M6 is one of the standard coarse-thread sizes for hexalobular socket countersunk head screws, high head under ISO 14582. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
M6 Dimensional Row (ISO 14582)
| Size | Pitch P (mm) | a (mm) | b (mm) | Head diameter dk (mm) | csh_diam (mm) | csh_height (mm) | r (mm) | tt (mm) | A2 (mm) | t_mean (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M6 | 1.0 | 2.0 | 24.0 | 14.44 | 13.1 | 4.22 | 0.25 | T30 | 5.6 | 2.2 | 8~60 | ISO 14582 |
Spanner & Drive for M6 Hexalobular Socket Countersunk Head Screws, High Head
Drive geometry for M6 Hexalobular Socket Countersunk Head Screws, High Head is given by the row above; match the tool to the listed values.
Hole Sizes for M6
| Coarse-thread pitch (ISO 724) | 1 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 6.6 mm |
| Tapping drill, coarse thread | 5 mm |
Tightening Torque for M6
| Class 8.8 (dry, ~µ 0.125) | ≈ 10 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 15 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 17 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 M6
| Tensile stress area As (ISO 724) | 20.1 mm² |
|---|---|
| Proof load, class 8.8 | 12 kN |
| Proof load, class 10.9 | 17 kN |
| Proof load, class 12.9 | 20 kN |
| Min. ultimate tensile load, class 8.8 | 16 kN |
Proof load = tensile stress area × the proof stress Sp of the class, per ISO 898-1 — Sp is a lower figure than the yield stress Rp0.2 and the two are not interchangeable. The stress area is computed from this size's own diameter and pitch, so a fine-pitch designation gives the fine-pitch figure. Design the joint so the working preload stays below the proof load of the class selected.
M6 Hexalobular Socket Countersunk Head Screws, High Head Weight
A steel M6 hexalobular socket countersunk head screws, high head at the listed 860 mm length weighs approximately 1,106 g each — about 1,106 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.
Mating Parts for M6
For M6, pair with a M6 hex nut (ISO 4032 / DIN 934) and, where used, a M6 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
When to Step Up or Down from M6
When the joint preload approaches the proof load of M6 class 8.8, step up to M8 class 8.8 (or move to M6 class 10.9). When the joint is over-specified, M5 often saves weight and cost without losing the safety margin.
Custom manufacturing · Made to drawing
Need hexalobular socket countersunk head screws, high head in a size this table does not list?
This page covers M6 hexalobular socket countersunk head screws, high head. 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.
