ISO 7053 ST8 x 25 Washer Head Tapping Screw
In stock in 5 material, grade and finish combinations.
Dimensions at ST8 x 25
mm · ISO 7053 · 2019 edition| Dimension | Nominal | Min | Max | DIN 6928 | |
|---|---|---|---|---|---|
| d | Thread size | ST8 | – | – | ST8 |
| P | Thread pitch | 2.1 | – | – | 2.1 |
| l | Length | 25 | – | – | 25 |
| a | Thread runout | – | – | 2.1 | 2.1 |
| c | Washer height | – | 1.2 | – | 1.2 |
| da | Underhead diameter | – | – | 9.2 | — |
| dc | Flange diameter | 18 | – | – | 18 |
| dc | Bearing diameter | – | 16.7 | – | 16.7 |
| e | Width across corners | – | 14.26 | – | 14.26 |
| k | Head height | 7 | 6.4 | – | 6.4 |
| kw | Wrenching height | – | 3.3 | – | 3.3 |
| r1 | Radius r1 | – | 0.4 | – | — |
| r2 | Radius r2 | – | – | 0.6 | 0.6 |
| s | Width across flats | – | 12.73 | 13 | 12.73–13 |
| y | Point length (ref.) (C) | 7.5 | – | – | 7.5 |
| y | Point length (ref.) (F) | 4.2 | – | – | 4.2 |
| y | Point length (ref.) (R) | 6.3 | – | – | — |
- DIN 6928
- Values in bold differ from ISO 7053.
- Length under head
- 25 mm · 24.2–25.8 mm (Type C / R), 23.7–25 mm (Type F) to ISO 7053 product grade A
- Approx. weight
- ≈ 13.60 kg per 1 000 pieces · Bare steel, before coating and packing.73.5 pieces per kg
- Also named
- GB/T 16824.1