SKU: 31244188240

Hillman 5/16-18 x 3-1/2 in Stainless Steel Hex Head Cap Screw, 50-Pack

Sale price$64.79 Regular price$71.99
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Description

Hillman 5/16-18 x 3-1/2 in Stainless Steel Hex Head Cap Screw, 50-PackStainless Steel Hex Head Cap Screw, 5 16 18 x 3 1 2, 50 Pack Durable 18 8 stainless steel hex head cap screws for high torque fastening in tapped holes or with nuts. Coarse, partially threaded shank with washer face under the head delivers a secure seal and corrosion resistance for indoor outdoor projects. Key Features: Corrosion Resistant Stainless Steel: 18 8 stainless steel for long lasting performance in outdoor and marine environments High Torque

Stainless Steel Hex Head Cap Screw, 5/16-18 x 3-1/2, 50-Pack

Durable 18-8 stainless steel hex head cap screws for high-torque fastening in tapped holes or with nuts. Coarse, partially threaded shank with washer face under the head delivers a secure seal and corrosion resistance for indoor/outdoor projects.


Key Features:

  • Corrosion-Resistant Stainless Steel: 18-8 stainless steel for long-lasting performance in outdoor and marine environments
  • High-Torque Hex Cap Head: Hex head with machine threads supports strong, reliable tightening with a wrench or drill
  • Washer Face Under Head: Built-in washer face helps create a better seal and distribute load
  • Partially Threaded (USS): Coarse threads with a solid shank for strength where shear resistance matters
  • Bulk 50-Pack: Convenient boxed pack for jobs requiring multiple fasteners

Specifications Table:

Specification Details
Brand Hillman
Type Hex head cap screw
Diameter / Thread Pitch 5/16-18
Length 3-1/2 inch
Material 18-8 Stainless Steel
Thread Type Coarse
Thread Coverage Partially threaded (USS)
Head Feature Washer face under head
Finish Stainless steel
Number in Package 50
Packaging Type Boxed
Installation Tighten with wrench or drill
Package Dimensions (HxWxL) 2 in x 3.5 in x 4.5 in
Package Weight 3.3 lb

Frequently Asked Questions (FAQ):

Q: Are these fully threaded?
A: No. They are USS partially threaded along the shank with coarse machine threads.


Q: What tools are recommended for installation?
A: Tighten with a wrench or a drill using an appropriate hex socket.


Q: Can these be used outdoors?
A: Yes. The 18-8 stainless steel offers enhanced corrosion resistance suitable for outdoor and damp environments.


Q: Do they have a built-in washer?
A: They feature a washer face under the head to improve sealing and load distribution.


Q: What size are these screws?
A: 5/16-18 thread diameter/pitch and 3-1/2 inch length.


Sleek, Industrial Fastening with Enduring Stainless Poise

These stainless hex cap screws bring a crisp, tailored precision to any build, marrying function with a polished industrial aesthetic. The subtle washer face and clean shank lines create a refined detail that elevates cabinetry, fixtures, and custom metalwork. Style them with brushed steel hardware and natural woods for a modern, textural contrast. A staple of luxurious craftsmanship, they deliver performance and poise in equal measure.


Upgrade your project with these corrosion-resistant stainless hex cap screws—order the 50-pack today for dependable, high-torque fastening.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 31244188240

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Clara
Whiting, US
★★★★★ 3
The shelves sag away from the wall overtime
Color: White, Number Of Shelves: 2, Size: 15.7in, Color: White, Number Of Shelves: 2, Size: 15.7in
Although the wood quality and finish of the shelf are clean and well-made, the main issue is that the shelves begin to sag over time while holding around 10 pounds, even though the product listing claims they can support up to 20 pounds. They may perform better on a brick wall, but on drywall you should be cautious. To fix the problem, I had to purchase floating shelf brackets for support, which solved the sagging issue. However, this defeats the purpose of the “floating” aesthetic. Since the shelf is in my bedroom, I can overlook it, but I personally wouldn’t install these in a common area if I wanted a clean floating look.
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Reviewed in the United States on May 27, 2026
M
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Mo
Boise, US
★★★★★ 5
Love this
Color: Rustic Brown, Number Of Shelves: 4, Size: 15.7in
Love these shelves so easy to put up so beautifully made and really enjoy the way they set on my wall very sturdy also!
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Reviewed in the United States on May 21, 2026
J
Verified Purchase
Jason
Chelsea, US
★★★★★ 5
Looks nice, easy to install
Color: Rustic Brown, Number Of Shelves: 2, Size: 22in
This shelf is lightweight, looks nice, and was easy to install. It comes with a little level to help you install it properly. There are plenty of mounting holes to choose from, so it is easy to screw it directly into a stud, or to just use holes that are convenient for you. It comes with a plethora of mounting hardware. I mounted mine a bit high up and chose to mount it upside down so that I wouldn't see the three screws that hold the shelf to the mounting bracket.
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Reviewed in the United States on April 8, 2026
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Verified Purchase
Valentin
Draper, US
★★★★★ 5
Floating shelves
Size: 30"W, 2P, Color: Black
Great product built to last. Package arrived on time and in great condition. Easy to install on wall. Light weight and well made.
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Reviewed in the United States on April 20, 2026
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nikki a.
Draper, US
★★★★★ 5
Modern and stylish shelves...very nice!!
Size: 30"W, 2P, Color: White
I got these floating shelves to go above matching dressers...very nice! I had a handman put them up, as I am not that handy with tools. Very impressive and modern!!
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Reviewed in the United States on April 6, 2026

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