Steel Carriage Bolt, Grade 5, Zinc Plated Finish, Square Neck, Round Head, Meets ASME B18.5/SAE J429, 4" Length, Fully Threaded, 1/4"-20 UNC Threads (Pack of 50)

★★★★☆ 4.0 38 reviews

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Management number 218173758 Release Date 2026/05/03 List Price US$10.54 Model Number 218173758
Category

The grade 5 steel carriage bolt with zinc plated finish has a square neck and round head and meets American Society of Mechanical Engineers ASME B18.5 and Society of Automotive Engineers J429 specifications. Grade 5 steel, composed of quenched and tempered medium carbon steel, is often used in applications where strength is the primary concern. The zinc plating offers corrosion resistance and has a reflective appearance. The square neck prevents the bolt from turning once installed, even when a nut is tightened. The round head has a domed shape.Carriage bolts, also called round head square neck bolts, are square-necked threaded fasteners commonly used in wood fastening applications. The bolt’s square neck prevents it from turning once installed using a nut.

  • Grade 5 steel is often used in applications where strength is the primary concern
  • Zinc plating resists corrosion and has a reflective appearance
  • Square neck prevents the bolt from turning once installed, even when a nut is tightened
  • Round head has a domed shape
  • Meets ASME B18.5 and SAE J429 specifications
UPC 082893651446
Brand Small Parts
Color zinc
Model 492013
Size Name 1/4"-20
Unit Count 50.0 Count
Part Number B009YAOYV8
Thread Size 1/4"-20
Thread Type Unc
Drive System Square
Grade Rating Grade 5
Manufacturer Brighton Best
Thread Class 2A
Thread Style Right Hand
Fastener Size #10-12
Fastener Type Carriage Bolt
Item Hardness Grade 5
Material Type Alloy Steel
Exterior Finish Zinc
Item Dimensions 4 inches
Number Of Items 50
Thread Coverage Fully Threaded
Screw Head Style Round
Manufacturer Grade Grade 5

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