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Zinc-plated steel carriage bolt with round head and square neck, M6 by 70 mm, pack of 100

Zoro Select

Zoro Select Carriage Bolt M6-1.00 70 mm Class 4.6 PK100

SKU CH-3VV3-9VRMC

Zinc-plated steel carriage bolts with square necks, M6 × 1.00 thread, 70 mm long, Class 4.6 strength, pack of 100

  • Product typeScrews & Bolts
  • Square neck prevents rotation during tightening
  • Class 4.6 steel rated to 58,000 psi tensile strength
  • Zinc-plated finish resists corrosion in outdoor use
  • DIN 603 dimensions ensure consistent fit
  • Pack of 100 covers large fastening jobs

Carriage Bolts M6 x 70 mm

These carriage bolts suit DIY and trade users who need a smooth round head with a square neck that locks into wood or metal without spinning. The pack contains 100 pieces so you can finish larger assemblies without reordering.

Replaces loose or mixed hardware

Swap out worn fasteners or upgrade from lower-grade bolts when a consistent Class 4.6 rating and zinc-plated finish are required for outdoor or structural work. The jump is worth it when you need a uniform pack that meets DIN 603 dimensions.

Simple installation with standard tools

Drive the square neck into a pre-drilled hole and tighten the nut; the neck prevents rotation while you work. The main issue occurs if the hole is oversized, allowing the neck to spin and the bolt to turn.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $23.99
Pricier than about 56% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameZORO SELECT
Product typeScrews & Bolts

Questions about this item

What size square hole do I need for the M6-1.00 carriage bolt's square neck?

The square neck measures 6.48 mm wide and 4.60 mm high, so drill a matching square hole to prevent the bolt from turning while tightening.

How do I install these Class 4.6 carriage bolts so the square neck seats properly?

Insert the bolt through the hole, tap the square neck into the square cut-out with a hammer until the round head sits flush, then tighten the nut — skipping the seating step lets the bolt spin.

When should I replace these zinc-plated Class 4.6 carriage bolts?

Replace any bolt that shows white or red corrosion on the zinc coating, has stretched threads, or has a rounded or damaged square neck that no longer locks in the hole.

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