M3.5 is one of the standard coarse-thread sizes for slotted terminal screws under DIN 84. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
M3.5 Dimensional Row (DIN 84)
| Thread size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Slot width n (mm) | Slot depth t (mm) | Common material | Common length range (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|
| M3.5 | 0.6 | 6.0 | 2.4 | 1.0 | 1.5 | Brass CW614N | 5~30 | DIN 84 |
Spanner & Drive for M3.5 Slotted Terminal Screws
Drive geometry for M3.5 Slotted Terminal Screws is given by the row above; match the tool to the listed values.
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.
M3.5 Slotted Terminal Screws Weight
A steel M3.5 slotted terminal screws at the listed 530 mm length weighs approximately 118 g each — about 118 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 M3.5 Slotted Terminal Screws
- 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 slotted terminal screws in a size this table does not list?
This page covers M3.5 slotted terminal 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.
