Electro Hardware MS1001M01F21D Circuit Board Spacer M3

Product Description

The ELECTRO HARDWARE MS1001M01F21D is a round, female unthreaded circuit board spacer designed for M3 screw applications in PCB assembly and electronics mounting. The spacer measures 1.00 mm overall length with a 6.00 mm outside diameter and an inside diameter ranging from 3.20 to 3.60 mm. Constructed from brass and finished with zinc plating per ASTM B633 and QQ-B-626 Comp 22 Type 1, it delivers corrosion resistance and dimensional stability in precision circuit board stacking applications. Electronics assembly technicians and PCB fabricators use this spacer to maintain consistent board-to-board or board-to-chassis standoff clearance in tight metric installations.

This spacer is suited for use in residential and commercial electronics assemblies, control boards, and instrumentation panels where M3 metric hardware is specified. Its compact 1.00 mm length makes it appropriate for low-profile PCB mounting scenarios where minimal standoff is required. The metric dimensioning and brass construction make it a common choice in both OEM manufacturing and field-service repair of control electronics found in HVAC, industrial, and electrical enclosure applications.

Key Features

• Female unthreaded design accepts M3 screws for straightforward PCB mounting
• 1.00 mm overall length with a length tolerance of -0.130 to 0.130 mm for precise stacking
• Inside diameter range of 3.20 to 3.60 mm with a tolerance of 0.000 to 0.270 mm
• 6.00 mm outside diameter provides stable seating on circuit board surfaces
• Brass body with zinc-plated finish meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• Round body shape and metric dimensioning suit compact, high-density PCB layouts

Compatibility

Designed as an OEM-style replacement or new-installation spacer for circuit board assemblies requiring M3 metric screw hardware and a female unthreaded standoff with a 6.00 mm outside diameter.

Installation Notes

Installation is typically performed by electronics assembly technicians or electricians working on control board assemblies. Power down and de-energize all circuits before servicing any PCB or control enclosure. Use appropriate M3 metric screwdrivers or nut drivers and avoid over-torquing, as brass spacers can deform under excessive clamping force. Follow applicable NEC guidelines when working within electrical enclosures.