Electro Hardware MS1039M17F16D Round Circuit Board Spacer

Product Description

The ELECTRO HARDWARE MS1039M17F16D is a round, female unthreaded circuit board spacer designed to maintain precise separation between a PCB and a mounting surface or secondary board. Machined from Nylon Grade 101 and left uncoated, this spacer meets MIL-P-17091B fastener standards. It accepts an M3 screw, measures 20 mm (0.787 inches) overall length, and carries an outside diameter of 6 mm (0.236 inches). The inside diameter ranges from 3.2 mm to 3.6 mm (0.126 to 0.142 inches), providing the clearance needed for M3 fastener pass-through. Electronics assembly technicians and field service electricians use this spacer during board mounting and panel assembly work.

This spacer is suited for use in electronics assemblies where non-conductive standoff material is required between circuit boards and chassis surfaces. The nylon construction makes it appropriate for low-voltage PCB mounting in control panels, HVAC control boards, electrical enclosures, and similar light-duty electronics assembly applications. Its metric dimensioning fits standard M3 fastener layouts commonly found in OEM equipment and aftermarket panel builds alike.

Key Features

• Nylon Grade 101 construction provides electrical insulation and corrosion resistance
• Meets MIL-P-17091B fastener standard for dimensional consistency
• Female unthreaded body accepts M3 screws with 3.2 to 3.6 mm inside diameter clearance
• 20 mm overall length with a length tolerance of -0.13 mm to 0.13 mm
• Uncoated bright finish — no added coating to affect fitment or clearance
• Round body shape for consistent seating in standard PCB mounting holes

Compatibility

Designed for use with M3 screw fastener systems in metric PCB and electronics panel assemblies requiring a non-conductive round standoff spacer.

Installation Notes

Installation is performed by electronics assembly technicians or electricians working on control panel builds. Always de-energize and lock out the circuit or panel before servicing any board assembly. Insert the spacer into the mounting hole before threading the M3 fastener through to avoid misalignment. Do not overtighten M3 fasteners against nylon spacers, as the material can crack or deform under excessive clamping force.