Dimensional tolerance control capability

Xavier can provide production services to help you achieve the strictest tolerance required for non-standard custom CNC machined parts.
The tolerance table covers common tolerance features in mechanical drawing. If you are a senior designer, you’re also worried about whether the strict tolerance requirements in drawings can achieve stable production, then it can help you analyze the production feasibility, as a pre-design reference.

CNC Machining TolerancesLinear dimension range(mm)
TypeGeometric CharacteristicsSymbol0.5 – 33 – 66 – 3030 – 120120 – 400400 – 10001000 – 2000
DimensionLength ± 0.01± 0.02± 0.05± 0.1
Diameter  0.0060.010.0150.02————
Angle   ± 0.03± 0.05± 0.15——
FormStraightness 0.0030.0050.010.02——
Flatness 0.0010.0030.010.030.050.15
Circularity  0.0010.0020.0050.01————
Cylindricity 0.0030.0050.010.05————
ProfileProfile of a line 0.0050.020.050.10.150.3
Profile of a surface0.010.020.050.10.150.3
OrientationParallelism 0.0030.0050.020.050.1——
Perpendicularity 0.0030.0050.010.050.1——
Angularity 0.0030.050.1——
LocationPosition 0.010.020.050.10.2
Concentricity 0.0030.0050.010.05————
Symmetry 0.010.020.050.1——
RunoutCircular Runout 0.0020.0050.010.05——
Total Runout  0.0030.0050.010.05——

The importance of general tolerances

In order to simplify the tolerance marking without affecting the product structure and use requirements, the general tolerance standard will be marked on the drawing to unify product production and inspection standards to ensure that the product meets the design requirements, so the manufacturer must be familiar with the general tolerances which are from various versions of ISO dimensional tolerance standards.

The Standard of General Tolerances 
 ISO 2768-1(1991-06) Linear and Angles Tolerances                                                
Grade of Tolerance
Edge Tolerance mm  Rated Size Range
0.5
To 3
3
To 6
6
To 30
30
To 120
120
To 400
400
To 1000
1000
To 2000
2000
To 4000
Fine±0.05±0.05±0.1±0.15±0.2±0.3±0.5 
Middle±0.1±0.1±0.2±0.3±0.5±0.8±1.2±2
Coarse±0.2±0.3±0.5±0.8±1.2±2±3±4
Very Coarse±0.5±1±1.5±2.5±4±6±8
Grade of ToleranceChamfer(R & C)
Edge Tolerance mm
Rated Size Range
Edge Tolerance Degree and Prime
Rated Size Range(shorter angle side)
0.5
To 3
3
To 6
Over than
6
To 1010
To 50
50
To 120
120
To 400
Over than
400
Fine±0.2±0.5±1±1°±0°30′±0°20′±0°10′±0°5′
Middle
Coarse±0.4±1±2±1°30′±1°±0°30′±0°15′±0°10′
Very Coarse±3°±2°±1°±0°30′±0°20′
 ISO 2768-2(1991-04) Form and Location Tolerances                                                    
Grade of ToleranceTolerance mm
                                              
Rated Size Range mmRated Size Range mm
(shorter angle side)
Rated Size Range mm
(shorter graphic elements)
 
To
10
10
To
30
30
To
100
100
To
300
300
To
100
100
0
To
To
100
100
To
300
300
To
1000
1000
To
3000
To
100
100
To
300
300
To
1000
1000
To
3000
H0.020.050.10.20.30.40.20.30.40.50.50.1
K0..00.10.20.40.60.80.40.60.810.60.810.2
L0.10.20.40.81.21.60.611.520.611.520.5
General Tolerances: Linear, Angles, Form, Location
Grade of Tolerance
Edge Tolerance mm  Rated Size Range
0.5
To 3
3
To 6
6
To 30
30
To 120
120
To 400
400
To 1000
1000
To 2000
2000
To 4000
4000
To 8000
Fine±0.05±0.05±0.1±0.15±0.2±0.3±0.5 ±0.8
Middle±0.1±0.1±0.2±0.3±0.5±0.8±1.2±2±3
Coarse±0.15±0.2±0.5±0.8±1.2±2±3±4±5
Very Coarse±0.5±1±1.5±2±3±4±6±8
Grade of ToleranceChamfer(R & C)
Edge Tolerance mm
Rated Size Range
Edge Tolerance Degree and Prime
Rated Size Range(shorter angle side)
0.5
To 3
3
To 6
6
To 30
30
To 120
120
To 400
To
10
10
To 50
50
To 120
120
To 400
over than
400
Fine±0.2±0.5±1±2±2±1°±30′±20′±0°10′±5′
Middle
Coarse±0.4±1±2±2±2±1°30′±50′±25′±15′±10′
Very Coarse±3°±2°±1°±30′±20′
Grade of ToleranceTolerance mm
                                                                                                                 
To 66
To 30
30
To 120
120
To 400
400
To 1000
1000
To 2000
2000
To 4000
shorter graphic element 
0.0040.010.020.040.070.1— 0.30.1
S0.0080.020.040.080.150.20.30.50.2
T0.0250.060.120.250.40.60.910.5
U0.10.250.511.52.53.521

Fit Tolerance Definition

Fit tolerance is the sum of the hole and shaft tolerances that make up the fit. It is the amount of variation that allows for clearance or interference. The size of the tolerance zone and the position of the tolerance zone for the hole and shaft make up the fit tolerance. The size of the hole and shaft fit tolerance indicates the fit accuracy of the hole and the shaft. The size and position of the hole and shaft fit tolerance zone indicate the fit accuracy and fit nature of the hole and shaft. The size of the fit tolerance = the size of the tolerance zone; the size and position of the fit tolerance zone = the nature of the fit.

 General Fits Tolerances
 H6H7H8H9Applicable PartFunctional ClassificationApplication Example
Can be Moved RelativelyClearance FitLoose Fit   c9Part which accommodates a wide gap or moving part which needs a gap.
Part which accommodates a wide gap to facilitate assembling.
Part which needs an appropriate gap even at a high temperature.
Part whose structure needs a gap.
 Inflates. Large position error
 Fitting length is long.
Cost needs to be reduced.
 Manufacturing Cost
 Maintenance Cost
Piston Ring and the Ring Groove
Fitting by means of a loose set pin.
Light Roll Fit  d9d9Part which accommodates or needs a gap.Crank Web and Pin Bearing(Side)
Exhaust Valve Box and the Sliding Part of a Spring Bearing
Piston Ring and the Ring Groove
 e7e8e9Part which accommodates a wide gap or needs a gap.
Fairly wide gap, well greased bearing.
Bearing subjected to a high temperature, high speed and heavy load
(high-degree forced lubrication).

Regular Rotary or Sliding Part
(Must be well greased.)

Regular Fitting
(Often comes apart.)

Fitting of the Exhaust Valve Box
Main Bearing for the Crank Shaft
Regular Sliding Part
Roll Fitf6f7f7
f8
 Fitting so as to provide an appropriate gap to permit movement(high-quality fitting).
Regular normal temperature bearing lubricated with grease or oil.
Part in which a cooled exhaust valve box is inserted.
Regular Shaft and Bushing
Link Device Lever and Bushing
Fine Roll Fitg5g6  Continuously revolving part of a precision machine under a light load.
Fitting with a narrow gap so as to permit movement(spigot and positioning).
Precision sliding part.
Part required to make a precision motion
with virtually no play
Link Device Pin and Lever
Key and its Groove
Precision Control Valve Rod
Cannot be Moved RelativelyTransition FitSliding Fith5h6h7
h8
h9Fitting so as to permit movement by hand, with a lubricant applied.(high-quality positioning)
Special High Precision Sliding Part
Unimportant Stationary Part
Can be disassembled,
reassembled without
damaging component
parts.
Force cannot be
transmitted by the
fitting force alone.
Fitting a rim and a boss together
Fitting the gear of a precision gear device
Push Fith5
h6
js6  Fitting which accommodates a light gap.
Precision fitting which locks both parts while the unit is used.
Fitting which allows assembling and disassembling with a wooden or lead hammer.
Fitting Coupling Flanges Together
Governor Path and Pin
Fitting a Gear Rim and a Boss Together
Driving Fitjs5k6  Fitting which requires an iron hammer or hand press for assembling, disassembling(a
key or the like is necessary to prevent inter-part shaft rotation).
Precision positioning.
Fixing the Shaft of a Gear Pump and a Casing Together
Reamer Bolts
k5m6  Same as the above for assembling and disassembling.
Precision positioning which allows no gap.
Reamer Bolts
Fixing the piston of hydraulic equipment and a shaft together
Fitting a Coupling Flange and a Shaft Together
Light Press Fitm5n6  Fitting which requires considerable force for assembling, disassembling.
Precision stationary fitting(a key or the like is necessary for high torque transmission purposes)
Slight force can be
transmitted by the
fitting force alone.
Shaft of a Flexible Coupling and Gear(Passive Side)
Precision Fitting
Insertion of a Suction Valve and Valve Guide
Interference FitPress Fitn5
n6
p6  Fitting which requires much force for assembling, disassembling
(a key or the like is necessary for high torque transmission).
 Light press fitting or the like is necessary for non-ferrous component parts.
Standard press fitting is required for iron component parts and a bronze part and a copper part.
Hard to disassemble
without damaging
component parts.
Insertion of a Suction Valve and Valve Guide
Fixing a Gear and a Shaft Together(Low Torque)
Shaft of a Flexible Coupling and a Gear(Drive Side)
Strong Press Fit, Shrinkage Fit, Freeze Fitp5r6  Same as the above for assembling and disassembling
Shrinkage press fitting, cold press fitting or forced press fitting is required for large component parts.
Coupling and Shaft
r5s6  Firmly coupled together and requires shrinkage press fitting, cold press fitting or
forced press fitting. Permanent assembly, which can not come apart.
Press fitting or the like is required for light alloy members.
Considerable force can
be transmitted by the
fitting force alone.
Attaching and Fixing a Bearing Bushing
t6  Insertion of a Suction Valve and Valve Box
Fixing a Coupling Flange and a Shaft Together
u6  Fixing the Rim of a Drive Gear and a Boss Together
Attaching and Fixing a Bearing Bushing
x6  
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