〔 TECHNICAL DATA 〕 SOCKET HEAD CAP SCREWS REFERENCE: JIS B 1176 (2014)
1. Dimensions of each part
2. L, ℓ s and ℓ g of socket head cap screw
Unit: mm
Nominal diameter of thread (d)
M3 M4 M5 M6 M8 M10 M12 (M14)
M16 (M18)
M20 (M22)
M24 (M27)
M30
Tip is chamfered. However, M4 or less may have rough tip.
t
L
ℓs min. and ℓg max.
t
w
w
ℓs min.
Nominal length
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
ℓs min.
ℓg max.
d
Conical bottom
min. max.
5 4.76 5.24 6 5.76 6.24 8 7.71 8.29 10 9.71 10.29 12 11.65 12.35 16 15.65 16.35 20 19.58 20.42 25 24.58 25.424.5 7 30 29.58 30.429.512 6.510 4 8 35 34.5 35.5
Incomplete thread part (2P or less)
s
l
s
Cut bottom
The hexagonal hole may be internally chamfered.
(Reference)
b
g
l
k
L
Largest condition of roundness under bead
Rounded or chamfered head
Roundness
f (max.) = 1.7r (max.)
f
11.515 913 611
r (max.) = da (max.)–ds (max.) 2 r (min.) = in accordance with the values of the appended table
16.52014181116 5.7512
40 39.5 40.5 45 44.5 45.5 50 49.5 50.5 55 54.4 55.6 60 59.4 60.6 65 64.4 65.6 70 69.4 70.6 80 79.4 80.6 90 89.3 90.7 100 99.3100.7 110 109.3 110.7 120 119.3 120.7 130 129.2 130.8 140 139.2 140.8 150 149.2 150.8 160 159.2 160.8 180 179.2 180.8 200 199.05 200.95 220 219.05 220.95 240 239.05 240.95 260 258.95 261.05 280 278.95 281.05 300 298.95 301.05
v
1923162110.7517 5.513 24 28 21 26 15.75 22 10.5 18
Chamfering
26 31 20.75 27 15.5 23 10.25 19
313625.753220.52815.252410 20
Unit: mm
30.753725.53320.2529 15 25 11 21 4.5 17 35.754230.53825.2534 20 30 16 26 9.5 22
Nominal diameter of thread (d) ( 2 ) Pitch of screw thread (P)
M3
M4
M5
M6 M8 M10 M12
(M14)
M16
(M18)
M20
(M22)
M24
(M27)
M30
45.755240.54835.2544 30 40 26 36 19.5 32 15.5 28 11.5 24
0.5
0.7
0.8
1
1.25 1.5
1.75 2
2
2.5
2.5
2.5
3
3
3.5
50.55845.2554 40 50 36 46 29.5 42 25.5 38 21.5 34 15 30 9 24 60.56855.2564 50 60 46 56 39.5 52 35.5 48 31.5 44 25 40 19 34
Reference 18 Max. (Basic size) ＊ 5.5
20
22
24
28 13
32 16
36 18
40 21
44 24
48 27
52 30
56 33
60 36
66 40
72 45
b
65.2574 60 70 56 66 49.5 62 45.5 58 41.5 54 35 50 29 44 20.5 38 75.2584 70 80 66 76 59.5 72 55.5 68 51.5 64 45 60 39 54 30.5 48 80 90 76 86 69.5 82 65.5 78 61.5 74 55 70 49 64 40.5 58 90100 86 96 79.5 92 75.5 88 71.5 84 65 80 59 74 50.5 68
7
8.5 10
d k Max. ＊＊ 5.68 7.22 8.72 10.22 13.27 16.27 18.27 21.33 24.33 27.33 30.33 33.39 36.39 40.39 45.39 Min. 5.32 6.78 8.28 9.78 12.73 15.73 17.73 20.67 23.67 26.67 29.67 32.61 35.61 39.61 44.61 d a Max. 3.6 4.7 5.7 6.8 9.2 11.2 13.7 15.7 17.7 20.2 22.4 24.4 26.4 30.4 33.4
96 106 89.5 102 85.5 98 81.5 94 75 90 69 84 60.5 78 106116 99.5112 95.5108 91.5104 85100 79 94 70.5 88 119.5132115.5128111.5124105120 99114 90.5108
Max. (Basic size) 3
4
5
6
8
10
12
14
16
18
20
22
24
27
30
d s
Min. 2.86 3.82 4.82 5.82 7.78 9.78 11.73 13.73 15.73 17.73 19.67 21.67 23.67 26.67 29.67 e Min. 2.87 3.44 4.58 5.72 6.86 9.15 11.43 13.72 16.00 16.00 19.44 19.44 21.73 21.73 25.15 f Max. 0.51 0.60 0.60 0.68 1.02 1.02 1.45 1.45 1.45 1.87 2.04 2.04 2.04 2.89 2.89
135.5 148 131.5 144 125 140 119 134 110.5 128
139 154 130.5 148 159 174 150.5 168 179 194 170.5 188 199 214 190.5 208 219 234 210.5 228
Max. (Basic size) 3
4
5
6
8
10
12
14
16
18
20
22
24
27
30
k
Min. 2.86 3.82 4.82 5.70 7.64 9.64 11.57 13.57 15.57 17.57 19.48 21.48 23.48 26.48 29.48 r Min. 0.1 0.2 0.2 0.25 0.4 0.4 0.6 0.6 0.6 0.6 0.8 0.8 0.8 1 1
Nominal designation (Basic size)
2.5
3
4
5
6
8
10
12
14
14
17
17
19
19
22
s
Min. 2.52 3.02 4.02 5.02 6.02 8.025 10.025 12.032 14.032 14.032 17.05 17.050 19.065 19.065 22.065 Max. ( 1 ) Column 1 2.580 3.080 4.095 5.140 6.140 8.175 10.175 12.212 14.212 14.212 17.230 17.230 19.275 19.275 22.275 Column 2 2.560 3.080 4.095 5.095 6.095 8.115 10.115 12.142 14.142 14.142 t Min. 1.3 2 2.5 3 4 5 6 7 8 9 10 11 12 13.5 15.5 v Max. 0.3 0.4 0.5 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.7 3 d w Min. 5.07 6.53 8.03 9.38 12.33 15.33 17.23 20.17 23.17 25.87 28.87 31.81 34.81 38.61 43.61 w Min. 1.15 1.4 1.9 2.3 3.3 4 4.8 5.8 6.8 7.7 8.6 9.5 10.4 12.1 13.1 Note ( 1 ): The column 1 of s (max.) shall apply to cap screws of 8.8 and 10.9 strength division and those of A 2–50 and A 2–70 property division. The column 2 shall apply to cap screws of 12.9 strength division. However, by agreement between the concerned delivery parties, column 1 can be applied to cap screws of 12.9 strength division. Furthermore, the s (max.) of M 20 and above in nominal designation of screw thread shall apply to all the cap screws strength division and property division. Note ( 2 ): Cap screws having a nominal designation inside a parentheses shall not be used as far as possible. Remarks 1. The flank of head part shall be appended to a parallel or crossed knurl [see JIS B 0951 (knurl)]. In this case, dk (max.) shall be the value marked with ＊＊ given in this table. Furthermore, where the cap screws without knurl are required, the orderer shall specify it. However, dk (max.) shall be the value marked with ＊ given in this table. 2. The nominal length (L) recommendable to the nominal designation of screw thread shall be within the frame of bold lines. Furthermore, for L shorter than the position of dotted line, it shall be whole threads and the length of the incomplete thread section at the under–head part shall be approx. 3P. 3. T he Lg (max.) and Ls (min.) for the cap screw, of which the nominal length (L) is longer than the position of dotted line, shall be in accordance with the following formula: Lg (max.) = Nominal length (L)–b Ls (min.) = Lg (max.)–5P
Reference : Dimensions of counterboring and bolt hole for the socket head cap screws
Unit: mm
d k D ′
D ′ d k
Nominal diameter of thread (d)
M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30
ds
3 4 5 6 810121416182022242730 3.4 4.5 5.5 6.6 9 11 14 16 18 20 22 24 26 30 33 5.5 7 8.5 10 13 16 18 21 24 27 30 33 36 40 45 6.5 8 9.5 11 14 17.5 20 23 26 29 32 35 39 43 48 3 4 5 6 810121416182022242730 2.7 3.6 4.6 5.5 7.4 9.211 12.814.516.518.520.522.525 28 3.3 4.4 5.4 6.5 8.610.813 15.217.519.521.523.525.529 32 2.6 3.4 4.3 5.1 6.9 8.610.412.214.215.717.719.721.224.226.7
d ′
d ′ d s
d s d ′
dk
D ′
d
d
K
d 2
d 2
H ′
H” d2
1223
1224
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