Electro Hardware MS1001M01F21F Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1001M01F21F is a round, female unthreaded circuit board spacer designed for M4 screw applications in printed circuit board assemblies. Manufactured from brass and finished with a zinc plating that meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer provides reliable electrical isolation and mechanical standoff between a board and a mounting surface. The overall length is 1 mm, the outside diameter is 6 mm, and the inside diameter ranges from 4.2 mm to 4.8 mm. It is a metric-dimensioned fastener hardware component installed by electronics assembly technicians, PCB service professionals, and industrial maintenance personnel.

This spacer is suited for use in commercial and industrial PCB assembly environments where a low-profile, metric standoff is required. The compact 1 mm OAL makes it appropriate for tight board stack applications where minimal clearance is needed between the circuit board and the mounting substrate. The zinc plating provides corrosion resistance in standard indoor environments. The female unthreaded bore accepts M4 fasteners, making it compatible with common metric hardware used across HVAC control boards, industrial control panels, and electronic enclosures.

Key Features

• Brass construction with zinc plating meeting ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• Female unthreaded bore sized for M4 screw applications
• 1 mm overall length for low-profile board standoff applications
• Inside diameter range of 4.2 mm to 4.8 mm with a tolerance of 0.000 to 0.270 mm
• Round body shape with 6 mm outside diameter for consistent seating on PCB mounting pads
• Metric dimensioned hardware suitable for international and domestic PCB assemblies

Compatibility

Designed as an OEM-style replacement or supplemental hardware component for circuit board assemblies requiring a metric M4 female unthreaded round spacer with a 1 mm standoff height.

Installation Notes

Circuit board spacers of this type are installed by electronics assembly technicians and PCB service professionals. Always de-energize and discharge the circuit board assembly before installing or replacing spacers to prevent damage to sensitive components. Use calibrated metric hand tools and avoid over-torquing the mating M4 fastener, as brass hardware is susceptible to thread deformation under excessive load. Follow applicable industry guidelines for PCB assembly and rework when replacing standoff hardware in control board applications.