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Steel Hex Bolt, Grade 5, Zinc Plated Finish, Flange Hex Head, External Hex Drive, Meets IFI 111/SAE J429, Flanged, Non-Serrated, 3/4" Length, Partially Threaded, 5/16"-18 UNC Threads, Imported (Pack of 50)

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Product Specifications
Brand Name
Small Parts
Part Number
Head Diameter
1/2  inches
Head Height
21/64  inches
Overall Length
3/4  inches
Size Name
Thread Size
Thread Coverage
Partially Threaded
Flange Diameter
0.68  inches
Flange Thickness
0.05  inches
Import Designation
Indentation Hardness
25  Rockwell C
Number of Items
Tensile Strength Max
120000  PSI
Thread Class
Thread Length
0.875  inches
Thread Style
Specification for this product family (See all  products)
Drive Style
External Hex
Flange Type
Material Type
Exterior Finish
Zinc Plated
Specification Met
IFI 111 , SAE J429
Manufacturer Grade
Grade 5
Head Style
Flange Hex
Thread Style
Right Hand
Special Features
System of Measurement

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Key Features

  • Grade 5 steel is often used in applications where strength is the primary concern
  • Zinc plating resists corrosion and has a reflective appearance
  • Flange hex head has a non-serrated flange for additional grip with the mating surface
  • Meets IFI 111 and SAE J429 specifications

Package Details

Shipping Weight: 1.6 pounds
Package Size: 5.3 x 3.6 x 1 inches

Product Description

The grade 5 steel hex bolt has a zinc plated finish, has a non-serrated flange hex head with an external hex drive, and meets Industrial Fasteners Institute IFI 111 and Society of Automotive Engineers SAE 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 material is magnetic. The zinc plating offers corrosion resistance and a reflective appearance. The flange hex head has six flat sides that wrenches can grip to turn from the side, enabling use when there is no space above the head for a screwdriver. The non-serrated flange acts like a washer to increase the fastener's bearing surface and distribute the clamping force over a larger area, providing grip and reducing damage to mating surfaces.

Cap screws and hex bolts are threaded fasteners with thick hex-shaped heads that can be used with threaded nuts or in areas with limited clearance above the tapped (threaded) hole. Cap screws have slightly different dimensions than hex bolts and have a washer face underneath their unflanged hex head to act as a large bearing surface against the mating material.

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