Electro Hardware MS1011M04F16F Round Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1011M04F16F is a round, female unthreaded circuit board spacer designed to maintain precise standoff distance between a PCB and a mounting surface or secondary board. Machined from aluminum grade T3 and conforming to fastener standard QQ-A-225A Comp 2, this spacer accepts an M4 screw and delivers a consistent 6 mm overall length. The bore accommodates an inside diameter range of 4.2 to 4.8 mm, with an outside diameter of 6 mm. The bright, uncoated finish leaves the aluminum surface bare, making it suitable for applications where conductivity or minimal surface interference is acceptable. Electronics assembly technicians and field service professionals working on control boards in HVAC, electrical, and industrial equipment will encounter this style of spacer in standard PCB mounting configurations.

This spacer is used in electronic subassembly work wherever an M4-compatible standoff is required to separate circuit boards from enclosure bases, DIN-rail mounted controls, or stacked PCB assemblies. Common applications include control board mounting in residential and light commercial HVAC equipment, electrical panel subassemblies, and general electronics manufacturing or repair. Its metric dimensions make it appropriate for equipment designed to metric fastener standards. The unthreaded female body accepts a pass-through or threaded fastener from above, providing a clean, rigid mount point.

Key Features

• Female unthreaded round body accepts M4 screws for straightforward PCB standoff mounting
• 6 mm overall length with a tight length tolerance of -0.13 to 0.13 mm for consistent board spacing
• Inside diameter range of 4.2 to 4.8 mm accommodates standard M4 fastener shanks
• 6 mm outside diameter in a compact round profile minimizes board footprint
• Aluminum grade T3 construction per QQ-A-225A Comp 2 for lightweight, corrosion-resistant performance
• Bright uncoated finish — no coating thickness to account for in tight-tolerance assemblies

Compatibility

Designed as an OEM-style replacement or assembly component for circuit board mounting applications requiring an M4 metric screw size and a 6 mm standoff height in a round aluminum spacer configuration.

Installation Notes

Installation is typically performed by electronics assembly technicians or field service personnel working on control board subassemblies. Power down and de-energize all circuits before handling or replacing circuit board hardware. Fasten to the recommended M4 torque specification for the host assembly as defined by the equipment manufacturer — do not over-tighten, as aluminum spacers can deform under excessive clamping load. Follow applicable IPC assembly standards and the host equipment manufacturer guidelines when integrating spacers into PCB mounting schemes.