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Bolt 3/4-16 x 2-1/2 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 JG8HTB851 – Frequently Asked Questions
1) What thread size and length is the Metallics JG8HTB851 hex tap bolt?
It's a 3/4-16 x 2-1/2 inch hex tap bolt. The 3/4-16 means a 3/4 inch nominal diameter with 16 threads per inch, which is the UNF (fine) thread pitch rather than the coarse 3/4-10. Fine thread will not start in a coarse-tapped hole or nut, so match the nut or tapped hole before ordering.
2) What does Grade 8 mean on this 3/4 inch bolt, and when do I need it instead of Grade 5?
Grade 8 is an SAE strength class for medium carbon alloy steel, quenched and tempered, and it's the strongest of the common inch grades, well above Grade 5. Use it where the joint is highly loaded or vibrating, equipment mounting, structural brackets, machinery anchoring. It's marked with six radial lines on the head. Grade 8 is also less forgiving of over-torque than Grade 5, so torque to the engineer's spec rather than by feel.
3) Is this the same as a 3/4-10 Grade 8 bolt?
No. The JG8HTB851 is 3/4-16, the fine-thread version. A 3/4-10 is coarse thread and the two are not interchangeable in the same nut or tapped hole. Fine thread gives finer torque control and slightly more tensile area; coarse is the more common general-construction pitch. Check the existing hardware before swapping.
4) Is the JG8HTB851 fully threaded or does it have a shoulder?
Hex tap bolt is the key term: a tap bolt is threaded the full length of the shank rather than having an unthreaded grip length like a standard hex cap screw. That makes the 2-1/2 inch length usable for shallow tapped holes or thin stack-ups where a partially threaded bolt would bottom out on the shoulder.
5) How many bolts come in the Metallics JG8HTB851 package?
Twenty-five bolts, supplied in a jar. The jar pack is the shop-and-truck format for this size, so you're buying a box quantity, not a single fastener. Plan nuts and washers separately since none are included.
6) What nut should I pair with a Grade 8 bolt?
Match the strength: a Grade 8 bolt wants a Grade C or SAE Grade 8 hex nut in 3/4-16 fine thread. Putting a lower-grade nut on a Grade 8 bolt caps the joint at the nut's strength and defeats the reason you specified Grade 8. Nuts and washers are not included with the 25-count jar.
7) Is the Metallics JG8HTB851 bolt suitable for outdoor or wet locations?
Treat it as an indoor or protected-location fastener unless you verify the plating on the part in hand. Grade 8 bolts are alloy steel and the grade designation says nothing about corrosion resistance. For exposed exterior work, a stainless or hot-dip galvanized fastener is the right call instead.
How fast can I get the Metallics JG8HTB851 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 JG8HTB851 come with a warranty?
Absolutely. The Metallics JG8HTB851 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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