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The HOLO-KROME 07040 is an uncoated steel Allen nut designed for threaded fastener applications requiring a hex key drive. With a 1/2-20 thread specification and a 1/2 inch hex key size, this nut is built for secure fastening in mechanical and industrial assemblies. The uncoated steel construction provides solid structural integrity for standard service environments. Installers reach for this style of nut when a flush or recessed drive profile is required and a standard wrench cannot access the fastening point. It is a straightforward, functional fastener suited to professional maintenance, fabrication, and repair work.
The HOLO-KROME 07040 Allen nut is used in a range of mechanical, industrial, and trade service applications where a 1/2-20 unified fine thread is specified. It is well-suited for equipment maintenance, structural assembly, and component fastening tasks across HVAC, plumbing, and general mechanical trades. The hex key drive format makes it practical in tight clearance areas where standard wrench access is limited. Sold individually, it fits into both field repair kits and shop stock for on-demand use.
Designed as a standard replacement or stock fastener for assemblies specifying a 1/2-20 thread Allen nut with a 1/2 inch hex key drive in uncoated steel.
Installation is performed with a 1/2 inch hex key or Allen wrench. Ensure the mating threaded bore is clean and free of debris before threading the nut into place. Verify thread engagement is complete and that the correct torque specification for the assembly is followed per the equipment manufacturer guidelines. Power down or de-energize any equipment before servicing fasteners in live mechanical assemblies.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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