Metallics JFM30 4-40 x 1/2 in....
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Metallics JFM30 4-40 x 1/2 in. Flat Head Slotted Machine Screws - Steel Zinc - 100qty

Metallics JFM30 4-40 x 1/2 in. Flat Head Slotted Machine Screws - Steel Zinc - Each

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Model: JFM30
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4-40 x 1/2 in. Flat Head Slotted Machine Screws - Steel Zinc - 100qty

  • Features

    • Zinc yellow screws are popular in electronics applications.
    • 4-40 Diameter, 1/2" Length
    • Flat head with slotted Drive
    • Steel Zinc Material

  • Additional Notes

    • Other sizes and quantities available by request | Hardness and tensile strength standards are offered as guides only for stainless machine screws. There is currently no national standard for these performance requirements for stainless machine screws.

Manufacturer Resources

Product Specs

Minimum Purchase:
100 units
Arra Compliant:
N
Buy American Compliant:
No
Dimensional Standard:
ASME B18.6.3-1998
Division:
Electrical H1
Drive Type:
Slotted
Fastener Head Height:
0.055 - 0.067 in.
Fastener Head Type:
Flat
Fastener Head Width:
0.191 - 0.212 in.
Fastener Length:
2-Jan
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-Flat_Head_Mach_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:
0.18 lbs
Product Width:
3 in
Slot Depth:
0.02 - 0.03
Slot Width:
0.031 - 0.039
Sub Division:
Electrical-E H2
Tensile Strength:
360 lb minimum
Thread Per Inch:
40
Thread Standard:
ANSI/ASME B1.1
Thread Type:
UNC
Department:
Electrical
Product Subgroup:
Screws
Product Type:
Machine Screw
Type2:
Machine Screw
Series:
FM and FMP
Product Finish:
Zinc
Product Details:
Machine Screw
Product Material:
Steel Zinc

Metallics JFM30 – Frequently Asked Questions

1) Will a 4-40 x 1/2 in. flat head machine screw sit flush in a countersunk hole?
Yes, the Metallics JFM30 is a flat head screw, so it seats flush in a countersunk or chamfered hole. The head measures 0.191 to 0.212 in. across and 0.055 to 0.067 in. high, so the countersink needs to be at least that diameter for the head to drop level with the surface.
2) Is the JFM30 machine screw thread coarse or fine, and will it match a 4-40 tapped hole or nut?
It is 4-40 UNC, 40 threads per inch, cut to ANSI/ASME B1.1. That is the standard coarse thread for a #4 screw, so it mates with any 4-40 tapped hole, 4-40 nut, or 4-40 threaded insert. It will not thread into a 4-48 fine-thread hole.
3) Are these screws Buy American or ARRA compliant for a government job?
No. The JFM30 machine screws are not Buy American compliant and are not ARRA compliant, and country of origin is listed as multiple. If your project carries a domestic sourcing requirement, these will not satisfy it.
4) What screwdriver do I need for the Metallics JFM30 screws?
A flat blade. These are slotted drive, with a slot 0.031 to 0.039 in. wide and 0.02 to 0.03 in. deep, so a small cabinet-tip or electrician's screwdriver with a blade thin enough to bottom in that slot is what you want. Not Phillips.
5) Are these 4-40 screws sold individually or do I have to buy a whole jar?
They ship in a jar, with a 100-piece minimum order. So the smallest quantity you can take is one 100-count jar of the 4-40 x 1/2 in. flat head slotted screws, weighing about 0.18 lbs.
6) Can I use these zinc machine screws outdoors or in a damp location?
Keep them dry. The JFM30 is carbon steel (AISI 1006-1022) with a zinc finish, which handles indoor panel, box, and device work but is not a stainless screw. For wet, washdown, or exterior locations, specify a stainless 4-40 machine screw in the same 1/2 in. length instead.
7) How much load will a 4-40 x 1/2 in. steel zinc machine screw hold?
360 lb minimum tensile is the rated figure for these screws, with a hardness of Rockwell B70-B100. That is plenty for securing devices, plates, terminal strips, and small brackets, which is what a #4 screw is used for. It is not a structural fastener.
8) Do these Metallics screws meet a recognized dimensional spec for submittals?
The head, slot, and body dimensions conform to ASME B18.6.3-1998, the standard for inch-series machine screws, and the threads to ANSI/ASME B1.1. Those are the two designations to list on a submittal for the 4-40 x 1/2 in. flat head slotted screw.
9) What are 4-40 flat head slotted machine screws typically used for?
They are a small-diameter assembly screw aimed at the electrical, plumbing, and HVAC trades, and the zinc yellow version is common in electronics work. At 1/2 in. long with a flush-seating flat head, the usual jobs are fastening device plates, mounting small brackets and terminal blocks, and replacing lost screws in control and panel assemblies.
How fast can I get the Metallics JFM30 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 JFM30 come with a warranty?
Absolutely. The Metallics JFM30 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 JFM30?
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 JFM30 from ZenSupply?
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