Electro Hardware S309M01F21C Circuit Board Spacer Brass

Product Description

The ELECTRO HARDWARE S309M01F21C is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between printed circuit boards and mounting surfaces. Machined from brass and finished with zinc plating per ASTM B633, QQ-B-626 Comp 22 Type 1, this spacer measures 0.5 inches overall length with a 0.1875-inch outside diameter and a 0.089-inch inside diameter. It accepts a number 2 screw size and provides consistent, corrosion-resistant separation in electronics assemblies. Licensed electricians, electronics technicians, and panel builders use these spacers during board mounting and chassis assembly work.

This spacer is suited for residential and light commercial circuit board installations where a compact, round standoff is required. Typical applications include control board mounting in HVAC equipment, electrical panel assemblies, and industrial enclosures where a number 2 fastener and a 0.5-inch standoff height are specified. The zinc finish provides added corrosion resistance in environments where moisture exposure is a concern. Sold individually with a minimum order quantity of one.

Key Features

• Female unthreaded body accepts number 2 screw size for straightforward board mounting
• Brass construction with zinc plating meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• 0.5-inch overall length with tight length tolerance of -0.005 to 0.005 inches for consistent standoff height
• Inside diameter tolerance of 0.000 to 0.010 inches ensures reliable screw fit
• Round body shape compatible with standard PCB mounting hole layouts
• Compact 0.1875-inch outside diameter suits dense board layouts with limited clearance

Compatibility

Designed as an OEM-style replacement or direct-fit spacer for circuit board assemblies requiring a number 2 screw, female unthreaded round standoff with a 0.5-inch overall length.

Installation Notes

Installation is performed by licensed electricians or qualified electronics technicians. De-energize all circuits and discharge any capacitors before handling circuit boards or installing standoffs. Use a number 2 fastener matched to the board specification and do not overtighten, as brass spacers can deform under excessive torque. Follow all applicable NEC guidelines when installing control boards within electrical enclosures.