5/16"-18 Aluminum Hex Cap Screws

5/16"-18 Aluminum Hex Cap Screws

Lightweight Aluminum Hex Head Bolts | 5/16" Diameter - 18 Threads per Inch


  • Size: 5/16"-18
  • Hexagon head designed to be driven by a wrench or socket
  • Also called hex cap bolts, hex bolts, tap bolts or hex cap screws
  • Lightweight 2024-T4 Aluminum Alloy
  • High strength-to-weight ratio
  • Commonly used in the automotive and aerospace industries
  • Resistant to atmospheric corrosion

Hex Cap Screws feature a hexagonal head designed to be driven with a wrench or socket, and are commonly used with nuts and washers as a fastener assembly.

Important: We recommend not mixing metals; aluminum fasteners should be used with aluminum fasteners. For more information, please read our article on the subject HERE.

A Hex Bolt is measured as: Diameter x Thread Pitch x Length from Under Head
*Aluminum Hex Cap Screws are Fully Threaded Regardless of Length. A fully threaded hex cap screw can also be called a tap bolt.

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Product Specifications
Across Flats (Width)
1/2" (Max 0.500 - Min 0.489)
Body Diameter
5/16" (Max 0.3113 - Min 0.3026)
Color
Silver
Diameter
5/16"
Drive Style
External Hex
FT = Full Thread
Yes
Head Height
13/16"
Head Style
Hex
Material
Aluminum
Product Type
Hex Cap Screw
Standards Met
ASME B18.2.1
System of Measurement (Unit)
Inch
Thread Direction
Right Hand
Thread Length Max
5/16" Diameter Hex Cap Screws 1-1/2" in length and up will have a shoulder (partial thread)
Thread Pitch (Count)
18 Per Inch
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
Width Across Corners
0.577
Wrench Size
1/2"