One of our production bases specializes in cold heading, steel wire
finishing and drawing, high-quality and high-precision standard and
non-standard fasteners research and development, production, and
sales.
The company has scientific and reasonable management, powerful
technical strength, and advanced equipment. We have various metal
processing technology methods, with high-precision CNC lathe, many
wire drawing machine specifications, and various models of cold
heading machines, etc.
We can design, produce, and process many kinds of non-standard
fasteners and various American, British, and German hardware, such
as bolts, nuts, shafts, pins, high-standard locating pins, and
more. The materials used include carbon steel, stainless steel,
copper wire, and alloy structural steel, etc. All the products are
widely used in electronics, computers, home appliances, lamps and
lanterns, automobiles, sports equipment, toys, new energy, and
other fields.
Furthermore, we have an automatic metallographic testing machine, a
tensile testing machine, a hardness tester, a salt spray testing
machine, and various physical and chemical experimental devices to
ensure the excellent quality of the product base material.
Nominal Size | A | W | H | B | U | Optional |
Width Across Flats | Width Across Cormers | Head Height | WasherDiameter | Washer Thickness | Undercut Depth | Undercut Diameter |
Max. | Min. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Max. |
4 | 0.188 | 0.181 | 0.202 | 0.060 | 0.049 | 0.243 | 0.225 | 0.019 | 0.011 | 0137 | .1850 |
6 | 0.250 | 0.244 | 0.272 | 0.093 | 0.08 | 0.328 | 0.302 | 0.025 | 0.015 | .0157 | .2523 |
8 | 0.250 | 0.244 | 0.272 | 0.110 | 0.096 | 0.348 | 0.322 | 0.031 | 0.019 | .0196 | .2523 |
10 | 0.312 | 0.305 | 0.340 | 0.120 | 0.105 | 0.414 | 0.384 | 0.031 | 0.019 | 0196 | .3203 |
12 | 0.312 | 0.305 | 0.340 | 0.155 | 0.139 | 0.432 | 0.398 | 0.039 | 0.022 | 0236 | .3203 |
1/4 | 0.375 | 0.367 | 0.409 | 0.190 | 0.172 | 0.520 | 0.480 | 0.050 | 0.030 | 0314 | .3893 |
5/16 | 0.500 | 0.488 | 0.544 | 0.229 | 0.207 | 0.676 | 0.624 | 0.055 | 0.035 | 0393 | .5253 |
Nominal Size | Type BSD |
Threads per Inch | D | d | Z |
|
Major Dia | Minor Dia | Mprotusion | Formed | Milled |
Max. | Min. | Max. | Min. | Ref. | 90°Head | Csk Head | 90°Head | Csk Head |
4 | 24 | .114 | .110 | .086 | .082 | .163 | 5/16 | 3/8 | 3/8 | 7/16 |
6 | 20 | .139 | .135 | .104 | .099 | 190 | 5/16 | 3/8 | 3/8 | 7/16 |
8 | 18 | .166 | .161 | .122 | .116 | 211 | 3/8 | 7/16 | 7/16 | 1/2 |
10 | 16 | .189 | .183 | .141 | .135 | .300 | 1/2 | 9/16 | 9/16 | 21/32 |
12 | 14 | 215 | .209 | ,164 | .157 | .353 | 1/2 | 5/8 | 21/32 | 25/32 |
1/4 | 14 | 246 | 240 | .192 | .185 | 393 | 1/2 | 5/8 | 11/16 | 27/32 |
5/16 | 12 | .314 | .305 | .272 | 263 | 421 | 5/8 | 3/4 |
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