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1/4"-28 UNF ScrewDiameter: 0.250 inchesThreads per Inch: 28Thread Diameter: 6.350 mmPitch: 0.907 mm5/16"-24 UNF ScrewDiameter: 0.313 inchesThreads in step with Inch: 24Thread Diameter: 7.938 mmPitch: 1.058 mm3/8"-24 UNF ScrewDiameter: 0.375 inchesThreads in line with Inch: 24Thread Diameter: 9.525 mmPitch: 1.058 mm5/16"-18 UNF ScrewDiameter: 0.313 inchesThreads in line with Inch: 18Thread Diameter: 7.938 mmPitch: 1.411 mm