*USED* Screw M4x40-Hexagon socket head

This used M4x40 hex socket head screw is a compact, high-torque fastener designed for tight spaces where an Allen drive excels. With an M4 diameter and 40 mm length, it’s a familiar choice for electronics enclosures, light-duty machinery, and hobbyist builds where precise fit and dependable clamping matter.

Key details at a glance

• Hex socket head (Allen) for easy, confident tightening with a hex key
• M4 diameter, 40 mm long
• M4 coarse thread (standard 0.7 mm pitch) for reliable engagement in tapped holes or inserts
• USED — may show minor cosmetic wear; threads have been inspected for functional integrity
• Ideal for lightweight frames, 3D printer assemblies, electronics housings, and DIY repair projects where space is limited

Why choose a used M4x40 hex socket head screw

• Cost-effective option for non-critical or non-load-bearing applications without compromising on fit or performance
• Great for spares and replacements in ongoing projects, where you need reliable M4 fasteners that won’t over-commit your budget
• Standardized dimensions mean seamless compatibility with M4 nuts, threaded inserts, and compatible tapped holes

Practical tips for use

• Pair with a correctly sized hex key (typically 2.5 mm for M4 hex socket screws) to achieve consistent torque
• Inspect threads before reuse; clean any debris and apply a light anti-seize lubricant to ease future removals
• Use in conjunction with appropriate backing hardware (nuts or inserts) to prevent thread wear in softer materials
• Best for assemblies where the screw is not bearing critical loads or where the aesthetic of a uniform, recessed drive is desired

Whether you’re outfitting a compact electronics project, reinforcing a lightweight framework, or simply stocking up on common fasteners, this USED M4x40 hex socket head screw provides a dependable, economical option. It’s a practical choice for makers and technicians who value consistent sizing, ease of installation, and the versatility of a standard hex socket drive.