Dimensional and assembly data for M4 Soft-Tip Set Screws (Nylon and Brass) to Trade series (soft-tip set screw). Includes head size and width across flats, clearance-hole and tapping-drill diameters, tightening torque per property class, and the sizes to step up or down to when the joint requires it.
M4 Dimensional Row (Trade series (soft-tip set screw))
| Thread size | Tip material | Tip length (mm) | Holding force vs steel point | Max temperature (°C) | Drive | Common length range (mm) | Marks the shaft |
|---|---|---|---|---|---|---|---|
| M4 | Nylon 6/6 | 2.0 | approx. 40% | 100 | Hex socket | 6~20 | No |
Spanner & Drive for M4 Soft-Tip Set Screws (Nylon and Brass)
The hex socket for M4 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). For a one-off, a T-handle key and a calibrated arm will do. For a batch, the only way to get the same preload twice is a torque-controlled driver.
Hole Sizes for M4
| Coarse-thread pitch (ISO 724) | 0.7 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 4.5 mm |
| Tapping drill, coarse thread | 3.3 mm |
Tightening Torque for M4
| Class 8.8 (dry, ~µ 0.125) | ≈ 2.9 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 5 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 M4
Set screws are rated to ISO 898-5 by hardness, because they work in compression against a shaft rather than in tension. ISO 898-1 excludes them, and a set screw has no head to preload against, so neither a property class nor a preload torque applies. Seating torque depends on the point form and the shaft material.
M4 Soft-Tip Set Screws (Nylon and Brass) Weight
A steel M4 soft-tip set screws (nylon and brass) at the listed 2 mm length weighs approximately 0.2 g each — about 0.2 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 M4 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.
- At M4 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
When to Step Up or Down from M4
When the joint preload approaches the proof load of M4 class 8.8, step up to M5 class 8.8 (or move to M4 class 10.9). When the joint is over-specified, M3 often saves weight and cost without losing the safety margin.
Custom manufacturing · Made to drawing
Need soft-tip set screws (nylon and brass) in a size this table does not list?
This page covers M4 soft-tip set screws (nylon and brass). Lengths and thread lengths outside the standard table are the commonest request, followed by a drive the standard does not offer and a head marked with your own part number. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
