DIN 7991 M4 x 20 Countersunk Socket Screw
In stock in 15 material, grade and finish combinations.
Dimensions at M4 x 20
mm · DIN 7991 · 1986-01 · withdrawn| Dimension | Nominal | Min | Max | ISO 10642 | |
|---|---|---|---|---|---|
| d | Thread size | M4 | – | – | M4 |
| P | Thread pitch | 0.7 | – | – | 0.7 |
| l | Length | 20 | – | – | 20 |
| s | Hex socket size | 2.5 | – | – | 2.5 |
| dk | Head diameter | 8 | – | – | 7.53 |
| k | Head height | 2.3 | – | – | 2.48 |
- ISO 10642
- Values in bold differ from DIN 7991.
- Length incl. head
- 20 mm · 19.58–20.42 mm to DIN 7991 product grade A
- Approx. weight
- ≈ 1.90 kg per 1 000 pieces · Bare steel, before coating and packing.526 pieces per kg
Holes for this thread
ISO 273 · ISO 2306Clearance hole · fine4.3 mm
Clearance hole · medium4.5 mm
Clearance hole · coarse4.8 mm
Tap drill3.3 mm
