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Nuts 5/16-18 Hx Ny-Ins Locknut SS (Jar 100)
Additional Notes
- Other sizes and quantities available by request
Features
- Made to American Standard Dimensions
Manufacturer Resources
Product Specs
- Arra Compliant:
- C
- Buy American Compliant:
- C
- Country Of Origin:
- MUL
- Dimensional Standard:
- ASME B18.16.6
- Division:
- Electrical H1
- Fastener Head Height:
- 0.329 - 0.359 in.
- Fastener Head Width:
- 0.489 - 0.502 in.
- Fastener Height:
- 0.25
- Field Application:
- Width is Wrench Size
- Language Code:
- EN
- Material Standard:
- ASTM F594
- Neurspe:
- https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Hex_Nylon_Insrt_Lck_Nut_18-8_SS_316_SS.pdf
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- CT
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 2.15 in
- Product Length:
- 3 in
- Product Weight:
- 1.18 lbs
- Product Width:
- 3 in
- Sub Division:
- Electrical-E H2
- 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 JNYN164SS316 – Frequently Asked Questions
1) What thread size does the Metallics JNYN164SS316 nylon insert lock nut take?
It's a 5/16-18 nut, so it threads onto standard 5/16 inch coarse (UNC) bolts, studs, and all-thread cut to ANSI/ASME B1.1. Thread form is to that standard, so it mates with any commercially threaded 5/16-18 rod or screw.
2) Will a 316 stainless locknut hold up outdoors or near salt water?
316 stainless is the marine-grade alloy, and that's what these nuts are made from, with mechanical properties to ASTM F594. For coastal rooftop conduit racks, pool rooms, wastewater plants, or any chloride exposure, 316 is the right choice over plain 18-8. The nylon insert does the locking, so pair it with 316 bolts to avoid galvanic mismatch.
3) Do these Metallics locknuts meet Buy American and ARRA requirements for a federal or public project?
Yes. The JNYN164SS316 is flagged both ARRA compliant and Buy American compliant, which is what a government, school, or transit submittal will ask for. Dimensions are to ASME B18.16.6 and material to ASTM F594 if the spec section calls out standards.
4) What wrench or socket size do I need for these 5/16-18 nylon insert locknuts?
Across the flats the nut measures 0.489 to 0.502 inch, which is a 1/2 inch wrench or socket. Metallics notes the width across flats is the wrench size, so no conversion guesswork on the job.
5) Can nylon insert lock nuts be reused, or do I need new ones every time?
The nylon collar in these JNYN series nuts grips the bolt threads by deforming, so holding torque drops each time it's run off. For a vibration-critical connection, install a fresh nut. If you need a fastener you can take apart repeatedly without losing prevailing torque, use an all-metal lock nut or a flat nut with a separate locking washer instead.
6) How tall is the nut, and will it fit in a tight space behind a strut channel or box?
Height runs 0.329 to 0.359 inch, taller than a standard 5/16 hex nut because of the nylon collar at the top. Allow for that extra stack height plus at least a thread or two of bolt projecting into the insert, otherwise the nylon never engages and you get no locking at all.
7) How many nuts come in a jar, and can I buy fewer than 100?
They ship 100 to a jar, and 100 count is the order minimum, so that jar is the smallest buy. Jar weight is 1.18 lbs. Metallics lists other sizes and quantities on request if 5/16-18 isn't the size you need.
8) Is a nylon insert locknut OK where the connection gets hot, like near a ballast or in a boiler room?
The locking element here is nylon, not metal, so sustained heat is the limiting factor rather than the 316 stainless body. For high-temperature locations, specify an all-metal prevailing-torque lock nut instead. For normal indoor and outdoor electrical work (conduit supports, strut, enclosure mounting, grounding hardware), the nylon insert type is standard practice.
How fast can I get the Metallics JNYN164SS316 delivered?
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Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
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Does the Metallics JNYN164SS316 come with a warranty?
Absolutely. The Metallics JNYN164SS316 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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