JB/T 8995.2-1999 Tolerances and fits of large sizes for large motors and turbines. Tolerance zones and fits of holes and shafts with sizes greater than 500 mm to 3150 mm.

This standard specifies the tolerance zones and fits of large-size holes and shafts of large motors and turbines. This standard applies to tolerance zones and fits of basic dimensions greater than 500mm to 3150mm. JB/T 8995.2-1999 Tolerances and fits of large-size holes and shafts of large motors and turbines Tolerance zones and fits of holes and shafts greater than 500mm to 3150mm JB/T8995.2-1999 Download the decompression password of the standard: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Tolerances and fits for large-size of large electrical machines and hydraulic turbinesTolerance strips and fits for size of holes and shaftsabove500mmto3150mmThis standard specifies the tolerance strips and fits for large-size holes and shafts of large electrical machines and hydraulic turbines. This standard is applicable to tolerance strips and fits with basic sizes greater than 500mm to 3150mm. 2
Cited Standards
JB/T8995.2—1999
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1800.2-1998 Limits and fit basis Part 2: Basic provisions for tolerances, deviations and fits GB/T1800.3-1998 Limits and fit basis Part 3: Numerical tables of standard tolerances and basic deviations JB/T8995.1-1999 Large size tolerances and fits for large motors and turbines General standard tolerances and basic deviations 3 Special, preferred, common and general purpose shaft tolerance zones Special, preferred, common and general purpose shaft tolerance zones are specified as follows, and the corresponding limit deviations are shown in Table 1. The shaft tolerance zone in the dotted box is special (used for matching), the shaft tolerance zone in the circle is preferred, and the shaft tolerance zone in the box is common. f5
h7.5 js7.5
Approved by the State Machinery Industry Bureau in 199908-06
Implementation in 200001-01
JB/T8995.2—1999
4 Special, preferred, common and general purpose hole tolerance zones Special, preferred, common and general purpose hole tolerance zones are specified as follows, and the corresponding limit deviations are shown in Table 2. The hole tolerance zone in the dotted square is special (used for matching), the hole tolerance zone in the circle is preferred, and the hole tolerance zone in the square is common. H5
5 Basic hole system preferred and common fit
Basic hole system preferred and common fit are specified in Table 3. 6 Mixed fit
In order to meet the requirements of clearance and large interference fit, this standard recommends a part of mixed fit (i.e., fit composed of any hole and shaft tolerance zones) as shown in Table 4.
7 Calculation of hole and shaft tolerance zones according to clearance or interference For calculation of hole and shaft tolerance zones according to clearance or interference, see Appendix A (Standard Appendix) 100
JB/T8995.2—1999
JB/T8995.2—1999
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JB/T8995.2—1999
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JB/T8995.2—1999
Table 4 Mixed Matching (Recommended)
Interference Matching
Interference Matching
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