Electro Hardware MS1015M01F21F Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1015M01F21F is a round, female unthreaded circuit board spacer designed for M4 screw applications in PCB mounting assemblies. Made from brass with a zinc-plated finish per ASTM B633 and QQ-B-626 Comp 22 Type 1, this spacer provides reliable standoff between a circuit board and a mounting surface. The overall length is 8 mm (approximately 0.315 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). The brass construction and zinc coating offer corrosion resistance in light industrial and electronics environments. This is a metric-system component sold in a minimum order quantity of 10 units.

This spacer is used in residential and commercial electronics assemblies, control board mounting, and panel fabrication where M4 hardware is specified. Typical applications include HVAC control boards, electrical enclosures, and industrial PCB assemblies requiring a precise standoff distance. The female unthreaded design accepts an M4 fastener passed through the board and spacer into a threaded receiver or nut below. Electricians, controls technicians, and panel builders working with metric fastener systems will find this spacer appropriate for standard PCB standoff installations.

Key Features

• Brass body with zinc-plated finish meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• Female unthreaded through-bore accepts M4 screws
• 8 mm overall length (approximately 0.315 inches) provides consistent board standoff
• 6 mm outside diameter (approximately 0.236 inches) with round body shape for stable seating
• Inside diameter tolerance of 0.000 to 0.270 mm ensures compatibility across M4 fastener spec range
• Length tolerance held to -0.130 to 0.130 mm for repeatable stack height

Compatibility

Designed for use with M4 metric fasteners in PCB standoff and circuit board mounting applications. Suitable for control boards and panel assemblies specifying a 6 mm OD, 8 mm OAL round brass spacer with M4 clearance bore.

Installation Notes

Installation is performed by controls technicians or electricians during panel assembly or board replacement. Always de-energize the equipment and follow applicable NEC guidelines before handling circuit boards or internal panel components. Use calibrated metric hand tools and avoid overtightening fasteners through the unthreaded bore, as excess clamping force can crack the board or deform the spacer. Verify standoff height requirements against the board manufacturer's specifications before selecting spacer quantity and stack configuration.