Electro Hardware MS1049M01F21F Board Spacer M4 Brass 25mm

Product Description

The ELECTRO HARDWARE MS1049M01F21F is a round, female unthreaded circuit board spacer designed to mount and separate printed circuit boards within electronic assemblies. Manufactured from brass and finished with a zinc plating, it provides corrosion resistance and reliable electrical isolation between board layers. Key dimensions are a 25 mm overall length, a 6 mm outside diameter, and an inside diameter ranging from 4.2 to 4.8 mm, sized to accept M4 hardware. Length tolerance is -0.130 to 0.130 mm and inside diameter tolerance is 0.000 to 0.270 mm, making it suitable for assemblies requiring close dimensional control.

This spacer is used in circuit board stacking applications across industrial controls, HVAC control boards, electrical enclosures, and other electronic assemblies where boards must be held at a fixed standoff distance. The female unthreaded design accepts M4 screws passed through from the mounting surface. Technicians and board-level electronics assemblers install these during PCB assembly, panel wiring, or control board replacement work. The metric sizing suits equipment manufactured to metric fastener standards.

Key Features

• Brass body with zinc plating meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• Female unthreaded bore accepts M4 screw hardware
• Overall length of 25 mm provides fixed board-to-board or board-to-panel standoff
• Outside diameter of 6 mm with inside diameter range of 4.2 to 4.8 mm
• Tight length tolerance of -0.130 to 0.130 mm suits precision assemblies
• Round body shape for consistent seating on flat PCB surfaces

Compatibility

Designed as a metric M4 round female unthreaded board spacer for use in any PCB assembly or electronic panel application requiring a 25 mm standoff with a 6 mm OD profile.

Installation Notes

Installation is performed by electronics assemblers or electricians working on control boards and panel assemblies. Power down and de-energize all circuits before servicing any board assembly. Pass an M4 fastener through the bore and torque to the assembly drawing specification for the host equipment. Ensure mounting surfaces are clean and flat to maintain the dimensional tolerances of the spacer stack.