M3 Pan Head Screws dimensions to ISO 7045 / DIN 7985: head diameter 5.6 mm, head height 1.8 mm, coarse thread pitch 0.5 mm, clearance hole (ISO 273 medium) 3.4 mm. Tighten to approximately 1.3 Nm at property class 8.8 in a dry, as-supplied condition.
- Head diameter
- 5.6 mm
- Head height
- 1.8 mm
- Coarse thread pitch
- 0.5 mm
- Clearance hole (ISO 273 medium)
- 3.4 mm
- Tightening torque (class 8.8)
- 1.3 Nm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
M3 Pan Head Screws are manufactured to ISO 7045 / DIN 7985 with a coarse thread pitch of 0.5 mm. This page lists the controlling dimensions for the M3 size — head geometry, width across flats, matching spanner size — together with the clearance hole, tapping drill and tightening torque used at assembly.
M3 Dimensional Row (ISO 7045 / DIN 7985)
| Size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Cross recess | Reference standard |
|---|
| M3 | 0.5 | 5.6 | 1.8 | PH1 | ISO 7045 / DIN 7985 |
Spanner & Drive for M3 Pan Head Screws
M3 Pan Head Screws use a PH1 cross recess. Match the driver bit to the recess (Phillips PH / Pozi PZ are NOT interchangeable).
Hole Sizes for M3
| Coarse-thread pitch (ISO 724) | 0.5 mm |
|---|
| Through-hole / clearance (ISO 273 medium) | 3.4 mm |
|---|
| Tapping drill, coarse thread | 2.5 mm |
|---|
Tightening Torque for M3
| Class 8.8 (dry, ~µ 0.125) | ≈ 1.3 Nm |
|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ Nm |
|---|
| Class 12.9 (dry, ~µ 0.125) | ≈ 2.2 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
| Tensile stress area As (ISO 724) | 5 mm² |
|---|
| Proof load, class 8.8 | 2.9 kN |
|---|
| Proof load, class 12.9 | 4.9 kN |
|---|
| Min. ultimate tensile load, class 8.8 | 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.
Mating Parts for M3
For M3, pair with a M3 hex nut (ISO 4032 / DIN 934) and, where used, a M3 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
When to Step Up or Down from M3
When the joint preload approaches the proof load of M3 class 8.8, step up to M4 class 8.8 (or move to M3 class 10.9). When the joint is over-specified, M2 often saves weight and cost without losing the safety margin.
Custom manufacturing · Made to drawing
Need pan head screws in a size this table does not list?
This page covers M3 pan head 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.
Custom screw manufacturingSend a drawing
Applications & Industries for M3 Pan Head Screws
Where Pan Head Screws are used, and what decides the specification in each case. Stocked from M1 to M10.
Industries that specify Pan Head Screws
-
Machine building & OEM
The default fastener on production equipment: covers, brackets, motor mounts and sub-assemblies tightened to a specified torque.
-
Automotive & transport
Chassis, driveline and body fixings that see vibration and are assembled to a controlled preload.
-
Steel fabrication
Bolted connections in frames, enclosures, walkways and weldments, on the bench and on site.
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Energy & infrastructure
Tower, pipework, switchgear and plant fixings specified for long service life and inspectable joints.
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Maintenance & MRO
Stocked replacements matched to an existing property class, thread and finish.
-
Food, pharma & cleanroom
Stainless assemblies that are washed down, where the finish matters as much as the strength.
Typical applications
- clamping two machined faces to a calculated preload
- bolting brackets, motors and gearboxes to a frame
- assemblies that are dismantled for service and re-torqued
- joints where the property class is stated on the drawing
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- High load
- Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- Torque and preload
- The joint is designed around bolt tension, so lubrication, coating and the friction coefficient all change the torque figure — state them together.
Where to use something else
- Do not use a machine thread into unthreaded sheet or timber; use a tapping screw, rivet nut or insert made for that parent material.
Full application guide: where Pan Head Screws are used, how to specify them, and the cases they are wrong for
