Hillman 5/16 in. Diameter x 3-1/2 in. Length Heat-Treated Zinc Steel Hex Head Cap Screw, 50-Pack
SKU: 11419622405

Hillman 5/16 in. Diameter x 3-1/2 in. Length Heat-Treated Zinc Steel Hex Head Cap Screw, 50-Pack

$36.89 $40.99
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Description

Hillman 5/16 in. Diameter x 3-1/2 in. Length Heat-Treated Zinc Steel Hex Head Cap Screw, 50-PackHillman Grade 5 Zinc Hex Head Cap Screws, 5 16 in. x 3 1 2 in., 50 Pack These Grade 5 hex head cap screws from Hillman deliver reliable fastening strength for automotive, machinery, and general construction projects. Made of steel with a heat treated zinc finish, they resist wear while the washer faced head provides a better seal. Key Features: Grade 5 Strength: Heat treated steel provides higher tensile strength for demanding applications Corrosion

Hillman Grade 5 Zinc Hex Head Cap Screws, 5/16 in. x 3-1/2 in., 50-Pack

These Grade 5 hex head cap screws from Hillman deliver reliable fastening strength for automotive, machinery, and general construction projects. Made of steel with a heat-treated zinc finish, they resist wear while the washer-faced head provides a better seal.

Key Features:

  • Grade 5 Strength: Heat-treated steel provides higher tensile strength for demanding applications
  • Corrosion-Resistant Finish: Zinc plating helps protect against rust and wear
  • Washer-Faced Hex Head: Flat bearing surface under head improves sealing and load distribution
  • Partially Threaded Shank: Adds shear strength while allowing precise clamping
  • Coarse Thread Compatibility: Ideal for quick assembly and strong hold with standard nuts

Specifications Table:

Specification Details
Brand Hillman
Diameter 5/16 inch
Length 3-1/2 inch
Material Steel
Finish Heat-treated zinc
Grade Grade 5
Head Type Hex head with washer face
Thread Type Coarse
Threading Partially threaded along shank
Units Imperial
Pieces per Pack 50
Packaging Type Boxed

Frequently Asked Questions (FAQ):

Q: Are these fully threaded?
A: No. They are Grade 5 hex cap screws with a partially threaded shank.

Q: What size are these screws?
A: They are 5/16 inch diameter by 3-1/2 inch length.

Q: What material and finish?
A: Steel with a heat-treated zinc finish for added strength and wear resistance.

Q: What thread type do they use?
A: Coarse thread.

Q: How many are in the box?
A: 50 pieces per pack.

Industrial polish with purposeful strength

I love how these zinc-kissed hex cap screws bring a refined industrial note to projects—sleek, resilient, and unapologetically functional. The washer-faced head is a subtle design detail that reads clean while working hard behind the scenes. Style them with raw woods and matte black hardware for a balanced, tailored contrast. They’re the quiet essential that elevates craftsmanship to a luxe finish.

Choose these Hillman Grade 5 hex cap screws for dependable strength and a clean, corrosion-resistant finish on your next build.

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: 11419622405

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4.7 ★★★★★
Based on 1007 reviews
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Product Reviews
B
Verified Purchase
Becky Z.
Carnegie, US
★★★★★ 5
Love these shelves!
Size: 48inch, Color: Light Walnut
These are incredible for the price! Feel & look like wood. Easy-ish to install - just take your time, measure twice & use a level. Very sturdy! Great hardware & instructions. Now my daughter wants some for her apt.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 22, 2025
A
Verified Purchase
Amber Danielle Farmer-Sutherland
Alexandria, US
★★★★★ 5
Perfect!
Size: 24inch, Color: Walnut, Size: 24inch, Color: Walnut
Perfect! Just what I wanted. Sturdy, came with all the pieces, and very pretty wood.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 20, 2025
K
Verified Purchase
KB
Lexington, US
★★★★★ 3
They worked for replacing shelves but I wouldn’t mount them on my wall
Size: 24inch, Color: Walnut
I specifically bought these shelves because of their dimensions. I have a built-in cabinet and when we moved in 6 or so years ago, the previous owners must have taken them with them when they moved. It’s been bothering me the whole time I’ve lived here and wanted to make some but just never found the time to get around to it. I measured them out and these floating shelves were perfect for the dimensions I needed to replace the missing shelves. Would I put these on my wall(s)? Absolutely not unless I corrected the mounting issues. One thing that really stuck out to me was how bad the design was for mounting these shelves. When I took them out of the packaging, the brackets were falling out of the back everywhere. This did not inspire too much confidence that if I hung them up, they would be stable. I’ve had a ton of floating shelves similar to this mounting design, but the arms that the boards slide into on the wall for this particular shelving are thin and flat (while being easily mailable with your hand alone) in comparison to every other one I’ve had being round, or at least decently thick, sometimes with additional screws that you can insert under the board and into the mounting arms for extra stability. Also, any time I’ve ever had to mount a similar floating shelf, it took some finesse and strength to release the mounting arms from the back of the shelf because they fit very snugly. The fact that the mounting brackets were falling out of the back means that they are not snug and prone to be very loose. Another thing that stuck out to me is that the shelves are hollow. Now, for my purposes, this is fine, but again, detracts significantly from the confidence that these would be stable if mounted on the wall and would most likely droop when weight was applied. I also took issue with the fact the boards had no protective covering and were jammed into a box, with the hardware pressing against one of the boards tightly. I just flipped the shelf over to mask the defect from packaging but the side I wanted to use because it had better coloring was the damaged side. Mine did not come with any mounting directions but some common sense would be all you needed to put up something so simple. However, it did not come with a template to mark the wall for spacing, which adds to the difficulty because you have to have precise DIY measurements to slide the boards onto the mounting arms correctly. To be honest, if I were to mount these, I would bypass the shoddy mounting provided and go with some heavy, durable brackets underneath. Overall, these shelves worked for my purposes but I can see how the reviews would be very mixed in terms of mounting and quality. I did get these on a limited time deal and they were priced at approximately $8 per shelf, which was a really good deal to get 4 shelves for that price in comparison to the “normal” price resulting in approximately $11/shelf. I wouldn’t have paid full price for these and would have been highly disappointed had I with the intention to mount them, especially since I would have needed to provide better and more stable mounting hardware. They are lesser quality than others within the same price range and I think you could do much better if your intention is to mount them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 11, 2025
A
Verified Purchase
Amazon Customer
Bozeman, US
★★★★★ 5
Would purchase again
Size: 48inch, Color: Light Walnut
I was not sure what to expect when I purchased these. I thought maybe they were going to be a fake particle board. But this was a solid wood. Easy to install, no directions were in the box. There was a few chips in the corner of the wood but overall I would purchase again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 20, 2026
A
Verified Purchase
Amazon Customer
Dallas, US
★★★★★ 5
Love these and will be getting more. Very pretty.
Color: Oak, Size: 39.4"L x 8"D, Set of 2, Color: Oak, Size: 39.4"L x 8"D, Set of 2
Very nice shelves they look great up and were easy to install. Same color shown in picture. They seem very sturdy on the wall and I love the look of them. They are light weight and a good size just a little plunder 40 inches. Good quality for the price. I'll be buying again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 25, 2026

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