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Ships within 48 hours · Estimated delivery Aug 3 - Aug 8
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Description
Hillman 5/16 in. Diameter x 3-1/2 in. Length Heat-Treated Steel Hex Head Cap Screw, 50-PackHillman Grade 8 Hex Head Cap Screws, 5 16 in. x 3 1 2 in., 50 Pack Heavy duty Grade 8 hex head cap screws engineered from heat treated steel for high strength fastening. Ideal for machinery, automotive, and structural applications where a durable, partially threaded bolt is required. Key Features: Grade 8 Strength: Heat treated steel provides superior tensile strength for demanding applications Washer Face Head: Built in washer face under head helps
Hillman Grade 8 Hex Head Cap Screws, 5/16 in. x 3-1/2 in., 50-Pack
Heavy-duty Grade 8 hex head cap screws engineered from heat-treated steel for high-strength fastening. Ideal for machinery, automotive, and structural applications where a durable, partially threaded bolt is required.
Key Features:
- Grade 8 Strength: Heat-treated steel provides superior tensile strength for demanding applications
- Washer Face Head: Built-in washer face under head helps improve load distribution and sealing
- Partially Threaded Shank: Offers better shear strength and alignment in assemblies
- Coarse Thread: USS coarse thread for quick starts and strong hold in tapped holes or with nuts
- Bulk 50-Pack: Convenient boxed quantity for shop, jobsite, or maintenance stock
Specifications Table:
| Specification | Details |
|---|---|
| Diameter | 5/16 inch |
| Length | 3-1/2 inch |
| Material | Steel |
| Grade | Grade 8 |
| Finish | Heat-treated yellow dichromate-style |
| Thread Type | Coarse (USS) |
| Head Type | Hex head with washer face |
| Threading | Partially threaded shank |
| Number in Package | 50 pack |
| Packaging Type | Boxed |
| Unit of Measure Listed by Source | Metric (listing label) |
Frequently Asked Questions (FAQ):
Q: Are these fully or partially threaded?
A: They are partially threaded along the shank for added shear strength.
Q: What finish do these have?
A: They feature a heat-treated yellow dichromate-style finish for extra wear resistance.
Q: What thread type are they?
A: USS coarse thread.
Q: What tools are needed for installation?
A: Tighten with a wrench or compatible socket; a drill/driver with socket adapter may also be used.
Q: What size are these bolts?
A: 5/16-inch diameter by 3-1/2-inch length.
Industrial Strength With a Sleek, Purposeful Edge
These hex cap screws bring a crisp, engineered precision to any utilitarian vignette—think open-shelf workshops and garage studios. The faceted head and clean shank create a subtle rhythm that feels both rugged and refined. Style them with exposed hardware on custom shelving or welded frames to celebrate honest materials. Their performance pedigree makes them a quiet luxury in hardworking spaces.
Upgrade your hardware bin with Grade 8 strength—add this 50-pack to your cart for reliable, long-lasting fastening.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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