ISO 7051 ST5.5 x 25 Tapping Screw
In stock in 7 material, grade and finish combinations.
Dimensions at ST5.5 x 25
mm · ISO 7051 · 2011 edition| Dimension | Nominal | Min | Max | |
|---|---|---|---|---|
| d | Thread size | ST5.5 | – | – |
| P | Thread pitch | 1.8 | – | – |
| l | Length | 25 | – | – |
| a | Thread runout | – | – | 3.6 |
| dk | Theoretical head diameter | 10.3 | 9.9 | 11.5 |
| k | Head height | 3 | – | – |
| r | Radius | – | – | 2.2 |
| Recess number | 3 | – | – | |
| m | Type H recess width (ref) | 6.6 | – | – |
| Type H penetration | – | 2.8 | 3.3 | |
| m | Type Z / socket width (ref) | 6.3 | – | – |
| Type Z penetration | – | 2.73 | 3.18 | |
| y | Point length (ref.) (C) | 5 | – | – |
| y | Point length (ref.) (F) | 3.6 | – | – |
| y | Point length (ref.) (R) | 4.3 | – | – |
| f | Raised head height (ref) | 1.3 | – | – |
| rf | Head radius (ref) | 11 | – | – |
- 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
- ≈ 4.17 kg per 1 000 pieces · Bare steel, before coating and packing.240 pieces per kg
- Also named
- GB/T 847