Set Screw Spec Table
A headless screw threaded along its full length, used to secure shafts, collars, and gears. Holding force varies by tip type (flat, cone, ball, etc.).
Practical Notes
- Tip types: flat→hardened shafts, cone→positioning, cup→soft shaft marking. Wrong selection drastically reduces holding.
- Insufficient torque causes loosening during rotation. Combine with medium-strength threadlocker for much better retention.
Selection Guide
Used to lock gears, pulleys, or collars onto shafts. Headless design sits flush. Tip type determines use: flat point for hardened shafts, cone point for positioning, cup point for gripping soft shafts. Transmits less torque than keys, so limit to axial retention and light rotational locking.
Set ScrewISOJISDINSet Screw
7 sizesThe dimensions below are identical across ISO 4026 · JIS B 1177 · DIN 913.
| Nominal | d | P | Head Dia | Wrench | Other |
|---|---|---|---|---|---|
| M3 | 3 | 0.5 | - | - | 1.5 |
| M4 | 4 | 0.7 | - | - | 2 |
| M5 | 5 | 0.8 | - | - | 2.5 |
| M6 | 6 | 1 | - | - | 3 |
| M8 | 8 | 1.25 | - | - | 4 |
| M10 | 10 | 1.5 | - | - | 5 |
| M12 | 12 | 1.75 | - | - | 6 |
Key Features
- Headless design with zero axial protrusion; dedicated to locking rotating parts
- Tip geometry (flat, cone, cup, dog point) determines holding characteristics
- KS B 1028 / ISO 4026–4029; hex socket drive M3–M24
Key Applications
Shaft-gear locking, coupling set screws, knob/handle positioning, pulley setting, adjustable stops
FAQ
What are set screw tip types and uses?
Flat→hardened shafts, Cone→positioning, Cup→marking soft shafts for strong hold, Ball→surface protection, Dog point→permanent fixing. Select tip by application.