Electro Hardware MS1033M01F21D Round Circuit Board Spacer

Product Description

The ELECTRO HARDWARE MS1033M01F21D is a round, female unthreaded circuit board spacer designed for M3 screw applications in printed circuit board assemblies. Manufactured from brass to ASTM B633 and QQ-B-626 Comp 22 Type 1 standards and finished with a zinc plating, this spacer provides reliable standoff support and corrosion resistance in electronic enclosures and control board assemblies. It measures 17 mm overall length with an outside diameter of 6 mm and an inside diameter ranging from 3.2 to 3.6 mm. Electronics assembly technicians, control board service professionals, and OEM equipment builders use this spacer to maintain precise board-to-chassis clearance and electrical isolation between PCB layers or mounting surfaces.

This spacer is suited for metric fastener applications requiring an M3 thread size in both commercial and industrial electronic assemblies. Typical installation scenarios include PCB standoff mounting inside HVAC control enclosures, electrical panels, automation equipment, and other systems where brass construction with zinc-plated finish is specified for conductivity and corrosion protection. The female unthreaded body accommodates M3 screws inserted from either end, making it adaptable to a variety of board stacking and mounting configurations.

Key Features

• Brass construction meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards for material consistency
• Zinc-plated finish provides corrosion resistance in enclosed electronic environments
• Female unthreaded body accepts M3 screws for flexible mounting configurations
• 17 mm overall length with a tight length tolerance of -0.130 to 0.130 mm for precise standoff height
• 6 mm outside diameter with 3.2 to 3.6 mm inside diameter and inside diameter tolerance of 0.000 to 0.270 mm
• Round body shape for standard PCB footprint compatibility

Compatibility

Designed for use in metric M3 screw circuit board assemblies requiring a female unthreaded round spacer with a 17 mm standoff height and 6 mm outside diameter.

Installation Notes

Installation is performed by electronics assembly technicians or qualified electricians working on control board and panel assemblies. Always de-energize and discharge the equipment fully before servicing any PCB or control enclosure. Use appropriately sized M3 fasteners and avoid over-torquing, which can deform the unthreaded bore or crack the board mounting hole. Verify standoff height requirements against the PCB layout specification before installation.