Electro Hardware S1339-M10-F21-K Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1339-M10-F21-K is a round, female unthreaded circuit board spacer designed to maintain precise standoff distance between a printed circuit board and a mounting surface. Constructed from Grade 2 steel with a zinc-plated finish meeting ASTM B633 and QQ-S-633 Type 1 standards, this spacer delivers reliable corrosion resistance in typical indoor electronics environments. It accepts a 1/4 inch screw, measures 3/16 inch in overall length, and features an inside diameter of 0.257 inches and an outside diameter of 0.5 inches. Electronic assembly technicians, panel builders, and electricians working on control board installations routinely use this type of hardware.

This spacer is suited for residential and commercial control panel assemblies, HVAC circuit board mounting applications, and general electronics fabrication where a low-profile steel standoff is required. Its inch-system dimensions and standard screw sizing make it compatible with common North American board layouts. The zinc-plated steel construction holds up in enclosures subject to minor humidity and temperature cycling, making it a practical choice for mechanical room and utility space panel work.

Key Features

• Female unthreaded design accepts 1/4 inch screws for straightforward board attachment
• Grade 2 steel construction with zinc-plated finish per ASTM B633 and QQ-S-633 Type 1
• Compact 3/16 inch overall length with tight length tolerance of -0.005 to 0.005 inches
• Inside diameter of 0.257 inches with tolerance of 0.000 to 0.010 inches for consistent fit
• Round body shape with 0.5 inch outside diameter for stable board support
• Inch-system dimensioning compatible with standard North American hardware configurations

Compatibility

Designed as a standard-dimension replacement or new-installation spacer for circuit board mounting applications requiring a 1/4 inch screw, 3/16 inch overall length, and 0.5 inch outside diameter in an inch-system round steel standoff.

Installation Notes

Installation is performed by electronics assembly technicians, panel builders, or licensed electricians during control board mounting procedures. Always de-energize the panel or control system and follow lockout/tagout procedures before working near circuit boards or live terminals. Use a screwdriver or nut driver sized for the 1/4 inch fastener and avoid overtightening, which can crack the board or deform the spacer. Refer to the equipment manufacturer's mounting diagram for correct spacer placement and quantity.