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): 1-3/8"
- 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
Material Grade Grade 8
cad_3d_viewer_url https||//3d.aspenfasteners.com/viewer/?cad_model=obj/BO020-51618X138
Drive Style External Hex Drive
Product Class Externally Threaded Fasteners
Point Chamfered Point
Thread Length (Nominal) 0.875"
cad_3d_file_url https||//3d.aspenfasteners.com/assets/obj/BO020-51618X138.zip
Coating Color Yellow
Diameter (Dimension) 0.3125"
System of Measurement Inch
Order Machine Thread Fasteners
Thread Pitch 18
Head Style Hex Head
POS BO020-51618X138-001000
Across Flats (Basic) 1/2"
Diameter (Nominal) 5/16"
Head Height, Overall (Minimum) 0.195"
Diameter (Minimum) 0.3065"
Origin Made in U.S.A.
Brand Aspen Fasteners
Coating Zinc Plated
Head Height, Overall 0.2031"
Category Cap Screws
Pitch UNC Coarse Thread
Length (Nominal) 1-3/8"
Head Style Detail Washer Face
Standards and Specifications ASME B18.2.1 and SAE J429
Across Flats (Maximum) 0.500"
Diameter (Maximum) 0.3125"
Thread Direction Right-Hand Thread
Head Height, Overall (Maximum) 0.211"
Head Markings Six radial lines 60 degrees apart and manufacturer ID
Across Flats (Minimum) 0.489"
Material Steel
