Metallics JNYN167SS Nuts 5/8-11 Hx Ny-Ins Locknut SS (Jar 50)

The JNYN167SS is a 5/8-11 nylon insert hex locknut, so 11 threads per inch on a 5/8 inch coarse thread, cut to ANSI/ASME B1.1. It threads onto standard 5/8-11 UNC bolts, rod, and all-thread. If your hanger rod or anchor bolt is 5/8-11, this is the matching nut; a fine-thread 5/8-18 fastener will not take it.

Yes, the nut is built to ASME B18.16.6 for prevailing torque nuts, with threads to ANSI/ASME B1.1. Those are the two designations to put on a submittal or spec sheet. Note it is not Buy American compliant and not ARRA compliant, with multiple countries of origin, so on a federally funded job check that against your contract requirements.

The nut is 18-8 stainless steel, so it holds up in damp and exterior conditions and will not rust-bind like a plated carbon nut on a rooftop or mechanical yard. For marine or chloride exposure 316 stainless is the harder-wearing grade; 18-8 is the general-purpose stainless choice. Pair it with stainless rod or bolts to avoid mixing dissimilar metals.

It ships as a jar of 50 nuts, and 50 each is the order minimum, so you buy by the jar rather than the piece. Jar weight is 4.42 lbs. Metallics notes other sizes and quantities can be had by request if 5/8-11 is not the size you need.

The locking element is nylon, not metal, so it is not the fastener for high-heat work such as flue, boiler, or furnace-adjacent connections where the collar can soften and lose its grip. For those spots use an all-metal prevailing torque nut or a jam nut arrangement. For ordinary electrical, plumbing, and HVAC mounting this nut is the stated application.

Reuse is limited. The nylon collar deforms around the bolt threads the first time it is run on, and the prevailing torque drops with each removal, so for anything carrying load or sitting in vibration service the practice is to fit a fresh nut. At 50 to a jar that is easy to do on a service call. The steel body itself is Rockwell B95-C35.