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Bolt 3/4-16 x 1-1/2 Grade 8 Hex Tap (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 JG8HTB841 – Frequently Asked Questions
1) What thread does the Metallics JG8HTB841 hex tap bolt use, and is it fine or coarse?
It's a 3/4-16 thread, which is the fine (UNF) pitch for 3/4 inch diameter. Coarse 3/4 inch hardware is 3/4-10, so a 3/4-16 bolt will not thread into a coarse nut or a coarse tapped hole. Match it to 3/4-16 nuts or a 3/4-16 tapped hole only. Length is 1-1/2 inches.
2) Is this bolt threaded all the way to the head?
Yes. A hex tap bolt is fully threaded from the head to the tip, unlike a standard hex cap screw that has a plain shoulder under the head. The JG8HTB841 is a 3/4-16 x 1-1/2 hex tap bolt, so the full 1-1/2 inches of shank carries thread, which is what you want when you're threading into a tapped hole rather than clamping through a stack with a nut.
3) What does Grade 8 mean on a 3/4 inch hex bolt, and when do I need it instead of Grade 5?
Grade 8 is the higher-strength alloy steel class in the SAE inch system, rated to 150,000 psi tensile against 120,000 psi for Grade 5, and it's marked with six radial lines on the head. Use it where the joint is highly loaded or vibration-prone: equipment frames, motor and generator mounts, structural steel connections, heavy bracketry. For general electrical strut and enclosure mounting, Grade 5 is usually enough. Grade 8 is also less forgiving of bending and shouldn't be substituted into applications calling for a ductile fastener.
4) How many bolts come in a jar of Metallics JG8HTB841?
25 pieces per jar. The 3/4-16 x 1-1/2 Grade 8 hex tap bolts ship in Metallics' jar pack, which is the shop-bin format, so plan quantities in multiples of 25 rather than by the single bolt.
5) Do I need Grade 8 nuts and washers with these bolts?
Yes, pair them up. A Grade 8 bolt should run against a Grade 8 (or ASTM A563 Grade DH) nut and hardened washers, otherwise the nut strips before the bolt reaches its rated load and you've paid for strength you can't use. Nuts and washers aren't included with the JG8HTB841 jar, so order them separately in 3/4-16 to match the fine thread.
6) Can I use these Grade 8 bolts outdoors or in a wet location?
Think twice. Grade 8 hex tap bolts like the JG8HTB841 are alloy steel with a plain or zinc-type finish, not stainless, so they are not a corrosion-resistant fastener for exposed outdoor, rooftop, or washdown service. For wet or corrosive locations use a stainless or hot-dip galvanized fastener instead and accept the lower strength grade. Indoors, in dry mechanical and electrical rooms, these are in their element.
How fast can I get the Metallics JG8HTB841 delivered?
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Does the Metallics JG8HTB841 come with a warranty?
Absolutely. The Metallics JG8HTB841 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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