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Bolt 3/8-16 x 3 Grade 9 Hx Cap Scre (Jar 25)
Manufacturer Resources
Product Specs
- Division:
- Electrical H1
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Bolts
Metallics JG9HC18 – Frequently Asked Questions
1) What size and thread is the Metallics JG9HC18 hex cap screw?
It's a 3/8-16 x 3 inch hex cap screw. The 3/8-16 call-out is the coarse (UNC) thread for 3/8 inch diameter, so it mates with standard 3/8-16 nuts and tapped holes, and the 3 inch length is measured under the head. Order it by part number JG9HC18.
2) How many bolts come in a jar of Metallics JG9HC18?
Twenty-five pieces per jar. Metallics packages this 3/8-16 x 3 grade 9 hex cap screw in jar pack, which is the handy pack a service van or shop bin gets stocked from rather than a bulk box.
3) What does grade 9 mean on a hex cap screw, and is it stronger than grade 8?
Grade 9 is a higher strength class than grade 8 in the inch fastener lineup, so the JG9HC18 is specified where a grade 5 or grade 8 bolt is not holding up, typically high-load structural or equipment mounting. Because the strength comes from heat treatment, don't weld on it or re-form it, and torque it to the grade 9 value for 3/8-16 rather than a generic grade 5 chart figure.
4) Can I use a 3/8-16 x 3 inch grade 9 hex cap screw with a standard 3/8 inch nut and washer?
Yes on the thread, with one caution. The 3/8-16 thread takes any standard 3/8-16 coarse nut, but on a grade 9 bolt you should pair it with a matching high strength nut and hardened washers. A low grade nut will strip before the bolt reaches its clamp load, which defeats the reason you chose grade 9.
5) Are Metallics grade 9 hex cap screws suitable for electrical equipment and strut mounting?
That's exactly where they're stocked. Metallics lists this bolt in its electrical fastener line, and a 3/8-16 x 3 inch bolt is the common size for hanging strut, trapeze supports, panel and transformer mounting, and gear anchoring where a 3/8 inch hole is drilled or punched.
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Does the Metallics JG9HC18 come with a warranty?
Absolutely. The Metallics JG9HC18 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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