Hillman 5/16 in. Diameter x 1 in. Length Grade 5 Heat-Treated Zinc Steel Hex Head Cap Screws, 100-Pack
Regular price $25.99Hillman Grade 5 Zinc Hex Head Cap Screws, 5/16 in. x 1 in., 100-Pack
These Hillman hex head cap screws deliver reliable fastening strength for automotive, machinery, and general construction projects. Made from grade 5 heat-treated steel with a zinc finish, they resist wear and corrosion while providing secure clamping with a washer face under the head.
Key Features:
- Durable Grade 5 Steel: Heat-treated for increased tensile strength and wear resistance
- Corrosion-Resistant Zinc Finish: Helps protect against rust in indoor and covered outdoor applications
- Hex Head with Washer Face: Provides better seating and load distribution for a tight, secure hold
- Partially Threaded Shank: Ideal for clamping and alignment in structural and machinery joints
- Convenient Bulk Pack: 100 screws sized 5/16 in. diameter x 1 in. length for high-volume jobs
Specifications Table:
| Specification | Details |
|---|---|
| Diameter | 5/16 inch |
| Length | 1 inch |
| Material | Steel |
| Finish | Heat Treated Zinc |
| Grade | Grade 5 |
| Head Style | Hex head with washer face |
| Thread Type | Coarse (USS) |
| Threading | Partially threaded shank |
| Number in Package | 100 pack |
| Packaging Type | Boxed |
| Tightening Method | Wrench or drill/driver |
| Unit of Measurement | Imperial (size listed in inches) |
Frequently Asked Questions (FAQ):
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: Are these fully or partially threaded?
A: They are partially threaded along the shank, typical of hex cap screws.
Q: What is the thread type?
A: Coarse thread (USS).
Q: Can these be used outdoors?
A: The zinc finish offers basic corrosion resistance; for harsh or wet environments, consider stainless or hot-dipped galvanized fasteners.
Q: What grade are these bolts?
A: Grade 5, suitable for medium-strength applications.
Quiet Strength, Clean Hardware Poetry
In any refined space, the details do the heavy lifting—these zinc-kissed cap screws bring a polished, utilitarian elegance. I love the crisp hex head with its subtle washer face, delivering both form and function. Style them with brushed steel brackets or matte-black hardware to create a nuanced contrast that feels intentional. Essential, dependable, and chic—this is the hardware that makes luxury look effortless.
Equip your next project with dependable strength—add this 100-pack of Hillman grade 5 hex head cap screws to your cart today.
All third party trademarks, including logos and icons, referenced on our website and product pages remain the property of their respective owners. Unless specifically identified as such, Arbor's use of third party trademarks does not indicate any relationship, affiliation, sponsorship, or endorsement between Arbor Home and the owners of these trademarks. Any references by Arbor Home to third party trademarks are to identify the corresponding third party goods.

