M3 / M4 PC Case Thumbscrew — Carbon Steel Phillips Round Head, Hand-Tighten

The go-to fastener for tool-free PC case assembly and panel access. These carbon steel thumbscrews feature a knurled or wide round head for comfortable finger-tightening, eliminating the need for a screwdriver when opening and closing PC cases, side panels, and drive bays. Available in M3 and M4 thread sizes with black zinc plating (black) or nickel plating (silver) to match your build aesthetic.

Specifications

Material	Carbon Steel
Surface Finish	Black zinc plated (black) / Nickel plated (silver)
Drive Style	Phillips (cross) + hand-tighten head
Head Style	Round (pan) head
Thread Sizes	M3 (3mm) / M4 (4mm)
Thread Lengths	6mm / 8mm / 10mm / 12mm / 15mm
Screw Type	Thumb Screw (machine thread)
Origin	Mainland China

Size Reference

Thread	Diameter	Available Lengths	Common Use
M3	3mm	6 / 8 / 10 / 12 / 15mm	PC case panels, drive bays, fan mounts
M4	4mm	6 / 8 / 10 / 12 / 15mm	Heavier panels, server chassis, enclosures

Why Choose These Thumbscrews?

✅ Tool-free installation — hand-tighten and loosen without a screwdriver for quick panel access
✅ Phillips drive backup — use a screwdriver for extra torque when needed
✅ Carbon steel strength — durable, won’t strip under normal use
✅ Two finish options — black zinc for stealth builds, nickel silver for classic looks
✅ M3 and M4 options — covers the two most common PC case thread standards
✅ Multiple lengths — 6–15mm to match various panel thicknesses