1/2″-20 X 3-1/4″ Hex Head Cap Screws Bolts, UNF Fine Thread, Grade 5 Steel, Zinc

Description

• Hex cap screws are manufactured to tighter tolerances as compared to hex bolts.
• The heads of grade 5 steel fasteners are typically marked with 3 raised radial lines.
• The washer face under the head provides a precision bearing surface.
• Grade 5 steel fasteners have a minimum tensile strength of 105,000 pounds per square inch.
• The chamfered point improves engagement with a nut or pre-tapped hole.
• In general, fine thread fasteners are about 10% stronger than coarse threads under static loading.

DIMENSIONAL ATTRIBUTES

• Diameter (Nominal): 1/2″
• Thread Pitch: 20
• Diameter (Dimension): 0.5″
• Diameter (Minimum): 0.493″
• Diameter (Maximum): 0.500″
• Length (Nominal): 3-1/4″
• Thread Length (Nominal): 1.25″
• Across Flats (Basic): 3/4″
• Across Flats (Minimum): 0.736″
• Across Flats (Maximum): 0.750″
• Head Height, Overall: 5/16″
• Head Height, Overall (Minimum): 0.302″
• Head Height, Overall (Maximum): 0.323″

PRODUCT ATTRIBUTES

• Category: Cap Screws
• System of Measurement: Inch
• Brand: Aspen Fasteners®
• Head Style: Hex Head
• Head Style Detail: Washer Face
• Head Markings: Three radial lines 120 degrees apart and manufacturer ID
• Drive Style: External Hex Drive
• Pitch: UNF Fine Thread
• Thread Direction: Right-Hand Thread
• Point: Chamfered Point
• Material: Steel
• Material Grade: Grade 5
• Coating: Zinc Plated
• Coating Color: Clear
• Standards and Specifications: ASME B18.2.1 and SAE J429