- 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.
DIMENSIONAL ATTRIBUTES- Diameter (Nominal): 5/16"
- Thread Pitch: 18
- Diameter (Dimension): 0.3125"
- Diameter (Minimum): 0.3065"
- Diameter (Maximum): 0.3125"
- Length (Nominal): 4-1/2"
- 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"
PRODUCT ATTRIBUTES- 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 UPC Code:
698435019119
- Coating:
- Zinc Plated
- Across Flats (Maximum):
- 0.500"
- specifications_document_url:
- https://www.aspenfasteners.com/content/2D_PDF/product80/BO020-51618X412.PDF
- Category:
- Cap Screws
- Head Style Detail:
- Washer Face
- Standards and Specifications:
- ASME B18.2.1 and SAE J429
- Material:
- Steel
- Brand:
- Aspen Fasteners
- Across Flats (Minimum):
- 0.489"
- Shop by Material:
- Steel
- Head Style:
- Hex Head
- Coating Color:
- Yellow
- cad_3d_viewer_url:
- https://3d.aspenfasteners.com/viewer/?cad_model=obj/BO020-51618X412
- Thread Length (Nominal):
- 0.875"
- Material Grade:
- Grade 8
- Length (Nominal):
- 4-1/2"
- Thread Pitch:
- 18
- Head Height, Overall (Minimum):
- 0.195"
- Diameter (Maximum):
- 0.3125"
- cad_3d_file_url:
- https://3d.aspenfasteners.com/assets/obj/BO020-51618X412.zip
- System of Measurement:
- Inch
- Thread Direction:
- Right-Hand Thread
- Drive Style:
- External Hex Drive
- Pitch:
- UNC Coarse Thread
- Head Height, Overall:
- 0.2031"
- Head Markings:
- Six radial lines 60 degrees apart and manufacturer ID
- Diameter (Minimum):
- 0.3065"
- Across Flats (Basic):
- 1/2"
- Head Height, Overall (Maximum):
- 0.211"
- Shop by System of Measurement:
- Inch
- Product Class:
- Externally Threaded Fasteners
- Origin:
- Made in U.S.A.
- Diameter (Dimension):
- 0.3125"
- Diameter (Nominal):
- 5/16"
- Point:
- Chamfered Point
- Order:
- Machine Thread Fasteners
- POS:
- BO020-51618X412-000300
