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Screw 4-40 x 1/2 RH PH MS St-Zn (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 JRMP30 – Frequently Asked Questions
1) Will a 4-40 x 1/2 round head screw work for mounting electrical devices or plates?
4-40 is a small-diameter thread, and the JRMP30 is stocked as an electrical fastener, so it suits light device, fixture and enclosure hardware tapped 4-40. It is not the 6-32 screw used for standard switch and receptacle mounting or wall plates in the US, and it will not thread into a 6-32 hole. Check the tapped hole before ordering.
2) How many screws come in a jar of Metallics JRMP30?
100 screws per jar. The JRMP30 is sold as a jar pack, which is the usual way an electrician or maintenance tech buys small machine screws for the truck or the shop bench rather than counting them out loose.
3) Is the Metallics JRMP30 screw corrosion resistant enough for outdoor or damp locations?
The JRMP30 is steel with zinc plating, which handles dry interior and general indoor service. Zinc plated steel is not a marine or sustained wet-location finish, so for exterior boxes, wash-down areas or coastal exposure specify a stainless 4-40 machine screw instead.
4) Does a round head Phillips screw sit flush, or does the head stand above the surface?
Round head means the head stands proud of the surface with a domed top and a flat bearing face underneath. It does not sit flush and it does not need a countersunk hole. If your part is countersunk for a flush finish, you want a flat head 4-40 instead of the JRMP30.
5) What is the exact manufacturer part number to order this 4-40 x 1/2 screw by?
Order it as Metallics part number JRMP30. That number covers the 4-40 x 1/2 round head Phillips steel zinc machine screw in the 100-piece jar.
How fast can I get the Metallics JRMP30 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 JRMP30 come with a warranty?
Absolutely. The Metallics JRMP30 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 JRMP30?
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 JRMP30 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.