JIS B 1180 Standard

Pitch diameter hexagon head bolt, Coarse, product grades A and B

Pitch diameter Hexagon head screw bolt, Coarse, product grade A and B

    Notes

  • β = 15° to 30°
  • Minimum wrenching height k = 0.7 lmin
  • Washer face permissible
  • Reference datum for dw.
  • dw.min = smin. - IT 16 for width across flats < 21 mm.
    dw.min = 0.95smin for width across flats ≥ 21 mm.
  • The diameter ds is approximately equal to the pitch diameter of the thread. An increase of ds up to the nominal diameter is premitted within a length of 0.5d under the head.
  • End without special requirements.
  • 2P max. incomplete thread.
  • 0.2knom max.
  • The indentation and its shape are at the option of the manufacturer unless specified by the purchaser.

Pitch diameter hexagon head bolt, coarse, product grade B

Unit:mm

Designation of thread (d) M3 M4 M5 M6 M8 M10 M12 (M14) M16 M20
Pa 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5
b (informative) b) 12 14 16 18 22 26 30 34 38 46
e) - - - - 28 32 36 40 44 52
da max. 3.6 4.7 5.7 6.8 9.2 11.2 13.7 15.7 17.7 22.4
ds (approx) 2.6 3.5 4.4 5.3 7.1 8.9 10.7 12.5 14.5 18.2
dw min. 4.4 5.7 6.7 8.7 11.4 14.4 16.4 19.2 22 27.7
e min. 5.98 7.50 8.63 10.89 14.20 17.59 19.85 22.78 26.17 32.95
k Reference dimensions 2 2.8 3.5 4 5.3 6.4 7.5 8.8 10 12.5
min. 1.80 2.60 3.26 3.76 5.06 6.11 7.21 8.51 9.71 12.15
min. 2.20 3.00 3.74 4.24 5.54 6.69 7.79 9.09 10.29 12.85
k2) min. 1.3 1.8 2.3 2.6 3.5 4.3 5.1 6 6.8 8.5
r min. 0.1 0.2 0.2 0.25 0.4 0.4 0.6 0.6 0.6 0.8
s max. 5.5 7 8 10 13 16 18 21 24 30
min. 5.20 6.64 7.64 9.64 12.57 15.57 17.57 20.16 23.16 29.16
x max. 1.25 1.75 2 2.5 3.2 3.8 4.3 5 5 6.3
l lg lg lg lg lg lg lg lg lg lg
nom.
length		 min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max.
20 18.95 21.05 7 8 4.6 6
25 23.95 26.05 12 13 9.6 11 7.4 9 5 7
30 28.95 31.05 17 18 14.6 16 12.4 14 10 12 5.5 8
35 33.75 36.25 19.6 21 17.4 19 15 17 10.5 13
40 38.75 41.25 24.6 26 22.4 25 20 22 15.5 18 11 14
45 43.75 46.25 27.4 29 25 27 20.5 23 16 19 11.5 15
50 48.75 51.25 32.4 34 30 32 22.7 28 21 24 16.5 20 12 16
55 53.5 56.5 35 37 30.5 33 26 29 21.5 25 17 21 13 17
60 58.5 61.5 40 42 35.5 38 31 34 26.5 30 22 26 18 22
65 63.5 66.5 4.05 43 36 39 31.5 35 27 31 23 27 14 19
70 68.5 66.5 45.5 48 41 44 36.5 40 32 36 28 32 19 34
80 78.5 81.5 55.5 58 51 54 46.5 50 42 46 38 42 29 34
90 88.25 91.75 61 64 56.5 60 52 56 48 52 39 44
100 98.25 101.75 71 74 66.5 70 62 66 58 62 49 54
110 108.25 111.75 76.5 80 72 76 68 72 59 64
120 118.25 121.75 86.5 90 82 86 78 82 69 74
130 128 132 86 90 82 86 73 70
140 138 142 96 100 92 96 83 80
150 148 152 102 106 93 98

The range of Prefered lengths is between the solid, bold, stepped lines.
Thread designation shown in brackets should be avoided if possible.
lg.max = lnom - b (informative)
lg.min = lg.max - 2P
Notes
a) P is the pitch of the thread.
b) For lnom≤ 125 mm.
c) For 125 mm < lnom≤ 200 mm.

Product specifications of pitch diameter hexagon head screw bolts, Coarse, product grade B

Material Steel Stainless steel Non-ferrous metal
General
requirements		 Applicable standard JIS B 1099
Thread Tolerance class 6g
Applicable standard JIS B 0205-4, JIS B 0209-1
Mechanical
properties		 Property classa) 5.8, 6.8, 8.8 A2-70 Material are
specified in
JIS B 1057.
Applicable standard JIS B 1051 JIS B 1054-1
Tolerance Product grade B
Applicable standard JIS B 1021
Finish--Coating As processed
Requirements for electroplating are specified in JIS B 1044.
Additional requirements or other finishes or coatings shall be agreed between the purchaser and the manufacturer.
Acceptability Acceptance inspection is specified in JIS B 1091.