M3 Thumb Screws, Flat Spade Head dimensions to Trade series (spade-head hand screw): coarse thread pitch 0.5 mm, clearance hole (ISO 273 medium) 3.4 mm, tapping drill 2.5 mm.
- Coarse thread pitch
- 0.5 mm
- Clearance hole (ISO 273 medium)
- 3.4 mm
- Tapping drill
- 2.5 mm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
M3 Thumb Screws, Flat Spade Head are manufactured to Trade series (spade-head hand screw). This page lists the controlling dimensions for the M3 size together with the installation notes for this type.
Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.
M3 Dimensional Row (Trade series (spade-head hand screw))
| Thread size | Pitch (mm) | Blade width dk (mm) | Blade height k (mm) | Blade thickness (mm) | Common length range (mm) | Material | Finish |
|---|
| M3 | 0.5 | 10 | 8 | 2.0 | 6~20 | Steel / A2 | Zinc / plain |
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 |
|---|
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.
Custom manufacturing · Made to drawing
Need thumb screws, flat spade head in a size this table does not list?
This page covers M3 thumb screws, flat spade head. A non-standard screw is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. 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 Thumb Screws
Where Thumb Screws are used, and what decides the specification in each case. Stocked from M3 to M8.
Industries that specify Thumb Screws
-
Photography & AV
Mounts and brackets set by hand.
-
Machine guarding
Covers opened by an operator without a tool.
-
Laboratory & test rigs
Clamps and panels adjusted during a run.
-
Laboratory & test equipment
Panels and clamps adjusted by hand during a run.
-
Machine guarding
Covers and guards opened by an operator without a tool.
-
Jigs & fixtures
Setups changed several times a shift.
Typical applications
- hand-tightened clamping
- assemblies adjusted many times a shift
- tool-free opening and closing of a panel or clamp
- adjustment that has to be made by hand while the machine runs
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.
Where to use something else
- Not for a joint that needs a defined clamp load; a hand-tightened screw carries only what a hand can produce.
Full application guide: where Thumb Screws are used, how to specify them, and the cases they are wrong for
