Metallics JBSC51678 5/16-18 x ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.86
Metallics JBSC51678 5/16-18 x 7/8 in. Socket Button Head Hex Cap Screws - Alloy Steel Black - 100qty

Metallics JBSC51678 5/16-18 x 7/8 in. Socket Button Head Hex Cap Screws - Alloy Steel Black - Each

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Model: JBSC51678
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$192.86
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5/16-18 x 7/8 in. Socket Button Head Hex Cap Screws - Alloy Steel Black - 100qty

  • Features

    • Screws are supplied plain.
    • Button Socket head with Hex Drive
    • The are not recommended for critical, high-strength applications.
    • Alloy Steel Black Material
    • 5/16-18 Diameter, 7/8" Length

  • Additional Notes

    • Other sizes and quantities available by request | 8% minimum (applies to machined specimens of lengths at least 4D where D equals the nominal diameler of the screw) | 35% minimum (applies to machined specimens) | Screws must be of a length equal to or greater than 3 diameters to be subject to tensile testing | Class 3A threads over 1" diameter screws are Class 2A threads

Manufacturer Resources

Product Specs

Minimum Purchase:
100 units
Arra Compliant:
N
Buy American Compliant:
No
Dimensional Standard:
ASME B18.3-2012
Division:
Electrical H1
Drive Type:
Hex
Fastener Head Height:
0.152 - 0.166 in.
Fastener Head Type:
Socket
Fastener Head Width:
0.527 - 0.547 in.
Fastener Length:
8-Jul
Field Application:
Electrical, Plumbing, Heating and Air Conditioning Industries
Hardness:
Rockwell C39-44
Hex Size:
16-Mar
Language Code:
EN
Neurspe:
https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Socket_Head_Button_Screw.pdf
Order Minimum Imperial:
100
Order Minimum Uom Imperial:
JR
Pack Type:
Jar
Product Group:
Fasteners
Product Height:
3.6 in
Product Length:
3 in
Product Weight:
1.89 lbs
Product Width:
3 in
Slot Depth:
0.105
Sub Division:
Electrical-E H2
Tensile Strength:
7300 lb minimum
Thread Per Inch:
18
Thread Standard:
ANSI/ASME B1.1
Thread Type:
UN
Department:
Electrical
Product Subgroup:
Screws
Product Type:
Cap Screw
Type2:
Cap Screw
Series:
BSC
Product Finish:
Black
Product Details:
Cap Screw
Product Material:
Alloy Steel Black

Metallics JBSC51678 – Frequently Asked Questions

1) Will a 5/16-18 socket button head cap screw thread into my existing 5/16 tapped hole?
Yes, if that hole is tapped 5/16-18 UNC. The JBSC51678 is 5/16-18, 18 threads per inch, UN thread form to ANSI/ASME B1.1, with overall dimensions to ASME B18.3-2012. It will not run into a 5/16-24 fine-thread hole.
2) Can I use these alloy steel button head screws for a structural or high-strength connection?
No. Metallics states these button head socket screws are not recommended for critical, high-strength applications. They are alloy steel at Rockwell C39-44 with a 7300 lb minimum tensile, which is fine for machine, panel, and equipment fastening, but for a load-path structural bolt use a socket head cap screw or a graded hex bolt rated for the job instead.
3) Do Metallics JBSC51678 cap screws meet Buy American or ARRA requirements for a public project?
No. These screws are not Buy American compliant and are not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic-content clause, source a domestically produced fastener instead.
4) What size hex key does the Metallics JBSC51678 button head cap screw take?
The JBSC51678 uses a hex (Allen) drive, not a slot or Torx. Socket depth is 0.105 in., so a short-reach key or bit seats fully without bottoming out. Head width runs 0.527 to 0.547 in. and head height 0.152 to 0.166 in., which is the low profile a button head gives you when clearance over the surface matters.
5) How many 5/16-18 x 7/8 in. Metallics button head screws come in a jar?
They ship 100 to a jar, and the jar is the minimum order unit. So you are buying in hundreds, not by the piece.
6) Are these screws coated or plated, and will they hold up outdoors?
The JBSC51678 is alloy steel with a black finish and the screws are supplied plain, meaning no corrosion-resistant plating. Treat them as an indoor or protected-location fastener. For wet or exterior work, step to a zinc-plated or stainless fastener in the same 5/16-18 thread.
7) Is a button head socket screw the same as a socket head cap screw?
Not interchangeable. Both take a hex key, but the button head on the JBSC51678 is wider and shallower, 0.527 to 0.547 in. across and only 0.152 to 0.166 in. tall, so it sits nearly flush and spans a slightly oversized hole. A standard socket head cap screw has a smaller-diameter, taller head that drops into a counterbore and carries more load. If your part is counterbored, or the connection is strength critical, use the socket head cap screw.
8) What are 5/16-18 x 7/8 in. socket button head screws typically used for?
Metallics lists these for the electrical, plumbing, heating and air conditioning trades, which is where the low rounded head earns its keep: strut and channel accessories, enclosure and panel assembly, bracket and equipment mounting where a protruding cap screw head would snag or foul a cover. The 7/8 in. length suits thin stacked material with a tapped hole or nut behind it.
9) Can I get this Metallics button head screw in a different length or larger quantity?
Yes. Metallics offers other sizes and quantities of the BSC series button head socket screws by request; the JBSC51678 is specifically the 5/16-18 x 7/8 in. in a 100-count jar.
How fast can I get the Metallics JBSC51678 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 JBSC51678 come with a warranty?
Absolutely. The Metallics JBSC51678 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 JBSC51678?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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