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Screw M4 x 12mm PN 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 JMPMP412SS – Frequently Asked Questions
1) What size and thread is the Metallics JMPMP412SS machine screw?
It's an M4 x 12mm metric machine screw, pan head with a Phillips drive. M4 is the nominal 4mm thread diameter and 12mm is the length under the head, so you need a tapped M4 hole or an M4 nut to take it.
2) Will a pan head Phillips screw sit flush in a countersunk hole?
No. The JMPMP412SS has a pan head, which is a rounded head that seats on top of the surface, not down into it. If your part is countersunk and you need the head flush, you want a flat head machine screw instead. Pan head is the right pick for a flat, untapered through-hole or a tapped blind hole.
3) Will an M4 screw work in a hole tapped for #8-32 or #6-32?
No. M4 is a metric thread and will not mate with imperial UNC or UNF threads. M4 falls between a #6 and a #8 in diameter, so it may start in a #8-32 hole and strip it. If the equipment is US-standard, order the imperial size; the JMPMP412SS is for metric-threaded assemblies only.
4) Are these Metallics M4 screws stainless, and will they hold up outdoors or in damp areas?
They're 18-8 stainless steel, the common austenitic grade (roughly 18% chromium, 8% nickel) used for general corrosion resistance. That makes them a reasonable choice for damp interiors, outdoor enclosures and washdown-adjacent work. For direct salt spray or coastal exposure, 316 stainless is the step up.
5) How many screws come in the Metallics JMPMP412SS pack?
100 screws, packed in a jar rather than a bag or box. The jar is what keeps a bench or van stock organized when you're pulling a few M4 screws at a time, and it's the format MRO and electrical stockrooms usually want for a fastener kept on the shelf.
6) Can I use these M4 stainless screws for device and panel work in an electrical enclosure?
That's the intended use. Metallics catalogs the JMPMP412SS as an electrical fastener, and an M4 x 12mm pan head Phillips in 18-8 stainless is the usual screw for metric-tapped enclosure doors, DIN rail hardware, terminal blocks, and imported panel components. Check the tapped hole depth takes 12mm of thread.
7) Is the Metallics M4 x 12mm screw self-tapping or does it need a tapped hole?
It's a machine screw, so the thread is straight and uniform along its length and it will not cut its own thread in sheet metal. You need either an M4 tapped hole, an M4 nut, or an M4 insert. For a screw that forms its own thread into unthreaded metal, you want a self-tapping or thread-forming screw instead.
8) Will these stainless screws gall when I drive them into a stainless tapped hole?
18-8 stainless on stainless can gall, which is stainless threads cold-welding under friction and seizing mid-drive. Driving slow by hand rather than with a high-speed driver, and using an anti-seize on the thread, is the normal way around it. Into aluminum or steel-tapped holes, this isn't a concern.
How fast can I get the Metallics JMPMP412SS delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 JMPMP412SS come with a warranty?
Absolutely. The Metallics JMPMP412SS 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 JMPMP412SS?
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