ISO 14579 M20 x 55 Socket Head Cap Screw
In stock in 10 material, grade and finish combinations.
Dimensions at M20 x 55
mm · ISO 14579 · 2011 edition| Dimension | Nominal | Min | Max | |
|---|---|---|---|---|
| d | Thread size | M20 | – | – |
| P | Thread pitch | 2.5 | – | – |
| l | Length | 55 | – | – |
| dk | Head diameter | 30 | 29.67 | – |
| k | Head height | 20 | 19.48 | – |
| b | Thread length | 52 | – | – |
| r | Radius | – | 0.8 | – |
| Recess number | 90 | – | – | |
| A | Hexalobular socket A (ref) | 20.2 | – | – |
| t | Socket depth | – | 8.69 | 9.2 |
- Length under head
- 55 mm · 54.4–55.6 mm to ISO 14579 product grade A
- Approx. weight
- ≈ 207.62 kg per 1 000 pieces · Bare steel, before coating and packing.4.8 pieces per kg
Holes for this thread
ISO 273 · ISO 2306Clearance hole · fine21 mm
Clearance hole · medium22 mm
Clearance hole · coarse24 mm
Tap drill17.5 mm
