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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★★★★★ 4
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Reviewed in the United States on April 30, 2026
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★★★★★ 5
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Size: Large, Color: (001) Black / Black / White
I recently picked up a pair of Under Armour socks, and they’ve quickly become my go-to choice for daily wear and workouts. From the first wear, the fit felt snug and supportive without being too tight. The fabric is lightweight yet durable, and it does a great job wicking sweat — keeping my feet dry even during longer runs or intense gym sessions. One of the things I appreciate most is the arch support and cushioning in the right places. It adds just enough padding where I need it, especially under the ball and heel of the foot, which makes a noticeable difference on days when I’m on my feet a lot. The socks also have a nice breathable mesh pattern that improves airflow.
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Reviewed in the United States on January 4, 2026
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no body!
Natrona Heights, US
★★★★★ 5
Perfect fit
Size: Large, Color: (100) White / White / Black
Durable and comfortable. Size works well. Very soft with nice thickness for training. Fairly long lasting
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Reviewed in the United States on February 12, 2026
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Chelsea, US
★★★★★ 5
Post-COVID Sock Hunt: Finally a Win
Size: Medium, Color: (001) Black / Black / White
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