This standard specifies the structural type, dimensional deviation, technical requirements, marking and other contents of the thread gauge for gas cylinders. This standard is applicable to the gauges used to inspect the conical and cylindrical threads specified in GB 8335-1998 "Special Threads for Gas Cylinders". GB/T 8336-1998 Special Thread Gauge for Gas Cylinders GB/T8336-1998 Standard download decompression password: www.bzxz.net

GB/T8336-1998
This standard is applicable to the gauges for testing the conical threads for gas cylinders and the cylindrical pipe threads for bottle caps and collars. Compared with the original GB8336-87 standard, this standard deletes the M80X3 ordinary thread specification (because there is a corresponding national standard) and increases the comprehensive deviation of the middle diameter of the conical thread from the original ±0.18 to +.18 for the external conical thread and -\.18 for the internal conical thread. The step size of the gauge has also been changed accordingly, from the original two-way variation of ±1.5mm to the one-way variation of +1.5mm. This standard replaces the entire content of the original GB8336-87. This standard shall be implemented from October 1, 1998. This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Gas Cylinders. Drafting units of this standard: Shanghai Tianhai Valve Co., Ltd., Chengdu Measuring and Cutting Tools General. The main drafters of this standard are: Cai Yanxin, Gu Yongliang, Mao Chongni, Chen Weiming, Wang Ronggang. 671
1 Scope
National Standard of the People's Republic of China
Special thread gauges for gas cylinders
Special thread gauges for gas cylindersGB/T 8336—1998
Replaces GB8336-87
This standard specifies the structural type, dimensional deviation, technical requirements, marking and other contents of thread gauges for gas cylinders. This standard is applicable to gauges for testing tapered threads and cylindrical threads specified in GB8335—1998 "Special threads for gas cylinders". 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 published, 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/T1804---92 General tolerance linear dimensions without tolerance GB3934-83 Ordinary thread gauge
GB6403.3--86 Knurling
GB 8335-1998
Special thread for gas cylinders
3 Definitions, names and symbols
3.1 The values ​​specified in this standard are based on standard measurement conditions, i.e., temperature is 20°C and measuring force is zero. 3.2 Names and functions of thread gauges
3.2.1 Conical smooth plug gauge
A gauge for checking the minor diameter and taper of the conical internal thread of the cylinder mouth. 3.2.2 Conical smooth ring gauge
A gauge for checking the major diameter and taper of the conical external thread at the tail of the cylinder valve. 3.2.3 Conical calibration smooth plug gauge
A gauge for calibrating the size of the conical smooth ring gauge. 3.2.4 Taper thread plug gauge
A gauge for checking the middle diameter of the tapered internal thread at the mouth of a steel cylinder. 3.2.5 Taper thread ring gauge
A gauge for checking the middle diameter of the tapered external thread at the tail of a cylinder valve. 3.2.6 Taper calibration thread plug gauge
A gauge for calibrating the middle diameter and wear of the tapered thread working ring gauge. 3.2.7 Cylindrical smooth plug gauge
A gauge for checking the minor diameter of the bottle cap thread.
3.2.8 Cylindrical thread plug gauge
A gauge for checking the middle diameter of the bottle cap thread.
3.2.9 Cylindrical thread ring gauge
Approved by the State Administration of Technical Supervision on March 20, 1998 2
Implemented on October 1, 1998
A gauge for checking the middle diameter of the collar thread.
3.2.10 Plug gauge for cylindrical thread calibration
GB/T 8336 - 1998
Gauge used to calibrate the mean diameter and wear of cylindrical thread ring gauge. 3.2.11 The code and characteristics of cylindrical thread gauge refer to the provisions of GB3934. 3.3 Symbols
Vertical distance from the cutting plane of the conical (thread) plug gauge to the outer surface of the large end of the plug gauge. m
Step height of the conical (thread) gauge.
Total length of the conical (thread) plug gauge head.
d. Diameter of the installation position of the plug gauge cone handle
Vertical distance from the cutting plane of the conical (thread) ring gauge to the outer surface of the ring gauge. b—Gap width of the thread profile at the root of the thread. f—Thread chamfer width of the conical thread ring gauge. Note: Other symbols shall be in accordance with the provisions of GB8335. 4.1 The structural type and size of the tapered smooth plug gauge and ring gauge shall be in accordance with the provisions of Figure 1 and Table 1. 4.2 The structural type and size of the tapered thread plug gauge and ring gauge shall be in accordance with the provisions of Figure 2, Figure 3 and Table 2. 0.8%
0.5×45°
Reticulated mo.4
Thread code
Basic size limit deviation
PZ39 36. 286
2±0.01022
PZ27.825. 472
PZ19.216.872
GB/T8336-1998
Dimensions and deviation rings of tapered smooth plug gauges and ring gauges
Basic
Dimensions
Limiting basic
604017.67
±0.01648
15111640.5019.2
Parallel line of axis
402416.00
±0.021.5
1: 50
0.5×45°wwW.bzxz.Net
Plug gauge and ring gauge
Thread code
Basic size
GB/T8336—1998
1×45°
Axis parallel line
Dimensions and deviations of taper thread plug gauges and ring gauges Table 2
Limit deviation
Basic size
Limit deviation
After wear
Allowable value
Network mo.4
Thread code
Limit deviation| |tt||Basic dimensions
GB/T8336—1998
Table 2 (Complete)
After wear
Allowable value
Basic limit deviation
Dimensions of ruler, plug gauge and ring gauge
Basic dimensions
2.117±0.006±0.008
1.814|±0.005
Limit deviation
Ring gauge, plug gauge and ring gauge
4.3 The structural type and dimensions of the tapered smooth plug gauge shall be in accordance with the provisions of Figure 4 and Table 3. 3°26
Table 3 Dimensions and deviations of taper-calibrated smooth plug gauges d
Thread code
Basic size limit deviation
Basic size limit deviation
±7±15
0.5×45″
GB/T8336—1998
4.4 The structural type and dimensions of taper-calibrated thread plug gauges shall comply with the provisions of Figure 5, Table 4 and Table 5. Base surface
Axis parallel line
Thread code
Basic size limit deviation
Dimensions and deviations of taper-calibrated thread plug gauges d,
Basic size limit deviation
Basic size limit deviation
>1+ 50
0.5×45°
Not more than
Not more than
Not more than
Thread code
GB/T8336—1998
Table 5 Dimensions and deviations of taper-calibrated thread plug gaugesBasic dimensions
Limit deviation
Not more than
Not more than
4.5When calibrating a taper-calibrated smooth ring gauge with a taper-calibrated smooth plug gauge, the base surface of the ring gauge should be flush with the base surface of the calibration plug gauge. The allowable value of the unevenness shall be in accordance with the provisions of Table 6.
Table 6 Unevenness of the base surface of the taper-calibrated smooth ring gauge and the base surface of the calibration plug gaugeThread code
Base surface of the taper-calibrated smooth ring gauge and the base surface of the calibration plug gauge The unevenness value of the base surface of the cone calibration plug gauge shall not exceed 0.25
not exceed 0.22
4.6 Check whether the working ring gauge of the tapered thread is qualified, and the cone calibration plug gauge shall be used as the standard. The base surface of the working ring gauge and the base surface of the calibration plug gauge shall be flush, and the allowable value of unevenness shall not exceed 0.2mm. Note
1 The inclination angle deviation of the circular thread gauge refers to the allowable variation of the length on L. 2 The limit deviation of the tooth half angle is determined by the arithmetic mean of the absolute values ​​of the two half angle deviations. 3 The pitch deviation refers to the difference between the distance between any teeth on the effective length of the thread and the nominal distance. 5 Cylindrical thread gauge
5.1PG80 cylindrical thread gauge
5.1.1 The structural type and dimensions of cylindrical smooth plug gauges shall be in accordance with the provisions of Figure 6, Table 7 and Table 9. 2×45°
2X45°
Thread code
Gauge name
Through end smooth plug gauge
Smooth plug gauge
GB/T8336-1998
Table? Dimensions and deviations of cylindrical smooth plug gauges Gauge code
Limit deviation
Limit value after wear
5.1.2 The structural type and dimensions of cylindrical thread plug gauges and cylindrical thread ring gauges shall be in accordance with the provisions of Figure 7, Figure 8 and Table 8. Table 9. 2×45°
2×45°
1×45°
2×45°
Reticulated mo.4
a Go gauge
b Stop gauge
2×45°
, Reticulated mo.4
Thread code
Thread code
Gauge name
Full diameter thread plug gauge
Stop end thread plug gauge
Full diameter thread ring gauge
Stop end thread ring gauge
GB/T 8336—1998
Dimensions and deviations of cylindrical thread plug gauges and ring gauges Table 8
Limit deviation basic dimensions
Basic dimensions「
Da(de)
Limit deviation
General dimensions and deviations of gauges
The dimensions of cylindrical thread calibration plug gauges shall be in accordance with the provisions of Figure 7, Table 9 and Table 10. Table 10
Thread code
Gauge name
Calibration-through thread plug gauge
Calibration-through-stop thread plug gauge
Calibration-through-loss thread plug gauge
Calibration-stop-through thread plug gauge
Calibration-stop-stop thread plug gauge
Calibration-stop-loss thread plug gauge
5.1.4 Thread profile of thread gauge
Dimensions and deviation numbers of cylindrical thread calibration plug gauges
After wear
Limit value
Dr(di)
Basic size
Limit deviation
Complete profile
【Truncate profile
Basic size limit deviationBasic size limit deviationBasic size limit deviation
≤77.012
Complete thread profile shall be in accordance with the provisions of Figures 9 and 10. The profile of Figure 9 is for T, TT, ZT, ZZ, ZS plug gauges and the profile of Figure 10 is for T ring gauges.
W enlarged view
b maximum 0. 57
GB/T8336—1998
X Enlarged view
5.1.4.2 The truncated thread profile shall comply with the provisions of Figures 11 and 12. The profile of Figure 11 is used for Z, TZ, and TS plug gauges, and the profile of Figure 12 is used for Z ring gauges.
Y Enlarged view
, the gap is deeper than
Z Enlarged view
The gap is deeper than
5.1.4.3 The center line of the gap groove is allowed to have an offset S relative to the center line of the thread profile, and S should be less than 0.05mm, see Figure 13. Center line of thread profile
Center line of source sugar
6 Technical requirements
GB/T 8336-1998
6.1 The appearance of the gauge shall not have defects such as rust, burrs, cracks, etc. that affect the performance. 6.2 The straightness error of the thread gauge tooth profile shall not exceed 0.002mm. 6.3 The incomplete tooth profile shall be cut off at the small end of the tapered thread plug gauge, the large end of the ring gauge and both ends of the cylindrical thread gauge. All sharp edges shall be blunted. 6.4 The connection between the probe and the handle of the thread plug gauge shall be firm and reliable, and shall not loosen or fall off during use. 6.5 The mesh shall comply with the provisions of GB6403.3m0.4. 6.6 The limit deviation of the un-toleranced size shall comply with GB/T1804-m grade. 6.7 The hardness of the working part of the thread gauge shall be HRC58~65. 6.8 The gauge shall be aged during the manufacturing process. 7 Markings and Others
7.1 The following should be clearly marked on the gauge:
a) manufacturer’s trademark;
b) year of manufacture;
c) gauge type or purpose code;
d) gauge thread code.
Example 1 Working gauge with thread code PZ19.2 produced by ×X factory in ×X: (factory trademark) XX
Through end thread gauge or smooth gauge with thread code PG80 produced by XX factory in ×X: Example 2
(factory trademark) XXT
Verification gauge with thread code PZ27.8 produced by XX factory in XX: Example 3
(factory trademark) XXVerification
Example 4 Verification through-stop thread plug gauge with thread code PG80 produced by XX factory in XX: (factory trademark) XXVerificationTZ
7.2 The marking of the gauge should be on the end plane of the ring gauge or plug gauge probe. 7.3 The gauge should be carefully cleaned before leaving the factory, properly packaged after anti-rust treatment and attached with a certificate of conformity. 15821 The following should be clearly marked on the gauge:
a) manufacturer's trademark;
b) year of manufacture;
c) type or purpose code of the gauge;
d) thread code of the gauge.
Example 1 Working gauge with thread code PZ19.2 produced by ×X factory in ×X: (factory trademark) XX
Through end thread gauge or smooth gauge with thread code PG80 produced by XX factory in ×X: Example 2
(factory trademark) XXT
Verification gauge with thread code PZ27.8 produced by XX factory in XX: Example 3
(factory trademark) XXVerification
Example 4 Verification through-stop thread plug gauge with thread code PG80 produced by XX factory in XX: (factory trademark) XXVerificationTZ
7.2 The marking of the gauge should be on the end plane of the ring gauge or plug gauge probe. 7.3 The gauge should be carefully cleaned before leaving the factory, properly packaged after anti-rust treatment and attached with a certificate of conformity. 15821 The following should be clearly marked on the gauge:
a) manufacturer's trademark;
b) year of manufacture;
c) type or purpose code of the gauge;
d) thread code of the gauge.
Example 1 Working gauge with thread code PZ19.2 produced by ×X factory in ×X: (factory trademark) XX
Through end thread gauge or smooth gauge with thread code PG80 produced by XX factory in ×X: Example 2
(factory trademark) XXT
Verification gauge with thread code PZ27.8 produced by XX factory in XX: Example 3
(factory trademark) XXVerification
Example 4 Verification through-stop thread plug gauge with thread code PG80 produced by XX factory in XX: (factory trademark) XXVerificationTZ
7.2 The marking of the gauge should be on the end plane of the ring gauge or plug gauge probe. 7.3 The gauge should be carefully cleaned before leaving the factory, properly packaged after anti-rust treatment and attached with a certificate of conformity. 1582
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