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Nuts 4-40 Hx Nut St-zn (Jar 100)
Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- N
- Buy American Compliant:
- No
- Division:
- Electrical H1
- Fastener Head Width:
- 0.241 - 0.250 in.
- Fastener Height:
- 0.087 - 0.098
- Fastener Width:
- 0.087 - 0.098
- Field Application:
- Electrical, Plumbing, Heating and Air Conditioning Industries
- Grade:
- 2
- Hardness:
- Rockwell B68-C32
- Language Code:
- EN
- Neurspe:
- https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Hex_Nut_Domestic_Gr_2_Gr_5_Gr_8_Gal_18-8_SS_316_SS.pdf
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- JR
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 2.15 in
- Product Length:
- 3 in
- Product Weight:
- 0.16 lbs
- Product Width:
- 3 in
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 40
- Thread Standard:
- ASME B18.2.2
- Department:
- Electrical
- Product Subgroup:
- Nuts
- Product Type:
- Hexagonal Nut
- Type2:
- Hexagonal Nut
- Series:
- JN
- Product Finish:
- Zinc
- Product Details:
- Hexagonal Nut
- Product Material:
- Steel
Metallics JN157 – Frequently Asked Questions
1) What thread size are the Metallics JN157 hex nuts?
The JN157 is a 4-40 hex nut, meaning a #4 machine screw diameter with 40 threads per inch. It mates with any #4-40 machine screw or threaded rod cut to that thread. The thread conforms to ASME B18.2.2, the standard dimensional spec for hex nuts, so it will seat correctly on standard #4-40 fasteners from any maker.
2) Are Metallics JN157 nuts strong enough for structural or high-torque use?
No. The JN157 is a Grade 2 steel nut with a hardness of Rockwell B68 to C32, which is general-purpose low-carbon strength. It is meant for light mechanical assembly, not structural or high-tensile joints. If the drawing calls for Grade 5 or Grade 8, a Grade 2 nut does not satisfy it.
3) Do Metallics JN157 nuts meet Buy American or ARRA requirements on a federal job?
No. The JN157 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing requirements, you need a domestically produced Grade 2 hex nut instead.
4) What wrench or socket size fits a 4-40 Metallics JN157 nut?
Across the flats the JN157 measures 0.241 to 0.250 inches, so a 1/4 inch wrench, socket, or nut driver is the right tool. The nut stands 0.087 to 0.098 inches thick, which is a thin profile, so a deep socket is not needed.
5) Will zinc-plated 4-40 hex nuts hold up outdoors or in a damp location?
Zinc plating over steel gives corrosion resistance for indoor and protected applications, which is what the JN157 is built for. For wet, coastal, or wash-down environments, a stainless nut is the better call. Zinc-plated steel will eventually rust where the plating is scratched or constantly wet.
6) What trades actually use a #4-40 zinc hex nut like this?
Metallics lists the JN157 for the electrical, plumbing, heating, and air conditioning trades. In practice it is the small nut for device and plate hardware, control and low-voltage panel assembly, mounting small brackets and terminal blocks, and anywhere a #4 machine screw needs to be captured.
7) Can I get the JN series hex nuts in a different size or a larger quantity?
Yes. The JN157 covers 4-40 in a 100-count jar, and Metallics offers other sizes and quantities in the JN series by request. If you are standardizing a shop on one thread size or need bulk counts rather than jars, ask for the size and pack you need.
How fast can I get the Metallics JN157 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 JN157 come with a warranty?
Absolutely. The Metallics JN157 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 JN157?
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 JN157 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.