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Cup Square Bolts – Twinthumb Fasteners

Cup Square Bolts

Carriage bolts featuring a smooth domed head and square neck for secure fastening into timber and other materials.

Cup Square Bolts

Cup Square Bolts

Cup square bolts, commonly known as carriage bolts, are fasteners featuring a smooth, rounded domed head and a square neck directly beneath the head. The square section locks into timber or other suitable materials during installation, preventing the bolt from turning while the nut is tightened.

Sizes

M5x12 to 125mm
M6x12 to 125mm
M8x12 to 125mm
M10x16 to 125mm

Material

• Mild Steel
• Stainless Steel
• 15B36

Finishing

Zinc Yellow-Zinc Black Olive Drab

Custom sizes available on request. Contact us for special dimensions, materials, or finishes.

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Need a Custom Size?

Contact us for custom sizes, special materials, or unique finishes.

Request a Quote