Electro Hardware MS1031RM04F16F Round Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1031RM04F16F is a round, female unthreaded circuit board spacer machined from aluminum grade T-3 to QQ-A-225A Comp 2 specification. It is designed to maintain precise standoff distance between a printed circuit board and a mounting surface or stacked board assembly. The spacer accepts an M4 screw, measures 0.63 inches overall length (16 mm), and has an outside diameter of 0.24 inches (6 mm). The bore ranges from 0.165 to 0.189 inches (4.2 to 4.8 mm ID) with a length tolerance of plus or minus 0.005 inches. The bright uncoated finish leaves the aluminum in its natural state. Electronics technicians, PCB assemblers, and field service technicians handling control boards in HVAC, electrical, and industrial equipment install these spacers during board mounting and replacement work.

This spacer is suited for use in metric fastener assemblies where M4 hardware is specified. Typical applications include mounting control boards in HVAC equipment, electrical enclosures, motor drives, and other electronic assemblies that require a rigid, lightweight standoff. The female unthreaded body accepts a pass-through M4 screw, making it appropriate for through-bolt mounting configurations. Its aluminum construction keeps weight minimal while providing a stable, non-compressible standoff. The round body profile fits standard circular clearance holes found on most PCB and panel layouts.

Key Features

• Female unthreaded body accepts M4 pass-through screws
• Overall length of 0.63 inches (16 mm) with tight length tolerance of plus or minus 0.005 inches
• Outside diameter of 0.24 inches (6 mm) for a compact footprint
• Aluminum grade T-3 construction to QQ-A-225A Comp 2 fastener standard
• Bright uncoated finish — no coating to flake or interfere with electrical grounding contact
• Round body shape for use in standard circular clearance holes

Compatibility

Designed as an OEM-style metric spacer for M4 screw assemblies in PCB mounting applications across residential and commercial electronic control systems.

Installation Notes

Installation is performed by electronics technicians or qualified trades working on control board assemblies. Always de-energize the equipment and discharge any capacitors before handling circuit boards or fasteners. Use a calibrated torque driver appropriate for M4 hardware to avoid over-tightening, which can crack the board or deform the spacer. Verify spacer stack height against the PCB layout specification before final assembly.