Project Description
Hex washer head self drilling screw
Hex washer head self drilling screw with washer face provides a bearing surface, which could protect the connecting surface. Hex washer head self drilling screw is for metal to metal applications, mostly for roofing to metal frames fastening. For outdoor applications, S-metal offers hex washer head drilling screw with E.P.D.M washer, which offers sealing functions to resistant water leaks.
Standards:DIN 7504 K,ISO 15480, SAE J78.
Material :Case hardened steel C 1018,C 1022 with heat-treated
Stainless steel 304/316/410.
Surface:zinc plated, H.D.G, Black phosphated.
Surface hardness:The minimum surface hardness of self drilling screws after heat treatment shall be 530 HV.
Core hardness:The core hardness after heat treatment shall be 320 HV to 400 HV.
Tolerance: Grade A conforming to ISO 4759-1.
DIN 7504K hex washer head self drilling screw
Dimension in mm.
| Size d | P | dc | h min | s | k | L | |||
| max | min | max | min | max | min | ||||
| ST2.9 | 1.1 | 6.3 | 5.8 | 0.4 | 4 | 3.82 | 2.8 | 2.5 | 13-50 |
| ST3.5 | 1.3 | 8.3 | 7.6 | 0.6 | 5.5 | 5.32 | 3.4 | 3 | |
| ST3.9 | 1.3 | 8.3 | 7.6 | 0.6 | 5.5 | 5.32 | 3.4 | 3 | |
| ST4.2 | 1.4 | 8.8 | 8.1 | 0.8 | 7 | 6.78 | 4.1 | 3.6 | 16-100 |
| ST4.8 | 1.6 | 10.5 | 9.8 | 0.9 | 8 | 7.78 | 4.3 | 3.8 | |
| ST5.5 | 1.8 | 11 | 10 | 1 | 8 | 7.78 | 5.4 | 4.8 | |
| ST6.3 | 1.8 | 13.5 | 12.2 | 1 | 10 | 9.78 | 5.9 | 5.3 | 32-200 |
| ST8 | 2.1 | 18 | 16.7 | 1.2 | 13 | 12.73 | 7 | 6.4 | |
