NAS6604D21 Drilled Shank Close Tolerance Bolt, 1/4-28, UNJF, 0.425 in L Thread, 3A

TECHNICAL INFORMATION

• FAA-STD Approved

SPECIFICATIONS

• Dash Number: 21
• Head Diameter: 0.429 to 0.439 in
• Head Height: 0.125 to 0.14 in
• Head Type: Hexagonal
• Thread Length: 0.425 in
• Thread Size: 1/4-28
• Thread Type: UNJF
• Grip Size: 1.312 in
• Thread Class: 3A
• Thread Direction: Right Hand
• Tensile Strength: 160000 psi
• Locking Mechanism: Non-Locking
• Diameter: 1/4 in
• Length: 1.737 in
• Grade: 4140
• Material: Alloy Steel
• Finish: Cadmium
• Suitable For Use With: Helicopter
• Domestic/Import: Domestic