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

Zoro Select

Zoro Select MPB747 Carriage Bolt Chrome 1/4-20 x 1-1/2 in Pack of 5

SKU CH-0WJ9-Z410W

Chrome-plated Grade 5 carriage bolts with square neck, 1/4-20 UNC thread, 1-1/2 in length, pack of 5

  • Product typeBolts
  • Grade 5 steel delivers 120 000 psi tensile strength
  • Chrome plating resists corrosion in outdoor use
  • Square neck locks into wood to prevent spinning
  • UNC coarse threads suit Grade 2 nuts
  • Pack of five covers small repair jobs

1/4-20 Chrome Carriage Bolts

These Grade 5 carriage bolts come in a pack of five with a 1/4-20 UNC thread and a 1-1/2 inch length. The chrome-plated medium carbon steel resists corrosion while providing a tensile strength of 120,000 psi. They are designed for applications requiring a smooth, rounded head finish. The square neck prevents rotation during tightening.

Square Neck and Grade 5 Fit

A 17/64 inch drill size prepares the hole for the 0.245 inch square neck width. The 0.125 inch square height seats into the material to lock the bolt against turning. The round head measures 0.563 inch in diameter and 0.125 inch in height. These dimensions conform to ASME B 18.5 standards for interchangeability. They require Grade 2 nuts for proper assembly.

Medium Carbon Steel Capacity

The 120,000 psi tensile strength handles structural shear and clamping loads in wood or metal connections. The chrome plating adds a layer of protection against rust in outdoor or automotive environments. The pack of five supplies enough fasteners for a typical bracket or hinge installation. Buyers needing longer grip lengths or larger diameters must select different hardware.

How it compares

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

Price $9.99
Cheaper than about 80% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameZORO SELECT
Product typeBolts

Questions about this item

What is the tensile strength limit of these Grade 5 carriage bolts?

The tensile strength is 120,000 psi, so the limit under sustained use is that rated strength before failure.

Do these chrome-plated steel bolts generate heat or noise during all-day fastening?

No, they are passive fasteners with no moving parts, so they produce no heat or noise when installed.

Which nuts and drill bit must I already own to use these 1/4-20 bolts?

You need Grade 2 nuts with 1/4-20 UNC threads and a 17/64 in drill bit for the clearance holes.

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