You may also like
Nuts 5/16-18 Hvy Hx Nut St-zn (Jar 27)
Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- C
- Buy American Compliant:
- C
- Division:
- Electrical H1
- Grade:
- 2
- Hardness:
- Rockwell B68-C32
- Language Code:
- EN
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- CT
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 2.7 in
- Product Length:
- 3 in
- Product Weight:
- 1.59 lbs
- Product Width:
- 3 in
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 18
- Department:
- Electrical
- Product Subgroup:
- Nuts
- Product Type:
- Heavy Hexagon Nut
- Type2:
- Heavy Hexagon Nut
- Series:
- JHHN
- Product Finish:
- Zinc
- Product Details:
- Heavy Hexagon Nut
- Product Material:
- Steel
Metallics JHHN15 – Frequently Asked Questions
1) What thread size does the Metallics JHHN15 heavy hex nut take?
It's a 5/16-18 nut, so 18 threads per inch on a 5/16 inch diameter bolt or rod. That's the standard UNC coarse pitch for 5/16 fasteners, so it mates with common 5/16 coarse-thread bolts, all-thread rod, and hanger rod. It will not run onto 5/16-24 fine thread.
2) What grade are the Metallics JHHN15 nuts, and is that strong enough for strut and conduit hanging?
Grade 2 steel, with a hardness of Rockwell B68 to C32. That's the common commercial grade for general fastening, conduit support, strut, and hanger rod work. If a drawing calls out Grade 5 or Grade 8 nuts for a structural connection, this is not a substitute.
3) What is the difference between a heavy hex nut and a standard hex nut for 5/16 rod?
A heavy hex nut has a larger across-flats width and more height than a finished hex nut of the same thread, which gives more bearing area under the nut and a bigger wrench footprint. The JHHN15 is the heavy pattern in 5/16-18. If your spec or strut hardware calls for a standard finished hex nut, the heavy nut may not clear tight channel or bracket pockets, so check the space before you swap.
4) Are these 5/16-18 nuts zinc plated for damp or outdoor electrical work?
The nut is steel with a zinc finish, which handles indoor and protected outdoor use. For continuous wet exposure, coastal air, or direct burial, zinc plating is not the right choice; specify hot dip galvanized or stainless hardware for those openings.
5) Is there a minimum order on the JHHN15 nuts?
Yes, the order minimum is 100 count. For larger jobs or a different size of heavy hex nut, other sizes and quantities are available by request.
6) Do these nuts meet Buy American or ARRA requirements on a public project?
The Metallics JHHN15 record carries a C designation for both Buy American and ARRA compliance, and the country of origin is China. On a federally funded job with a domestic-material clause, confirm with your specifying authority how that designation applies before you submit it.
7) Which Metallics part number do I order for 5/16-18 heavy hex nuts?
Order Metallics part JHHN15, from the JHHN heavy hex nut series. One model covers this size, so the only thing to confirm is the thread, 5/16-18.
How fast can I get the Metallics JHHN15 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 JHHN15 come with a warranty?
Absolutely. The Metallics JHHN15 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 JHHN15?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Metallics JHHN15 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.