Carriage Bolts – Manufacturer, Supplier & Exporter from India

Company Overview

Founded in 2009, Dipti Metal Industries, Mumbai, is an ISO 9001:2015 certified Carriage Bolts manufacturer, Carriage Bolts supplier, and Carriage Bolts exporter of Carriage Bolts (Coach Bolts). We supply premium-quality bolts globally, serving industries such as construction, furniture, infrastructure, marine, and petrochemicals across Europe, Middle East, Americas, Asia-Pacific, Africa, and Australia.

---

What Are Carriage Bolts?

Carriage Bolts (Coach Bolts) are round head bolts with a square or ribbed neck beneath the head, preventing rotation during tightening. They are widely used for wood-to-wood and wood-to-metal applications, providing a tamper-proof, smooth finish.

---

Available Carriage Bolts Standards & Grades

Carriage Bolts International Standards

• DIN: DIN 603 – Round Head Square Neck Bolts

• ISO: ISO 8677 – Carriage Bolts (metric)

• UNI: UNI 5737 – Round Head Square Neck Bolts

• ASME/ANSI: B18.5 – Round Head Square Neck Bolts

Carbon Steel Carriage Bolts Grades

• ISO 898-1 Mechanical Grades: 4.6 Carriage Bolts, 4.8 Carriage Bolts, 5.6 Carriage Bolts, 5.8 Carriage Bolts, 6.8 Carriage Bolts, 8.8 Carriage Bolts, 10.9 Carriage Bolts, 12.9 Carriage Bolts

• ASTM/ASME Equivalents:

  • Grade 2 Carriage Bolts – Low carbon steel, general purpose

  • Grade 5 Carriage Bolts – Medium carbon steel, quenched & tempered (~8.8 ISO equivalent)

  • Grade 8 Carriage Bolts – Alloy steel, quenched & tempered (~10.9 ISO equivalent)

Stainless Steel Carriage Bolts Grades

• AISI / ASTM: 304 Carriage Bolts, 304L Carriage Bolts, 316 Carriage Bolts, 316L Carriage Bolts, 321 Carriage Bolts, 347 Carriage Bolts

• ISO / DIN Equivalents:

  • A2-70 Carriage Bolts (≈ 304 SS, DIN 1.4301)

  • A2-80 Carriage Bolts (≈ 304 SS high strength)

  • A4-70 Carriage Bolts (≈ 316 SS, DIN 1.4401 / 1.4404)

  • A4-80 Carriage Bolts (≈ 316 SS high strength)

Alloy Steel Carriage Bolts Grades

• ASTM A193 B7, B16 (for high-temperature service)

• Equivalent to ISO 10.9 & 12.9 mechanical classes

Brass / Copper Alloys Carriage Bolts

• IS 319 Brass, CZ121, CZ122

• UNI 5705, DIN CW614N / CW617N

Special Alloys Carriage Bolts (Optional for Custom Orders)

• Duplex Stainless Carriage Bolts  (UNS S31803 / S32205, WNR 1.4462)

• Super Duplex Carriage Bolts (UNS S32750 / S32760)

• Nickel Alloys Carriage Bolts : Inconel, Monel, Hastelloy, Alloy 20

---

Carriage Bolts Size & Range

• Diameter: M5 to M64 (Metric) / ¼″ to 2½″ (Inch Series)

• Lengths: 10 mm to 500 mm

• Threads: Metric (Coarse/Fine), UNC, UNF, BSW, BSF

---

Carriage Bolts Surface Finishes

• Black Oxide Carriage Bolts

• Zinc Plated (Clear / Blue / Yellow) Carriage Bolts

• Hot Dip Galvanized Carriage Bolts

• Nickel / Chrome Plated Carriage Bolts

• Geomet / DACROMET Coating Carriage Bolts

• Plain / Self-color Carriage Bolts

---

Carriage Bolts Applications

• Wooden structures & decking

• Furniture & architectural hardware

• Heavy equipment & infrastructure fastening

• Petrochemical & marine applications (SS & duplex grades)

• Outdoor construction projects (galvanized bolts)

---

Carriage Bolts Export & Global Supply

• Supply Markets: Europe, Middle East, Africa, Asia-Pacific, Americas

• Ports of Loading: Nhava Sheva, Mundra, Kandla, Cochin, Vizag, Chennai

• Certifications: ISO 9001:2015, EN 10204 3.1/3.2 MTC, SGS / TÜV / BV approvals

• Packaging: Cartons, wooden pallets, export-standard seaworthy packing

---

Why Choose Dipti Metal Industries?

• Full range of Carriage Bolts in Carbon Steel, Stainless Steel, Alloy Steel & Brass

• Compliance with DIN, ISO, UNI, ASTM/ASME standards

• Large inventory for bulk exports with competitive pricing

• Trusted supplier across construction, marine, petrochemical, and power sectors