Electro Hardware MS1039M01F21F Circuit Board Spacer M4

Product Description

The ELECTRO HARDWARE MS1039M01F21F is a round, female unthreaded circuit board spacer designed to create precise standoff gaps between PCBs and mounting surfaces. Manufactured from brass with a zinc-plated finish meeting ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer measures 20 mm overall length with an outside diameter of 6 mm and an inside diameter ranging from 4.2 to 4.8 mm. It is sized for M4 screw hardware. The zinc plating provides corrosion resistance in light-duty electronic assembly environments. Electronics assembly technicians and field service engineers use this spacer in PCB mounting applications across industrial control panels, HVAC control boards, and similar electrical enclosures.

This spacer is suited for metric-standard PCB assemblies requiring an M4 fastener and a 6 mm OD standoff. Typical applications include mounting control boards inside residential and light commercial HVAC equipment, electrical enclosures, and industrial automation panels where consistent board-to-chassis clearance is required. The female unthreaded design accepts an M4 screw passed through from the mounting surface side. Minimum order quantity is 10 units.

Key Features

• Female unthreaded round spacer accepts M4 screw hardware
• Brass body with zinc-plated finish meeting ASTM B633 and QQ-B-626 Comp 22 Type 1
• 20 mm overall length with a length tolerance of -0.13 to 0.13 mm for precision stacking
• 6 mm outside diameter with 4.2 to 4.8 mm inside diameter range
• Metric measurement system for compatibility with M4 fastener assemblies
• Lightweight at approximately 0.01 pounds per unit

Compatibility

Designed as a metric-standard M4 circuit board spacer for use in PCB mounting assemblies requiring a 6 mm OD, 20 mm standoff height.

Installation Notes

Installation is performed by electronics technicians or field service personnel during control board assembly or replacement. Always de-energize and lock out the equipment before working inside any electrical enclosure. Use the correct M4 driver or hex tool to avoid stripping the mating fastener. Follow applicable NEC guidelines when mounting control boards inside energized enclosures.