Electro Hardware S537-M01-F21-E Circuit Board Spacer Brass

Product Description

The ELECTRO HARDWARE S537-M01-F21-E is a round, female unthreaded circuit board spacer used to maintain precise standoff distances between a PCB and a mounting surface or between stacked boards. Sized at 0.625 inches overall length with a 0.25 inch outside diameter and a 0.116 inch inside diameter, this spacer accepts a Number 4 screw. The body is solid brass with a zinc-plated finish conforming to ASTM B633, QQ-B-626 Comp 22 Type 1. Electricians, electronics technicians, and control board installers use these spacers during panel assembly, PCB mounting, and control enclosure builds where consistent board elevation and vibration isolation are required.

This spacer is suited for residential and commercial applications wherever Number 4 fasteners are used to mount circuit boards in HVAC control enclosures, electrical panels, and industrial equipment chassis. The female unthreaded body slides over a screw shank and stacks cleanly without thread engagement on the spacer itself, making it practical in high-volume assembly work. The zinc-plated brass construction resists corrosion in indoor enclosure environments. Minimum order quantity is 5 pieces; individual package quantity is 1.

Key Features

• Female unthreaded round body accepts Number 4 screws for consistent PCB standoff mounting
• 0.625 inch overall length with tight length tolerance of -0.005 to 0.005 inches for precise board spacing
• 0.116 inch inside diameter with tolerance of 0.000 to 0.010 inches for controlled screw fit
• Brass construction with zinc-plated finish meets ASTM B633, QQ-B-626 Comp 22 Type 1
• 0.25 inch outside diameter round body for compact, clean installation in tight PCB layouts

Compatibility

Designed as a standard Number 4 screw size round circuit board spacer for use in PCB mounting applications requiring a 0.625 inch standoff height and a female unthreaded brass body.

Installation Notes

Installation is performed by electronics technicians or electricians during control board assembly or panel wiring work. De-energize the board or enclosure completely before handling any PCB or mounting hardware. Slide the spacer over the Number 4 screw shank before seating the board; do not force fit or over-torque fasteners through the unthreaded body. Follow applicable NEC guidelines when mounting control boards inside electrical enclosures.