Hillman 5/16 in. Diameter x 5-1/2 in. Length Heat-Treated Zinc Steel Hex Head Cap Screw, 50-Pack
SKU: 28555173865

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

Sale price$53.99 Regular price$59.99
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Description

Hillman 5/16 in. Diameter x 5-1/2 in. Length Heat-Treated Zinc Steel Hex Head Cap Screw, 50-PackHillman Grade 5 Hex Head Cap Screws, 5 16 in. x 5 1 2 in., 50 Pack These Hillman Grade 5 hex head cap screws provide reliable fastening strength for automotive, machinery, and construction projects. Made of heat treated steel with a zinc finish, they feature a washer face under the head and coarse threads for secure assembly. Key Features: Grade 5 Strength: Heat treated steel provides higher tensile strength for demanding applications Corrosion

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

These Hillman Grade 5 hex head cap screws provide reliable fastening strength for automotive, machinery, and construction projects. Made of heat-treated steel with a zinc finish, they feature a washer face under the head and coarse threads for secure assembly.


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 Face Head: Integrated bearing surface under the hex head improves load distribution and sealing
  • Coarse Thread Design: Ideal for quick assembly and strong hold in tapped holes or with nuts
  • Bulk Contractor Pack: 50-pack for efficient stocking and project savings

Specifications Table:

Specification Details
Brand Hillman
Diameter 5/16 inch
Length 5-1/2 inch
Material Steel
Finish Heat-treated zinc
Grade 5 (USS)
Head Style Hex head with washer face
Thread Type Coarse
Threading Partially threaded along shank
Units Imperial
Number in Package 50 pack
Packaging Type Boxed
Package Dimensions (L x W x H) 6.8 in x 4.5 in x 3.3 in
Package Weight 6.8 lb

Frequently Asked Questions (FAQ):

Q: Are these fully or partially threaded?
A: They are partially threaded along the shank (Grade 5 USS style).


Q: What tools are needed for installation?
A: Tighten using a wrench or driver/socket sized for a 5/16 in. hex cap screw with the appropriate nut and washer.


Q: Can these be used outdoors?
A: The zinc finish offers basic corrosion resistance suitable for many indoor and some sheltered outdoor uses; for harsh environments, consider galvanized or stainless options.


Q: What thread type do these screws have?
A: They use coarse threads (USS).


Q: What is included in the package?
A: A boxed 50-pack of 5/16 in. diameter x 5-1/2 in. length hex head cap screws.


Industrial polish with steadfast purpose

Clean-lined and quietly authoritative, these hex cap screws bring a refined industrial cadence to custom builds. The zinc finish offers a subtle gleam, while the crisp washer-faced head delivers a tailored, architectural detail. Pair them with matte black hardware for a chic, mechanical contrast or let them punctuate raw woods for modern utility. A small but essential flourish, they anchor craftsmanship with effortless sophistication.


Stock up on Hillman Grade 5 hex cap screws today for strong, reliable fastening that keeps projects moving.

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: 28555173865

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Pupspicacious
Natrona Heights, US
★★★★★ 5
Good quality and great value
Size: 2 Count (Pack of 1)
Willow & Everett Salt and Pepper Grinder Set - Stainless Steel Manual Mills I bought this set because my smaller pepper grinder broke. This set is very similar in style, though larger. I really like it! The larger size is easier to handle and can store more pepper and salt inside it, meaning it needs less frequent refills. The adjustable grinder mechanisms work very well. The lids are easy to take on and off. The caddy is a little flimsy, but that wasn't why I bought the set. If you are swayed by the caddy, then you might be disappointed if it receives heavy use (like a family dinner table). But the mills and grinders themselves are good quality and a great bargain.
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Reviewed in the United States on November 30, 2024
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GraphicsGuy
Los Angeles, US
★★★★★ 3
Simplicity wins here
Size: 2 Count (Pack of 1), Size: 2 Count (Pack of 1)
These S/P grinders are simple but I love it. I've purchased several grinders over the years. Some powered, a set using levers to grind, other manual twisters — each with cute features — that all had flaws with filling ease or the powered versions just quit working. This set is so easy to fill, adjust, and use, look, and feel great in hand, and don't break the bank with gimmicks. This set is form and function at its best. UPDATE: So I purchased this set in Nov of 2024. As you can see, it was love. Of late, the grinders have become problematic…especially the salt grinder. The salt grinder got to where even adjust the grind size because it took all I could do to even get the adjustment screw cap to screw on. Salt was getting trapped so I disassembled the grinder cap and cleaned it over and over. With each use, the grinder got more loose. Tonight, it finally gave up. No. These grinders aren’t extremely expensive but, from the reviews and ratings, I’m highly surprised and disappointed.
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Reviewed in the United States on May 17, 2025
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Elangela castellanos
Waukegan, US
★★★★★ 5
Loved it!
Model: 2 Pack Salt and Pepper Grinder, Model: 2 Pack Salt and Pepper Grinder
I loved it! The grinders look very elegant and work perfectly. The size is great, they’re easy to use, and the grinding is smooth. They also feel sturdy and good quality. Definitely recommend!
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Reviewed in the United States on March 19, 2026
A
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Amazon Customer
Houston, US
★★★★★ 5
Nice grinders for the price
Model: 2 Pack Salt and Pepper Grinder
The grinders are working fine, though I have only used them for a couple of days. Their size is a little smaller than I would like for in kitchen cooking, but I got them knowing they will work better in a planned move with a smaller kitchen. Good size for a table. I'm happy with the clean, simple appearance and the quality so far. Just ordered a second set for white and mixed color peppercorns and will donate the sort of hodge podge assortment of grinders I currently use.
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Reviewed in the United States on January 22, 2026
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Agnes
Draper, US
★★★★★ 5
Love them
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Love those. Good quality material and work very nicely. I like that I could set the size of the ground salt and pepper by myself, this was very useful.
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Reviewed in the United States on May 7, 2026

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