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Features
- Alloy Steel Black Material
- 1/4-20 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.
- 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)
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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:
- 0.244 - 0.25 in.
- Fastener Head Type:
- Socket
- Fastener Head Width:
- 0.365 - 0.375 in.
- Fastener Length:
- 8-Jul
- Field Application:
- Electrical, Plumbing, Heating and Air Conditioning Industries
- Hardness:
- Rockwell C39
- Hex Size:
- 16-Mar
- 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:
- 2.7 in
- Product Length:
- 3 in
- Product Weight:
- 1.52 lbs
- Product Width:
- 3 in
- Slot Depth:
- 0.12
- Sub Division:
- Electrical-E H2
- Tensile Strength:
- 180000 psi minimum
- Thread Per Inch:
- 20
- Thread Type:
- UN
- Wall Thickness:
- 0.095
- 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 JSHC1478 – Frequently Asked Questions
1) Is a 1/4-20 socket head cap screw stronger than a Grade 5 or Grade 8 hex head bolt of the same size?
Yes. This alloy steel socket head cap screw runs 180,000 psi minimum tensile and 162,000 psi minimum yield, which is above equivalent sizes of Grade 5 or Grade 8 hex head cap screws. Hardness is Rockwell C39. The other practical gain is that because it is internally wrenched, it needs less surface area or counterbore clearance than an externally wrenched hex head.
2) Will this 1/4-20 screw thread into a standard 1/4-20 tapped hole or nut?
Yes. It is a 1/4-20 UN thread at 20 threads per inch, which is standard 1/4 inch coarse (UNC) pitch, so it mates with any 1/4-20 tapped hole, nut, or strut channel nut. Usable length is 7/8 inch, so your grip plus engagement has to fall inside that.
3) What counterbore diameter and depth do I need for the head on a 1/4-20 socket head cap screw?
Size the counterbore off a head width of 0.365 to 0.375 inch and a head height of 0.244 to 0.25 inch. Add clearance to the diameter so the head drops in, and make the bore at least 1/4 inch deep if you want the head flush or below the surface. Head geometry on this screw follows ASME B18.3-2012.
4) Are Metallics JSHC1478 cap screws Buy American or ARRA compliant for a government job?
No. The JSHC1478 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your project carries a domestic-content requirement, this part will not satisfy it.
5) Does this socket head cap screw meet a dimensional standard I can put on a submittal?
It is built to ASME B18.3-2012, the dimensional standard for socket head cap screws and hex keys. That is the figure to cite on a submittal or spec sheet for head diameter, head height, and socket size.
6) How are these Metallics cap screws packaged and what is the minimum I can order?
They ship in a jar, with a minimum order of 100 pieces (one jar). Other sizes and quantities are available by request.
7) Is the black finish on these alloy steel cap screws suitable for outdoor or wet locations?
Treat them as indoor or dry-location fasteners. The material is alloy steel with a black finish, which is an oxide-type appearance finish, not a corrosion barrier like hot-dip galvanizing or stainless. For exterior, damp, or corrosive environments, specify a galvanized or stainless fastener instead.
8) Can I use alloy steel socket head cap screws for electrical and mechanical equipment mounting?
That is the intended use. These are specified for the electrical, plumbing, heating and air conditioning trades, which covers panel and enclosure hardware, equipment mounting, strut and bracket work. The compact internally wrenched head is useful where there is no room to swing a wrench on a hex head.
How fast can I get the Metallics JSHC1478 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 JSHC1478 come with a warranty?
Absolutely. The Metallics JSHC1478 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 JSHC1478?
You can call, text, or email our expert support team for fast answers. We’re here to help with
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