Search  for anything...

3/8-16 x 4 Inch Carriage Bolt Kit, 304 Stainless Steel (18-8) with Hex Nuts & Flat Washers - 6 Sets, Round Head Square Neck, Full Thread Coverage by Glvaner

Based on 798 reviews
Condition: New
Checking for the best price...
$9.98
Save $2.00 was $11.98

Buy Now, Pay Later


As low as $2 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Tuesday, Nov 3
Order within 22 hours and 58 minutes

Available payment plans shown during checkout

Protect Your Purchase

Easy claims online, fast replacements, no fees

Checking for protection plans...

At a glance

Condition
New
Size
3/8-16 x 4"
Number of Items
6
Model
GVNA36057-6
Color
Silver
Material
Stainless Steel
Thread Size
3/8"-16

Features 5

  • Ready to Use Save Time & Effort: This complete 6-piece set includes 6 precisely matched 3/8-16 x 4" Carriage Bolts, 6 Hex Nuts, and 6 Flat Washers; No more separate purchases or surprise missing partsget everything you need to start and finish your project efficiently
  • Engineered from Grade A2-70 304 (18-8) Stainless Steel, these fasteners deliver significantly greater corrosion resistance and strength compared to zinc-plated or lower-grade alternatives. Designed to perform reliably in both indoor and demanding outdoor environments
  • Precision Machining For a Smooth, Flawless Fit: Every bolt is manufactured to meet ANSI B18.5 standards, ensuring consistent quality, precise threads, and accurate dimensions. This ensures smooth installation, prevents cross-threading, and delivers a secure, reliable fit in every application
  • Full Thread Design & Locking Square Neck Unmatched Strength & Easy Installation: Featuring Full Thread Coverage from neck to tip for maximum nut engagement and superior strength. Moreover, the integrated square neck is designed to bite securely into wood, preventing the bolt from spinning during nut tighteningsaving you time and frustration. This robust combination ensures a vibration-resistant and permanently secure connection

Description

Your trusted source for premium bolts, screws, nuts & washers. Industrial quality for home and job site. Bulk orders welcome. GLVANER delivers industrial-grade fasteners for every application. Our products feature premium materials, precision threads, and corrosion-resistant finishes. From #4 wood screws to 3/4" heavy hex nuts, we stock all standard sizes for home and industry. Need bulk quantities or custom specs? Our team is ready to help. Trust GLVANER for consistent quality and fast support—because your project's strength matters to us Each bolt features consistent, burr-free threads for secure fastening. Grade A2-70 options ensure long-lasting performance Ideal for decks, fences, and construction. Our fasteners resist rust , maintaining structural integrity in harsh environments Whether you're a DIY enthusiast or a professional contractor, GLVANER screws drive smoothly and grip firmly. Our wide selection means you'll find the right fastener for wood, metal, or masonry. Save time and money by buying all your hardware in one place. If you need a size not listed, just ask—we specialize in bulk and custom orders. Experience the difference of quality fasteners on your next project Are these real 304 stainless steel? Yes. These are made of high-quality 304 (18-8) stainless steel, tested to resist rust and corrosion in outdoor and damp environments Does each set include nut and washer? Yes. Every set comes with a matched hex nut and flat washer, no additional parts needed Can these be used on wood? Yes. The round head distributes pressure and protects wood, ideal for decks, fences, and furniture. What is the square neck for? The square neck prevents the bolt from spinning when tightening the nut, making installation fast and easy. What tools do I need for installation? Just a wrench or socket to tighten the hex nut. No special tools required. Carriage Bolt Kit Carriage Bolt Kit Black Hex Bolt Kit Carriage Bolt by Metric Hex Lag Screws Kit Hex Bolt Kit Black Flange Hex Bolt

Specs 31

Material Stainless Steel
Thread Size 3/8"-16
Exterior Finish Stainless Steel
Manufacturer Grade Grade 304
Head Style Round
Screw Head Style Round
Color Silver
Fastener Type Carriage Bolt

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Nov 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


Handy bolt kit
Size: 1/4-20 x 1-3/4" Number of Items: 20
Received bolt kit very quickly. Kit was as described. Great value as compared to local product prices. I would definitely recommend.
Reviewed in the United States on October 10, 2026 by WVslugo

Perfect Replacements
Size: 5/16-18 x 5/8" Number of Items: 10
Perfect replacement carriage bolts and nuts for my Craftsman snowblower scraper plate, and competitively priced.
Reviewed in the United States on August 21, 2026 by John

Good deal
Size: 3/8-16 x 1-3/4" Number of Items: 8
Nice bolt kit worked great for the project I was doing
Reviewed in the United States on June 1, 2026 by Mark a Santucci jr

Very durable and excellent product, extreme rust resistant
Size: 1/2-13 x 2" Number of Items: 6
Excellent quality and superfast shipping
Reviewed in the United States on May 30, 2026 by USSMARSHAL

Stainless
Size: 1/4-20 x 4" Number of Items: 10
Well made
Reviewed in the United States on March 8, 2026 by Don Wadsworth

Worked well
Size: 1/4-20 x 1-1/2" Number of Items: 20
They worked well and did what they're supposed to do.
Reviewed in the United States on July 15, 2026 by Kenneth Nichols

Think they will be just fine for installing a ez lift kit on my utility trailer.
Size: 5/16-18 x 1" Number of Items: 10
Haven't used yet, but they seem to be high quality bolts. Going to use them to mount an ez lift kit on my utility trailer.
Reviewed in the United States on May 12, 2026 by Gary

Stainless carriage bolts
They worked out good . A little dull but polished right up
Reviewed in the United States on October 16, 2026 by Richard W Hallock
Checking for best price...