SKU: 31244188240

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

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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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Claudette J Dwyer
Los Angeles, US
★★★★★ 5
Well made shelves
Color: Dark Brown, Size: 15.7 inch
Cute and easy to attach to the wall.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 31, 2026
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Neal
Draper, US
★★★★★ 5
Must buy!
Color: Dark Brown, Size: 15.7 inch
Very nice and sturdy!
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Reviewed in the United States on May 7, 2026
C
Verified Purchase
Customer
Phoenix, US
★★★★★ 5
Amazing purchase, so happy with it
Color: 3. Weathered Grey, Color: 3. Weathered Grey
Amazing purchase, it’s so beautiful, I love it so much! Been working from home, and had to turn my kitchen table into a table/work desk hybrid. I was sick of all the clutter on it, so I got this shelf and it worked like a charm. It’s so pretty, great quality, and the PERFECT SIZE. I bolted it into the wall right above my table and it’s really sturdy. The materials and design are beautiful and very high quality (especially for the reasonable price- I could see home stores charging $100 for this, easy). My only complaint is that they didn’t drill pilot holes in the wood planks, so screwing in the metal side pieces was a little annoying... I don’t think it would be possible without at least an electric screwdriver (or drill). Other than that, installing it was fine and now I love it so much. I’m tempted to get more for the other rooms in my apartment- it’s really the perfect shelf. It’s super multi-functional for organization/storage and decor + very affordable for the superior quality and appearance.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 25, 2021
T
Verified Purchase
The Organic Millennial
Grantham, US
★★★★★ 5
Easy way to have homemade looking storage/display!
Color: 1. Carbonized Black, Color: 1. Carbonized Black
I wanted something that didn't look cookie cutter, like I bought it at Home Depot. This is very high quality and the perfect size for any small spot that you want to highlight. The quality is excellent. It has a real rustic vibe. I couldn’t wait to find it the perfect “home” in my apartment. It's sturdy enough to hold a bunch of big books without bowing and can just be wiped down. It was really easy to put up without much trouble. This shelf looks great! UPDATE: PICTURE OF FINISHED PROJECT! Adorable!
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Reviewed in the United States on April 8, 2018
M
Verified Purchase
Mariah
Chelsea, US
★★★★★ 5
Great for plants
Color: 1. Carbonized Black, Color: 1. Carbonized Black
I gave this a 4 on easy to install and sturdiness because I wasn’t able to actually drill it into the wall because of the way my apartment wall is, not this product, so I cannot speak much on those 2 fields. However, this has found a lovely home on top of my bedroom’s radiator and it works great for my plants! It stands up straight on it’s own and I only need to place it on the radiator and do not need to tie/drill it to something else to keep it standing up. Would recommend for someone looking for a cute shelf on a counter top as well.
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Reviewed in the United States on July 14, 2020

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