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Nuts 3/4-10 Hx Jam Nut St-zn (Jar 25)
Additional Notes
- Other sizes and quantities available by request
Features
- Jam nuts are tightened against the work surface and a full heavy hex nut is tightened the heavy hex jam nut to keep it from loosening.
- Made to American Standard Dimensions
Manufacturer Resources
Product Specs
- Arra Compliant:
- C
- Buy American Compliant:
- C
- Division:
- Electrical H1
- Fastener Head Height:
- 27/64 in.
- Fastener Head Width:
- 1.088 - 1.125 in.
- Fastener Height:
- 0.617 - 0.665
- Fastener Width:
- 1.240 - 1.299
- Field Application:
- Width is Wrench Size
- Hardness:
- Rockwell B80 - C32
- Language Code:
- EN
- Neurspe:
- https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Hex_Jam_Nut_Steel_Zinc.pdf
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- CT
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 3.6 in
- Product Length:
- 3 in
- Product Weight:
- 7.32 lbs
- Product Width:
- 3 in
- Remarks:
- The catalog UPC differ from the tarnsaction daat spreadsheet UPC
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 10
- Department:
- Electrical
- Product Subgroup:
- Nuts
- Product Type:
- Hexagonal Jam Nut
- Type2:
- Hexagonal Jam Nut
- Series:
- JN
- Product Finish:
- Zinc
- Product Details:
- Hexagonal Jam Nut
- Product Material:
- Steel
Metallics JN168J – Frequently Asked Questions
1) What thread size and pitch is the Metallics JN168J hex jam nut?
It's a 3/4-10 nut: 3/4 inch nominal diameter with 10 threads per inch, which is standard UNC coarse thread for that diameter. So it runs onto 3/4-10 all-thread rod, anchor bolts, or hanger rod without an adapter. If your rod is 3/4-16 fine thread, this is the wrong nut.
2) What is a jam nut actually for, and do I need a second nut with it?
Yes, plan on two nuts. A jam nut is the thin one: it gets tightened down against the work surface first, then a full heavy hex nut is tightened against the jam nut to lock the pair and keep them from backing off under vibration. Ordering jam nuts alone leaves the job half done unless you already have the full nuts on hand.
3) Do these jam nuts qualify for a Buy American or ARRA-funded project?
Metallics lists the JN168J as both Buy American compliant and ARRA compliant, which is what a government, school, or transit procurement file generally needs on fasteners. Country of origin is recorded as multiple.
4) Is this jam nut thinner than a standard 3/4 inch hex nut?
It is. Jam nuts are the reduced-height version, and this one measures 0.617 to 0.665 inch tall against a hex width of 1.240 to 1.299 inches. That low profile is why it works as a locking nut in tight clearances and against a bracket face, but it also means it carries less thread engagement than a full-height nut, so it is not a substitute for the primary nut in a loaded connection.
5) Will zinc-plated steel jam nuts hold up outdoors or in a damp mechanical room?
The JN168J is steel with a zinc finish. Zinc plating handles indoor, dry, and sheltered damp locations well, and it is the usual choice for interior electrical and strut work. For direct weather exposure, wet locations, or corrosive environments, step up to hot-dip galvanized or stainless rather than zinc-plated.
6) How are Metallics JN168J jam nuts packaged and what is the minimum order?
They ship in a jar of 25. Minimum order is 100 count, so the smallest buy is four jars.
7) Will a 3/4-10 Metallics jam nut thread onto any 3/4 inch coarse rod, or do I need to check the dimensions?
It is built to American Standard dimensions, so it mates with any standard 3/4-10 UNC threaded rod, bolt, or anchor regardless of who made it. No brand matching needed on the rod side.
8) How hard are these nuts, and will they strip on a graded bolt?
Hardness is Rockwell B80 to C32 on the JN168J. That is the normal range for a zinc-plated carbon steel nut and it will seat on common threaded rod and standard bolts without galling. Pair a high-strength graded bolt with a correspondingly graded nut rather than this one if the connection is engineered for a specific proof load.
9) Can I get the Metallics JN hex jam nut in sizes other than 3/4-10?
The JN series runs beyond this size, and Metallics notes other sizes and quantities are available by request. The JN168J specifically is the 3/4-10 zinc-plated steel version in a 25-count jar.
How fast can I get the Metallics JN168J 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 JN168J come with a warranty?
Absolutely. The Metallics JN168J 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 JN168J?
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