Hillman 5/16 in. Diameter x 3-1/2 in. Length Heat-Treated Steel Hex Head Cap Screw, 50-Pack
Regular price $47.99Hillman 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.
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