Metallics JRM71 5/16-18 x 1-1/...
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Metallics JRM71 5/16-18 x 1-1/4 in. Round Head Combo Machine Screws - Steel Zinc - 100qty

Metallics JRM71 5/16-18 x 1-1/4 in. Round Head Combo Machine Screws - Steel Zinc - Each

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Model: JRM71
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5/16-18 x 1-1/4 in. Round Head Combo Machine Screws - Steel Zinc - 100qty

  • Additional Notes

    • In 1985, Metallics was the first fastener company in America to offer a full line of Combo’s! | 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

    • Two Drives in one Head
    • Steel Zinc Material
    • 5/16-18 Diameter, 1-1/4" Length
    • Round head with slotted and Phillips Drive

Manufacturer Resources

Product Specs

Minimum Purchase:
100 units
Arra Compliant:
N
Buy American Compliant:
No
Division:
Electrical H1
Drive Type:
Slotted/Phillips
Driver Size:
#3
Fastener Head Height:
0.198 - 0.216 in.
Fastener Head Type:
Round
Fastener Head Width:
0.557 - 0.59 in.
Fastener Length:
1/1/04
Field Application:
Electrical, Plumbing, Heating and Air Conditioning Industries
Hardness:
Rockwell B70-B100
Language Code:
EN
Material Standard:
AISI 1006 - 1022
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
Phillips Recess Depth:
0.161 - 0.187
Phillips Recess Diameter:
0.295 - 0.308
Phillips Recess Width:
0.04
Product Group:
Fasteners
Product Height:
4.57 in
Product Length:
3 in
Product Weight:
3.11 lbs
Product Width:
3 in
Recess Penetration Gaging Depth:
0.144 - 0.170
Slot Depth:
0.099 - 0.132
Slot Width:
0.072 - 0.084
Sub Division:
Electrical-E H2
Tensile Strength:
60000 psi minimum
Thread Per Inch:
18
Department:
Electrical
Product Subgroup:
Screws
Product Type:
Machine Screw
Type2:
Machine Screw
Series:
JRM
Product Finish:
Zinc
Product Details:
Machine Screw
Product Material:
Steel Zinc

Metallics JRM71 – Frequently Asked Questions

1) What driver do I need for the Metallics JRM71 combo machine screw?
Either a flat blade or a #3 Phillips. The JRM71 has a combination head, slotted and Phillips in the same recess, so whatever is already on the truck works. Phillips recess measures 0.295 to 0.308 inch diameter and 0.161 to 0.187 inch deep; the slot runs 0.072 to 0.084 inch wide and 0.099 to 0.132 inch deep.
2) Will a 5/16-18 machine screw thread into my existing panel or box tapped holes?
The JRM71 is a 5/16-18 thread, 18 threads per inch, which is the standard coarse (UNC) pitch for 5/16 inch. It mates with any 5/16-18 tapped hole or nut. If the hole in your equipment is 5/16-24 fine thread, this is the wrong screw.
3) Do these Metallics screws meet Buy American or ARRA requirements for a public job?
No. The JRM71 is not Buy American compliant and is not ARRA compliant; country of origin is multiple. On federally funded work with a domestic sourcing clause, you need a domestically produced fastener instead.
4) How much does the round head stand up off the surface, and how wide is it?
Head height on the JRM71 runs 0.198 to 0.216 inch and head diameter 0.557 to 0.59 inch. That domed round profile sits proud of the surface, so if you need the fastener flush in a countersunk hole, go to a flat head instead. The 0.59 inch maximum head also needs to clear any adjacent bracket or raceway edge.
5) Is a zinc plated steel machine screw okay outdoors or in a wet location?
Zinc plated steel is a dry, indoor-grade finish. The JRM71 is AISI 1006-1022 carbon steel with zinc plating, which handles interior panel, box, and device work but will corrode in exposed, washdown, or coastal conditions. For those, specify a stainless machine screw in the same 5/16-18 x 1-1/4 size.
6) How strong is the Metallics JRM71 screw, and can I torque it down hard?
Minimum tensile strength is 60,000 psi, with a case hardness of Rockwell B70 to B100. That is standard low-carbon machine screw strength, fine for mounting panels, devices, straps, and brackets. It is not a grade 5 or grade 8 cap screw, so do not use it where a structural bolt is specified on the drawing.
7) How are the JRM71 screws packaged and what is the minimum order?
They ship in a jar of 100, and a jar is the order minimum. Jar weight is listed at 3.11 lbs. Metallics does offer other sizes and quantities of the combo line by request.
8) What trades and jobs is this combo machine screw actually meant for?
Metallics built the JRM line for electrical, plumbing, heating and air conditioning work, the kind of 5/16-18 panel, strap, and enclosure fastening those trades do daily. The dual slotted and Phillips head is the reason it travels well on a service van: one screw, either driver. Metallics was the first US fastener company to offer a full combo line, back in 1985.
How fast can I get the Metallics JRM71 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 JRM71 come with a warranty?
Absolutely. The Metallics JRM71 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 JRM71?
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 JRM71 from ZenSupply?
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