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): 6-1/2"
- Thread Length (Nominal): 1.125"
- 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
Standards and Specifications ASME B18.2.1 and SAE J429
Category Cap Screws
Thread Direction Right-Hand Thread
Across Flats (Maximum) 0.500"
POS BO020-51618X612-000250
Across Flats (Minimum) 0.489"
Drive Style External Hex Drive
Material Steel
Head Height, Overall 0.2031"
Head Height, Overall (Maximum) 0.211"
Brand Aspen Fasteners
System of Measurement Inch
Pitch UNC Coarse Thread
Diameter (Minimum) 0.3065"
Material Grade Grade 8
Product Class Externally Threaded Fasteners
Order Machine Thread Fasteners
Head Height, Overall (Minimum) 0.195"
Diameter (Dimension) 0.3125"
Head Style Detail Washer Face
Head Markings Six radial lines 60 degrees apart and manufacturer ID
Coating Zinc Plated
Across Flats (Basic) 1/2"
Thread Length (Nominal) 1.125"
Thread Pitch 18
Coating Color Yellow
Length (Nominal) 6-1/2"
Diameter (Nominal) 5/16"
cad_3d_viewer_url https||//3d.aspenfasteners.com/viewer/?cad_model=obj/BO020-51618X612
Origin Made in U.S.A.
Head Style Hex Head
Diameter (Maximum) 0.3125"
Point Chamfered Point
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