Hillman 3/8 in. Diameter x 2-1/4 in. Length Grade 8 Heat-Treated Steel Hex Head Cap Screw, 50-Pack
SKU: 15850947782

Hillman 3/8 in. Diameter x 2-1/4 in. Length Grade 8 Heat-Treated Steel Hex Head Cap Screw, 50-Pack

Sale price$35.09 Regular price$38.99
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Description

Hillman 3/8 in. Diameter x 2-1/4 in. Length Grade 8 Heat-Treated Steel Hex Head Cap Screw, 50-PackHillman Grade 8 Hex Head Cap Screws, 3 8" x 2 1 4", 50 Pack Heavy duty Grade 8 hex head cap screws engineered from heat treated steel for maximum strength. Ideal for securing machinery and structural assemblies, these partially threaded bolts feature a washer face for a better seal and reliable clamping. Key Features: Grade 8 Strength: Heat treated steel delivers high tensile strength for demanding applications Washer Face Head: Built in bearing

Hillman Grade 8 Hex Head Cap Screws, 3/8" x 2-1/4", 50-Pack

Heavy-duty Grade 8 hex head cap screws engineered from heat-treated steel for maximum strength. Ideal for securing machinery and structural assemblies, these partially threaded bolts feature a washer face for a better seal and reliable clamping.


Key Features:

  • Grade 8 Strength: Heat-treated steel delivers high tensile strength for demanding applications
  • Washer Face Head: Built-in bearing surface improves sealing and load distribution
  • Partially Threaded Shank: Enhanced shear strength and alignment in bolted joints
  • Coarse Thread: Reliable engagement for faster installation with nuts or tapped holes
  • Multipack Convenience: 50 boxed screws for shop, jobsite, or maintenance stock

Specifications Table:

Specification Details
Diameter 3/8 inch
Length 2-1/4 inch
Material Steel
Finish Heat Treated
Grade Grade 8
Head Style Hex head with washer face
Thread Type Coarse
Threading Partially threaded along shank
Number in Package 50 pack
Packaging Type Boxed
Category Hex Bolts

Frequently Asked Questions (FAQ):

Q: Are these fully threaded?
A: No. They are partially threaded along the shank to improve shear strength.


Q: What tools are needed for installation?
A: Tighten with a wrench or a drill/driver using the appropriate hex socket.


Q: Do these have a special finish?
A: Yes. They are heat-treated and noted with a yellow dichromate-style finish in some listings for added wear resistance.


Q: What thread type do they use?
A: Coarse thread suitable for use with matching nuts or tapped holes.


Q: Can these be used in structural or machinery applications?
A: Yes. Grade 8 heat-treated steel is appropriate for high-load mechanical assemblies when sized and torqued correctly.


Industrial Poise with Performance Precision

These hex cap screws bring a crisp, engineered silhouette to hardware moments, marrying strength with sleek utility. The faceted head and washer face create a refined, intentional detail in exposed fastener applications. Style them with blackened steel brackets or natural oak for a chic contrast. Essential, enduring, and unapologetically functional—hardware that elevates the build.


Stock your project with Grade 8 reliability—add this 50-pack of Hillman hex cap screws to your cart today.

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: 15850947782

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4.3 ★★★★★
Based on 1751 reviews
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Lynnette
Draper, US
★★★★★ 5
Not too thick and durable and sturdy.
Color: Rustic Brown, Size: 24"W x 6.7"D, 3 Pack
Just before I purchased these 3 I bought 2 sets of 2 larger ones. The color is exactly what I was needing. They are packaged together so no scratches or damage. My husband (the installer) says they are easy enough to install. They are perfect for a diy update, durable and hold plenty of weight for their size. Happy happy customer
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
J
Verified Purchase
Jose
Alexandria, US
★★★★★ 5
Good quality for the price
Color: Black, Size: 30"W x 6.7"D, 3 Pack, Color: Black, Size: 30"W x 6.7"D, 3 Pack
Seamless floating shelves that look and feel great. I opted to use different drywall anchors since I didn't trust the ones that came with the product. I have bad drywall and no studs where I was mounting so that doesn't fall back onto the product. The shelves are true to size and have held up great. The shelves themselves aren't too heavy so it leaves some room to add weight onto them. I used the 30in long shelf on the left and 24in long shelf on the right to create a nice corner shelf. There are additional screws on the bottom the keep the shelves from moving off the bracket.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 18, 2026
J
Verified Purchase
josseline m.
West Palm Beach, US
★★★★★ 3
Be careful
Color: Oak, Size: 24"W x 6.7"D, 3 Pack, Color: Oak, Size: 24"W x 6.7"D, 3 Pack
They are nice but flimsy, not flush on the wall scared they might fall
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2026
C
Verified Purchase
Chanel
Louisville, US
★★★★★ 4
Beautiful for decor, not great for anything with heft.
Color: Oak, Size: 24"W x 6.7"D, 3 Pack, Color: Oak, Size: 24"W x 6.7"D, 3 Pack
They are easy to install and exactly as pictured. I find them to be lovely and uniform, and they can't with proper instructions and even extra pieces. I took away a star because they are described as "heavy duty" use, but the dowels used to mount the shelves are flimsy. Mine are mounted on combo of studs and drywall, the plates are secure and not going anywhere. The problem is the dowels themselves that fit into the corresponding holes of the shelf: they bend easily. I put three books and bookends on one shelf and watched it tip down. I did attach the bottom screws into the dowels I secure the shelf to the mounting brackets, but that's not going to save any items from sliding off as it bends down over time. I pulled the books immediately and decided to use these for decor only rather than any practical use. The stock photo suggesting lining these shelves with glass jars filled with flour, rice, and lentils is a terrible idea.
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Reviewed in the United States on August 12, 2025
A
Verified Purchase
Amazon Customer
Waukegan, US
★★★★★ 5
Great Looking Shelves
Color: Oak, Size: 24"W x 6.7"D, 3 Pack
We love the floating shelves. They were easy to install and matched our island perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 27, 2026

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