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Bolts 3/8-16 X 3 Carriage Blt St-zn (Jar 50)
Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- N
- Buy American Compliant:
- No
- Dimensional Standard:
- ASME B18.5-1990
- Division:
- Electrical H1
- Fastener Head Type:
- Mushroom
- Fastener Head Width:
- 0.782 - 0.844 in.
- Fastener Height:
- 0.188 - 0.208
- Fastener Length:
- 3
- Fastener Width:
- 0.368 - 0.388
- Field Application:
- Electrical, Plumbing, Heating, Air Conditioning Industries
- Hardness:
- Rockwell B70-B100
- Language Code:
- EN
- Neurspe:
- https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Carriage_Bolt_18-8_SS_and_316_SS.pdf
- Order Minimum Imperial:
- 50
- Order Minimum Uom Imperial:
- EA
- Outside Diameter:
- 0.360 - 0.388 IN
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 7.25 in
- Product Length:
- 4.5 in
- Product Weight:
- 2259 g
- Product Width:
- 114.3 MM
- Sub Division:
- Electrical-E H2
- Tensile Strength:
- 60000 psi minimum
- Thread Direction:
- Right Hand
- Thread Per Inch:
- 16
- Yield Strength:
- 36000 psi minimum
- Department:
- Electrical
- Product Subgroup:
- Bolts
- Product Type:
- Hexagonal Bolt
- Type2:
- Hexagonal Bolt
- Series:
- CB and JCB
- Product Finish:
- Zinc
- Product Details:
- Hexagonal Bolt
- Product Material:
- Steel
Metallics JCB26 – Frequently Asked Questions
1) What size is the Metallics JCB26 carriage bolt, and how many come in a jar?
The JCB26 is a 3/8-16 carriage bolt, 3 inches long, in zinc-plated steel, sold 50 pieces to a jar. Threads are right hand at 16 threads per inch, and the shank measures 0.368 to 0.388 inch across. Order minimum is 50 each, which is one jar.
2) What grade and strength is this zinc carriage bolt rated to?
Tensile strength is 60,000 psi minimum with 36,000 psi minimum yield, and hardness is Rockwell B70 to B100. That is low-carbon steel strength, suitable for general anchoring of conduit racks, strut, hangers and equipment bases. It is not a high-strength structural bolt, so if a drawing calls out a higher grade for a load-bearing connection, this is not the fastener for that line item.
3) Can I use these on a federally funded job with Buy American requirements?
No. The JCB26 carriage bolt is listed as not Buy American compliant and not ARRA compliant, with country of origin shown as multiple. For a project with domestic sourcing language in the spec, you need a documented domestic fastener instead.
4) Is the JCB26 carriage bolt made to a dimensional standard so it interchanges with other brands?
It is built to ASME B18.5-1990, the round head bolt standard, so head diameter, head height and the square neck match any other B18.5 carriage bolt of the same 3/8-16 size. Nuts and washers in 3/8-16 from any supplier thread on without issue.
5) Do carriage bolts come with nuts and washers, or do I order those separately?
Bolts only. The jar of 50 JCB26 carriage bolts does not include nuts or washers, so add 3/8-16 hex nuts and 3/8 flat washers to the order. A flat washer under the nut matters on wood, since the mushroom head is designed to bear directly on the face without one.
6) Will zinc-plated carriage bolts hold up outdoors or in a wet mechanical room?
Zinc plating over steel handles damp indoor and sheltered exterior use, but it is a sacrificial coating. In standing water, coastal air, or a pool or wastewater room, it will eventually rust and you want stainless instead. Metallics lists stainless carriage bolts in 18-8 and 316 in the same CB and JCB program, and other sizes and quantities are available by request.
7) What is a carriage bolt used for on electrical and mechanical work, and when should I use a hex bolt instead?
A carriage bolt's mushroom head and square neck bed into wood so the bolt cannot spin, which lets one person tighten from the nut side alone. That makes it the choice for strut and conduit rack mounting to wood blocking, equipment bases, and panel backboards. The smooth domed head also leaves nothing to snag in a walkway. If you are bolting steel to steel, or need a wrench on both ends, go to a hex head bolt; the square neck has nothing to grip in a round hole through steel. Metallics lists this bolt for electrical, plumbing, heating and air conditioning work.
How fast can I get the Metallics JCB26 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 JCB26 come with a warranty?
Absolutely. The Metallics JCB26 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 JCB26?
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