Electro Hardware MMX1535M09-MSC Hex Standoff M3x0.5 20mm

Product Description

The ELECTRO HARDWARE MMX1535M09-MSC is a male-male hex circuit board standoff designed to create fixed spacing between PCBs and mounting surfaces or between stacked boards. The standoff features M3 x 0.5 threads on both ends, a 20 mm overall length, and a 6 mm hex body that accepts a standard wrench for secure installation without marring the fastener. Constructed from Grade 18-8 303 stainless steel with a passivated finish, it resists corrosion in both indoor and light industrial environments. Electronics assemblers, field service technicians, and panel builders use this hardware when building or servicing control boards in HVAC units, electrical enclosures, and similar equipment.

This standoff is suited for metric-threaded circuit board mounting applications in residential and commercial control panels, industrial enclosures, and electronic assemblies. The M3 x 0.5 thread pitch is commonly found on PCBs in HVAC control boards, relay panels, and variable frequency drives. The hex body geometry allows installation with a wrench or hex socket, making it practical in tight enclosures where finger-tightening alone is insufficient. It meets the QQ-S-763 federal specification for stainless steel fasteners.

Key Features

• M3 x 0.5 male threads on both ends for metric board-to-board or board-to-panel mounting
• 20 mm overall body length provides consistent, fixed standoff spacing
• 6 mm hex width across flats for wrench-driven installation and precise torque application
• Grade 18-8 303 stainless steel construction with passivated finish for corrosion resistance
• Meets QQ-S-763 federal fastener specification
• Length tolerance of -0.150 to 0.150 mm for dimensional consistency across assemblies

Compatibility

Designed for use in metric-threaded circuit board and enclosure mounting applications requiring an M3 x 0.5 male-male standoff with a 20 mm overall length.

Installation Notes

Installation is typically performed by electronics technicians or electricians during control panel assembly or PCB service. Power down and de-energize all equipment fully before handling circuit boards or replacing standoffs. Use an appropriately sized wrench or hex socket on the 6 mm flats to seat the standoff without over-stressing the PCB mounting holes. Follow applicable NEC guidelines when installing within electrical enclosures.