Metallics RM146SLT 5/16-18 x 4...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.86
Metallics RM146SLT 5/16-18 x 4 in. Round Head Slotted Machine Screws - Steel Zinc - 100qty

Metallics RM146SLT 5/16-18 x 4 in. Round Head Slotted Machine Screws - Steel Zinc - Each

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Model: RM146SLT
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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 4 in. Round Head Slotted Machine Screws - Steel Zinc - 100qty

  • Features

    • 5/16-18 Diameter, 4" Length
    • Steel Zinc Material
    • Round head with slotted Drive

  • 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.

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:
4
Field Application:
Electrical, Plumbing, Heating and 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:
7.15 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
Thread Type:
UNC
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 RM146SLT – Frequently Asked Questions

1) Will a 5/16-18 machine screw thread into a standard 5/16 UNC tapped hole or nut?
Yes. The Metallics RM146SLT is a 5/16-18 UNC thread, 18 threads per inch, so it mates with any standard coarse-thread 5/16 nut, strut nut, or tapped 5/16-18 hole. It is a machine screw, so it needs an existing tapped hole or a nut, not a pilot hole in wood or sheet metal.
2) How strong are these 5/16-18 steel machine screws?
Minimum tensile strength is 60,000 psi, with hardness Rockwell B70 to B100, made from AISI 1006 to 1022 low carbon steel. That is standard low carbon machine screw material, fine for mounting boxes, panels, fixtures and brackets. It is not a graded structural bolt, so for a load-bearing structural connection specify a Grade 5 or Grade 8 hex bolt instead.
3) Do these Metallics machine screws meet Buy American and ARRA requirements for a public project?
Metallics lists the RM146SLT as both Buy American compliant and ARRA compliant, which is what a government, education or healthcare procurement file usually needs on a fastener line item. Country of origin is listed as multiple, so if your spec requires a single named origin on the submittal, confirm the origin on the lot you receive.
4) Can I drive these slotted machine screws with a power driver, or is it hand tools only?
Drive is a single slot, 0.072 to 0.084 in. wide and 0.099 to 0.132 in. deep. A slot gives the bit no self-centering, so a flat blade in a hand screwdriver is the practical way to run them. If you want to drive 100 screws on a power tool, pick a Phillips or combo head version instead.
5) Are zinc plated machine screws OK outdoors or in a wet location?
The finish is zinc plating over steel, which is a mild indoor corrosion coating. It handles dry interior electrical and mechanical work, but in wet, damp, coastal or chemically aggressive locations zinc will eventually rust through. For those openings specify a stainless machine screw in the same 5/16-18 x 4 size.
6) How many 5/16-18 x 4 in. screws come in a box of Metallics RM146SLT?
They ship as a 100 count box, and 100 is the order minimum, so one purchase gets you the full box rather than a single screw. Box weight is listed at 7.15 lbs.
7) Does the RM146SLT come with nuts or washers?
No. The RM146SLT box is screws only, 100 of the 5/16-18 x 4 in. round head slotted screws. Order 5/16-18 hex nuts and any flat or lock washers separately, or thread them into an existing 5/16-18 tapped hole.
8) What trades actually use a 4 inch long round head machine screw like this?
Metallics targets the RM146SLT at electrical, plumbing, heating and air conditioning work. The 4 inch length is for through-bolting where a short screw will not reach: deep box and enclosure mounting, standoff brackets, strut and channel assemblies, and equipment hangers where the screw passes a spacer or insulation before picking up a nut.
How fast can I get the Metallics RM146SLT 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 RM146SLT come with a warranty?
Absolutely. The Metallics RM146SLT 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 RM146SLT?
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 RM146SLT from ZenSupply?
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