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Nut 1/2-13 Hx Jam Nut 316-SS (Jar 50)
Manufacturer Resources
Product Specs
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Nuts
Metallics JN166JSS – Frequently Asked Questions
1) What thread size does the Metallics JN166JSS jam nut take?
The JN166JSS is a 1/2-13 hex jam nut, so it threads onto 1/2 inch bolts, rods or studs with 13 threads per inch (standard UNC coarse thread for 1/2 inch). It will not run on 1/2-20 fine thread hardware.
2) Is this jam nut OK for outdoor or coastal use?
It's made of 316 stainless, the marine grade, which holds up better than 304 against chlorides, salt spray and de-icing salt. That makes it a reasonable pick for exterior strut, rooftop equipment supports, wastewater and coastal installs.
3) What is the difference between a jam nut and a standard hex nut?
A jam nut is a thinner hex nut, roughly half the height of a standard hex nut of the same thread. It's used as a locking nut tightened against a full nut, or where there isn't room for full nut height, such as against a bracket, strut channel or an exposed threaded rod end. Because it has fewer threads engaged, it isn't the nut to carry the primary load on its own.
4) Can I use a 316 stainless jam nut on a galvanized threaded rod?
It will thread on fine, since 1/2-13 is 1/2-13 regardless of coating. Mixing stainless and zinc or galvanized steel does set up a galvanic couple in wet locations, so for exterior or damp runs it's better practice to keep the rod, nut and washer all 316 stainless. Indoors and dry, the mix is common.
5) Will these jam nuts work with 1/2 inch strut channel hardware and all-thread hangers?
Yes, as long as the threads are 1/2-13, which is the standard coarse pitch used on 1/2 inch all-thread rod and most channel-nut and hanger hardware. The thinner jam nut profile is handy for locking a rod end inside a channel or tightening against a beam clamp where a full nut won't clear.
6) Do I need a separate full nut to use these as lock nuts?
For a jam-nut lock you run a standard full hex nut first, then tighten the thin jam nut against it. The JN166JSS jar contains only the 1/2-13 jam nuts, so order the matching 1/2-13 316 stainless full hex nuts and washers separately if the connection needs them.
7) How many nuts come in the Metallics JN166JSS?
Fifty 1/2-13 316 stainless hex jam nuts, packed in a jar. One order code, JN166JSS, covers the jar.
How fast can I get the Metallics JN166JSS delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Metallics JN166JSS come with a warranty?
Absolutely. The Metallics JN166JSS is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Metallics JN166JSS?
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