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Bolts 1/4-20 x 3/4 Hx SL MS St-zn (Jar 1000)
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
- Fastener Head Type:
- Hex
- Fastener Head Width:
- 0.367 - 0.375 in.
- Fastener Height:
- 0.172 - 0.190
- Fastener Length:
- 4-Mar
- Fastener Width:
- 0.409
- 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:
- 1000
- Order Minimum Uom Imperial:
- TH
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 6 in
- Product Length:
- 7.25 in
- Product Weight:
- 5788 g
- Product Width:
- 158.75 MM
- Remarks:
- The catalog UPC differ from the tarnsaction daat spreadsheet UPC
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 20
- Thread Pitch:
- 0.25
- Thread Standard:
- ANSI/ASME B1.1
- Thread Type:
- UNC
- Washer Od:
- 0.480 - 0.520 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 JHHMS89M – Frequently Asked Questions
1) Is the Metallics JHHMS89M a 1/4-20 machine screw or a tapping screw, and will it thread into a tapped hole?
It's a machine screw, not a self-tapping fastener. The thread is 1/4-20 UNC cut to ANSI/ASME B1.1, with 20 threads per inch, so it mates with any standard 1/4-20 tapped hole, nut, or threaded strut insert. It will not form its own thread, so the hole has to be tapped or you need a nut on the back side. Nuts and washers aren't part of the pack.
2) What wrench or socket size do I need for these 1/4-20 hex slotted machine screws?
The hex head measures 0.367 to 0.375 inch across, which is a nominal 3/8 inch wrench or socket. The head is also slotted, so a flat blade driver works where a wrench won't reach, handy inside a box or behind a panel. Head height runs 0.172 to 0.190 inch, so it sits low enough to clear most cover plates.
3) How many screws come in a jar of Metallics JHHMS89M, and can I buy a smaller quantity?
They ship in a jar of 1,000, and 1,000 is the order minimum, so that jar is the smallest unit. If you need a different length or a smaller count, Metallics lists other sizes and quantities as available by request.
4) Will zinc plated steel machine screws hold up in a damp or outdoor electrical enclosure?
The screws are plain steel with a zinc finish. Zinc plating handles dry indoor work and normally damp locations fine, but it isn't stainless. For wet locations, coastal exposure, or anything washed down or exposed to chemicals, specify a stainless 1/4-20 machine screw instead of zinc plated steel.
5) What dimensional standard do these hex slotted machine screws meet, so I know they match my spec?
Head and body dimensions follow ASME B18.6.3-2002, the standard for inch-series machine screws, and the thread follows ANSI/ASME B1.1. That pairing is what submittal reviewers usually want to see on a 1/4-20 machine screw callout, and it means the 3/8 inch head will match other B18.6.3 hex slotted screws already in the job.
6) Where are Metallics JHHMS89M machine screws made?
Country of origin on the JHHMS89M is China. If your contract requires domestically produced fasteners, confirm that against your own procurement language before you commit to this part number.
How fast can I get the Metallics JHHMS89M delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 JHHMS89M come with a warranty?
Absolutely. The Metallics JHHMS89M 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 JHHMS89M?
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