Aircraft Machine Screw Length: 5/16", Thread: 4-40

• NSN 5305-00-957-2383
• Thread Class: 2a
• Thread Direction: Right-hand
• Thread Length: 0.182 Inches Minimum And 0.263 Inches Maximum
• Fastener Length: 0.281 Inches Minimum And 0.312 Inches Maximum
• Head Style: Flat Countersunk
• Head Diameter: 0.191 Inches Minimum And 0.225 Inches Maximum
• Internal Drive Style: Cross Recess Type Ii
• Nominal Thread Diameter: 0.112 Inches
• Thread Quantity Per Inch: 40
• Minimum Tensile Strength: 60000 Pounds Per Square Inch
• Countersink Angle: 99.0 Degrees Minimum And 101.0 Degrees Maximum
• Screw Material: Steel Comp 1010
• Screw Material Document And Classification: 66 Fed Std Single Material Response
• Screw Surface Treatment: Cadmium And Chromate
• Screw Surface Treatment Document And Classification: Qq-p-416,type 2,class 3 Fed Spec Single Treatment Response
• Thread Series Designator: Unc
• Nondefinitive Spec/std Data: 3 Type And 3c Style