Nylon Hex Standoff M4×40mm Female-Female PCB Spacer 10-Pack

Nylon Hex Standoff M4×40mm — Female-Female PCB Spacer, 10-Pack

M4×40mm nylon hex female-female standoffs are the tallest standard nylon standoff in the M4 range, providing 40mm of PCB clearance height for large multi-board stacking configurations, tall electronics enclosures, and applications requiring maximum inter-board spacing for cable management, cooling, or large component clearance. M4 thread is essential at this height for structural rigidity.

Key Specifications

Why Choose M4×40mm Nylon Standoffs?

• 40mm maximum clearance — the tallest standard M4 nylon standoff; provides maximum inter-board spacing for large cable harnesses, cooling fans, and tall component stacks
• M4 essential at 40mm — M4 thread is required at this height for structural rigidity; M3 standoffs at 40mm would be structurally inadequate for most applications
• Female-female configuration — both ends accept M4 screws for flexible mounting
• Electrically non-conductive — PA66 nylon eliminates short circuit risk between boards and mounting surfaces
• Lightweight — nylon construction for weight-critical applications

Typical Applications

• Large multi-board electronics enclosure stacking (40mm inter-board spacing)
• Industrial control panel with multiple PCB layers and cable harness routing
• Power electronics enclosure with cooling fan between boards
• Custom electronics project enclosure with maximum component height
• Test and measurement equipment multi-board assembly
• Prototype electronics enclosure requiring maximum flexibility

Compatible With

• M4 machine screws for PCB and base panel attachment
• M4 hex nuts, nyloc nuts, and flat washers
• 
  PCB mounting holes: standard 4.3mm clearance drill
• Can be combined with M4×20mm or M4×30mm standoffs for intermediate heights

Package Contents

• 10× M4×40mm nylon hex female-female standoffs

Frequently Asked Questions

Q: Should I use nylon or brass standoffs at 40mm height?

A: At 40mm height, brass standoffs provide significantly better rigidity and load capacity than nylon. Choose nylon M4×40mm when: (1) electrical isolation is required, (2) weight is critical, or (3) the application is non-structural (light PCBs, no vibration). Choose brass M4×40mm when: (1) structural rigidity is critical, (2) the PCB is heavy, or (3) the application involves vibration or dynamic loads.

Q: Can I stack two M4×20mm standoffs to get 40mm?

A: Yes, but a single M4×40mm standoff is more rigid and reliable than two stacked M4×20mm standoffs. Stacking introduces an additional joint that can flex and loosen over time. Use a single 40mm standoff whenever possible.

Q: What is the maximum PCB weight these standoffs can support?

A: PA66 nylon M4×40mm standoffs can support several hundred grams of PCB weight in compression. However, at 40mm height, lateral (bending) loads are the limiting factor. For PCBs heavier than 200g or applications with vibration, use brass or aluminium standoffs for better structural performance.