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Screw 5/16-18 x 7/8 SKT S-Scr Cup St (Jar 100)
Manufacturer Resources
Product Specs
- Division:
- Electrical H1
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Screws
Metallics JSS51678 – Frequently Asked Questions
1) What thread size and length is the Metallics JSS51678 socket set screw?
It's a 5/16-18 x 7/8 inch socket set screw. The 5/16-18 thread is the standard UNC coarse pitch for that diameter, so it threads into any 5/16-18 tapped hole or coupling, and the 7/8 inch length is measured overall on a set screw since it has no head.
2) Is the JSS51678 a cup point or a flat point set screw, and what does that mean for holding?
Cup point. The end is hollowed into a ring-shaped edge that bites into the mating surface, which is why cup point is the usual choice for locking a lug, collar, coupling or busbar connector onto a round conductor or shaft. It does mar the surface it seats against, so if you need to clamp something you plan to reposition without damage, a flat or nylon-tipped point is the better pick.
3) What driver do I need for the Metallics JSS51678 set screw?
A hex key (Allen wrench). It's a socket set screw, so the drive is an internal hex recess in the end of the screw, not an external head. Being fully headless it seats flush or below the surface of the tapped hole, which is what lets it sit inside a lug body or collar without projecting.
4) How is the Metallics JSS51678 packaged, and how many come in a pack?
They ship 100 pieces in a jar. That's the pack format for the part, so an order quantity of one gets you the full jar of 100, not a single screw. Convenient for a van stock or a shop bin where you're pulling set screws one at a time for lug and coupling work.
5) Are these steel set screws suitable for outdoor or wet locations?
The JSS51678 is a plain steel screw, which is intended for dry indoor use. Steel set screws in damp, outdoor or corrosive locations will rust and can seize in the tapped hole, making future removal difficult. For exposed or wet applications, specify a stainless steel set screw in the same 5/16-18 x 7/8 size instead.
6) What part number do I order for the Metallics 5/16-18 x 7/8 cup point socket set screw?
Order Metallics JSS51678. That one number covers the 5/16-18 x 7/8 steel cup point socket set screw in the 100-piece jar, so there are no separate finish or pack options to specify.
How fast can I get the Metallics JSS51678 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 JSS51678 come with a warranty?
Absolutely. The Metallics JSS51678 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 JSS51678?
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