M3.5 Phillips Countersunk Screws (ISO 7046 / DIN 965) are specified by thread size, length and head dimensions. The M3.5 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M3.5 Dimensional Row (ISO 7046 / DIN 965)
| Size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Cross recess | Countersink angle (deg) | Reference standard |
|---|---|---|---|---|---|---|
| M3.5 | 0.6 | 6.5 | 1.93 | PH2 | 90 | ISO 7046 / DIN 965 |
Spanner & Drive for M3.5 Phillips Countersunk Screws
The hex socket for M3.5 Phillips Countersunk Screws 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 M3.5
| Coarse-thread pitch (ISO 724) | 0.6 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 3.9 mm |
| Tapping drill, coarse thread | 2.9 mm |
Tightening Torque for M3.5
| Class 8.8 (dry, ~µ 0.125) | ≈ 2 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 3.4 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 M3.5
| Tensile stress area As (ISO 724) | 6.8 mm² |
|---|---|
| Proof load, class 8.8 | 3.9 kN |
| Proof load, class 12.9 | 6.6 kN |
| Min. ultimate tensile load, class 8.8 | 5.4 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.
Installation Tips for M3.5 Phillips Countersunk Screws
- 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 M3.5 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 M3.5
For M3.5, pair with a M3.5 hex nut (ISO 4032 / DIN 934) and, where used, a M3.5 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need phillips countersunk screws in a size this table does not list?
This page covers M3.5 phillips countersunk screws. Where the standard stops, the drawing takes over: fine pitches, left-hand threads, partial threading, and property classes above the catalogued grade where material and heat treatment allow. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
