Dimensional and assembly data for M2 Slotted Oval Countersunk Head Machine Screws to ISO 2010. 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.
M2 Dimensional Row (ISO 2010)
| Size | Pitch P (mm) | a (mm) | b (mm) | Head diameter dk (mm) | csh_diam (mm) | csh_height (mm) | n_min (mm) | r (mm) | t_mean (mm) | x (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M2 | 0.4 | 0.8 | 25 | 4.4 | 3.6 | 1.2 | 0.56 | 0.3 | 0.5 | 1.0 | 3~20 | ISO 2010 |
Spanner & Drive for M2 Slotted Oval Countersunk Head Machine Screws
Drive geometry for M2 Slotted Oval Countersunk Head Machine Screws is given by the row above; match the tool to the listed values.
Hole Sizes for M2
| Coarse-thread pitch (ISO 724) | 0.4 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 2.4 mm |
| Tapping drill, coarse thread | 1.6 mm |
Tightening Torque for M2
| Class 8.8 (dry, ~µ 0.125) | ≈ 0.3 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 0.6 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 M2
| Tensile stress area As (ISO 724) | 2.1 mm² |
|---|---|
| Proof load, class 8.8 | 1.2 kN |
| Proof load, class 12.9 | 2 kN |
| Min. ultimate tensile load, class 8.8 | 1.7 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.
M2 Slotted Oval Countersunk Head Machine Screws Weight
A steel M2 slotted oval countersunk head machine screws at the listed 320 mm length weighs approximately 38 g each — about 38 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 M2 Slotted Oval Countersunk Head Machine Screws
- At M2 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for M2
For M2, pair with a M2 hex nut (ISO 4032 / DIN 934) and, where used, a M2 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need slotted oval countersunk head machine screws in a size this table does not list?
This page covers M2 slotted oval countersunk head machine screws. Head form and drive can be specified to the assembly rather than to a standard: a larger bearing face, a security drive, or a socket sized for the tool already on the bench. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
