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Screw 1/4-20 x 1/2 Truss PH MS 18-8 (Jar 100)
Manufacturer Resources
Product Specs
- Division:
- Electrical H1
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Screws
Metallics JTMP99SS – Frequently Asked Questions
1) What size and thread is the Metallics JTMP99SS truss head screw?
The JTMP99SS is a 1/4-20 x 1/2 inch truss head machine screw. The 1/4-20 callout means a 1/4 inch diameter body with 20 threads per inch, so it mates with a 1/4-20 tapped hole or a 1/4-20 nut. Overall length under the head is 1/2 inch, which is short, so it is meant for thin material or a tapped boss rather than a deep stack-up.
2) Are these 1/4-20 truss head screws stainless steel, and will they hold up outdoors?
These are 18-8 stainless. 18-8 is the common austenitic grade (roughly 18 percent chromium, 8 percent nickel) used for general corrosion resistance, so it suits damp locations, exterior enclosures and washdown areas far better than a plain or zinc plated screw. It is not a hardened fastener, so torque it to a machine screw spec and do not treat it like a grade 5 or 8 bolt.
3) Will a 1/4-20 x 1/2 machine screw thread into a self-tapping hole or does it need a nut?
Machine screws like the JTMP99SS have a straight machine thread, not a sheet metal or wood thread, so they need a mating 1/4-20 tapped hole, a 1/4-20 nut, or a 1/4-20 threaded insert or channel nut. They will not form their own thread in plain sheet. If you are fastening into unthreaded sheet metal, use a self-drilling or sheet metal screw instead.
4) Why use a truss head screw instead of a pan or round head?
A truss head has a wide, low profile crown. The larger bearing surface spreads load over sheet metal, oversized holes and slots without pulling through, and the low dome keeps the head from interfering with anything mounted over it. Pick a pan head when you need a smaller footprint, and a flat head when the fastener has to sit flush in a countersink. The JTMP99SS is the truss head version in 1/4-20 x 1/2 inch.
5) How many 1/4-20 x 1/2 truss head screws come in a jar?
One hundred screws per jar, supplied in a jar pack rather than a box or bag. That is the practical bench or van quantity for an electrician or MRO tech doing repeat enclosure, strut and panel work, and the jar keeps them sorted on a shelf.
6) What driver do I need for the JTMP99SS screws?
They are Phillips drive truss head screws, so a #2 Phillips bit covers a 1/4-20 head in this size. Run them with a clutch or low torque setting; stainless machine screws will gall or snap the head before plain steel does if you lean on them.
How fast can I get the Metallics JTMP99SS delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
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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 JTMP99SS come with a warranty?
Absolutely. The Metallics JTMP99SS 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 JTMP99SS?
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