ROUND HEAD SQUARE NECK BOLT / SCREW (CARRIAGE BOLT)

Description

Round Head Square Neck Bolt / Screw (Carriage Bolt) Manufacturer & Supplier – MKM Fasteners

MKM Fasteners presents the Round Head Square Neck Bolt, also widely known as the Carriage Bolt, a high-strength, corrosion-resistant fastener ideal for wood-to-metal or metal-to-metal applications. This bolt features a smooth, domed round head and a square neck beneath it that locks into place during tightening, preventing rotation and ensuring a firm and secure hold.

Engineered in compliance with DIN 603 and ANSI B18.5 dimensional standards, and tested to ISO 3506-1 and ASTM F 593 mechanical standards, this bolt guarantees superior performance and durability. The square neck design enhances grip and provides a tamper-resistant solution when used with one-sided access points.

Available in both metric and inch sizes, the Carriage Bolt from MKM Fasteners delivers exceptional tensile strength:

• A2-70: Min 700 Mpa (SS 304 / SS 304L)

• A2-80: Min 800 Mpa

• A4-70: Min 700 Mpa (SS 316 / SS 316L)

• A4-80: Min 800 Mpa
  In inches, A2 and A4 grades deliver a minimum tensile strength of 95 ksi and 80 ksi respectively, offering robust performance across different applications.

Key Specifications:

• Thread Type: Metric & Inch

• Dimensional Standards: DIN 603 / ANSI B18.5

• Mechanical Standards: ISO 3506-1 / ASTM F 593

• Tensile Strength:

  • Metric: Min 700–800 Mpa

  • Inch: Min 80–95 ksi

• Material Options:

  • SS 304 / SS 304L (A2)

  • SS 316 / SS 316L (A4)

• Size Range: M6–M12 & 1/4″–1/2″

The Carriage Bolt by MKM Fasteners is ideal for structural, furniture, marine, and general construction use—offering strength, security, and corrosion resistance where it’s needed most.

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