Metallics RM129SLT 5/16-18 x 3...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.86
Metallics RM129SLT 5/16-18 x 3 in. Round Head Slotted Machine Screws - Steel Zinc - 100qty

Metallics RM129SLT 5/16-18 x 3 in. Round Head Slotted Machine Screws - Steel Zinc - Each

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Model: RM129SLT
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$192.86
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5/16-18 x 3 in. Round Head Slotted Machine Screws - Steel Zinc - 100qty

  • Additional Notes

    • In 1985, Metallics was the first fastener company in America to offer a full line of Combo’s! | Other sizes and quantities available by request | Tensile strength values for stainless screws are offered as approximations only; there is no single standard for the performance requirements of stainless machine screws.

  • Features

    • Steel Zinc Material
    • Round head with slotted Drive
    • 5/16-18 Diameter, 3" Length

Manufacturer Resources

Product Specs

Minimum Purchase:
100 units
Arra Compliant:
C
Buy American Compliant:
C
Division:
Electrical H1
Drive Type:
Slotted
Fastener Head Height:
0.198 - 0.216 in.
Fastener Head Type:
Round
Fastener Head Width:
0.557 - 0.59 in.
Fastener Length:
3
Field Application:
Electrical, Plumbing, Heating, 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-Round_Head_Machine_Screw.pdf
Order Minimum Imperial:
100
Order Minimum Uom Imperial:
CT
Pack Type:
Box
Product Group:
Fasteners
Product Height:
3.25 in
Product Length:
7.25 in
Product Weight:
6 lbs
Product Width:
6.75 in
Recess Penetration Gaging Depth:
0.144 - 0.170
Slot Depth:
0.099 - 0.132
Slot Width:
0.072 - 0.084
Sub Division:
Electrical-E H2
Tensile Strength:
60000 psi minimum
Thread Per Inch:
18
Department:
Electrical
Product Subgroup:
Screws
Product Type:
Machine Screw
Type2:
Machine Screw
Series:
RM
Product Finish:
Zinc
Product Details:
Machine Screw
Product Material:
Steel Zinc

Metallics RM129SLT – Frequently Asked Questions

1) What thread size and length is the Metallics RM129SLT machine screw?
It's a 5/16-18 machine screw, 3 inches long, with 18 threads per inch. That's the coarse (UNC) 5/16 thread, so it mates with a standard 5/16-18 nut or tapped hole. Head is round with a slotted drive.
2) Do I have to buy a full box, or can I order a few of these screws?
The RM129SLT ships by the box with a 100-count minimum, so the smallest order is 100 pieces. Metallics notes other sizes and quantities are available by request.
3) Can I use these screws on a federally funded or Buy American job?
The RM129SLT is flagged as both Buy American compliant and ARRA compliant in the manufacturer data, which is what procurement on publicly funded work usually asks for. Country of origin is listed as multiple, so if your spec requires a single documented origin, request that at the time of order.
4) Are these zinc machine screws okay outdoors or in a damp mechanical room?
The screw is carbon steel with a zinc finish, which is a mild corrosion barrier meant for dry or sheltered indoor use, panels, boxes, and equipment mounting. Sustained wet, washdown, coastal, or chemical exposure will eat through zinc plating; for that, go to a stainless machine screw in the same 5/16-18 x 3 in. size.
5) What strength are these Metallics round head screws rated to?
Minimum tensile strength is 60,000 psi, with a hardness of Rockwell B70 to B100, made from low-carbon steel in the AISI 1006 to 1022 range. That's standard low-carbon machine screw strength, fine for general equipment and enclosure mounting but not a substitute for a Grade 5 or Grade 8 bolt in a structural or high-load joint.
6) Where are 5/16-18 x 3 in. round head slotted machine screws typically used?
Metallics lists this as a fastener for the electrical, plumbing, heating, and air conditioning trades, the usual work being mounting equipment, brackets, straps, and devices through steel boxes, channel, and panels. The 3 in. length gives you enough reach for stacked material or a spacer plus nut; it's a through-bolt style screw, so you need a tapped hole or a 5/16-18 nut on the back side.
7) Will a Phillips or combo driver work on these, or do I need a flat blade?
Drive is slotted only, so it takes a flat-blade screwdriver. Metallics does make combination drive heads (they were the first US fastener company to offer a full combo line, back in 1985), but the RM129SLT is not one of them. If you want Phillips or combo drive in 5/16-18 x 3 in., ask for the combo version instead.
8) How much does a box of 100 of these weigh for shipping?
A 100-count box of the RM129SLT runs 6 lbs, with the carton measuring 7.25 x 6.75 x 3.25 in. Useful if you're palletizing a large fastener order or working to a weight allowance.
How fast can I get the Metallics RM129SLT 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 RM129SLT come with a warranty?
Absolutely. The Metallics RM129SLT 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 RM129SLT?
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 RM129SLT from ZenSupply?
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