Electro Hardware MS1023M01F21F Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1023M01F21F is a round, female unthreaded circuit board spacer designed to create precise standoff clearance between a PCB and a mounting surface or secondary board. Built from brass with a zinc-plated finish meeting ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer delivers solid corrosion resistance in electronics assembly environments. It accepts an M4 screw, measures 12 mm overall length, and has an outside diameter of 6 mm with an inside diameter ranging from 4.2 to 4.8 mm. Electronics assemblers, PCB technicians, and electrical enclosure builders use this type of hardware in both production and field service applications.

This spacer is suited for metric-fastener PCB mounting applications where consistent standoff height and reliable electrical isolation between board layers are required. Its compact 6 mm outside diameter fits standard board mounting hole patterns. The brass base material with zinc plating resists oxidation and maintains conductivity where chassis grounding through the standoff is part of the design. Typical use cases include control board assemblies, industrial enclosures, HVAC control boards, and general electronics cabinetry requiring M4 metric hardware.

Key Features

• Female unthreaded body accepts M4 screw for secure, repeatable standoff mounting
• Brass construction with zinc-plated finish meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• 12 mm overall length with a tight length tolerance of -0.13 to 0.13 mm for consistent stack height
• 6 mm outside diameter fits standard metric PCB mounting footprints
• Inside diameter range of 4.2 to 4.8 mm with tolerance of 0.000 to 0.270 mm
• Round body shape simplifies alignment and installation in tight board layouts

Compatibility

Designed as a metric-standard M4 round circuit board spacer for use in PCB assemblies, control board enclosures, and electronics mounting applications requiring a female unthreaded standoff with a 6 mm outside diameter and 12 mm overall length.

Installation Notes

Installation is performed by electronics technicians or electricians during board assembly or enclosure build-out. Discharge any static and power down the assembly before handling PCBs or installing standoffs. Use an appropriately sized M4 driver and avoid overtightening, which can crack the board or strip the standoff bore. Follow applicable IPC standards for PCB assembly hardware when working in production environments.