Electro Hardware MMF1829M03F21M4 M4 Hex Standoff

Product Description

The ELECTRO HARDWARE MMF1829M03F21M4 is a male-female hex circuit board standoff designed to create precise spacing and secure mounting between PCB layers, enclosures, and panel surfaces. Machined from brass with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff provides reliable electrical isolation and mechanical support in control board assemblies, industrial electronics, and HVAC equipment panels. The M4 x 0.7 thread on both the male and female ends accommodates standard metric fasteners, and the hex body shape allows wrench engagement for controlled installation torque without slipping.

This standoff is suited for residential and light commercial electronic assemblies where metric hardware is specified. Common install scenarios include control board stacking in HVAC systems, DIN-rail enclosure builds, and panel-mount PCB applications. The 6 mm width across flats fits standard metric hex drivers and nut drivers. Electricians, electronics technicians, and HVAC controls specialists working with metric-threaded board assemblies will find this standoff a direct fit for typical M4 mounting configurations.

Key Features

• Male-female hex configuration allows stacking and through-panel PCB mounting with a single fastener engagement on each end
• Brass construction with zinc-plated finish meets ASTM B633 Type 1 and QQ-B-626 Comp 22 corrosion-resistance standards
• M4 x 0.7 metric thread on both ends accepts standard M4 machine screws
• 6 mm width across flats permits wrench or nut driver installation for secure, consistent seating
• 28.53 mm overall length with 19 mm hex body and 9.53 mm male thread length provides defined board-to-surface standoff distance
• Length tolerance of -0.150 to 0.150 mm supports precision assemblies with tight stacking requirements

Compatibility

Designed as an OEM-style metric standoff for circuit board assemblies requiring M4 x 0.7 threading and a 6 mm hex body profile.

Installation Notes

Installation should be performed by a qualified electronics technician or licensed electrician. Always power down and de-energize the equipment fully before working on any control board or enclosure assembly. Use a calibrated metric nut driver or torque wrench sized for 6 mm hex fasteners to avoid stripping the hex body or over-stressing the brass threads. Do not cross-thread the male end during engagement into a receiving nut or threaded insert.