Left 'C' button clears the selected Hole tolerance - Right 'C' button clears the selected Shaft tolerance; Calculated Hole dimension - Displays the resulting dimensions of the basic size with the selected Hole tolerance applied - If the Hole class was selected from an inappropriate table.

ISO Symbol Description Hole Basis Shaft Basis Clearance Fits H11/c11 C11/h11 Loose running fit for wide commercial tolerances or allowances on external members. H9/d9 D9/h9 Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.

H8/f7 F8/h7 Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures. H7/g6 G7/h6 Sliding fit not intended to run freely, but to move and turn freely and locate accurately.

H7/h6 H7/h6 Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled. Transition Fits H7/k6 K7/h6 Locational transition fit for accurate location, a compromise between clearance and interference. H7/n6 N7/h6 Locational transition fit for more accurate location where greater interference is permissible. Interference Fits H7/p6 P7/h6 Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.

H7/s6 S7/h6 Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron. H7/u6 U7/h6 Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical. Preferred fits table (ANSI B4.2-1978) Basic Hole Tolerance classes for shafts Clearance Fits Transition Fits Interference Fits H6 g5 h5 js5 k5 m5 n5 p5 H7 f6 g6 h6 js6 k6 m6 n6 p6 r6 s6 t6 u6 x6 H8 e7 f7 h7 js7 k7 m7 s7 u7 d8 e8 f8 h8 H9 d8 e8 f8 h8 H10 b9 c9 d9 e9 h9 H11 b11 c11 d10 h10 Preferable fits of the hole-basis system (ISO 286-1:2010). Basic Shaft Tolerance classes for holes Clearance Fits Transition Fits Interference Fits h5 G6 H6 JS6 K6 M6 N6 P6 h6 F7 G7 H7 JS7 K7 M7 N7 P7 R7 S7 T7 U7 X7 h7 E8 F8 H8 h8 D9 E9 F9 H9 h9 E8 F8 H8 D9 E9 F9 H9 B11 C10 D10 H10 Preferable fits of the shaft-basis system (ISO 286-1:2010) Note: For economic reasons, the first choice for a fit should, whenever possible, be made from the tolerance classes shown with green color. Supplements: Link Usage Designed to calculate the limits, fits and tolerances according to ISO 286(2010) and ANSI B4.2 (1978) standards.

Reference: • Oberg, E., Jones,F.D., Horton H.L., Ryffel H.H., (2016). 30th edition. Industrial Press Inc. • Oberg, E., Jones,F.D., Horton H.L., Ryffel H.H., (2012). 29th edition. Industrial Press Inc.

• IS0 286-1 (2010) Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits • IS0 286-2 (2010) Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts • ANSI/ASME B4.2 (1978) Preferred Metric Limits and Fits.

Tolerances and fits This book includes tables and calculations for easy option of fits of machine parts and determination of their dimensional tolerances and deviations. Rg mechanics need for speed most wanted crack. Using this tool the following tasks can be solved: • Selection of suitable fits of machine parts according to the international standard ISO 286. • Determination of dimensional tolerances and deviations of machine parts according to the international standard ISO 286. • Selection of preferred fits of machine parts and determination of their dimensional tolerances and deviations according to ANSI B4.1.

• Determination of non-prescribed limit deviations of linear and angular dimensions according to ISO 2768.• Automatic design of a fit for the given clearance or fit interference respectively. The data, procedures, algorithms and specialized literature and standards ANSI, ISO, DIN and others were used in the calculations. List of standards: ANSI B4.1, ANSI B4.2, ISO 286, ISO 1829, ISO 2768, EN 20286, JIS B 0401. Information on the syntax and control of the calculation can be found in the document '. It is necessary that the dimensions, shape and mutual position of surfaces of individual parts of mechanical engineering products are kept within a certain accuracy to achieve their correct and reliable functioning.