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Five chrome-plated Grade 5 carriage bolts with round heads and square necks

Zoro Select

Zoro Select MPB751 Carriage Bolt 5/16-18 x 1 1/2 in Pack of 5

SKU CH-N4Q4-93VYV

Chrome-plated Grade 5 carriage bolts, 5/16-18 by 1 1/2 inches, pack of five

  • Product typeBolts
  • Grade 5 steel rated at 120,000 psi tensile strength
  • Chrome-plated finish resists corrosion in outdoor use
  • Square neck locks into wood to prevent bolt spin
  • ASME B18.5 compliant dimensions ensure reliable fit
  • Pack of five carriage bolts for multiple fastening jobs

Zoro Select Grade 5 Carriage Bolts

These bolts are medium carbon steel fasteners with a chrome plated finish and a square neck design. They meet ASME B18.5 standards and come in a pack of five. The coarse UNC threading and round head profile suit general purpose fastening tasks.

Builders needing Grade 5 strength in a 5/16-18 size

The 120000 psi tensile strength handles structural shear loads where Grade 2 hardware would be insufficient. Projects requiring stainless corrosion resistance or a different thread pitch should select alternative fasteners.

1 1/2 inch length with 5/16 inch diameter

The 0.688 inch head diameter and 0.156 inch square height provide standard clearance for Grade 2 nuts. The 21/64 inch drill size guides pilot hole preparation. Longer grip lengths or higher grade requirements exceed this package.

How it compares

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

Price $8.99
Cheaper than about 85% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameZORO SELECT
Product typeBolts

Questions about this item

What size drill bit is needed for the 5/16-18 threads?

The specified drill size is 21/64 in to match the 5/16-18 UNC thread specification.

Will these Grade 5 bolts work with the Grade 2 nuts I already have?

Yes, the manufacturer highlights confirm they are for use with Grade 2 nuts.

How can I verify the square neck dimensions after installation?

Measure the square width at 0.307 in and square height at 0.156 in to match the stated specs.

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