Electro Hardware MS1049M17F16F Round Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1049M17F16F is a round, female unthreaded circuit board spacer designed to maintain precise separation between PCBs and chassis surfaces or stacked boards in electronic assemblies. Molded from Nylon Grade 101 and conforming to MIL-P-17091B, this spacer accepts an M4 screw and provides an overall length of 25 mm (approximately 0.984 inches) with an outside diameter of 6 mm (approximately 0.236 inches). The inside diameter ranges from 4.2 mm to 4.8 mm (0.165 to 0.189 inches), accommodating standard M4 fasteners with controlled clearance. It ships uncoated with a bright finish. Electronics assembly technicians and field service technicians handling control boards in HVAC, electrical, and industrial equipment use this spacer during board mounting and panel builds.

This spacer is suited for metric fastener applications requiring a lightweight, non-conductive standoff. Typical use cases include securing circuit boards inside HVAC control enclosures, electrical panel assemblies, motor control boards, and similar equipment where board-to-surface isolation is required. The nylon construction provides electrical insulation between the board and the mounting surface, making it appropriate for low-voltage control board applications. It is sold in individual units with a minimum order quantity of 10 pieces.

Key Features

• Nylon Grade 101 construction provides electrical insulation and corrosion resistance
• Meets MIL-P-17091B fastener standard for dimensional and material compliance
• Female unthreaded body accepts M4 screw for straightforward installation
• 25 mm overall length with tight length tolerance of -0.130 to 0.130 mm
• 6 mm outside diameter with 4.2 to 4.8 mm inside diameter range
• Uncoated bright finish; no metallic coating to interfere with insulation properties

Compatibility

Designed as an OEM-style replacement or new-installation spacer for circuit board mounting applications using M4 metric screws in round-body standoff configurations.

Installation Notes

Installation is performed by electronics technicians or electricians working on control board assemblies. Power down and de-energize the board or panel completely before handling any circuit board components. Use hand tools only when seating the fastener through the spacer to avoid cracking the nylon body. Follow applicable NEC guidelines and equipment manufacturer torque recommendations when securing board assemblies.