Clearance Holes For Inch Fasteners

"Clearance holes for inch fasteners" calculator was developed to calculate the recommended clearance hole sizes from #0 through 1.5 in for bolts, screws and studs in three classes of clearance using close-, normal- and loose-fit category. The recommended inch drill bit size for each class of clearance hole is shown in calculation results. The calculator also shows nearest substitute metric drill bit size for inch fasteners.

This calculator was developed by using the charts which are given in the ASME B18.2.8-1999 - " Clearance holes for bolts, screws and studs" standard.



Calculator:

INPUT PARAMETERS
Nominal Screw Size
Fit Class

 


Clearance Hole
RESULTS
Parameter Value Unit
Nominal Screw Size --- in
Fit Class --- --
Nominal Inch Drill Size --- in
Nearest Metric Drill Size --- mm
Minimum Hole Diameter --- in
Maximum Hole Diameter ---



Definitions:

Clearance hole: A hole on a part where threaded section of a bolt can pass.

Drill bit: A cutting tool used in drilling machines to drill a hole.

Reference:

  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc.
  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2012) . Machinery's Handbook . 29th edition.  Industrial Press Inc.
  • ASME B18.2.8-1999, Clearance holes for bolts, screws and studs