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Clearance hole chart for inch bolts and screws. Drill size and hole diameter for normal, close and loose fit classes are tabulated.
This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. There is also a printable version that has both metric and inch threads.
Use this chart to find out what clearance hole size to use for your imperial screws and bolts. A handy PDF is also available to download.
Use our bolt size chart and full guide to learn how to easily look up bolt hole sizes and ensure correct dimensions for your home and building projects.
Check out the clearance hole size chart for metric and imperial bolts, screws, and studs according to ASME B18.2.8 standard.
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.
The chart below displays a variety of common screw sizes and their clearance hole recommendations. The table provides two different class of fits, Close Fit and Free Fit.
METRIC CLEARANCE HOLE CHART. Metric clearance hole chart for metric bolts and screws according to ASME B18.2.8. M2 Clearance Hole : Close fit: 2.2 mm, Normal fit: 2.4 mm , Loose fit: 2.6 mm. M3 Clearance Hole : Close fit: 3.2 mm, Normal fit: 3.4 mm , Loose fit: 3.6 mm. M4 Clearance Hole : Close fit: 4.3 mm, Normal fit: 4.5 mm , Loose fit: 4.8 mm
The hole sizes for inch fasteners are patterned after USA common usage and the general clearances translated from the metric standard.
Use the table below to determine the clearance hole size for imperial bolts and screws. How to read the chart – a 1/4″ bolt with a close fit would have an F (0.257) clearance hole. Metric clearance hole chart. A clearance hole is a hole drilled through a part to allow a bolt to pass through.