SKU: 40902314932

Hillman 5/16 in. Diameter x 2-1/2 in. Length Grade 8 Heat-Treated Steel Hex Head Cap Screws, Coarse Thread, 100-Pack

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Description

Hillman 5/16 in. Diameter x 2-1/2 in. Length Grade 8 Heat-Treated Steel Hex Head Cap Screws, Coarse Thread, 100-PackHillman Grade 8 Hex Head Cap Screws, 5 16" x 2 1 2", 100 Pack Heavy duty Grade 8 hex head cap screws engineered from heat treated steel for high strength fastening. Coarse thread design with washer face under the head ensures secure seating and reliable performance in demanding applications. Key Features: Grade 8 Strength: Heat treated steel delivers superior tensile strength for heavy duty projects Coarse Thread: Provides fast, secure engagement in

Hillman Grade 8 Hex Head Cap Screws, 5/16" x 2-1/2", 100-Pack

Heavy-duty Grade 8 hex head cap screws engineered from heat-treated steel for high-strength fastening. Coarse-thread design with washer face under the head ensures secure seating and reliable performance in demanding applications.

Key Features:

  • Grade 8 Strength: Heat-treated steel delivers superior tensile strength for heavy-duty projects
  • Coarse Thread: Provides fast, secure engagement in tapped holes or with hex nuts
  • Washer Face Head: Built-in washer face under the hex head improves sealing and load distribution
  • Partially Threaded Shank: Ideal for alignment and shear strength in bolted joints
  • 100-Pack Convenience: Boxed quantity for jobsite efficiency and bulk stocking

Specifications Table:

Specification Details
Brand Name Hillman
Material Steel
Finish Heat-treated yellow dichromate
Grade 8 (USS Grade 8)
Head Type Hex head with washer face
Diameter 5/16 inch
Length 2-1/2 inch
Thread Type Coarse (USS)
Threading Partially threaded
Number in Package 100
Packaging Type Boxed

Frequently Asked Questions (FAQ):

Q: Are these fully threaded?
A: No. They are Grade 8 cap screws that are partially threaded along the shank.

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

Q: Can these be used outdoors?
A: They are heat-treated steel with a yellow dichromate finish for wear resistance; for corrosive outdoor environments, consider additional coatings or appropriate washers.

Q: What thread type do these have?
A: Coarse thread (USS).

Q: Do they include nuts or washers?
A: No. This pack includes only the hex head cap screws.

Industrial Strength with Sleek Utility

These Grade 8 hex cap screws bring a refined, utilitarian edge to any build, marrying strength with clean geometry. The washer-faced hex head offers a crisp silhouette while ensuring a flawless seat. Style them in exposed hardware applications for a subtle punch of industrial chic, or keep them concealed for uncompromising performance. A staple of luxurious, precision-crafted spaces.

Upgrade your fasteners to Grade 8 performance—add this 100-pack to your project and secure a stronger, longer-lasting 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: 40902314932

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4.4 ★★★★★
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Product Reviews
K
Verified Purchase
KatAC
West Palm Beach, US
★★★★★ 5
Best fix for flats that I've ever used
I have a large zero turn mower that is 10 years old and had a slow leak in the front tire. I tried fix a flat but even a full can would barely get any of the product into the tire and would end up oozing around the valve. After a long search, I found FlatOut. I was reluctant at first because it required removing the valve core, which I had never done. (I'm a 60+ year old female.) But the ratings were so high and the fact it was made with Kevlar, changed my mind. And I am so glad!! The instructions were so simple, core valve came right out (and the tool and new core valve is included), the tube that you pull from the bottle, fit snuggly on the valve stem yet was not difficult to put on. I elevated the bottle, added the amount I thought it needed, removed the tube, pushed it back in the bottle, replaced the cap, and then put the new valve stem back in. It only took a few minutes. And no mess! I had put on rubber gloves, expecting some to spill but it's a thick liquid and does not seep out anywhere it's not supposed to! I filled the tire with air and checked it each day for a week to make sure there was no leak before I used it. I then mowed some rough ground that is hilly and rocky and when I was done, the tire was perfect. I was so pleased I did the same thing to the other tire that never lost any air because I didn't want to wait for a leak. BUY THIS PRODUCT if you are tired of messing with slow leaks or flat tires! I will never use anything else. I purchased a package of core valves and taped them on the bottle so I'll have them when needed! I would give this product 10 stars if I could. It states on the bottle this product was used in the military, so it really has been tested. Thank you FlatOut for a product that actually does what it says!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 15, 2023
G
Verified Purchase
Gabriel
Belleville, US
★★★★★ 5
IT JUST WORKS!
Size: 1-Pack (32 oz), Size: 1-Pack (32 oz)
I recently found a piece of wire stuck in the side wall of my Zero Turn mower's rear tire. The tire has less than a full season of use, so I was looking for an alternative to "FIX" my sidewall puncture instead of removing it and patching or replacing. After looking up several different products, I decided to try Multi Seal. After reading the directions, I removed the valve tool that was included with the bottle. It was a little confusing, but the tool is basically a "stopper" for the clear hose that's in the bottle. Once I removed the valve from the stem, I connected the clear hose to the stem and proceeded to squeeze the product into the tire. I was surprised as to how easily it flowed into the tire. It was much easier than other tire sealants I've used. Although, its recommended to use half of the bottle in a rear tire, I used significantly more. I wanted to make sure the sealant would get to the sidewall. When I was finished adding the product, I replaced the valve in the stem and inflated the tire to the recommended pressure. It was at this time I pulled the wire from the tire. I started the mower and drove it for a few minutes. When i stopped, the product had started to escape the tire through the puncture. In fact, I had another unknown puncture that showed signs of the Multi Seal product. After a few minutes, air was still escaping from the punctures so I ended up driving the mower for about 10-15 minutes. This seemed to do the trick. Over a week later and 1.5 hours of operation later, the tire is still holding air pressure. This product is the BEST tire sealant I have ever used. I will be adding it to all my non-highway tires that I own.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2019
M
Verified Purchase
MasterTarl
Massapequa, US
★★★★★ 4
Works with effort
Size: 1-Gallon (128 oz)
I was skeptical about buying this. However, after installing the recommended ozs per tire, it seems to have fixed the two flats on my zero-turn lawnmower. I will continue to monitor the pressure, but it's held for four days at the time of this review. Caution. Even with a flat tire and no air, pumping the product into the tire builds backpressure, and the internal two-piece pump shaft blew apart on me; afterward, the hose connecting to the value stem blew off. In short, a lot of fluid was lost. Finally, the bottleneck of the pump collapsed when the bottle was only half empty. It's not as smooth an install as you are led to believe. It is a good concept, but the pump bottle is cheaply made and does not hold up well to deliver all the product to the tires. It fatigues after around 50 - 60 pumps, and you wind up struggling to get the job done.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 31, 2023
F
Verified Purchase
Frances
Lexington, US
★★★★★ 5
It did work
Size: 1-Pack (32 oz)
Sealed a small nail hole in a front tractor tire. Better than taking to shop for inside patch or making the 3x bigger for a rope patch.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
J
Verified Purchase
Jim
Alexandria, US
★★★★★ 5
Fixed a Bead Sealing Issue
Size: 1-Gallon (128 oz)
For traction in snow, I recently installed new "agricultural" style lugged front tires on a Simplicity garden tractor from around 1980. The tractor looks like it's survived a war, evidently having had a hard life as a workhorse owned by a school district. The front rims are rusty, and I naively thought the beads of these thick tires would seal properly anyway. They didn't. The jug of sealant ships with a valve core removal tool. Removing and reinstalling the cores is a piece of cake if you've never done it. I pumped a generous amount of the product into each tire and then did a few fast laps in a grassy paddock. It's a Kohler 19HP twin and it's a bit of a rocket. 😎 One tire sealed, the other didn't, and there was still a faint hiss. I added more product to that side and repeated the process. It seemed to hold. The next day that side was flat again, so I added more sealant and this time it held. Based on this experience, I'd say that instead of strictly following what the instructions recommended as an amount per tire, keep adding product in increments until the tire holds air. It's good stuff and it works. Will the tire self-heal if I puncture it? I don't know yet. It saved me the headache of having to remount these small tires or install tubes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026

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