Product Summary

롱제 캐리지 볼트 (also known as Coach Bolts or Cup Head Square Neck Bolts) are manufactured according to DIN 603 그리고 ISO 8677 standards, widely used in timber construction, security fencing, play

equipment, and automotive bodybuilding. Featuring a smooth, domed head and a square neck underneath, these 롱제 캐리지 볼트 are designed to lock into wood or a square hole in metal, preventing the bolt

from turning while the nut is being tightened from the opposite side.

• ✔ Anti-Tamper Design: The smooth, rounded head has no drive (like a slot or hex), making it nearly impossible to loosen from the exterior side—ideal for security applications.

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• ✔ Self-Locking Square Neck: The square shoulder under the head "bites" into timber or fits perfectly into pre-punched square metal holes, allowing for one-sided installation.

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• ✔ Extra Large Head Options: 롱제 provides specialized Large Head DIN 603 variants that offer a greater bearing surface, preventing the bolt from pulling through soft woods or composite materials.

Key Features of 캐리지 볼트

• Aesthetic & Safe Finish – The low-profile mushroom head provides a clean look and reduces snagging hazards in public spaces like playgrounds or decks.

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• Superior Pull-Through Resistance – The wide head design distributes clamping force over a larger area, protecting the integrity of the wood.

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• High-Strength Materials – Available in Grade 4.8 and 8.8 Carbon Steel, as well as marine-grade 스테인리스 스틸.

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• Global Standard Compliance – Fully compatible with Metric (DIN/ISO) and Imperial (ASME) sizing for international export.

Technical Specifications

• Standards: DIN 603 / ISO 8677 / ASME B18.5 / BS 4933

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• Metric Size Range: M5 to M24

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• Inch Size Range: 1/4" to 1" (UNC / UNF)

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• Property Class: Grade 4.8, 8.8 / Stainless Steel A2 to A4

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• Neck Style: Square Neck (Standard) / Ribbed Neck (Custom)

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• Finish: Zinc Plated (Clear/Yellow), Hot-Dip Galvanized, Black Oxide, Plain

• Material & Mechanical Properties

• 재료	등급	Tensile Strength	Yield Strength	애플리케이션
  탄소강	4.8	420 MPa	340 MPa	General Woodworking
  탄소강	8.8	800 MPa	640 MPa	Structural / Machinery
  스테인리스 스틸	SS304 (A2)	$\ge 700$ MPa	$\ge 450$ MPa	Outdoor Decks / Furniture
  스테인리스 스틸	SS316 (A4)	$\ge 800$ MPa	$\ge 600$ MPa	Coastal / Marine Structures

• Dimensions & Global Size Conversion
• Technical Standard: Longze provides high-quality carriage bolts (Coach Bolts) manufactured to DIN 603 and ASME B18.5 standards. These bolts feature a smooth, rounded mushroom head and a square neck underneath that prevents the bolt from turning when the nut is tightened, making them ideal for wood-to-wood and wood-to-metal security applications.

• American Size (# Gauge/Inch)	Nearest Metric Size (M)	Head Diameter (dk) (mm/inch)	Square Neck Width (v) (mm/inch)	Head Height (k) (mm/inch)
  #10 - 24	M5	13.5 mm / 0.469"	5.0 mm / 0.199"	3.3 mm / 0.114"
  1/4" - 20	M6	16.5 mm / 0.594"	6.0 mm / 0.260"	3.8 mm / 0.145"
  5/16" - 18	M8	20.6 mm / 0.719"	8.0 mm / 0.324"	4.8 mm / 0.176"
  3/8" - 16	M10	24.6 mm / 0.844"	10.0 mm / 0.388"	5.3 mm / 0.208"
  1/2" - 13	M12	30.6 mm / 1.094"	12.0 mm / 0.518"	6.9 mm / 0.270"
  5/8" - 11	M16	38.8 mm / 1.344"	16.0 mm / 0.650"	8.9 mm / 0.344"
  3/4" - 10	엠20	46.8 mm / 1.594"	20.0 mm / 0.775"	11.0 mm / 0.406"

• Surface Treatment

• Coating	Process	Salt Spray	애플리케이션
  Zinc Plated	Electroplating	72 to 144h	Indoor Furniture / Shelving
  Hot-Dip Galvanized	Molten Zinc	500 to 800h	Outdoor Fencing / Infrastructure
  Black Oxide	Chemical	24 to 48h	Decorative Hardware / Interior
  Passivated	Chemical	1000+h	Food Industry / Marine