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Nuts 5/16-18 Hx Ny-Ins Locknut SS (Box 2500)
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:
- 0.329 - 0.359 in.
- Fastener Head Width:
- 0.489 - 0.502 in.
- Fastener Height:
- 0.25
- Hardness:
- Rockwell B95-C35
- Language Code:
- EN
- Order Minimum Imperial:
- 2500
- Order Minimum Uom Imperial:
- EA
- Pack Type:
- Box
- Product Group:
- Fasteners
- Remarks:
- The catalog UPC differ from the tarnsaction daat spreadsheet UPC
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 18
- 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:
- NYN
- Product Details:
- Hexagonal Nylon Insert Lock Nut
- Product Material:
- 18-8 Stainless Steel
Metallics NYN164SSB – Frequently Asked Questions
1) Will a Metallics NYN164SSB nylon insert lock nut thread onto 5/16-18 UNC bolts and all-thread?
Yes. The NYN164SSB is a 5/16-18 hex nylon insert locknut, 18 threads per inch, cut to the ANSI/ASME B1.1 thread standard, so it runs on any standard 5/16-18 UNC bolt, screw or all-thread rod. 5/16-18 is the coarse (UNC) pitch for that diameter, so it will not fit 5/16-24 fine-thread fasteners.
2) Are these 5/16-18 locknuts stainless, and can they be used outdoors or in a wet location?
They are 18-8 stainless steel, the standard 300-series austenitic grade used for corrosion resistance in outdoor, damp and washdown environments. That makes them suitable for rooftop equipment, exterior strut and channel work, and coastal or humid installs where plated carbon steel nuts would rust. Pair them with stainless bolts to avoid mixing dissimilar metals.
3) Are Metallics NYN164SSB locknuts Buy American or ARRA compliant for a federal or public job?
No. These are flagged as not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If your project carries Buy American or ARRA domestic-sourcing requirements, this part will not satisfy them and you need a domestically produced stainless locknut instead.
4) What wrench or socket size do I need for the Metallics 5/16-18 nylon insert locknut?
The hex measures 0.489 to 0.502 inch across the flats, which is a 1/2 inch wrench or socket. Because of the nylon collar you are turning the nut against friction for the last few threads, so a socket and ratchet beats an open-end wrench on a long run of them.
5) Should I use a nylon insert locknut or a plain hex nut with a lock washer on vibrating equipment?
A nylon insert locknut is the better choice where vibration is the problem. The nylon collar deforms around the bolt threads and holds friction on the fastener instead of relying on spring tension, so it resists backing off on motor mounts, fan and blower frames, HVAC equipment rails and generator skids. Trade-off: the nylon limits temperature and the insert loses grip with repeated removal, so treat the NYN164SSB as a single-use or few-use nut. For connections you break apart often, a plain hex nut and a separate lock washer is more practical.
6) How many 5/16-18 stainless nylon insert locknuts come in a box from Metallics?
The NYN164SSB ships as a box of 2,500 pieces, and 2,500 each is the order minimum. It's a bulk pack built for shops and MRO cribs doing repeat strut, hanger and equipment-mount work rather than a small count for a single job. Metallics notes other sizes and quantities are available by request.
7) Do these Metallics locknuts meet a dimensional spec I can put on a submittal?
Yes. The NYN164SSB is made to ASME B18.16.6, the dimensional standard for prevailing-torque nylon insert lock nuts, with threads to ANSI/ASME B1.1. Recorded hardness is Rockwell B95 to C35. Those three values are what most mechanical and electrical submittals ask for on a stainless locknut.
How fast can I get the Metallics NYN164SSB 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 NYN164SSB come with a warranty?
Absolutely. The Metallics NYN164SSB 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 NYN164SSB?
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