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
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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. Wish mother public welfare Some public welfare —diameter [nominal height diameter [2,—small Es-diameter upper deviation: IS—large price —middle public advance: m-middle lower 2.Z tap screw diameter small drape with fullness difference ·Figure 1 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 JB/T8824.2-1998 (+)游E 1006100 《+) 628170 200919100506 0OCFTT E180r0 tl6oro ON1-8/S SN1 -9112 DN 81-9 SN-ZON SFE-OON SN 2-90N NOFSON SNN EON JB.TA924.1-1998 (+)Enzyme [-]Word [+]Alcohol||t t||《+)! 1B60'0 zstorowwW.bzxz.Net AN95-EO BT 882421998 [+]薛 1085691 GOLCEI 8911'0 9101'0 FBsoro 【+】 0F0'61 bot'th ANn z[- EN I-1 JNATVE ENSIBS JE8824.2-1999 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 .D.1981 Up front Zhongjingsi Basic size .2.9896 12-9134 201911 Lower bias stem Every 254 Spiral no difference Because of ten ± 35' Now few numbers 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 Quantitative theory in 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.