This standard specifies the diameter and pitch series, basic dimensions, tolerances and fits, and deviation tables of special fine pitch threads for optical instruments with nominal diameters of 4mm-260mm. This standard applies to special fine pitch threads for optical instruments with nominal diameters of 4mm-260mm. JB/T 9313-1999 Special fine pitch threads for optical instruments JB/T9313-1999 Standard download decompression password: www.bzxz.net

JB/T9313—1999
This standard is a revision of ZBN30006.--88 "Special fine pitch threads for optical instruments". During the revision, editorial changes were made to the original standard, and the main technical content remained unchanged.
This standard replaces ZBN30006-88 from the date of implementation. Appendix A of this standard is a prompt appendix.
This standard was proposed and managed by the National Technical Committee for Standardization of Optics and Optical Instruments. The responsible drafting unit of this standard: Shanghai Institute of Optical Instruments. This standard was first issued in October 1979 and revised for the first time in November 1988. 720
1 Scope
Machinery Industry Standard of the People's Republic of China
Special kind of fine screw for optical instruments
Special kind of fine screw for optical instrumentsJB/T 9313—1999
Replaces ZBN30006--88
This standard specifies the diameter and pitch series, basic dimensions, tolerances and fits, and deviation tables of special kind of fine screw for optical instruments with nominal diameters of 4mm to 260mm.
This standard applies to special kind of fine screw for optical instruments with nominal diameters of 4mm to 260mm. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is released, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 192—1981
GB/T 193 ---1981
Basic tooth profile of common thread
Common thread
GB/T 197--1981
Common thread
3 Basic tooth profile
Diameter and pitch series (diameter 1~600 mm) tolerance and fit (diameter 1~355 mm)
The basic tooth profile of this standard shall be in accordance with the provisions of GB/T192. 4 Diameter and pitch series
4.1 Diameter and pitch series shall be in accordance with the provisions of Table 1. 4.2 The first series shall be preferred for thread diameter, followed by the second series and the third series. 4.3 For the same nominal diameter, the larger pitch shall be preferred within the allowable range. 4.4 Thread code
Special fine thread for optical instruments is represented by the letters "TM" and "nominal diameter × pitch". When the thread is left-handed, add "left" after the thread code:
Example 1TM23×0.5 means the nominal diameter is 23mm, the pitch is 0.5mm, and the direction is left-handed optical instrument special fine thread. Example 2TM23×0.5left means the nominal diameter is 23mm, the pitch is 0.5mm, and the direction is left-handed optical instrument special fine thread.
Nominal diameter D, d
First series
Second series, third series
Approved by the State Bureau of Machinery Industry on August 6, 19991
Special fine pitch
Implemented on January 1, 2000
Nominal diameter D, dWww.bzxZ.net
First series
Second series, third series
JB/T 9313 -- 1999
Table 1 (continued)
Special fine pitch
Nominal diameter D, d
First series
Second series
Third series
JB/T 9313—1999
Table 1 (continued)
Special fine pitch
Nominal diameter D,d
First series
Second series
Basic dimensions
Third series
JB/T 9313—1999
Table 1 (end)
Special fine pitch
The basic dimensions of this standard shall comply with the requirements of Figure 1 and Table 2. The values ​​in Figure 1
The table are calculated using the following formula and are rounded to the third decimal place. D,= D-2×H;
d=d-2×H;
D = D-2×%H;
First series
Nominal diameter D,d
Second series
JB/T 9313 --- 1999
d =d2×
Y3p = 0. 866 025 404P.
Third series
Dz or d:
First series
Nominal diameter D, d
Second series
JB/T 9313-—1999
Table 2 (continued)
Third series
Da or d2
D or di
First series
Nominal diameter Dd
Second series
JB/T 9313 --- 1999
Table 2 (continued)
Third series
China
Dz or de
First series
Nominal diameter Dd
Second series
JB/T 9313-1999
Table 2 (continued)
Third series
D or d2
D, or d
First series
Nominal diameter D).d
Second series
JB/T 9313 ---1999
Table 2 (continued)
Third series
Dz or d2
164,026
D or di
First series
6 Tolerances and fits
Nominal diameter Dd
Second series
6.1 Thread tolerance zone and screw-in length
JB/T9313—1999
Table 2 (end)
Third series
6.1.1 The thread tolerance zone shall be in accordance with the provisions of GB/T197. P
Medium diameter
D, or d
Di or di
6.1.2 The thread engagement length is divided into three groups, namely short engagement length, medium engagement length and long engagement length, with the corresponding codes S, N and, and their values ​​are in accordance with the provisions of Table 3.
Nominal diameter Dd
6.2 Selection of thread tolerance zone and fit
The selection of internal and external thread tolerance zones shall be in accordance with the provisions of Table 4 and Table 5. 730
Screwing length
Accuracy
JB/T9313—1999
Table 4 Selection of internal thread tolerance zone
Tolerance zone position H
(4H)
Table 5 Selection of external thread tolerance zone
Tolerance zone position g
Note: The tolerance zones in brackets should be used as much as possible. 6.3
Thread root shape
Optical instrument special fine pitch thread root shape shall comply with the provisions of GB/T197. Deviation table
Optical instrument special fine pitch internal and external thread limit deviations shall comply with the provisions of Table 6. Table 6
Diameter segmentation
Tolerance zone
Internal thread
Pitch diameter D
Minor diameter D
(5h6h）
Tolerance zone
Tolerance zone position h
External thread
Pitch diameter d2
(7h6h)
Major diameter d
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.