Metallics JRMB30 1/4-20 x 1 in...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.86
Metallics JRMB30 1/4-20 x 1 in. Round Head Slotted Machine Screws - Brass - 100qty

Metallics JRMB30 1/4-20 x 1 in. Round Head Slotted Machine Screws - Brass - Each

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Model: JRMB30
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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 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" 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:
1
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:
2.7 in
Product Length:
3 in
Product Weight:
1.59 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 JRMB30 – Frequently Asked Questions

1) How many screws come in a jar of Metallics JRMB30 1/4-20 machine screws?
The JRMB30 ships as a jar of 100 screws, and the jar is the minimum order quantity. If you need a count other than 100, Metallics states other sizes and quantities are available by request.
2) Will a 1/4-20 brass round head screw thread into a standard 1/4-20 tapped hole or coupling nut?
Yes. The JRMB30 is cut 20 threads per inch to ANSI/ASME B1.1, the Unified inch thread standard, so it mates with any standard 1/4-20 UNC tapped hole, nut, or strut channel nut.
3) Do these brass round head screws meet a dimensional standard for government or spec work?
Head and body dimensions conform to ASME B18.6.3, the standard covering inch machine screws, and the thread follows ANSI/ASME B1.1. Note for public-works bidding that the JRMB30 is not Buy American compliant and not ARRA compliant, with country of origin listed as multiple.
4) How much material can a 1-inch 1/4-20 round head machine screw actually grab?
Length is 1 inch measured under the round head, since round head screws are measured from the bearing surface of the head. Subtract the thickness of what you are fastening through to see how much thread is left for the nut or tapped hole. Head height adds roughly 0.16 to 0.175 inch above the surface, and the head spans 0.443 to 0.472 inch across.
5) Why use brass machine screws instead of steel or stainless for electrical work?
Brass is non-magnetic and corrosion resistant, which is why the JRMB30 is carried for the electrical, plumbing, and HVAC trades. It is the usual pick for grounding and bonding connections, brass terminal lugs, and fixture bodies where dissimilar-metal corrosion against a brass or copper part is the concern. Brass is softer than steel, so it is not the screw for a high-clamp structural joint.
6) What clearance hole should I drill for a 1/4-20 machine screw?
A 1/4-20 screw takes a 9/32 inch clearance hole for a standard fit, or 17/64 inch if you want it close. The round head spans 0.443 to 0.472 inch, so it covers either hole with bearing area to spare and no washer is strictly needed on a rigid surface.
7) Does a jar of 100 of these count toward a shipping weight I need to plan for?
A full jar of JRMB30 screws weighs 1.59 lbs, and the packed jar measures 3 inches in length, 3 inches in width, and 2.7 inches in height. Easy to carry several on a service van without eating shelf space.
How fast can I get the Metallics JRMB30 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 JRMB30 come with a warranty?
Absolutely. The Metallics JRMB30 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 JRMB30?
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 JRMB30 from ZenSupply?
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