Electro Hardware S357M17F16C Round Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S357M17F16C is a round, female unthreaded circuit board spacer designed to maintain precise clearance between a printed circuit board and a mounting surface or adjacent board. Built from Nylon Grade 101 and supplied uncoated, this spacer meets MIL-P-17091B fastener standards. It measures 1.25 inches overall length (OAL), with a 0.089 inch inside diameter and a 0.1875 inch (3/16 inch) outside diameter, sized for number 2 screw applications. Electronics assemblers, HVAC controls technicians, and electrical panel builders install this type of spacer during board mounting operations where controlled standoff height is required.

This spacer is appropriate for use in control board assemblies found in residential and light commercial HVAC equipment, electrical enclosures, and industrial PCB installations. The round body profile and female unthreaded bore allow a number 2 fastener to pass through cleanly, creating a fixed standoff stack between the board and chassis. Its nylon construction makes it suitable for applications where electrical isolation between the board and mounting hardware is needed. This SKU is sold individually, with a minimum order quantity of 100 units.

Key Features

• Nylon Grade 101 construction provides electrical isolation and corrosion resistance
• Meets MIL-P-17091B fastener standard for consistent dimensional quality
• Female unthreaded bore accepts number 2 screws without thread engagement
• 1.25 inch OAL with tight length tolerance of -0.005 to 0.005 inches for precise standoff height
• Inside diameter tolerance of 0.000 to 0.010 inches over the 0.089 inch nominal ID
• Uncoated bright finish — no plating to crack, chip, or add unintended conductivity

Compatibility

Designed as an OEM-style replacement or new-installation spacer for number 2 screw circuit board mounting applications in control boards, PCB assemblies, and electrical enclosures requiring a 1.25 inch standoff height.

Installation Notes

Circuit board spacers of this type are installed by electronics assemblers or controls technicians during board mounting procedures. Always power down and de-energize the equipment before handling circuit boards or installing spacers. Verify screw size and standoff height requirements against the board drawing before selecting quantity. Nylon spacers should not be overtightened, as the material can crack or deform under excessive clamp load.