JB/T 8825.4-1998 JB/T 8825.4-1998 Whitworth threaded nut tap JB/T8825.4-1998 Standard download decompression password: www.bzxz.net

1C525.100.50
Mechanical Industry Standard of the People's Republic of China
JBT8825.4-1998
Nuttaps forwhitworth threads1998-12-29 Issued
National Machinery Industry Bureau
1999-07-01 Implementation
JB 825.4-199a
This standard was first issued on December 29, 198. This standard was taken over by Jinguo and the Standard Strengthening Technical Committee and belongs to the main drafting units of this standard: Shangjing Standard Parts Tool Factory, Xiaohai Cutting Tool Factory. 1 Scope
Machinery Industry Standard of the People's Republic of China
Nuttapsfar whitworihthreads
JB/T8825.4—1998
This standard specifies the type, size and marking requirements of nut taps with Whitworth threads (hereinafter referred to as nut taps). The sub-standard applies to the processing code of 1/8~2 Whitworth thread ear thread. 2 Referenced StandardsWww.bzxZ.net
The provisions contained in the following standards constitute the text of this standard by reference in this standard. When this standard was issued, the versions shown were valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: JB/T8B2S.2—1998 Whitworth Wire Pliers Screw Tolerances JB/TB253—1999 Whitworth Twisted Taps Technical Conditions 3 Types and Dimensions 3.1 The wire types with nominal diameter f<6.350mm are as shown in Figure 1. The dimensions are given in Tables 1 and 2. Rated efficiency code Ir8-40BSw 3/L6-24BSW Every 25.4mm Upper tooth efficiency Nominal diameter Note: The cutting chain length seat in the table is the recommended size. Approved by Guohao Machinery Industry Week on 1-12-29
Implementation on July 1, 1999
Thread code
3/16-32 BSF
7/3228B5F
Every 254mm
Upper thread teaching
Nominal point diameter
Note: The recommended length before center cutting is smaller than
JB/T1825.4-1998
The nominal true diameter d6.350~25.400mm is selected [without square head]. The type of the female thread of the end is shown in Figure 2, and the dimensions are given in Table 3 and Table 3.2
4.
Explosion code
t/4-20 BSW
3/B-16BSW
716-14BSW
1/2-12S
916-12BSW
5/8-11 Bs
3/4-10BSW
1-RBSW
Number of upper teeth
Nominal diameter
Note: The recommended size is the length of the middle cut 2
Screw code
174-26 Attached SF
5/16-22BSP
3/820 BSF
7/16-18DSF
1/21GBSF
9:16-16 BSF
5814BSF
3/4-[2 BSF
7/8-11 BSF
1-OBSF
Every 25.4mm
School number
Nominal diameter
Note: The cutting cone length in the table is the recommended size. JB/T8825.4-1998
3.3 The type of the tap with a nominal diameter of 6.350mm and a square head on the shank is shown in Figure 3, and the dimensions are given in Tables 5 and 6. Industry
Thread code
14-20BSW
5/16-18 BSw
3/8-16BSW
16-14 BSW
1/2-129SW
9/16-12BS
Number of upper teeth
Nominal diameter
581BSW
3/4-10BSW
J- asw
X- BSW
X-7 BSW
1-6 BSw
1-5 BSW
2-4BSW
: Bud
Nominal point diameter
Note: The cutting dimension length in the table is the push-fit size, every 25.4
Teaching code
1/4-26 BSF
≤16-22 R8F
3/820 BSF
16-18S
1/216 R8F
9/1616 BSF
5/B-149SF
3:4 12 SF
7/8-!I BSF
J-LOBSF
1X-9 8SY
1%-9BSF
1% -8 RSF
1 - RSF
1%-7RSF
2-7 SF
Number of upper teeth
Diameter of sample
Note: The cutting length in the table is the recommended size. 4
J8/T8825.4-1998
Table 5 [End]
JB/T8825.4-1998
3.4 ​​The nominal diameter of the tap is less than or equal to 7.938 mm and can be made into an external point. 3.5 The nominal cutting angle, measured in the radial plane, is recommended as follows: a) 8-10°
b) Relief angle 4,4°-6°
3.6 Marking example
Right-hand coarse thread, thread pattern code is 3/8-16BS, 6 teeth per 25.4mm, 2nd grade tolerance zone close-made taps: Whitworth thread nut tap 3/8-16B8W2B/T88254--1998 fine thread, thread pattern code is 5/16-24BSF, 24 teeth per 25.4mm, cut wire group: Whitworth thread nut tap 5/16-24BSFJB/T8825.4-1998 left-hand thread, thread pattern code is 1/2-12B5 W, 12 buds per 25.4mm, 3-grade tolerance ground tap nut thread 1.2-12BSWL-3JB/T8825.4—1998 Note: Nominal point diameter 4 net 6.350-25.4 (00nm, steel part has two structures: square head and no J head (Western handle). In occasions where it is necessary to clearly specify the structure of the part, the word "round" should be added before the name of the nut thread without a lamp head. 4 Thread male washer || tt || nut thread tap tolerance adjustment JB/T8825.2, 5 technical parts || tt || nut thread tap technical strip amine JB/TB825.3.
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