Electro Hardware MMF1817M03F21M4 Hex Standoff M4x0.7

Product Description

The ELECTRO HARDWARE MMF1817M03F21M4 is a male-female hex circuit board standoff designed to create precise spacing between PCBs, panels, and enclosure surfaces. The standoff features an M4 x 0.7 thread on both ends — a male thread on one side and a female threaded bore on the other — allowing stackable, in-line mounting configurations. Constructed from brass with a zinc-plated finish, it meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. The hex body measures 6 mm across flats for easy wrench engagement, and the overall length is 22.53 mm with a body length of 13.00 mm. Electronic assembly technicians and field service pros use this standoff wherever repeatable board-to-board or board-to-chassis spacing is required.

This standoff is suited for use in electronic control assemblies, industrial enclosures, HVAC control boards, and similar applications where secure, non-conductive-gap mounting of PCBs is needed. The metric M4 x 0.7 thread sizing makes it appropriate for metric-threaded mounting holes standard in many commercial and residential control panel assemblies. It is installed individually or in multiples to provide uniform standoff height across a circuit board surface. The minimum order quantity is 10 units, and each package contains 1 piece.

Key Features

• Male-female hex configuration allows stackable PCB mounting and secure panel attachment
• M4 x 0.7 thread size on both ends with a 9.00 mm female thread depth and 9.53 mm male thread length
• Overall length of 22.53 mm with a 13.00 mm hex body for consistent board spacing
• Brass construction with zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22
• 6 mm width across flats for standard wrench or nut-driver installation
• Length tolerance of -0.150 to 0.150 mm for precise fitment in close-tolerance assemblies

Compatibility

Designed for use with M4 x 0.7 threaded mounting holes in metric PCB assemblies, control enclosures, and panel mounting applications. No specific model compatibility data was provided by the manufacturer for this part number.

Installation Notes

Electronic assembly technicians install this standoff using a 6 mm wrench or appropriately sized nut driver. De-energize all equipment completely before servicing any circuit board assembly. Avoid over-torquing the brass threads, as brass is softer than steel fasteners and susceptible to thread damage under excessive force. Follow applicable IPC assembly standards and equipment manufacturer guidelines when installing PCB hardware.