Hexagon Socket Flat Head Cap Screws(Inch thread)
Our production range of Alloy steel Hexagon Socket Button Head Cap Screws per ASME B18.3-2002 is from #4 to 3/4". The UNC or UNF thread is 3A. We have the items in stock so that we can serivce our customers rapidly. Some people call flat head screw as CSK screw.
Surface Treatment:
- Item：Hex Socket Flat Head Cap Screw, Alloy Steel Hex Socket Flat head Cap Screw, Torx Flat Head Cap Screw, Stainless Steel Hex Socket Flat head Cap Screw
- According To：ASME B18.3-2002
- Material：Alloy Steel SCM435、Stainless Steel 304
- Hardness：HRC 38~44
- Surface Treatment : Black Oxide, Black phosphate plated, Bright Zinc plated, CR3+ plated, Black Zinc plated, Nickel plated,chrome plating ,GEOMAT, Nylon or ND patch
- Screw Threads：ANSI B1.1 UNC,UNF
- Class of Thread：ANSI B1.1 Class 3A
- Quality Control : Salt Spray test, hardness test, tensile load test,PPAP report available
- Packing : Bulk packing, small box packing, customized packing
Unit：inch
| Nominal Size or Basic Screw Diameter | D | A | H | J | T | F | LT | ||
|---|---|---|---|---|---|---|---|---|---|
| Body Diameter | Head Diameter | Head Height | Hexagon Socket Size | Key Engage-ment | Fillet Transition Diameter | Thread Length | |||
| Theoretical Sharp | Abs | ||||||||
| Max. | Min. | Max. | Min. | Ref. | Nom. | Min. | Max. | Basic | |
| ＃6 0.1380 | 0.1380 | 0.1329 | 0.307 | 0.263 | 0.097 | 5/64 0.078 | 0.066 | 0.168 | 0.75 |
| ＃8 0.1640 | 0.1640 | 0.1585 | 0.359 | 0.311 | 0.112 | 3/32 0.094 | 0.076 | 0.194 | 0.88 |
| ＃10 0.1900 | 0.1900 | 0.1840 | 0.411 | 0.359 | 0.127 | 1/8 0.125 | 0.087 | 0.220 | 0.88 |
| 1/4 0.2500 | 0.2500 | 0.2435 | 0.531 | 0.480 | 0.161 | 5/32 0.156 | 0.111 | 0.280 | 1.00 |
| 5/16 0.3125 | 0.3125 | 0.3053 | 0.656 | 0.600 | 0.198 | 3/16 0.188 | 0.135 | 0.343 | 1.12 |
| 3/8 0.3750 | 0.3750 | 0.3678 | 0.781 | 0.720 | 0.234 | 7/32 0.219 | 0.159 | 0.405 | 1.25 |
| 7/16 0.4375 | 0.4375 | 0.4294 | 0.844 | 0.781 | 0.234 | 1/4 0.250 | 0.159 | 0.468 | 1.38 |
| 1/2 0.5000 | 0.5000 | 0.4919 | 0.938 | 0.782 | 0.251 | 5/16 0.312 | 0.172 | 0.530 | 1.50 |
| 5/8 0.6250 | 0.6250 | 0.6163 | 1.188 | 1.112 | 0.324 | 3/8 0.375 | 0.220 | 0.655 | 1.75 |
| 3/4 0.7500 | 0.7500 | 0.7406 | 1.438 | 1.355 | 0.396 | 1/2 0.500 | 0.220 | 0.78 | 2.00 |