Ocean Century (Qingdao) Industrial Co., Ltd.
Ocean Century (Qingdao) Industrial Co., Ltd.
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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.
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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 | ||