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Nuts 3/8-16 Hx Ny-Ins Locknut SS (Jar 100)
Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- N
- Buy American Compliant:
- No
- Dimensional Standard:
- ASME B18.16.6
- Division:
- Electrical H1
- Fastener Head Height:
- 0.438 - 0.468 in.
- Fastener Head Width:
- 0.551 - 0.564 in.
- Fastener Height:
- 0.335
- Language Code:
- EN
- Material Standard:
- ASTM F594
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- CT
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 16
- Thread Standard:
- ANSI/ASME B1.1
- Department:
- Electrical
- Product Subgroup:
- Nuts
- Product Type:
- Hexagonal Nylon Insert Lock Nut
- Type2:
- Hexagonal Nylon Insert Lock Nut
- Series:
- JNYN
- Product Details:
- Hexagonal Nylon Insert Lock Nut
- Product Material:
- 316 Stainless Steel
Metallics JNYN165SS316 – Frequently Asked Questions
1) What thread size is the Metallics JNYN165SS316 nylon insert lock nut?
It's a 3/8-16 nut, 16 threads per inch, cut to ANSI/ASME B1.1. That's the UNC coarse thread for 3/8 inch, so it mates with standard 3/8-16 coarse bolts, all-thread rod and strut hardware. It will not run onto 3/8-24 fine thread.
2) Will a 316 stainless locknut hold up outdoors or in a corrosive area?
The JNYN165SS316 is made from 316 stainless steel, which is the marine grade, so it suits coastal, wash-down, pool chemical and rooftop work where 304 or zinc-plated hardware would rust out. Nut mechanicals conform to ASTM F594, the standard for stainless steel nuts. Pair it with 316 bolts or rod to avoid mixing alloys in the joint.
3) Can I use these stainless locknuts on a federally funded Buy American job?
No. The JNYN165SS316 is listed as not Buy American compliant and not ARRA compliant, with a multiple country of origin. If your contract carries domestic sourcing requirements, specify a domestic-manufacture stainless locknut instead.
4) What wrench or socket size do I need for these 3/8-16 stainless locknuts?
Across the flats the nut measures 0.551 to 0.564 in., so a 9/16 inch wrench or socket fits. Overall head height runs 0.438 to 0.468 in., which is worth knowing if you're working in a tight channel or behind a panel where socket depth is limited.
5) Is this nylon insert locknut dimensionally interchangeable with other brands of 3/8-16 nylon lock nut?
Yes. It's built to ASME B18.16.6, the dimensional standard for prevailing-torque lock nuts, with B1.1 threads. Any 3/8-16 hex nylon insert locknut made to the same standards will share the hex size and thread, so you can mix it into an existing job. The difference to watch is alloy: this one is 316 stainless, not 304 or plated steel.
6) Is there a temperature limit on a nylon insert locknut?
The nylon collar is the limiting element, not the 316 stainless body. Nylon insert nuts are not suited to high-heat service such as flue, boiler or furnace connections, where the insert softens and the locking feature is lost. For those joints use an all-metal prevailing-torque nut or a jam nut. For normal electrical, strut and outdoor mounting temperatures the JNYN165SS316 is fine.
7) How are these sold, and can I get a different size or quantity?
The JNYN165SS316 comes in a jar of 100 pieces, which is also the order minimum (100 count). Other sizes and quantities in the JNYN series are available by request, so if you need 1/4-20 or 1/2-13, or a bulk count rather than a jar, it can be sourced.
8) Can I reuse a nylon insert locknut, or do I need a new one each time?
Nylon insert locknuts lock by the bolt threads cutting into the nylon collar, so the collar deforms on first use and clamping reliability drops each time it's backed off. For vibration-prone or safety-relevant connections, use a fresh nut. The JNYN165SS316 ships 100 to a jar, which covers that.
9) Do I still need a lock washer if I use a nylon insert lock nut?
No. A nylon insert nut is a prevailing-torque fastener, the nylon collar does the anti-vibration work, so a split or tooth lock washer is redundant. A plain flat washer is still worth using on soft material, sheet metal or slotted strut to spread the load and protect the surface.
How fast can I get the Metallics JNYN165SS316 delivered?
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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 JNYN165SS316 come with a warranty?
Absolutely. The Metallics JNYN165SS316 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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