3 8 24 Carriage Bolts - Durable Zinc-Plated Heavy-Duty Fasteners (24-Pack)

(3 8 24 carriage bolt)

Technical Superiority That Beats Ordinary 3/8 Carriage Bolts

Our 3/8 x 9 carriage bolts feature:

• Grade 5 steel (150,000 PSI tensile strength)
• Hot-dip galvanized coating (5x rust resistance)
• Square neck design (94% slippage reduction)
• ±0.002" diameter tolerance

3.5 Inch Carriage Bolt Showdown: Value vs Premium

Custom Solutions for Your 3/8 Carriage Bolt Needs

Need 3/8-24 carriage bolts in odd lengths? Our CNC lathes deliver:

• 1/2" to 12" shank lengths
• Zinc-aluminum coatings
• Non-magnetic variants
• Same-day laser marking

Real-World Success: 3/8 x 24 Bolts in Action

Case Study: Midwest Bridge Co. reduced bolt replacement costs by 62% after switching to our 3/8-24 carriage bolts for steel decking. Their maintenance chief said: "We get 7+ years between replacements now."

Limited Stock: Get Your 3/8-24 Carriage Bolt Sample Kit

Free 10-piece kit includes 3/8 x 9 and 3.5" carriage bolts. Pay only $9.95 shipping.

98% customer satisfaction rate • ISO 9001 certified

Q: What is the diameter of a 3/8 x 24 carriage bolt?

A: A 3/8 x 24 carriage bolt has a 3/8-inch diameter and 24 threads per inch. This threading is ideal for heavy-duty applications requiring high torque resistance. Always confirm thread pitch compatibility with nuts or pre-tapped holes.

Q: How long is a 3/8 x 9 carriage bolt?

A: The "9" in 3/8 x 9 carriage bolt refers to the length in inches. This bolt is 9 inches long with a 3/8-inch diameter. Measure from under the square neck to the tip for accurate sizing.

Q: What are common uses for a 3.5-inch carriage bolt?

A: A 3.5-inch carriage bolt is often used in construction, furniture assembly, or automotive projects. Its square neck prevents rotation during installation. Choose stainless steel for outdoor or corrosive environments.

Q: Can a 3/8 carriage bolt fit a standard wrench size?

A: The square neck of a 3/8 carriage bolt typically fits a 9/16-inch wrench. Ensure the wrench size matches the neck dimensions to avoid stripping. Always use a backup wrench on the nut during tightening.

Q: Is a 3/8 x 24 carriage bolt interchangeable with a 3/8 x 9?

A: No—the "24" denotes threads per inch, while "9" refers to length. They serve different purposes: 24 TPI suits precision applications, whereas a 9-inch bolt is for extended reach. Verify both thread pitch and length before substitution.

Q: What material options exist for 3.5-inch carriage bolts?

A: Common materials include carbon steel (plain or zinc-plated) and stainless steel (304/316). Galvanized variants offer rust resistance for outdoor use. Select based on load requirements and environmental conditions.

Q: How to calculate the number of 3/8 carriage bolts needed for a project?

A: Divide the total load by the shear/tensile strength of a single 3/8 carriage bolt (check manufacturer specs). Add 10-15% extra for safety margins. For structural projects, consult engineering guidelines or a professional.