Product Description
- Also known as hex flange bolts, frame bolts or hex washer bolts.
- Flange under the head acts like a washer to increase the bearing surface and distribute the load.
- Serrated teeth under the head bite into the mating surface as tightened to prevent loosening.
- The heads of grade 5 steel fasteners are typically marked with 3 raised radial lines.
- Grade 5 steel fasteners have a minimum tensile strength of 105,000 pounds per square inch.
- Diameter (Nominal): 5/16"
- Thread Pitch: 18
- Diameter (Dimension): 0.3125"
- Length (Nominal): 5/8"
- Thread Length (Nominal): 0.625"
- Across Flats (Basic): 1/2"
- Across Flats (Minimum): 0.491"
- Across Flats (Maximum): 0.5"
- Head Height, Overall: 0.32"
- Flange Diameter: 0.706"
- Category: Flange Screws
- System of Measurement: Inch
- Brand: Aspen Fasteners
- Head Style: Hex Flange Head
- Head Style Detail: Locking Serrations
- Drive Style: External Hex Drive
- Thread Length: Full Thread
- Thread Direction: Right-Hand Thread
- Material: Steel
- Material Grade: Grade 5
- Material Processes: Quenched and Tempered
- Coating: Zinc Plated
- Coating Color: Clear
- Hardness Rating: Rockwell C25-C34
- Origin: Origin Undefined
Product Videos
Custom Field
Origin Origin Undefined
Hardness Rating Rockwell C25-C34
Length (Nominal) 5/8"
Across Flats (Maximum) 0.5"
Coating Zinc Plated
Material Grade Grade 5
cad_3d_viewer_url https||//3d.aspenfasteners.com/viewer/?cad_model=obj/BO028-51618X58
Material Steel
Order Machine Thread Fasteners
POS BO028-51618X58-001500
Thread Direction Right-Hand Thread
Diameter (Nominal) 5/16"
Flange Diameter 0.706"
Across Flats (Basic) 1/2"
Head Style Detail Locking Serrations
Head Height, Overall 0.32"
Brand Aspen Fasteners
Product Class Externally Threaded Fasteners
Thread Length Full Thread
System of Measurement Inch
Coating Color Clear
Category Flange Screws
Material Processes Quenched and Tempered
Across Flats (Minimum) 0.491"
Thread Pitch 18
Head Style Hex Flange Head
Thread Length (Nominal) 0.625"
Drive Style External Hex Drive
Diameter (Dimension) 0.3125"
