Electro Hardware MS1035M01F21D Round Circuit Board Spacer M3

Product Description

The ELECTRO HARDWARE MS1035M01F21D is a round, female unthreaded circuit board spacer designed to maintain precise separation between PCBs and mounting surfaces in electronic assemblies. Machined from brass and finished with a zinc plating that meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer delivers reliable corrosion resistance in demanding environments. It accepts an M3 screw, measures 18 mm overall length, carries an inside diameter range of 3.2 to 3.6 mm, and has a 6 mm outside diameter. Electricians, electronics technicians, and automation integrators use this type of hardware when building or servicing control panels, circuit board assemblies, and enclosures where consistent standoff height and secure fastening are critical.

This spacer is suited for metric-standard circuit board mounting applications in both commercial and industrial settings. Typical installations include control panel PCB assemblies, DIN-rail mounted electronics, automation enclosures, and HVAC or electrical equipment control boards requiring precise board-to-board or board-to-chassis standoff distances. The zinc finish makes it appropriate for environments with moderate humidity exposure. Because the unit is sold individually with a minimum order quantity of 10, it is practical for both small repair jobs and higher-volume panel builds.

Key Features

• Female unthreaded round body accepts M3 screws for metric-standard PCB mounting
• Brass construction with zinc plating meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• 18 mm overall length with a tight length tolerance of -0.13 to 0.13 mm for consistent standoff height
• Inside diameter of 3.2 to 3.6 mm with a tolerance range of 0.000 to 0.270 mm
• 6 mm outside diameter round body for stable, compact footprint on the board surface
• Zinc finish provides moderate corrosion resistance suitable for control panel environments

Compatibility

Designed as an OEM-style metric circuit board spacer for use in electronic assemblies requiring M3 screw-size, female unthreaded standoffs with an 18 mm overall length and 6 mm outside diameter.

Installation Notes

Installation is typically performed by electricians or electronics technicians during control panel assembly or PCB service work. Power down and de-energize all circuits before handling circuit board hardware to prevent electrostatic discharge damage or unintended shorts. Use appropriately sized M3 metric fasteners and avoid overtightening, which can crack or deform the spacer body or the PCB mounting hole. Follow applicable NEC guidelines and equipment manufacturer instructions when installing spacers in listed electrical enclosures.