Electro Hardware MS1025M01F21F Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1025M01F21F 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 per ASTM B633, QQ-B-626 Comp 22 Type 1, this spacer provides corrosion resistance and consistent electrical standoff performance. It measures 13 mm (approximately 0.512 inches) in overall length, with an outside diameter of 6 mm (approximately 0.236 inches) and an inside diameter ranging from 4.2 to 4.8 mm (approximately 0.165 to 0.189 inches). The metric construction and close-tolerance body suit installations where consistent board-to-board or board-to-chassis clearance is required. Electronics technicians, panel builders, and field service pros use this type of spacer to secure and isolate PCBs in control enclosures.

This spacer is suited for use in residential and commercial HVAC control boards, electrical panels, motor drives, and similar equipment where M4 metric hardware is standard. It is appropriate for any application requiring a round brass standoff to maintain precise separation between a circuit board and a mounting surface or adjacent board. Its female unthreaded bore accepts an M4 fastener passed through from the board side, making it a straightforward drop-in component during board mounting or replacement work.

Key Features

• Brass body with zinc plating per ASTM B633 and QQ-B-626 Comp 22 Type 1 for corrosion resistance
• Female unthreaded design accepts M4 fasteners
• Overall length of 13 mm (approximately 0.512 inches) for consistent PCB standoff height
• Outside diameter of 6 mm (approximately 0.236 inches) fits standard PCB mounting hole patterns
• Inside diameter tolerance of 0.000 to 0.270 mm ensures reliable fastener fit
• Metric system of measurement for compatibility with M4 hardware assemblies

Compatibility

Designed for use in any M4 metric circuit board mounting application requiring a round, female unthreaded brass spacer with a 13 mm standoff length and 6 mm outside diameter.

Installation Notes

Installation is performed by electronics technicians or control board service personnel. Power down and de-energize the equipment fully before handling any circuit board assembly. Use appropriately sized M4 fasteners and avoid over-tightening, which can crack the PCB substrate or deform the spacer body. Follow applicable electrical codes and equipment manufacturer guidelines when servicing control board enclosures.