Metallics JSHC3878 3/8-16 x 7/...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.86
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Metallics JSHC3878 3/8-16 x 7/8 in. Socket Head Hex Cap Screws - Alloy Steel Black - Each

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Model: JSHC3878

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

$192.86
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3/8-16 x 7/8 in. Socket Head Hex Cap Screws - Alloy Steel Black - 100qty

  • Features

    • Elongation is 10% minimum (applies to machined specimens of lenglh at least 4D where D equals the nominal diameter of the screw) and Reduction of Area is 33% minimum (applies to machined specimens)
    • 3/8-16 Diameter, 7/8" Length
    • Socket head with Hex Drive
    • Supplies greater tensile strength than equivalent sizes of Grade-5 or Grade-8 hex head cap screws while requiring less surface area or counterbore since the fastener is intenally wrenched.
    • Alloy Steel Black Material

  • Additional Notes

    • Other sizes and quantities available by request | Cap screws of a length 3D or greater, where D equals the nominal diameter of the screw, are subject to tensile strength, yield strength, elongation and reduction of area testing.

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:
0.368 - 0.375 in.
Fastener Head Type:
Socket
Fastener Head Width:
0.55 - 0.562 in.
Fastener Length:
8-Jul
Field Application:
Electrical, Plumbing, Heating and Air Conditioning Industries
Hardness:
Rockwell C39
Hex Size:
16-May
Language Code:
EN
Neurspe:
https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Socket_Head_Cap_Screw_Alloy_Zinc.pdf
Order Minimum Imperial:
100
Order Minimum Uom Imperial:
JR
Pack Type:
Jar
Product Group:
Fasteners
Product Height:
5.75 in
Product Length:
3.5 in
Product Weight:
4.02 lbs
Product Width:
3.5 in
Slot Depth:
0.182
Sub Division:
Electrical-E H2
Tensile Strength:
180000 psi minimum
Thread Per Inch:
16
Thread Type:
UN
Wall Thickness:
0.143
Yield Strength:
162000 psi minimum
Department:
Electrical
Product Subgroup:
Screws
Product Type:
Cap Screw
Type2:
Cap Screw
Series:
SHC
Product Finish:
Black
Product Details:
Cap Screw
Product Material:
Alloy Steel Black

Metallics JSHC3878 – Frequently Asked Questions

1) Will a Metallics JSHC3878 socket head cap screw thread into a 3/8-16 tapped hole?
Yes. The JSHC3878 is a 3/8-16 screw with a UN thread form at 16 threads per inch, so it mates with any standard 3/8-16 UNC tapped hole or nut. Usable length is 7/8 inch, so your grip plus thread engagement has to fall inside that.
2) How big a counterbore do I need for a 3/8-16 socket head cap screw?
Size the counterbore off the head: head width runs 0.55 to 0.562 in. and head height 0.368 to 0.375 in. Drill the counterbore diameter above 0.562 in. with a flat bottom, and go at least 0.375 in. deep if you want the head flush or below the surface.
3) Can I use a socket head cap screw instead of a Grade 5 or Grade 8 hex head bolt?
That is the usual reason to pick one. The alloy steel socket head cap screw gives higher tensile strength than the same size Grade 5 or Grade 8 hex head cap screw, and because it is wrenched internally with a hex key it needs less surface area or counterbore around the head. Rated at 180,000 psi minimum tensile and 162,000 psi minimum yield.
4) Do these Metallics socket head cap screws meet a recognized dimensional standard for spec work?
They are built to ASME B18.3-2012, the standard for socket cap screws and hex keys. If your drawing calls out a B18.3 socket head cap screw in 3/8-16, this matches that callout dimensionally.
5) Can I use these on a federal or Buy American job?
No. The JSHC3878 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. If your contract carries a domestic sourcing requirement, you need a certified domestic fastener instead.
6) What tool drives the JSHC3878 cap screw?
It takes a hex key (Allen) in the socket head, not a wrench on the outside. Socket head, hex drive. On tight assemblies that means you need clearance above the head for the key rather than swing room around it.
7) Is the black finish on these alloy steel cap screws suitable for outdoor or wet locations?
These are alloy steel with a black finish, which is a plain, non-plated appearance rather than a corrosion barrier like zinc or stainless. Fine for dry interior mechanical, electrical, and mechanical-room work. For exposed exterior or damp conditions, specify a plated or stainless cap screw instead.
8) How are Metallics JSHC3878 cap screws packaged and what is the minimum order?
They ship in a jar, with a 100-piece minimum per jar. Plan purchasing in jar quantities rather than loose counts.
9) How hard are these socket head cap screws, and will they gall or strip in the socket?
Hardness is Rockwell C39, which is in the normal range for alloy steel socket cap screws and is why the hex socket takes high torque without rounding out, provided you use a properly fitting hex key fully bottomed in the socket.
10) What trades normally use these black alloy socket head cap screws?
They are stocked for electrical, plumbing, heating, and air conditioning work, typical uses being equipment mounting, strut and bracket connections, and machine assembly where a high strength screw has to sit in a counterbore.
How fast can I get the Metallics JSHC3878 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 JSHC3878 come with a warranty?
Absolutely. The Metallics JSHC3878 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 JSHC3878?
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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