Product Description
- Hex cap screws are manufactured to tighter tolerances as compared to hex bolts.
- The heads of grade 8 steel fasteners are typically marked with 6 raised radial lines.
- The washer face under the head provides a precision bearing surface.
- Grade 8 steel fasteners have a minimum tensile strength of 150,000 pounds per square inch.
- The chamfered point improves engagement with a nut or pre-tapped hole.
- Diameter (Nominal): 5/16"
- Thread Pitch: 18
- Diameter (Dimension): 0.3125"
- Diameter (Minimum): 0.3065"
- Diameter (Maximum): 0.3125"
- Length (Nominal): 6"
- Thread Length (Nominal): 0.875"
- Across Flats (Basic): 1/2"
- Across Flats (Minimum): 0.489"
- Across Flats (Maximum): 0.500"
- Head Height, Overall: 0.2031"
- Head Height, Overall (Minimum): 0.195"
- Head Height, Overall (Maximum): 0.211"
- Category: Cap Screws
- System of Measurement: Inch
- Brand: Aspen Fasteners
- Head Style: Hex Head
- Head Style Detail: Washer Face
- Head Markings: Six radial lines 60 degrees apart and manufacturer ID
- Drive Style: External Hex Drive
- Pitch: UNC Coarse Thread
- Thread Direction: Right-Hand Thread
- Point: Chamfered Point
- Material: Steel
- Material Grade: Grade 8
- Coating: Zinc Plated
- Coating Color: Yellow
- Origin: Made in U.S.A.
- Standards and Specifications: ASME B18.2.1 and SAE J429
Product Videos
Custom Field
Diameter (Minimum) 0.3065"
Product Class Externally Threaded Fasteners
Drive Style External Hex Drive
Thread Direction Right-Hand Thread
Thread Pitch 18
Head Height, Overall 0.2031"
Across Flats (Basic) 1/2"
System of Measurement Inch
Head Style Hex Head
Point Chamfered Point
Material Grade Grade 8
Thread Length (Nominal) 0.875"
Material Steel
Head Height, Overall (Minimum) 0.195"
Pitch UNC Coarse Thread
Across Flats (Maximum) 0.500"
Origin Made in U.S.A.
Diameter (Maximum) 0.3125"
Head Markings Six radial lines 60 degrees apart and manufacturer ID
Length (Nominal) 6"
Head Style Detail Washer Face
Brand Aspen Fasteners
POS BO020-51618X6-000250
Head Height, Overall (Maximum) 0.211"
Coating Zinc Plated
Diameter (Dimension) 0.3125"
Across Flats (Minimum) 0.489"
Category Cap Screws
cad_3d_viewer_url https||//3d.aspenfasteners.com/viewer/?cad_model=obj/BO020-51618X6
Diameter (Nominal) 5/16"
Order Machine Thread Fasteners
Coating Color Yellow
cad_3d_file_url https||//3d.aspenfasteners.com/assets/obj/BO020-51618X6.zip
Standards and Specifications ASME B18.2.1 and SAE J429
