SKU: 2107990905

Hillman 3/8 in. Dia x 4 in. L Heat-Treated Zinc Steel Hex Head Cap Screw (50-Pack)

Sale price$43.19 Regular price$47.99
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Description

Hillman 3/8 in. Dia x 4 in. L Heat-Treated Zinc Steel Hex Head Cap Screw (50-Pack)Hillman 3 8 in. x 4 in. Zinc Hex Head Cap Screws, 50 Pack Heavy duty Hillman hex head cap screws made of heat treated zinc plated steel for durable fastening. Sized 3 8 in. diameter by 4 in. length with coarse 3 8 16 machine threads, ideal for use with a nut or tapped hole in general construction and repair. Key Features: Durable Construction: Heat treated zinc plated steel resists wear and corrosion High Torque Capability: Hex cap head with machine

Hillman 3/8 in. x 4 in. Zinc Hex Head Cap Screws, 50-Pack

Heavy-duty Hillman hex head cap screws made of heat-treated zinc-plated steel for durable fastening. Sized 3/8 in. diameter by 4 in. length with coarse 3/8-16 machine threads, ideal for use with a nut or tapped hole in general construction and repair.


Key Features:

  • Durable Construction: Heat-treated zinc-plated steel resists wear and corrosion
  • High Torque Capability: Hex cap head with machine threads for strong clamping force
  • General Purpose Use: Grade 5 strength suits a wide range of projects
  • Coarse Thread: 3/8-16 thread for reliable hold in tapped holes or with nuts
  • Bulk Value: Convenient 50-pack for jobsite or shop replenishment

Specifications Table:

Specification Details
Diameter 3/8 in.
Length 4 in.
Thread Size 3/8-16
Thread Type Coarse
Head Type Hex Cap
Material Steel
Finish Zinc
Grade 5
Heat Treated Yes
Pack Quantity 50 count
Nuts Included No
Tightening Method Wrench or drill driver
Category Hex Bolt
Weight 27.26 lb
Package Dimensions 11 in L x 5.85 in W x 9.4 in H

Frequently Asked Questions (FAQ):

Q: Are nuts included?
A: No, nuts are not included and must be purchased separately.


Q: What wrench size is needed?
A: Tighten with a standard wrench or driver sized for a 3/8 in. hex cap screw head.


Q: What is the thread specification?
A: Coarse 3/8-16 machine threads.


Q: What grade are these bolts?
A: Grade 5 for balanced strength and workability.


Q: Where should these be used?
A: Suitable for general fastening into tapped holes or with matching nuts in construction, automotive, and maintenance applications.


Industrial Polish, Purposeful Strength

These zinc-kissed cap screws bring a subtle, silvery sheen that pairs beautifully with raw woods and painted steel. The crisp hex head reads precise and intentional—an elevated detail on open-shelf brackets or custom hardware. Style them with matte black fittings for contrast, or echo their finish with brushed nickel accents. A small component with big impact, they anchor designs with quiet, functional luxury.


Outfit your next project with reliable, Grade 5 strength—add this 50-pack 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: 2107990905

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Amber H.
Grantham, US
★★★★★ 5
Bought to hopefully seal bead leak
Size: 8oz MTB Tire Sealant Kit
I’ve been using Stan’s sealant on my tubeless tires for years! I have been having issues with a new tire for a while. It was like the bead wouldn’t seal on a specific spot and my tire was constantly leaking air. The local bike shop couldn’t fix it. I bought this product because it claimed to help seal bead leaks. So far so good! I really didn’t want all the doo-dads for the schrader valves. It took me a minute to figure out how to get the presta valve stem out but once I did- it was super easy to install the injector thing and add the sealant. After inflating my tires- I went for a 20 minute bike ride to get the sealant all around my tires. I’m going to take this bike out to pima-dynamite trailhead next weekend in Scottsdale AZ to see if the sealant holds up!!
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Reviewed in the United States on March 2, 2025
M
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Manuel J. Raposa
Omaha, US
★★★★★ 5
Works like a charm!
Size: 8oz MTB Tire Sealant Kit
I’ve used TireJect before. I used it on my golf scooter to eliminate a slow leak. They only hold 14 psi, but over 4 weeks it was down to 10. The TireJect fixed that immediately. Very easy to use.
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Reviewed in the United States on December 21, 2024
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Ryan
Louisville, US
★★★★★ 5
Good
Size: 8oz MTB Tire Sealant Kit
Excellent 
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Reviewed in the United States on June 27, 2025
U
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User
Waukegan, US
★★★★★ 5
This stuff is amazing
Size: 8oz MTB Tire Sealant Kit
I have tried several tire sealants available for my tubeless mountain bike tires. TireJect far out performed all of them. The sealant is holding up well and definitely seals up punctures quicker. I've been stranded miles from the trailhead before and never again with TireJect. Carrying your bike back to the car is a walk of shame nobody wants face. I also liked the included injector better than the others I've had and like that's it's part of a complete kit.
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Reviewed in the United States on May 2, 2023
E
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Eddie Johnson
Charlottesville, US
★★★★★ 5
Best bicycle tire sealant I’ve used! Top tier!
Size: 8oz MTB Tire Sealant Kit
I’ve used most of the known brands and Tireject rises to the top of the market!
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Reviewed in the United States on December 11, 2024

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