ISO 1479 ST8 x 25 Hex Head Tapping Screw
In stock in 4 material, grade and finish combinations.
Dimensions at ST8 x 25
mm · ISO 1479 · 2011 edition| Dimension | Nominal | Min | Max | GB/T 5285 | |
|---|---|---|---|---|---|
| d | Thread size | ST8 | – | – | ST8 |
| P | Thread pitch | 2.1 | – | – | 2.1 |
| l | Length | 25 | – | – | 25 |
| a | Thread runout | – | – | 2.1 | 2.1 |
| s | Width across flats | – | 12.73 | 13 | 12.73–13 |
| e | Width across corners | – | 14.26 | – | 14.26 |
| k | Head height | 6 | 5.2 | – | 5.2 |
| r | Radius | – | 0.4 | – | 0.4 |
| 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 | – | – | 6.3 |
- GB/T 5285
- Values in bold differ from ISO 1479.
- Length under head
- 25 mm · 24.2–25.8 mm (Type C / R), 23.7–25 mm (Type F) to ISO 1479 product grade A
- Approx. weight
- ≈ 13.48 kg per 1 000 pieces · Bare steel, before coating and packing.74.2 pieces per kg
- Also named
- GB/T 5285