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Nuts 1/2-13 Hx Jam Nut St-zn (Jar 50)
Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- C
- Buy American Compliant:
- C
- Division:
- Electrical H1
- Fastener Head Height:
- 16-May in.
- Fastener Head Width:
- 0.736 - 0.750 in.
- Fastener Height:
- 0.427 - 0.448
- Fastener Width:
- 0.840 - 0.866
- Hardness:
- Rockwell B95-C32
- Language Code:
- EN
- Order Minimum Imperial:
- 50
- Order Minimum Uom Imperial:
- CT
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 3.6 in
- Product Length:
- 3 in
- Product Weight:
- 1.7 lbs
- Product Width:
- 3 in
- Remarks:
- The catalog UPC differ from the tarnsaction daat spreadsheet UPC
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 13
- Department:
- Electrical
- Product Subgroup:
- Nuts
- Product Type:
- Hexagonal Jam Nut
- Type2:
- Hexagonal Jam Nut
- Series:
- JN
- Product Finish:
- Zinc
- Product Details:
- Hexagonal Jam Nut
- Product Material:
- Steel
Metallics JN166J – Frequently Asked Questions
1) Will a Metallics JN166J jam nut thread onto 1/2 inch all-thread rod?
Yes. The JN166J is a 1/2-13 hex jam nut, so 13 threads per inch, which is the standard UNC coarse pitch for 1/2 inch rod and bolts. It threads onto 1/2 inch all-thread rod, hanger rod, and 1/2-13 bolts. If your rod is fine thread (1/2-20), this is not the nut.
2) Do these jam nuts meet Buy American or ARRA requirements on a federal project?
Metallics lists the JN166J as both Buy American compliant and ARRA compliant. Country of origin is China. On a federally funded job where the specification reads domestic-origin only rather than compliant-status, have your specifier confirm which standard the drawing is calling for.
3) What wrench size fits the JN166J hex jam nut?
Across the flats it measures 0.736 to 0.750 inch, so a 3/4 inch wrench or socket is the fit. Corner to corner it runs 0.840 to 0.866 inch, which is what matters if you are working in a tight channel or strut.
4) Are these zinc plated steel nuts okay for outdoor or damp locations?
The JN166J is steel with a zinc finish. Zinc plating handles indoor and protected work well, but it is a sacrificial coating, not stainless. For wet exterior runs, pool rooms, coastal sites, or anywhere washdown is routine, specify stainless or hot dip galvanized hardware instead.
5) How many nuts come in a jar and can I buy fewer than 50?
They ship as a jar of 50, and 50 count is the order minimum, so that jar is the smallest buy. The jar runs about 1.7 lbs. Other sizes and quantities are available by request.
6) What is a jam nut actually used for on an electrical install?
A jam nut is the thin hex nut you run on behind a standard nut to lock the assembly so vibration does not back it off, and it is also what you reach for when the rod or stud does not project far enough for a full-height nut. The JN166J covers that job in 1/2-13 on rod-hung conduit, strut, trapeze supports, and fixture hangers.
How fast can I get the Metallics JN166J delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
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 JN166J come with a warranty?
Absolutely. The Metallics JN166J 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 JN166J?
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selection,
installation tips, and troubleshooting. Contact Us
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