Electro Hardware S513-M07-F16-H Round Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S513-M07-F16-H is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between a printed circuit board and a mounting surface or secondary board. Manufactured from 18-8 and 303 grade stainless steel to the QQ-S-763 fastener standard, this spacer delivers corrosion resistance and dimensional consistency in demanding environments. It measures 0.25 inches overall length with a 0.25-inch outside diameter and a 0.171-inch inside diameter. The uncoated finish keeps tolerances tight. Electricians, electronics technicians, and control board installers use this type of hardware when securing boards in HVAC control panels, electrical enclosures, and similar assemblies.

This spacer fits applications requiring a No. 8 screw size and a compact 0.25-inch standoff. It is suited for use in residential and light commercial control boards, panel enclosures, and any assembly where a low-profile round spacer with a female unthreaded bore is specified. The stainless steel construction makes it appropriate for environments with exposure to moisture or mild chemicals where a zinc or aluminum spacer would degrade prematurely.

Key Features

• 18-8 and 303 grade stainless steel construction meets QQ-S-763 fastener standard
• Female unthreaded bore accepts No. 8 fasteners for secure board mounting
• 0.25-inch overall length with length tolerance of -0.005 to 0.005 inches for consistent standoff height
• 0.171-inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Uncoated finish preserves dimensional accuracy and avoids coating interference in tight assemblies
• Round body shape provides uniform load distribution around the mounting hole

Compatibility

Designed as a standard-dimension round circuit board spacer for assemblies specifying a No. 8 screw size, 0.25-inch OAL, and a 0.25-inch OD female unthreaded standoff in inch-system measurements.

Installation Notes

Installation is performed by electricians or electronics technicians during control board assembly or replacement in panel enclosures. Power down and de-energize the enclosure fully before working on any control board mounting hardware. Use calibrated torque tools appropriate for No. 8 fasteners to avoid over-compression of the spacer or board substrate. Verify standoff height requirements against the board manufacturer's mounting specification before final assembly.