Metallics JRMB78 8-32 x .3 in....
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$385.71
Metallics JRMB78 8-32 x .3 in. Round Head Slotted Machine Screws - Brass - 100qty

Metallics JRMB78 8-32 x .3 in. Round Head Slotted Machine Screws - Brass - Each

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Model: JRMB78
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$385.71
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8-32 x .3 in. Round Head Slotted Machine Screws - Brass - 100qty

  • Features

    • Brass Material
    • 8-32 Diameter, .3" Length
    • Round head with slotted Drive

  • 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.

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:
0.107 - 0.12 in.
Fastener Head Type:
Round
Fastener Head Width:
0.287 - 0.309 in.
Fastener Length:
3
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:
4.57 in
Product Length:
3 in
Product Weight:
1.646 lbs
Product Width:
3 in
Recess Penetration Gaging Depth:
0.064 - 0.090
Slot Depth:
0.058 - 0.077
Slot Width:
0.045 - 0.054
Sub Division:
Electrical-E H2
Thread Per Inch:
32
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 JRMB78 – Frequently Asked Questions

1) Will an 8-32 brass machine screw thread into a standard electrical box or device yoke?
8-32 is the standard thread used on outlet boxes, device straps and cover plates, and the Metallics JRMB78 is cut to 8-32 with 32 threads per inch to the ANSI/ASME B1.1 thread standard, so it mates with any clean 8-32 tapped hole or nut. The brass body makes it a common pick where a non-ferrous or bonding-friendly screw is wanted.
2) How long is the Metallics JRMB78 screw, and is it long enough for a cover plate?
Short screw: the JRMB78 is 8-32 x .3 inch, so you get roughly a quarter inch of usable thread past the head. That suits a cover plate, a device strap, or anything where the tapped hole is right behind the surface. If you are stacking a spacer, a plaster ring, or anything thicker, you want a longer 8-32 in the same series rather than this one.
3) Will a round head slotted screw sit flush, or does the head stand above the surface?
It stands proud. Round head means a domed head that bears on the surface rather than sinking into it, and the head measures 0.107 to 0.12 inch in height and 0.287 to 0.309 inch across. If your part has a countersunk or chamfered hole, you want a flat head instead, because a round head will rock in a countersink.
4) Are brass machine screws acceptable on a Buy American or ARRA job?
No. The JRMB78 is listed as not Buy American compliant and not ARRA compliant, with multiple countries of origin. For a federally funded job carrying domestic sourcing language, you need a domestically produced fastener instead.
5) Do these brass machine screws meet a dimensional standard I can put on a submittal?
Head and body dimensions are built to ASME B18.6.3, the standard for machine screw head styles, and the thread conforms to ANSI/ASME B1.1. Those are the two designations a spec reviewer looks for on a round head machine screw.
6) How are the Metallics JRMB78 screws packaged and what is the minimum I can buy?
They ship in a jar of 100, and 100 is the order minimum. Figure one jar as the base buy unit rather than loose counts.
7) Why choose brass over steel or stainless for an 8-32 machine screw?
Brass is non-magnetic and resists corrosion in damp interior conditions, and it matches brass trim and terminal hardware. It is softer than steel, so it will strip or shear sooner under high torque. Metallics lists this screw for electrical, plumbing, and heating and air conditioning work, which is where that trade-off is usually acceptable.
8) Can I get the same 8-32 round head brass screw in a different length or pack count?
Yes. The JRMB series runs other lengths and quantities, available by request, so if .3 inch is too short for your stack you can be matched to a longer screw in the same head, drive, and material.
How fast can I get the Metallics JRMB78 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 JRMB78 come with a warranty?
Absolutely. The Metallics JRMB78 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 JRMB78?
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 JRMB78 from ZenSupply?
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