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Five chrome carriage bolts with round heads and square necks

Zoro Select

Zoro Select MPB749 Carriage Bolt Chrome 1/4-20x2 1/2 Pk5

SKU CH-0A8P-X1GWF

Grade 5 carriage bolts with chrome-plated finish, 1/4-20 thread and 2-1/2 inch length in a five-piece pack

  • TypeBolts
  • Grade 5 strength rated at 120,000 psi tensile
  • Chrome plating resists corrosion on steel bolts
  • Square neck locks into wood to prevent spin
  • ASME B18.5 compliant for consistent dimensions
  • Pack of five simplifies project planning

Carriage bolts for wood-to-metal fastening

Zoro Select MPB749 carriage bolts join timber to metal where a smooth, rounded head is required. The square neck locks into the wood so the bolt will not spin while the nut is tightened. Chrome plating adds corrosion resistance for outdoor or damp environments. Each pack contains five Grade 5 fasteners.

Coarse UNC thread limits fine adjustment

The 1/4-20 UNC coarse thread advances quickly but offers less precise clamping force than a fine thread. Square neck dimensions of 0.245 in width by 0.125 in height require a matching square hole; the bolt will not seat in a round clearance hole. ASME B 18.5 compliance confirms dimensional tolerances for general-purpose use.

Grade 5 strength handles typical structural loads

Tensile strength of 120,000 psi supports common framing, decking and trailer repairs. The 2 1/2 in length spans two-by lumber plus a steel plate with room for a washer and nut. Not suited for high-vibration machinery joints that demand prevailing-torque nuts or for applications requiring Grade 8 or stainless corrosion performance.

Highlights

  • Grade 5 strength rated at 120,000 psi tensile
  • Chrome plating resists corrosion on steel bolts
  • Square neck locks into wood to prevent spin
  • ASME B18.5 compliant for consistent dimensions
  • Pack of five simplifies project planning

Specifications

BrandZORO SELECT
TypeBolts

Questions about this item

How do I know this pack of five is the right size for my project?

Each bolt measures 1/4 in. diameter with 20 threads per inch and 2 1/2 in. length, matching the MPB749 spec exactly.

What does the 120,000 psi tensile strength mean when I tighten these bolts?

The Grade 5 rating and 120,000 psi tensile strength indicate they handle high clamping loads without stretching, suitable for structural joints.

Will the 1/4-20 UNC coarse threads work with standard nuts and tapped holes?

Yes, the UNC coarse thread fits any 1/4-20 nut or tapped hole; use a 17/64 in. drill for clearance holes.

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