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ASME B18.2.5M:2013 Class 12.9 12-Point Flange Spline Head Bolt

ASME B18.2.5M:2013 Class 12.9 12-Point Flange Bolt uses a 12-point head with a flange bearing surface for metric joints requiring high strength, compact access, and efficient tightening.

The 12-point head allows tool engagement at smaller rotation increments, which helps in confined spaces. The flange increases bearing area, while the Class 12.9 application direction emphasizes high-load and high-strength fastening. Typical uses include powertrains, construction machinery, and high-performance equipment.

Strength class, wrenching size, flange diameter, and finish should be checked carefully. For high-strength joints, specified torque or tightening procedures should be followed to avoid overload or inconsistent assembly.

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Dimensions unit: mm

Thread size M5 M6 M8 M10 M12 M14 M16 M20 M24 M30 M36
d
P Pitch 0.8 1 1.25 1.5 1.75 2 2 2.5 3 3.5 4
ds Max. 5 6 8 10 12 14 16 20 24 30 36
Min. 4.82 5.82 7.78 9.78 11.73 13.73 15.73 19.67 23.67 29.67 35.61
s 公称 5 6 8 10 12 14 16 20 24 30 36
Max. 5 6 8 10 12 14 16 20 24 30 36
Min. 4.79 5.79 7.78 9.78 11.79 13.79 15.81 19.82 23.75 29.72 35.7
dk Min. 5.6 6.7 9 11.2 13.5 15.8 18 22.5 27 33.8 40.5
dc Max. 8.72 10.22 13.27 16.27 18.27 21.33 24.33 30.33 36.39 45.39 54.46
Min. 8.27 9.77 12.72 15.69 17.67 20.67 23.62 29.55 35.52 44.52 52.75
c Max. 2.25 2.7 3.6 4.5 5.4 6.3 7.2 9 10.8 13.5 16.2
Min. 2 2.45 3.35 4.13 5.03 5.93 6.83 8.5 10.3 13 15.6
k Max. 5 6 8 10 12 14 16 20 24 30 36
Min. 4.88 5.82 7.78 9.78 11.73 13.73 15.73 19.67 23.67 29.67 35.57
b L≤125 16 18 22 26 30 34 38 46 54 66 -
125＜L≤200 22 24 28 32 36 40 44 52 60 72 84
L＞200 35 37 41 45 49 53 57 65 73 85 97
dw Min. 8.03 9.38 12.33 15.33 17.23 20.17 23.17 28.87 34.81 43.61 52.54
kw Min. 2.63 3.12 4.18 5.28 6.33 7.43 8.53 10.67 12.87 16.17 19.37
Thread length b  - - - - - - - - - - -

① Material and mechanical properties

ⓐ Unless otherwise specified, steel screws shall comply with the requirements of ISO 898-1, performance class 12.9.

ⓑ Unless otherwise specified, corrosion-resistant steel screws shall comply with the performance levels specified in ISO 3506-1.

ⓒUnless otherwise specified, non-ferrous metal screws shall comply with the requirements of ASTM F468M or specified performance alloys. 

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