Electro Hardware MS1045M01F21F Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1045M01F21F is a round, female unthreaded circuit board spacer designed to maintain precise board-to-board or board-to-chassis standoff distances in electronic assemblies. Machined from brass and finished with a zinc plating that meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer accepts an M4 screw and measures 23 mm overall length with a 6 mm outside diameter. The inside diameter ranges from 4.2 to 4.8 mm, accommodating standard M4 hardware within close tolerances. It is a metric-dimensioned fastener component suited for PCB mounting applications across electronics manufacturing, control panel assembly, and field-service repairs in HVAC, electrical, and industrial equipment.

This spacer is used wherever a controlled standoff between a circuit board and a mounting surface is required. Typical applications include residential and commercial control board installations, industrial enclosure builds, and OEM electronics assembly. The brass construction resists corrosion in lightly humid environments, and the zinc finish adds an additional layer of surface protection. Technicians working on HVAC control boards, electrical panel assemblies, or similar PCB-mounted components will find this spacer a direct fit for M4 screw patterns requiring a 23 mm standoff height.

Key Features

• Brass base material with zinc plating meeting ASTM B633 and QQ-B-626 Comp 22 Type 1
• Female unthreaded body accepts M4 screw hardware
• 23 mm overall length with a tight length tolerance of -0.13 to 0.13 mm
• 6 mm outside diameter with 4.2 to 4.8 mm inside diameter range
• Round body shape for consistent seating on flat PCB surfaces
• Metric dimensioning for compatibility with M4 fastener systems

Compatibility

Designed for use with M4 screw hardware in metric PCB mounting and standoff applications across electronics assembly, control board installations, and industrial enclosure builds.

Installation Notes

Installation is performed by electronics technicians or electricians during board mounting or panel assembly. Always power down and de-energize the equipment fully before handling circuit boards or installing spacers near live components. Use appropriately sized M4 hardware to avoid stripping the spacer bore. Follow applicable NEC guidelines when installing or servicing control boards within electrical enclosures.