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ASME B18.6.3 (H9A):2024 Hex Head Heavy Hex Slotted Screw
ASME B18.6.3 (H9A):2024 Hex Head Heavy Hex Slotted Screw combines a slotted drive with a hex head, making it suitable for fastening points that require reliable clamping, removable maintenance, and standardized assembly. The ASME standard framework suits projects requiring U.S.-standard compatibility and engineering applicability, supporting smooth alignment between engineering drawings, purchasing lists, and quality inspection.
From an assembly perspective, the slot is easy to identify and works with simple tools, which supports routine maintenance and manual assembly. At the same time, the external hex head provides a robust driving form for installation and removal with wrenches, sockets, or power tools, so the screw can provide stable fastening performance across different sheet thicknesses, appearance requirements, and space limitations.
It works well for equipment connections, bracket fastening, structural assemblies, and sites requiring convenient maintenance. For batch assembly, the product can be tailored around workstation tools, tightening torque, visual grade, and packaging method to reduce sorting cost and improve assembly consistency.
Dimensions unit: inch
|
Thread size d |
1# |
2# |
3# |
4# |
5# |
6# |
8# |
10# |
12# |
1/4 |
5/16 |
3/8 |
7/16 |
1/2 |
||
|
d |
Nominal |
0.073 |
0.086 |
0.099 |
0.112 |
0.125 |
0.138 |
0.164 |
0.19 |
0.216 |
0.25 |
0.3125 |
0.375 |
0.4375 |
0.5 |
|
|
PP |
64 |
56 |
48 |
40 |
40 |
32 |
32 |
24 |
24 |
20 |
18 |
16 |
14 |
13 |
||
|
s1 |
Standard type |
Max. |
0.125 |
0.125 |
0.188 |
0.188 |
0.188 |
0.25 |
0.25 |
0.312 |
0.312 |
0.375 |
0.5 |
0.562 |
0.625 |
0.75 |
|
Min. |
0.12 |
0.12 |
0.181 |
0.181 |
0.181 |
0.244 |
0.244 |
0.305 |
0.305 |
0.367 |
0.489 |
0.551 |
0.61 |
0.735 |
||
|
s2 |
Big hexagon |
Max. |
/ |
/ |
/ |
0.219 |
0.25 |
/ |
0.312 |
/ |
0.375 |
0.438 |
/ |
/ |
/ |
/ |
|
Min. |
/ |
/ |
/ |
0.213 |
0.244 |
/ |
0.305 |
/ |
0.367 |
0.428 |
/ |
/ |
/ |
/ |
||
|
e1 |
Standard type |
Min. |
0.134 |
0.134 |
0.202 |
0.202 |
0.202 |
0.272 |
0.272 |
0.34 |
0.34 |
0.409 |
0.545 |
0.614 |
0.682 |
0.82 |
|
e2 |
Big hexagon |
Min. |
/ |
/ |
/ |
0.238 |
0.272 |
/ |
0.34 |
/ |
0.409 |
0.477 |
/ |
/ |
/ |
/ |
|
k |
Max. |
0.044 |
0.05 |
0.055 |
0.06 |
0.07 |
0.093 |
0.11 |
0.12 |
0.155 |
0.19 |
0.23 |
0.295 |
0.348 |
0.4 |
|
|
Min. |
0.036 |
0.04 |
0.044 |
0.049 |
0.058 |
0.08 |
0.096 |
0.105 |
0.139 |
0.172 |
0.208 |
0.27 |
0.321 |
0.367 |
||
|
n |
Max. |
/ |
/ |
/ |
0.039 |
0.043 |
0.048 |
0.054 |
0.06 |
0.067 |
0.075 |
0.084 |
0.094 |
/ |
/ |
|
|
Min. |
/ |
/ |
/ |
0.031 |
0.035 |
0.039 |
0.045 |
0.05 |
0.056 |
0.064 |
0.072 |
0.081 |
/ |
/ |
||
|
t ④ |
Max. |
/ |
/ |
/ |
0.036 |
0.042 |
0.046 |
0.066 |
0.072 |
0.093 |
0.101 |
0.122 |
0.156 |
/ |
/ |
|
|
Min. |
/ |
/ |
/ |
0.025 |
0.03 |
0.033 |
0.052 |
0.057 |
0.077 |
0.083 |
0.1 |
0.131 |
/ |
/ |
||
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Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010.
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