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Bolts 1/4-20 X 1 Hx Sl Ms St-zn (Jar 100)
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:
- 1
- 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:
- 100
- Order Minimum Uom Imperial:
- CT
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 2.7 in
- Product Length:
- 3 in
- Product Weight:
- 640 g
- Product Width:
- 76.2 MM
- 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 JHHMS90 – Frequently Asked Questions
1) What thread does the Metallics JHHMS90 machine screw use, and will it take a standard 1/4-20 nut?
It's a 1/4-20 UNC thread, 20 threads per inch, made to ANSI/ASME B1.1. That's the standard coarse series, so any off-the-shelf 1/4-20 nut, coupling, or tapped 1/4-20 hole in a box or enclosure will take it.
2) What size wrench or socket fits the hex head on the JHHMS90?
Head width across the flats runs 0.367 to 0.375 inch, so a 3/8 inch wrench or socket is the fit. The head is also slotted, so you can drive it with a flat blade screwdriver where a wrench won't reach, which is the usual case inside a crowded box.
3) Does the JHHMS90 machine screw meet Buy American and ARRA requirements for a federally funded job?
The record flags it as compliant for both ARRA and Buy American. Country of origin is China. If your contract language turns on domestic melt and manufacture rather than the compliance flag, read that clause before you submit it.
4) Is a 1/4-20 hex slotted machine screw the right choice, or should I be using a self-tapping screw?
A machine screw like this one has a straight 1/4-20 UNC machine thread with no point, so it needs a pre-tapped hole or a nut on the back side. If you are fastening into bare sheet metal with no tapped hole and no access behind it, a self-drilling or self-tapping screw is the right call instead. For strut, pre-tapped enclosure bosses, fixture channels, and anywhere you can get a nut on, the machine screw is the stronger, reusable joint.
5) How long are these 1/4-20 hex slotted machine screws, and how much material can they go through?
The screw is 1 inch long under the head. Figure on roughly 1 inch of combined grip, so sheet metal plus a nut, or a tapped hole up to about that depth. For thicker stacks you'd need a longer screw in the same JHHMS series.
6) Is this an indoor-only screw or will zinc plating hold up outside?
The screw is steel with a zinc finish. Zinc plating is a dry and damp interior coating, fine for panels, enclosures, strut, and fixture work. For sustained outdoor exposure, wash-down areas, or anywhere salt is present, go to stainless instead of plated steel.
7) How many screws come in a jar, and is there a minimum order?
They ship 100 to a jar, and the order minimum is 100 count, so one jar is the smallest buy. The jar weighs 640 g. Other sizes and quantities in the same hex slotted machine screw line can be had by request.
8) What dimensional standard do these hex slotted machine screws conform to?
Head and body geometry follow ASME B18.6.3-2002, the standard for machine screws, and the thread follows ANSI/ASME B1.1. If a submittal calls for B18.6.3 machine screws, this answers it.
How fast can I get the Metallics JHHMS90 delivered?
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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 JHHMS90 come with a warranty?
Absolutely. The Metallics JHHMS90 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 JHHMS90?
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