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Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- C
- Buy American Compliant:
- C
- Dimensional Standard:
- ASME B18.6.3-2002
- Division:
- Electrical H1
- Drive Type:
- Slotted
- Driver Size:
- 3
- Fastener Head Color:
- Silver
- Fastener Head Height:
- 0.155-0.139 in.
- Fastener Head Type:
- Hex
- Fastener Head Width:
- 0.305 - 0.312 in.
- Fastener Height:
- 0.139 - 0.155
- Fastener Length:
- 4-Mar
- Fastener Width:
- 0.34
- Language Code:
- EN
- Neurspe:
- https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Hex_Head_Slotted_Machine_Screw_St-Zn.pdf
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- CT
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 2.15 in
- Product Length:
- 3 in
- Product Weight:
- 449 g
- Product Width:
- 76.2 MM
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 24
- Thread Pitch:
- 0.216
- Thread Standard:
- ANSI/ASME B1.1
- Thread Type:
- UNC
- Washer Od:
- 0.398 - 0.432 in.
- Department:
- Electrical
- Product Subgroup:
- Bolts
- Product Type:
- Hexagonal Bolt
- Type2:
- Hexagonal Bolt
- Series:
- JHHMS
- Product Finish:
- Zinc
- Product Details:
- Hexagonal Bolt
- Product Material:
- Steel
Metallics JHHMS88 – Frequently Asked Questions
1) What size and thread is the Metallics JHHMS88 machine screw?
It's a 12-24 x 3/4 inch hex head slotted machine screw, so 24 threads per inch on a #12 body, made to the ANSI/ASME B1.1 thread standard. Note that 12-24 is the machine screw size commonly used for electrical device mounting and panel work, and it will only thread into a tapped hole or nut cut 12-24, not 12-28 or 10-32.
2) Can I drive these hex head machine screws with a screwdriver, or do I need a wrench?
Either works. The head is hex but it's also slotted, so you can run it with a flat blade driver (size 3 slotted tip) or put a 5/16 wrench or nut driver on the head when you need more torque. Head width across the flats is 0.305 to 0.312 inch, which is what a 5/16 socket grabs.
3) Do these meet Buy American requirements for a federal or public works job?
The JHHMS88 is flagged both Buy American compliant and ARRA compliant, which is what a government, school, or municipal procurement package normally asks for on fasteners. Country of origin is listed as multiple.
4) Are these zinc plated steel screws OK for damp or outdoor locations?
They're steel with a zinc finish, which is a general indoor and dry-location plating. Zinc gives light corrosion protection but it isn't a marine or sustained-wet finish, so for exterior, washdown, or coastal work go to a stainless machine screw instead.
5) How many screws come in a jar of Metallics JHHMS88, and is there an order minimum?
They ship in a jar of 100, and 100 count is the order minimum, so one jar is the smallest buy. The jar weighs 449 g. Metallics does make other sizes and quantities available on request if you need a different length or a bulk box for a standing MRO stock.
6) Does the Metallics JHHMS88 meet a dimensional spec I can put on a submittal?
Head and body dimensions are made to ASME B18.6.3-2002, the standard for inch-series machine screws, and the threads to ANSI/ASME B1.1. Those two references are what an engineer or inspector looks for on a fastener submittal.
7) Is UNC the same as the coarse thread I need for electrical device screws?
Yes, the thread is UNC (Unified National Coarse) at 24 TPI. For a #12 screw, 24 TPI is the coarse pitch, so it mates with any 12-24 tapped strap, box ear, or panel nut. Don't mix it with 12-28 fine thread hardware.
8) What size washer fits a 12-24 hex head machine screw like this one?
A washer with an outside diameter in the 0.398 to 0.432 inch range suits this screw. Washers and nuts are not included in the jar, so pick up 12-24 hex nuts or washers separately if you're not threading into a tapped hole.
How fast can I get the Metallics JHHMS88 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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U.S.
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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 JHHMS88 come with a warranty?
Absolutely. The Metallics JHHMS88 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 JHHMS88?
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installation tips, and troubleshooting. Contact Us
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