Metallics JRMB99 1/4-20 x 1/2 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.86
Metallics JRMB99 1/4-20 x 1/2 in. Round Head Slotted Machine Screws - Brass - 100qty

Metallics JRMB99 1/4-20 x 1/2 in. Round Head Slotted Machine Screws - Brass - Each

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Model: JRMB99
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$192.86
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1/4-20 x 1/2 in. Round Head Slotted Machine Screws - Brass - 100qty

  • Additional Notes

    • Other sizes and quantities available by request | Tensile strength values for stainless screws are offered as approximations only; there is no single standard for the performance requirements of stainless machine screws.

  • Features

    • Round head with slotted Drive
    • 1/4-20 Diameter, 1/2" Length
    • Brass Material

Manufacturer Resources

Product Specs

Minimum Purchase:
100 units
Arra Compliant:
N
Buy American Compliant:
No
Dimensional Standard:
ASME B18.6.3
Division:
Electrical H1
Drive Type:
Slotted
Fastener Head Height:
0.16 - 0.175 in.
Fastener Head Type:
Round
Fastener Head Width:
0.443 - 0.472 in.
Fastener Length:
2-Jan
Field Application:
Electrical, Plumbing, Heating and Air Conditioning Industries
Language Code:
EN
Neurspe:
https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Round_Head_Machine_Screw.pdf
Order Minimum Imperial:
100
Order Minimum Uom Imperial:
JR
Pack Type:
Jar
Product Group:
Fasteners
Product Height:
2.15 in
Product Length:
3 in
Product Weight:
1 lbs
Product Width:
3 in
Recess Penetration Gaging Depth:
0.104 - 0.130
Slot Depth:
0.082 - 0.109
Slot Width:
0.064 - 0.075
Sub Division:
Electrical-E H2
Thread Per Inch:
20
Thread Standard:
ANSI/ASME B1.1
Department:
Electrical
Product Subgroup:
Screws
Product Type:
Machine Screw
Type2:
Machine Screw
Series:
JRMB
Product Details:
Machine Screw
Product Material:
Brass

Metallics JRMB99 – Frequently Asked Questions

1) Will a 1/4-20 brass machine screw thread into a standard 1/4-20 tapped box or strap?
Yes. The Metallics JRMB99 is cut to 20 threads per inch on a 1/4 inch diameter to ANSI/ASME B1.1, so it mates with any standard 1/4-20 tapped hole or nut, including tapped lugs, straps, and box bosses. Overall screw length is 1/2 inch, so your tapped depth plus any material thickness has to stay inside that.
2) How much does the round head sit above the surface, and will it clear a cover plate?
Head height on these round head slotted screws runs 0.16 to 0.175 inch, with a head width of 0.443 to 0.472 inch. That is a domed head that stands proud of the surface, so it needs clearance behind a flush cover. For a flush or recessed finish you want a flat head screw instead, not this round head.
3) Do these screws qualify for a Buy American or ARRA funded project?
No. Metallics lists the JRMB99 as not Buy American compliant and not ARRA compliant, with country of origin recorded as multiple. On a federally funded job with domestic sourcing requirements, you need a domestically manufactured brass machine screw instead.
4) Why pick a brass machine screw instead of steel or stainless for an electrical ground connection?
Brass is the body material on the JRMB99, which makes it the usual choice where you want a conductive, non-magnetic, corrosion-resistant fastener, such as bonding to brass or copper parts where mixing in plain steel invites galvanic trouble. Metallics notes these screws for electrical, plumbing, heating and air conditioning work. Brass is softer than steel, so it is not the screw for high-torque structural clamping.
5) Are these brass machine screws made to a recognized dimensional standard for spec jobs?
Head and drive dimensions follow ASME B18.6.3, the standard for inch-series machine screws, and the thread follows ANSI/ASME B1.1. That is what a submittal reviewer looks for when the drawing calls out a standard round head slotted machine screw rather than a proprietary fastener.
6) How do these Metallics machine screws come packaged, and is there a minimum order?
They ship in a jar of 100, which is the order minimum. Jar weight is listed at 1 lb, and the container measures 3 in by 3 in by 2.15 in, which is worth knowing if you are stocking a van drawer or a parts bin.
7) Can I get the same brass round head screw in a longer length or a different quantity?
Metallics offers other sizes and quantities in the JRMB round head slotted brass series by request. The JRMB99 itself is fixed at 1/4-20 by 1/2 inch in a 100 piece jar, so if your tapped depth or stack-up needs more than 1/2 inch of screw, ask for the longer length in the same series rather than forcing this one.
How fast can I get the Metallics JRMB99 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 JRMB99 come with a warranty?
Absolutely. The Metallics JRMB99 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 JRMB99?
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
Why buy the Metallics JRMB99 from ZenSupply?
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