M3-0.5 A2 / 18-8 Stainless Steel Semi-Flanged Knurled-Head Thumb Nut
$1.69
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M3 × 0.5 stainless thumb nut for hand-adjusted printer hardware. A compact semi-flanged knurled-head nut with an 8 mm head diameter, made from A2 / 18-8 stainless steel for corrosion-resistant, tool-free adjustment.
Why use this over a hex nut?
- Tool-free grip: the knurled outer head is made to turn by hand, useful for covers, brackets, tensioners, fixtures, and parts that come on and off often.
- Small footprint: thumb nuts fit tighter spaces than wing nuts while still giving more finger purchase than a standard M3 hex nut.
- Semi-flanged face: the raised shoulder/flange gives a broader bearing surface than the knurled body alone.
- A2 / 18-8 stainless: suitable for damp shop environments and printer enclosures where plain steel hardware can rust.
Specifications
- Thread: M3 × 0.5 mm, right-hand internal thread
- Head style: knurled thumb nut with semi-flanged/shouldered face
- Head diameter: 8 mm
- Material: A2 / 18-8 stainless steel
- Sold as: single thumb nut
Intended use
Use anywhere a 3D-printer mod, fixture, cover, or small assembly needs an M3 nut that can be loosened and tightened by hand instead of with a wrench.
Gotchas
- This is a nut, not a screw or bolt; pair it with an M3 screw, stud, or threaded rod.
- It is stainless, not black oxide and not brass.
- It is not a locking nut; use threadlocker or a locknut where vibration resistance is required.
