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Use the below bolt hole clearance chart for Metric size bolts and screws. This table shows how to determine the clearance hole size for a bolt. For example, an M3 bolt with a medium fit would have a 3.4 mm clearance hole. Nominal Thread Diameter/mm Clearance Hole Sizes/mm Close Fit Series Medium Fit Series Free Fit Series 1.6 1.7 1.8 2.0 2.0 2.2 2.4 2.6 2.5 2.7 2.9 3.1 3.0 3.2 3.4 3.6 4.0 4.3 4.5 4.8 5.0 5.3 5.5 5.8 6.0 6.4 6.6 7.0 7.0 7.4 7.6 8.0 8.0 8.4 9.0 10.0 10.0 10.5 11.0 12.0 12.0 13.0 14.0 15.0 14.0 15.0 16.0 17.0 16.0 17.0 18.0 19.0 18.0 19.0 20.0 21.0 20.0 21.0 22.0 24.0 22.0 23.0 24.0 26.0 24.0 25.0 26.0 28.0 27.0 28.0 30.0 32.0 Nominal Thread Diameter/mm Clearance Hole Sizes/mm Close Fit Series Medium Fit Series Free Fit Series 30.0 31.0 33.0 35.0 33.0 34.0 36.0 38.0 36.0 37.0 39.0 42.0 39.0 40.0 42.0 45.0 42.0 43.0 45.0 48.0 45.0 46.0 48.0 52.0 48.0 50.0 52.0 56.0 52.0 54.0 56.0 62.0 56.0 58.0 62.0 66.0 60.0 62.0 66.0 70.0 64.0 66.0 70.0 74.0 68.0 70.0 74.0 78.0 72.0 74.0 78.0 82.0 76.0 78.0 82.0 86.0 80.0 82.0 86.0 91.0 85.0 87.0 91.0 96.0 90.0 93.0 96.0 101.0 Nominal Thread Diameter/mm Clearance Hole Sizes/mm Close Fit Series Medium Fit Series Free Fit Series 95.0 98.0 101.0 107.0 100.0 104.0 107.0 112.0 105.0 109.0 112.0 117.0 110.0 114.0 117.0 122.0 115.0 119.0 122.0 127.0 120.0 124.0 127.0 132.0 125.0 129.0 132.0 137.0 130.0 134.0 137.0 144.0 140.0 144.0 147.0 155.0 150.0 155.0 158.0 165.0Download the Metric Clearance Hole Chart to save the chart as a PDF – useful to print out to have next to your tools. Want to determine what size clearance hole for Imperial, for example, 3/8″, then check out our chart here. Reference: Oberg, E., Jones ,F.D., Horton H.L., Ryffel H.H., (1976). Machinery’s Handbook聽20th Edition.聽 Industrial Press Inc, 1446-7. |
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