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Machine Processes Tolerance Grades

Reference data and engineering information about machine processes tolerance grades for miscellaneous applications.

machineprocessestolerancegrades

Overview

Engineering reference data for Machine Processes Tolerance Grades in miscellaneous.

Key Formulas

Unit Conversion

y=x⋅ky = x \cdot k

Multiply by conversion factor.

Linear Interpolation

y=y1+(x−x1)(y2−y1)x2−x1y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}

Estimate between two known points.

Percentage

p=partwhole×100%p = \frac{\text{part}}{\text{whole}} \times 100\%

Part as fraction of whole.

Variables

Symbol Description Unit
xx Input value —
yy Output value —
kk Conversion factor —

Machine Process Tolerance Grades

The following table shows the range of tolerance grades (IT4 to IT13) that various machine processes may produce under normal conditions, according to the ANSI B4.1 standard.

Note: This data is based on the ANSI B4.1 standard. A ✓ indicates that the process is typically capable of producing tolerances within that grade. A tolerance grade (like IT7) represents a standardized range of permissible size variations for a given nominal size.

References