This Calculator will determine the preferred size and limit tolerances for Running or sliding to interference-locational fits per ANSI B 4.1. Related: NOTE: Maximum Nominal Size Input to Calulator is Ø19.69". More Related Resources: Link to this Webpage.

RC 4 Close running fits are intended chiefly for running fits on accurate machinery with moderate surface speeds and journal pressures, where accurate location and minimum play are desired. RC 5 and RC 6 Medium running fits are intended for higher running speeds, or heavy journal pressures, or both.

Loose running fits exposed to effects of corrosion, contamination by dust and thermal or mechanical deformations. All limits shown in chart below are in thousandths of an inches. Symbols H5,g5, etc. are Shaft and Hole designations …

Preferred tolerances and fits charts according to ANSI B4.1 standard. Running and Sliding Fits [RC]: Intended to provide a similar running performance, with suitable lubrication allowance, through out the range of sizes.

According to nominal size and fit type selection among running and sliding [RC], locational clearance [LC], locational transition [LT], locational interference [LN], force and shrink [FN] fits, size limits for hole/shaft are calculated with schematic representation of the fit.

RC4; Close Running Fits: This kind of fits are mostly for running fits on accurate machinery with moderate surface speed, bearing pressures, and journal pressures where accurate location and minimum play are desired. This kind of fits also can be described as smaller clearances with higher requirements for precision fit.

Ordinary steel parts or shrink fit on light sections. Tightest fit useable with cast iron. You enter a basic diameter (Fig 1; Dia) and select your desired fit from the calQlation options and Limits and Fits will automatically calculate the machining tolerances (maximum and minimum diameters) for both the Hole and the Shaft.

This Calculator will determine the preferred size and limit tolerances for Running or sliding to interference-locational fits per ANSI B 4.1.

Depending on the locational positioning of tolerance zones of the coupled parts, 3 types of these fits may be distinguished: Clearance fits [LC], interference fits [LN] and transition fits [LT]. This includes guaranteed interference fits specified for fixed (non-demountable) couplings of parts.

RC3 (precision running fit): Precision parts operating at slow speeds and light loads that must run freely. Changes in temperature may cause difficulties. RC4 (close running fit): Accurate location with minimum play for use under moderate loads and speeds. A good choice for accurate machinery. Clearance Fits con’t RC5 (medium running fit ...