This page covers M8 Soft-Tip Set Screws (Nylon and Brass) to Trade series (soft-tip set screw): the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (Trade series (soft-tip set screw) together with ISO 273, ISO 724 and ISO 898-1 where applicable).
M8 Dimensional Row (Trade series (soft-tip set screw))
| Thread size | Tip material | Tip length (mm) | Holding force vs steel point | Max temperature (u00b0C) | Drive | Common length range (mm) | Marks the shaft |
|---|---|---|---|---|---|---|---|
| M8 | Brass | 4.0 | approx. 70% | 250 | Hex socket | 10~40 | No |
Spanner & Drive for M8 Soft-Tip Set Screws (Nylon and Brass)
The hex socket for M8 Soft-Tip Set Screws (Nylon and Brass) is shown in the spec table — use the matching Allen / hex key (an ISO 2936 hex key set covers the full range). Ball-end keys are for reaching the screw, not for tightening it — finish on the plain end, and on production work use a torque-controlled driver.
Hole Sizes for M8
| Coarse-thread pitch (ISO 724) | 1.25 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 9 mm |
| Tapping drill, coarse thread | 6.8 mm |
Tightening Torque for M8
| Class 8.8 (dry, ~µ 0.125) | ≈ 25 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 35 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 41 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Proof Load & Strength for M8
| Tensile stress area As (ISO 898-1) | 36.6 mm² |
|---|---|
| Proof load, class 8.8 | 21 kN |
| Proof load, class 10.9 | 30 kN |
| Proof load, class 12.9 | 36 kN |
| Min. ultimate tensile, class 8.8 | 29 kN |
Proof load = stress area × proof stress per ISO 898-1. Design joints so the working preload stays below the proof load of the selected class.
M8 Soft-Tip Set Screws (Nylon and Brass) Weight
A steel M8 soft-tip set screws (nylon and brass) at the listed 4 mm length weighs approximately 1.6 g each — about 1.6 kg per 1,000 pieces. Stainless A2/A4 weighs roughly the same (density 7.9–8.0 g/cm³).
Actual weight varies slightly with head form, thread and finish; use this figure for freight estimation only.
Installation Tips for M8 Soft-Tip Set Screws (Nylon and Brass)
- Use a quality Allen key fully seated in the socket — partial engagement is the most common cause of stripped sockets at this size.
- For countersunk and button-head variants, chamfer the through-hole to seat the head flush without preloading the head/shank fillet.
Mating Parts for M8
For M8, pair with a M8 hex nut (ISO 4032 / DIN 934) and, where used, a M8 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
