1/4"-20 Aluminum Hex Cap Screws

1/4"-20 Aluminum Hex Cap Screws

Lightweight Aluminum Hex Head Bolts | 1/4" Diameter - 20 Threads per Inch


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. Hex cap screws in longer lengths feature an unthreaded shoulder beneath the head of the bolt.

  • Size: 1/4"-20
  • Hexagon head designed to be driven by a wrench or socket
  • Often referred to as Hex Cap Screws or Hex Bolts
  • Lightweight 2024-T4 Aluminum Alloy
  • High strength-to-weight ratio
  • Commonly used in the automotive and aerospace industries
  • Resistant to atmospheric corrosion

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.

Listed As: Diameter - Thread Pitch x Length from Under Head
FT: Fully Threaded
PT: Partially Threaded

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Product Specifications
Across Flats (Width)
7/16", Max 0.437 - Min 0.428
Body Diameter
1/4" (Max 0.250 - Min 0.245)
Color
Silver
Diameter
1/4"
Drive Style
External Hex
Head Height
5/32"
Head Style
Hex
Material
2024-T4 Aluminum Alloy
Product Type
Hex Cap Screw
Standards Met
ASME B18.2.1
Thread Direction
Right Hand
Thread Length Max
1/4" Diameter Hex Cap Screws 1-1/4" in length and up will have a shoulder (partial thread)
Thread Pitch (Count)
20
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual product measurements may vary slightly +/- within IFI Tolerances
Width Across Corners
Max 0.505 - Min 0.488
Wrench Size
7/16"
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