5/16"-18 Aluminum Hex Cap Screws
Lightweight Aluminum Hex Head Bolts | 5/16" Diameter - 18 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: 5/16"-18
- 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
**5/16"-18 Hex Cap Screws listed as PT, usually have a threaded portion of about 7/8".
However, this can vary slightly from manufacturer to manufacturer.
Product Specifications
Across Flats (Width)
1/2", Max 0.50 - Min 0.489
Body Diameter
5/16" (Max 0.3113 - Min 0.3026)
Color
Silver
Diameter
5/16"
Drive Style
External Hex
Head Height
13/16"
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
5/16" Diameter Hex Cap Screws 1-1/2" in length and up will have a shoulder (partial thread)
Thread Pitch (Count)
18
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual product measurements may vary slightly +/- within IFI Tolerances
Width Across Corners
0.577
Wrench Size
1/2"
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