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Manufacturer Resources
Product Specs
- Division:
- Electrical H1
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Screws
Metallics JTMSP144 – Frequently Asked Questions
1) What size and thread is the Metallics JTMSP144 truss head machine screw?
The JTMSP144 is a 1/4-20 x 4 inch truss head machine screw. The 1/4-20 designation means a 1/4 inch nominal diameter with 20 threads per inch, which is the standard coarse (UNC) thread for that diameter, so it mates with standard 1/4-20 nuts and tapped holes.
2) Will the JTMSP144 thread into a hole, or do I need a nut?
It is a machine screw, not a self-drilling or self-tapping screw. It needs a mating 1/4-20 nut or an existing 1/4-20 tapped hole, strut nut, or insert. If you are fastening into bare sheet metal with no prepared thread, you want a self-drilling or sheet metal screw instead.
3) Is the Metallics JTMSP144 screw plated for corrosion resistance, and can I use it outdoors?
The JTMSP144 is a steel screw with zinc plating (St-Zn). Zinc plating handles indoor and dry or protected locations well, which is typical for electrical box, strut and panel work. For sustained outdoor exposure, wet locations or coastal air, step up to stainless steel instead.
4) Why pick a truss head screw instead of a pan or round head for electrical work?
A truss head is wide and low-profile, so it spreads bearing load over a larger area and sits closer to the surface than a pan or round head. That is what you want through sheet metal, enclosure covers, oversized or slotted holes, and anywhere a taller head would interfere with a cover or a device. The JTMSP144 gives that head on a 1/4-20 x 4 inch machine screw.
5) What is the exact part number to order this 1/4-20 x 4 truss head screw?
Order Metallics part number JTMSP144. That one number covers the 1/4-20 x 4 inch combination-drive truss head machine screw in zinc-plated steel, jar of 100.
6) How many screws come in a jar of Metallics JTMSP144?
They ship as a jar of 100 screws. The jar pack is the usual MRO and service-truck quantity, so it suits stocking a van or a maintenance shop crib rather than buying loose counts.
7) Is 4 inches too long for my application, and can I cut it down?
At 4 inches the JTMSP144 is a long machine screw, meant for stacked assemblies, spacers, standoffs, or clamping through strut and a thick build-up. If your grip length is only an inch or two, the excess thread will protrude past the nut. Shortening a plated screw strips the zinc at the cut and exposes bare steel to corrosion, so it is better to order the length that matches the grip.
How fast can I get the Metallics JTMSP144 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 JTMSP144 come with a warranty?
Absolutely. The Metallics JTMSP144 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 JTMSP144?
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 JTMSP144 from ZenSupply?
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