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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.
Clearance hole calculator to find the recommended clearance hole sizes from #0 through 1.5 in for inch bolts, screws and studs in three classes of clearance using close-, normal- and loose-fit category.
The standard covers the recommended clearance hole sizes for #0 through 1.5 in and M1.6 through M100 metric fasteners in three classes of clearing using a close, normal, and loose-fit category. Below, you can find some values taken from the ASME standard.
A clearance hole is necessary to permit a fastener to pass through a material without its threads gripping into it, what size should a clearance hole be for different fasteners such as a M4 screw or a 3/8 bolt. To determine its diameter, check out the clearance hole size chart for metric and imperial bolts, screws, and studs according to ASME ...
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.
Deciding on the appropriate clearance hole size depends on the scope of the project. For example, a looser fit simplifies the assembly process, while a closer fit allows for tighter tolerances. Clearance hole size charts are available for both metric and imperial bolts and screws.
Clearance Holes. Clearance holes provide a clear area around the screw, with no holding power, allowing the screw to simply slip through. They are used for the part that the screw is fastening to, and for the shank (unthreaded) portion of the screw.
The hole sizes for inch fasteners are patterned after USA common usage and the general clearances translated from the metric standard.