This standard specifies the basic requirements for the type, size and marking of unified thread taps (hereinafter referred to as taps). This standard is applicable to the processing of unified thread taps with thread codes No. 0 to No. 12 and 1/4 to 121. JB/T 8824.1-1998 Unified thread taps JB/T8824.1-1998 Standard download decompression password: www.bzxz.net

[CS 25.100.50
Standard of the Machinery Industry of the People's Republic of China
JB/T 8824.1--1998
Taps for unified threads
Published on 1998-12-29
National Bureau of Machinery Industry
Implemented on 1999-07-01
JB/8824.1-1998
This standard is formulated with reference to the unified thread thread part in the American Standard ANSIB94.91987 "End of Cutting and Grinding": The type scale and this standard.
The rate standard was first issued on December 29, 1998. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Wanqi Standardization Technical Committee. The main chapter unit of this standard: Shanghai Cutting Tool Factory. Scope
Machinery Industry Standard of the People's Republic of China
Unified thread taps
Tapa for unfled threads
JR/T 8824,1-1998
This standard specifies the basic requirements for the type, size and marking of unified thread taps [hereinafter referred to as taps]. This standard is applicable to unified thread taps with the code No. 12, No. 4, 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 the standards should explore the possibility of using the following standard versions. JB/T8824.2-1998 Unified threaded wire thread tolerances JB/T8824.3-1998 Unified technical conditions for bursting wire 3 Types and sizes
3.1. The types of thick shank wire are as shown in the figure and the sizes are given in Tables 1 and 2. 4/
Wave code
No.1-64uNG
No.2-56UNC
Mo.3-4SUr+C
, Upper teeth
Nominal diameter
Approved by the State Machinery Industry Bureau J998-12-29
1999-07-01implemented
Number code
No.4-40 UNC
Na.5-40 LNC
Na632UNC
No.8-32 UNC
No. 10-24 UNC
No. 1224 UNC
Spiral code:
No.0RO UNE
No1 UNF
Na.2-64 UNF
Ne UNF
No.5-44 UNF
N0.0-40UNY
No.836 LNF
NO.10-2UNE
No.12-28 UNF
Number of upper teeth||t t||Nominal matching diameter
Direct diameter of public association
.3 175
JB788241-1998
Table! (End)
Heart 353
3. 2 The type of the stalk with neck is shown in Figure 2, and the wind size is given in Table 3 and Table 4. A
Smoke code
1:4-20NC
5/16-18 UNC
3.8-16 (NC
Explosion code
1/4-28UNP
5416-24UNE
3/8-24 LNF
Small thread effect
Number of upper threads
Nominal civil road
Nominal diameter
JB/T8824.[-1998
As given in Table 6,
The type of thin handle taps is as shown in National 3, and the size is in Table 5. A
Thread code
T16-14LNC
L2-[3 UNC
9/16-12 UN
3/4-1O LN core
7.8-9 UNC
1-8 UNC
Upper thread effect
Nominal suitable diameter
Thread effect code
1X-7 tNC
1%-7 LNC
1X -6 UNC
1% -5 UNC
2-4K UNC
Screw code
1/2-20UNF
9/16-18 UNFbzxz.net
5/8-18 UNF
3/4-16TNF
7/8-14UNF
1X-12 UNF
1 -12 UNF
1%-12LNF
Number of upper teeth
Number of upper teeth
Nominal feed diameter
Nominal diameter
JB/T8824.1-1998
End of table)
1X-12 UNF
The applicable pattern, main thread angle, and cutting length of single and combined wire chains are given in the table. 3. 4
Single and combined
[Equal diameter] Shoe thread
(not)
Applicable pattern
First thick thread
Second thick thread
Main thread angle
5° 30r
Cutting female long doctor
JB/T8824.1—199B
3.5 The nominal double cutting angle of the wire silver is measured in the radial plane. The following are recommended: a) The front angle is r~10n
b) The local angle α is 4 centers
3.6 Marking example
Right-handed teeth are unified, the thread code is Na.5-40[INC, 40 teeth per 25.4mm, 2nd tolerance zone, single primary hoop (can be taper ! Concealed tap:
Hoop - thread grinding wire initial (bottom) 5-40UNC-2JB/T8824.11998 right fine thread unified thread, thread code 5/16-24UNF: 24 teeth per 25.4mm, two (initial taper and cancer chain) group equal diameter cutting wire:
unified end cut wire chain initial (bottom) S: 16-21UNEJB824.11998 right Sa phase tooth system · operation, climbing mother is 34-1DUNC , 10 teeth on 25.4Ⅲm, 3-grade public belt, three-piece unequal diameter waist taps:
Standard-thread grinding thread (unequal diameter) 3-3/4-10UNC-3JB/T8824.1-1998 left-hand coarse thread unified thread. The thread code is No.1-64UNC, 64 teeth on each 25.4mm, single medium taper cutting tap: Standard-screw knot tap No.1-64LNCLJB/TBB24.1..-1994 Thread tolerance of taps shall be in accordance with JB/TB824.2. 5 Technical conditions of taps shall be in accordance with B/8824.3. JE8824.1-1999 (Standard Appendix) Longer (short) size variation A1 Thread length/(short) size Output in Table A1 Table AE Screw code No.08D UNF
No,1-72 UNF
No.1-4UNC
Na2- LNF
Nu.2. 56 UNC
No.3-56 UNF
No.3-4 UNF
No.4-40 UNC
N$-44 UNF
No.5-40 UNC
No.6-4Q UNF
No.6-32 LNC
No.&-36UNF
No.8-32 LNC
No.10-24UNC
No.12-28 UNF
No.12-24 UNC
I/4-2 including LNF
1/4-20 L'NC
5/1624 UNF
5/16-1 UNC
/B-24 t'NF
3vB-E6 LNC
7/[620 LINF
6-14 [NC
Number of teeth per 25.4mm
International straight light company
Pitch P
Frequency length! | |tt | ||T/8-E4 UNF
T8-CUNO
1 -12 1INF
[X-I2UINE
IX -ING
1-12 LINF
1X -7 uNC
1X-E2 UNF
EA12 UNF
[-6LNC
IA-3 INC
2-4 X UNC
何25,4 m 1:牙故
JB.T 8874.1-1998
Table A1 (complete)
Nominal true diameter
28 575
Distance p
Black principal degree!
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