Iso 2768 Hole Tolerance Chart M4
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.
In this system of tolerances and fits, the lower deviation of the hole is always equal to zero. Shaft basis system The desired clearances and interferences in the fit are achieved by combinations of various hole tolerance zones with the shaft tolerance zone 'h'. In this system of tolerances and fits, the upper deviation of the hole is always.
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.
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Grade NOMINAL HOLE SIZES (mm) over 3 6 10 18 30 40 50 65 80 100 120 140 160 180 200 225 250 280 315 355 inc.