tolerance values
tolerance values
(OP)
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS ARE IN INCHES.
TOLERANCES:
.X±.1
.XX±.01 (could be .XX±.015 too!)
.XXX±.005
.XXXX±.0005
ANGLES±1º
which standard we have to find above tolerance values and where its mention. kindly help me..
DIMENSIONS ARE IN INCHES.
TOLERANCES:
.X±.1
.XX±.01 (could be .XX±.015 too!)
.XXX±.005
.XXXX±.0005
ANGLES±1º
which standard we have to find above tolerance values and where its mention. kindly help me..





RE: tolerance values
RE: tolerance values
For example, the company I work for uses (inch units):
.X = ±.06
.XX = ±.015
.XXX = ±.005
ANGLES = ±1/2º
For comparison, API 6A uses (for inch units):
X.XX = ±0.02
X.XXX = ±0.005
(no specification for angles)
Some companies use different tolerances for machining drawings versus fabrication drawings, and some insist on a single set of tolerances regardless of process (to avoid possibility of mistakes due to assumptions). ASME drawing standards do not specify any particular standard generic tolerances. ISO does have a standard on tolerance grades, but that would require specifying the tolerance grade on the drawing in place of generic tolerances.
There is no single system to invoke, so it seems companies do whatever they decide to do.