Electro Hardware MS1043M17F16F Round Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1043M17F16F is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between PCBs and mounting surfaces in electronic assemblies. Molded from Nylon Grade 101 and meeting the MIL-P-17091B fastener standard, this spacer accepts an M4 screw and provides an overall length of 22 mm with an outside diameter of 6 mm and an inside diameter ranging from 4.2 mm to 4.8 mm. The uncoated finish and nylon construction make it a lightweight, non-conductive solution suited for panel-mount and board-stack configurations found in HVAC control boards, electrical enclosures, and industrial equipment.

This spacer is used in applications where a non-metallic, electrically isolating standoff is required between a circuit board and a chassis, sub-panel, or secondary board. Common install scenarios include HVAC control board assemblies, motor control enclosures, and low-voltage electronic panels where maintaining board clearance prevents shorts and allows airflow. It is sized to metric standards, making it appropriate for equipment manufactured to metric specifications. Installation is typically performed by electronics technicians, electrical contractors, or HVAC service professionals during board replacement or new equipment assembly.

Key Features

• Nylon Grade 101 construction provides electrical isolation and corrosion resistance
• Meets MIL-P-17091B fastener standard for consistent dimensional quality
• 22 mm overall length with tight length tolerance of -0.13 mm to 0.13 mm for precise board spacing
• 6 mm outside diameter with 4.2 mm to 4.8 mm inside diameter accommodates M4 screw pass-through
• Female unthreaded body accepts screw-and-nut fastening in standard board-stack configurations
• Uncoated bright finish; no post-process coating to affect tolerances or conductivity

Compatibility

Designed as an OEM-style replacement or new-assembly spacer for circuit board mounting applications requiring an M4 metric screw, a 6 mm outside diameter, and a 22 mm standoff height in compliance with MIL-P-17091B dimensional standards.

Installation Notes

Power down and de-energize all circuits before servicing any control board or electronic panel where this spacer is used. Verify the M4 screw and mating hardware are appropriate for the board material and enclosure before assembly. Nylon spacers should not be over-torqued, as excessive clamping force can crack or deform the body. Work should be performed in accordance with applicable NEC guidelines and equipment manufacturer instructions.