Electro Hardware S1347-M04-F16-K Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1347-M04-F16-K is a round, female unthreaded circuit board spacer machined from aluminum alloy grade T-3 to QQ-A-225A Comp 2 specifications. It accepts a 1/4 inch screw, measures 5/16 inches (0.3125 inches) in overall length, and features a 1/2 inch outer diameter with a 0.257 inch inner diameter. The uncoated finish leaves the aluminum bare for applications where electrical conductivity or minimal clearance height matters. Electricians, electronics technicians, and control board installers use this type of spacer to create a fixed standoff gap between a PCB and a mounting panel or chassis, preventing shorts and allowing airflow beneath the board.

This spacer is suited for residential and light commercial applications wherever a circuit board requires secure, fixed-height mounting. Typical uses include HVAC control board installations, industrial control panels, electronic enclosures, and any assembly where a 1/4 inch fastener is used to secure PCB-mounted hardware. Its compact 5/16 inch stack height makes it appropriate for tight enclosures with limited vertical clearance.

Key Features

• Female unthreaded bore accepts standard 1/4 inch screws for straightforward PCB mounting
• Overall length of 0.3125 inches with a tight length tolerance of -0.005 to 0.005 inches for consistent standoff height
• 0.257 inch inner diameter with an inside diameter tolerance of 0.000 to 0.010 inches
• 0.5 inch outer diameter provides a stable footprint on the mounting surface
• Aluminum grade T-3 construction per QQ-A-225A Comp 2 for lightweight, corrosion-resistant performance
• Uncoated finish - no additional plating or anodizing that could affect dimensional tolerances

Compatibility

Designed as a standard-geometry round circuit board spacer for use with 1/4 inch fasteners in PCB standoff and panel-mounting applications across HVAC controls, electrical enclosures, and electronic assemblies.

Installation Notes

Installation is typically performed by a licensed electrician or qualified electronics technician. De-energize and lock out the control panel or equipment before handling any circuit board hardware. Ensure the mating screw length accounts for the full 0.3125 inch spacer height plus board thickness to avoid bottoming out or applying uneven clamping force. Do not overtighten fasteners through aluminum spacers, as the unthreaded bore can deform under excessive torque.