.90
32 57.00 31.90 39.10 16.80 33.90 17.50 29.40 15.40
255 22 26.80 14.40 18.40 7.61 15.90 7.93 13.80 6.97
25 34.70 18.80 23.80 9.93 20.60 10.40 17.90 9.09
28 43.50 24.00 29.80 12.70 25.80 13.20 22.40 11.60
32 56.70 31.50 38.90 16.60 33.70 17.30 29.20 15.20
280 25 34.60 18.10 23.80 9.53 20.60 9.94 17.90 8.73
28 43.40 23.00 29.90 12.10 25.80 12.60 22.40 11.10
32 56.90 30.80 39.00 16.30 33.80 17.00 29.30 14.90
290 25 34.70 17.80 23.80 9.39 20.60 9.79 17.90 8.60
28 43.50 22.70 29.90 12.00 25.90 12.50 22.40 11.00
32 56.80 30.40 39.00 16.10 33.70 16.70 29.30 14.70
305 25 34.70 17.30 23.80 9.13 20.60 9.51 17.80 8.36
28 43.40 22.20 29.80 11.70 25.80 12.20 22.40 10.70
32 56.80 29.80 39.00 15.80 33.80 16.40 29.30 14.40

 

Group Species of Philippine Wood

I. High Strength Group II. Moderately High Strength Group III. Medium Strength Group IV. Moderately Low Strength Group
Agoho
Liusin
Malabayabas
Manggachapui
Molave
Narig
Sasalit
Yakal
Antipolo
Binggas
Bokbok
Dao
Gatasan
Guijo
Kamagong
Kamatog
Katmon
Kato
Lomarau
Mahogany, Big-leafed
Makaasim
Malakauayan
Narra
Pahutan
Apitong
Bagtikan
Dangkalan
Gisau
Lanutan-bagyo
Lauan
Malaanonang
Malasaging
Malugai
Miau
Nato
Palosapis
Pine
Salakin
Vidal lanutan
Almaciga
Bayok
Lingo-lingo
Mangasinoro
Raintree
Yemane