Electro Hardware MS1005M01F21F Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1005M01F21F is a round, female unthreaded circuit board spacer designed for M4 screw applications in PCB assembly and electronic enclosure work. Manufactured from brass with a zinc-plated finish meeting ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer provides reliable standoff support between a circuit board and a mounting surface. The overall length is 3 mm (approximately 0.118 inches), the outside diameter is 6 mm (approximately 0.236 inches), and the inside diameter ranges from 4.2 mm to 4.8 mm (approximately 0.165 to 0.189 inches). It is suited for electronics technicians, field service engineers, and assembly professionals working on control boards and panel-mount electronics in HVAC, electrical, and industrial equipment.

This spacer is used wherever an M4 fastener is required to create a fixed standoff distance between a PCB and a chassis, DIN rail enclosure, or equipment panel. The brass construction offers good conductivity and corrosion resistance, while the zinc plating adds additional surface protection in light-duty environments. Typical applications include control board mounting in residential and light commercial HVAC equipment, electrical panels, and industrial enclosures where metric hardware is specified.

Key Features

• Female unthreaded design accepts M4 screws for straightforward through-mount installation
• Brass base material with zinc-plated finish per ASTM B633 and QQ-B-626 Comp 22 Type 1
• 3 mm overall length provides a precise, low-profile standoff between board and mounting surface
• 6 mm outside diameter with 4.2 to 4.8 mm inside diameter for consistent M4 fitment
• Round body shape for uniform load distribution on PCB mounting holes
• Metric system dimensioning for compatibility with metric fastener specifications

Compatibility

Designed for use with M4 metric screws in PCB standoff and circuit board mounting applications across HVAC controls, electrical enclosures, and industrial panel assemblies where a female unthreaded brass spacer is required.

Installation Notes

Installation is performed by electronics technicians or qualified service professionals. De-energize all equipment fully before handling or replacing control board hardware. Use calibrated metric hand tools to avoid over-torquing M4 fasteners through the unthreaded bore. Follow applicable NEC or equipment manufacturer guidelines for control board mounting and hardware specifications.