ISO 7051 ST4.2 x 25 Tapping Screw
In stock in 7 material, grade and finish combinations.
Dimensions at ST4.2 x 25
mm · ISO 7051 · 2011 edition| Dimension | Nominal | Min | Max | |
|---|---|---|---|---|
| d | Thread size | ST4.2 | – | – |
| P | Thread pitch | 1.4 | – | – |
| l | Length | 25 | – | – |
| a | Thread runout | – | – | 2.8 |
| dk | Theoretical head diameter | 8.4 | 8 | 9.4 |
| k | Head height | 2.6 | – | – |
| r | Radius | – | – | 1.6 |
| Recess number | 2 | – | – | |
| m | Type H recess width (ref) | 4.6 | – | – |
| Type H penetration | – | 2.1 | 2.6 | |
| m | Type Z / socket width (ref) | 4.4 | – | – |
| Type Z penetration | – | 2.06 | 2.51 | |
| y | Point length (ref.) (C) | 3.7 | – | – |
| y | Point length (ref.) (F) | 2.8 | – | – |
| y | Point length (ref.) (R) | 3.2 | – | – |
| f | Raised head height (ref) | 1 | – | – |
| rf | Head radius (ref) | 9.5 | – | – |
- Length to top of countersink
- 25 mm · 24.2–25.8 mm (Type C / R), 23.7–25 mm (Type F) to ISO 7051 product grade A
- Approx. weight
- ≈ 2.38 kg per 1 000 pieces · Bare steel, before coating and packing.421 pieces per kg
- Also named
- GB/T 847