JB/T 8824.2-1998 Unified thread tap thread tolerances

This standard specifies the limit deviations of thread profile and size of taps with unified threads (hereinafter referred to as taps). This standard applies to taps for processing unified threads. JB/T 8824.2-1998 Unified thread tap thread tolerance JB/T8824.2-1998 Standard download decompression password: www.bzxz.net

ICS 25.100.58
Standard of the Machinery Industry of the People's Republic of China
JB/T8824.2-1998
Unified thread taps
Thread tolerances
Manufacturing tolerances on the threaded portion far unified threads taps1998-12-29 Issued
National Machinery Industry Standard
1999-07-01 Implementation
3B/T8824.2—1998
This standard is formulated with reference to the relevant parts of the American standard ANSIB94.9-1987 Cutting and processing of thread taps. Among them, the limit deviation of the main diameter, the pitch deviation and the deviation of the tooth profile flat half angle are equivalent to the American standard. According to my country's national conditions, the limit deviation of the middle diameter is calculated. This standard was first revised and issued on December 29, 1998. Appendix A of this standard is a suggestive appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Knives and Others. The main drafting unit of this standard is Shanghai Ruyi Factory. Scope
Mechanical Industry Standards of the People's Republic of China
Thread tolerances of unified thread taps
ManufaciuringtoleraacesonthethreadedportianfarnifiedthreadstapsJB/8824.2-1998
This standard specifies the limit deviations of thread profile and size of unified thread taps (hereinafter referred to as taps for processing unified threads). This standard is applicable to taps for processing unified threads. The thread profile and size of the taps are shown in Figure 1.
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7.7.1 The limit deviation of the wire making lithium size is given in Table 1 and Table 2 (the small diameter limit difference is determined by Guohao Machinery Industry Approved on December 29, 1998, implemented on July 1, 1999
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The limit deviation of cutting tap size is shown in Table 3, where the ratio is given: (the limit deviation of the minor diameter is currently set as: 2. 2. 2 | | tt | NC
N.12-24 [FNC
2.16-18 LNC
28-151NG
T6-14 LNC
12-131NC
916-121M
3:419 UNC
7:8-9LNC
[AT UNC
LX-TUNC
1X-6UNC
X-6LNC
IX SUNG:
2-TUNC
T1. 2 3ny
Human diameter d
Stem size
34 925
38 t00
50 030
Lower bias
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Up front
Zhongjingsi
Basic size
.2.9896
12-9134
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Lower bias stem
Every 254
Spiral no difference
Because of ten
± 35'
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No.0-SD UNr
Nu1-72 (NF
No.2-64 UNF
No.356 UNF
No.4-4 UNF
Nor.5-44UNF
Nu6-40 UNF | |916-1A IINF
5/818 UNF
416 LNF
28-J4UNF
-12 UNE
X-12UNF
IX-12 UNF
1X -12 LNF
1K-12UNF
JB/T 8824.2-1998
Major diameter d
Basic size
Lower deviation
Upper deviation
Zhongjingxi
Basic code
Lower deviation
Upper deviation
mso l:
Pitch end difference
National Semi-city
± 4s'
JB/T August 24.2-1998
(Based on the attached
Corresponding relationship between tap middle diameter tolerance zone and internal thread middle diameter tolerance zone A1 The corresponding relationship between wire chain middle diameter tolerance zone and internal explosion thread middle diameter tolerance zone is shown in Figure A1. Internal control Chinese capital public whole situation
Natural chain middle diameter empty whole zone
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