PRIME-LINE
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Prime-Line Carriage Bolts, 5/16 Inch-18 By 6 Inch, A307 Grade A Zinc Plated Steel, 25 Pack
Why you'll like it
- Smooth Safety Finish — Domed round head leaves no exposed sharp edges when fully fastened for a clean, professional look.
- Secure Anti-Spin Design — Integrated square shoulder locks into material to prevent the bolt from turning while tightening.
- Corrosion Resistant — Crafted from A307 Grade A carbon steel with a protective zinc plating for basic rust defense.
- Versatile Application — Excellent choice for wooden docks, playground equipment, timber framing, and heavy-duty carpentry.
Product details
Description
Upgrade your heavy-duty woodworking, playground construction, and outdoor framing projects with reliable fasteners designed for professional results. These carriage bolts feature a smooth, domed round head that eliminates sharp exposed edges once fully tightened, ensuring a clean and safe finish on visible installations.
Beneath the head lies a self-locking square shoulder that securely bites into wood or pre-drilled square holes, preventing the bolt from spinning during installation and allowing for easy one-sided tightening with a wrench or ratchet. Constructed from durable A307 Grade A carbon steel with a protective zinc-plated finish, these fasteners offer dependable resistance against rust and everyday wear in various environments.
Ideal for securing timber beams, building wooden docks, assembling playsets, or tackling general structural applications requiring a snag-free profile. Supplied in a convenient 25-pack to keep your workshop stocked for larger projects.
How to use
- Drill a hole matching the bolt diameter through the materials to be fastened.
- Insert the carriage bolt through the hole, ensuring the square shoulder under the head sinks securely into the wood or square mounting slot.
- Place a matching washer and nut onto the threaded end and tighten firmly using a wrench.
Ingredients
A307 Grade A Carbon Steel, Zinc Plating
As printed by the brand. Check the pack label if you have an allergy.
Specifications
| Brand | PRIME-LINE |
|---|---|
| UPC | 049793111807 |
| Ships from | USA (sourced directly), checked in Navi Mumbai |
| Sold by | Dropy.in |
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View allFAQs
What does grade A307 mean for a bolt?
ASTM A307 Grade A specifies carbon steel bolts and studs with a minimum tensile strength of 60,000 psi, commonly used for general-purpose structural and mechanical applications.
What are the dimensions of a 5/16 carriage bolt?
A 5/16 carriage bolt features a nominal shaft diameter of 5/16 inch with 18 coarse threads per inch, paired with a specific length measured from beneath the head to the tip.
Are nuts and washers included in this pack?
No, nuts and washers are not included in this package. You should ensure that any separately purchased nuts and washers match the 5/16-inch diameter specification.
Are these Prime-Line carriage bolts authentic USA imports?
Yes, these are authentic USA-imported items sourced directly by Dropy to ensure genuine manufacturing quality for your projects in India.
What can these carriage bolts be used for?
They are widely used for fastening wooden boards, playground structures, outdoor wooden docks, and any application that requires a smooth, non-snagging exposed bolt head.
How long will delivery take?
Most orders arrive in 15–20 days: we source each product directly from the USA, check it at our Navi Mumbai warehouse and pack it on video. Items marked Dropy Express ship from our India warehouse and arrive in 3–5 days.
Is cash on delivery available?
Full cash on delivery is available all over India on Dropy Express items. For other orders from ₹2,499 to ₹15,000 you can use Partial COD: pay 25% online now and the rest in cash on delivery.
Are your products genuine?
Yes. Every product is 100% authentic, sourced directly from the USA, quality-checked and packed on video at our Navi Mumbai warehouse.
What if my order arrives damaged or wrong?
Write to us at [email protected] as soon as it arrives. Damaged, wrong or not as described, our Buyer Protection gives you a full refund. The details are in our Return, Refund & Cancellation Policy.
Is delivery free?
Delivery is free on orders from ₹1,499. Below that a ₹79 delivery fee applies.