Class A/B/C/D
ASTM A453 Grade 660 Countersunk Screws often refered as csk Class A, B, C & D offered at TorqBolt are manufactured in accordance with ASME B18.3, ASME B18.6.3, ASME B18.3.1M, DIN 7991, ISO 10462 standards in metric and imperial coarse and fine thread sizes with UNC, UN, UNF, UNEF, UNJF & ISO threads.
| Screws | DIN | ISO | BS | ASME | IS | NFE | UNI | |
|---|---|---|---|---|---|---|---|---|
| Mertic | Imperial | |||||||
| Close Tolerance Flat Countersunk Head Machine Screws | - | - | - | - | B18.6.3 | - | - | - |
| Cross Recessed Countersunk Flat Head Screws | - | 7049 | - | - | - | - | - | - |
| Cross Recessed Countersunk Head Self | - | 15482 | - | - | - | - | - | - |
| Flat Countersunk Head Machine Screws | - | - | - | - | B18.6.3 / B18.6.3 | - | - | - |
| Hexagon Socket Countersunk Head Screws | - | - | 4168 | - | - | - | - | - |
| Hexalobular Countersunk Machine Screws | 965 | 14581 | - | - | - | - | - | - |
| Hexalobular Countersunk Screws | - | 10642 | - | - | - | - | - | - |
| Hexalobular Countersunk Thread Rolling Screws | 7500M | - | - | - | - | - | - | - |
| Hexalobular Raised Countersunk Machine Screws | 966TX | 14584 | - | - | - | - | - | - |
| Philip Flat Head Countersunk Screws | - | 7046 | - | - | - | - | - | - |
| Phillips Raised Countersunk Machine Screws | 966H | - | - | - | - | - | - | - |
| Pozi Countersunk Head Machine Screws | - | - | 450 / 57 | - | - | - | - | - |
| Pozi Countersunk Machine Screws | 965Z | - | - | - | - | - | - | - |
| Pozi Countersunk Thread Rolling Screws | 7500M | - | - | - | - | - | - | - |
| Pozi Countersunk Twin Thread Wood Screws | - | - | 1210 | - | - | - | - | - |
| Pozi Countersunk Woodscrews | - | - | 1210 | - | - | - | - | - |
| Pozi Countersunk Woodscrews | 7997 | - | - | - | - | - | - | - |
| Pozi Raised Countersunk Machine Screws | 966Z | - | 450 / 57 | - | - | - | - | - |
| Pozi Raised Countersunk Woodscrews | 7995 | - | - | - | - | - | - | |
| Raised Countersunk Head Screws | - | - | 1981 / 450 | - | - | - | - | - |
| Slot Countersunk Machine Screws | 963 | - | - | - | - | - | - | - |
| Slot Countersunk Woodscrews | 97 | - | - | - | - | - | - | - |
| Slot Raised Countersunk Woodscrews | 95 | - | - | - | - | - | - | - |
| Slotted Countersunk Head Machine Screws | - | - | 4183 / 450 / 57 | - | - | - | - | - |
| Slotted Countersunk Head Screws | - | 2009 | - | - | - | - | - | - |
| Slotted Countersunk Head Wood Screws | - | - | 3692 | - | - | - | - | - |
| Slotted Flat Countersunk Head Cap Screws | - | - | - | - | B18.6.2 | - | - | - |
| Slotted Oval Countersunk Head Machine Screws | - | - | - | - | B18.6.3 | - | - | - |
| Slotted Raised Countersunk Head Machine Screws | - | - | 4183 | - | - | - | - | - |
| Slotted Raised Countersunk Head Screws | 924 / 964 | 2010 | - | - | - | - | - | - |
| Slotted Raised Countersunk Machine Screw | - | - | 57 | - | - | - | - | - |
| Slotted Raised Countersunk Oval Head Screws | - | 2342 | - | - | - | - | - | - |
| Slotted Undercut Flat Countersunk Head Machine Screws | - | - | - | - | B18.6.3 | - | - | - |
| Slotted Undercut Oval Countersunk Head Machine Screws | - | - | - | - | B18.6.3 | - | - | - |
| Socket Countersunk Screws | - | 10642 | 2470 | - | - | - | - | - |
| Spline Socket Flat Countersunk Head Cap Screws | - | - | - | - | B18.3 | - | - | - |
