This standard specifies the basic requirements for the type, size and marking of unified thread nut taps (hereinafter referred to as nut taps). This standard is applicable to unified thread nut taps with thread codes No. 4 to No. 12, 1/4 to 2. JB/T 8824.4-1998 Unified thread nut taps JB/T8824.4-1998 Standard download decompression password: www.bzxz.net

[CS 25.I00.S0
Machinery Industry Standard of the People's Republic of China
JB/T 8824.41998
Nut taps for pnified threads
1998-12-29 Issued
National Bureau of Machinery Industry
1999-07-01 Implementation
JB/T8824.41998
This standard was first issued on December 29, 1998. At present, this standard was proposed and approved by the National Technical Committee for Equipment Standardization. The main drafting units of this standard are: Shanghai Standard Parts Tool Factory, Shanghai Listed Tool Factory. Model
Machinery Industry Standard of the People's Republic of China
Unified Threaded Nut Taps
Nnt taps for universal threads
JB/T8824.4-1998
This standard specifies the basic requirements for the type, size and marking of unified end nut taps (hereinafter referred to as tapped taps). This standard is applicable to the processing of unified threaded taps with end thread codes of Nu.4-Nu.12 and 1/4~2. Referenced Standards
The clauses contained in the following standards constitute the clauses of this standard by being cited in this standard. When this standard is published, all versions are valid. All standard parts are fixed. Parties using this standard should explore the possibility of using the latest versions of the following standards: JB/T8824.2-199B Standard - Thread Tolerances JB/T8824.3-1998 Standard Thread Technology 3 Types and Dimensions
3.] The thread type for nominal diameter d<6.350mm is as shown in Figure 1, and the dimensions are given in Tables 1 and 2. Figure 1
Comparison code
N.4 40UNG:
No.40 UNC
No.6-32 UNC
No.8-32UNC
No.10-24 LNC
Mo.12-2 1NG
Number of teeth per 25.4 mem
Nominal diameter
Note: The cutting dimensions in the table are recommended sizes. National Machinery Industry Network 1998-12-29 approved pitch
1999-07-01 implementation
baking effect code
No.6-40 UNF
No-361NF
No.10-32 LNF
No.1228 CNF
every 25.4mm
1 number of teeth
nominal diameter
code: the length of the cut tide male is the only existing size. JB/T BB24.4—19
3,2 nominal diameter d26.350-25.4mm round handle (no head) female wire male plate as shown in Figure 2. The sizes are given in Table 3 and Table 4. Thread code 1/420 LNC 5/16~15 UNC 3/B-16 LNC 7/16-14NG 9/16-12UNC 3/4-10UNC 7/8-9TINC Number of upper teeth Nominal diameter 22 225 Note: The cutting length in the table is the recommended size. 2
Effective code
1/4-28 UNE
5/16-24 UNF
7/16-20NF
9/161 UNP
3/4-IG UNF
7/8-141NF
[--12 UNF
Number of teeth per 25.1mm
Male diameter
Note: The cut male length and are recommended sizes in the table. JB/T 8824.4—1998
3.3 The thread type of the nut with a nominal diameter of 36.350mm and a square head is shown in Figure 3, and the size is given in Tables 5 and 6. Figure 3
Thread code
14-20 UNCbzxz.net
S/16-1BUNC
3/B16 LNC
7/16-14 LNC
1/2-13 LNC
56-12 NC
5/B-IUNC
Upper tooth
Nominal point diameter
Hose number
3/4-10UNC
7/8-9LNC
1-8UNC
1%~UNC
1 X -7 LINC
IK 6uNC
1-5UNC
2-4 X UNC
Upper tooth maximum
Nominal diameter
The length of cutting is the recommended size in the table. Density:
Frequency code
1/4-28UNP
3/1624 UNF
3/824 UNF
7/16-20INF
1/2-20 UNF
/161 UNF
S/-8LNE
3/416LINF
T.8-14 UNF
1-12UNF
1X-12 UF
1A-I2 UNF
-12 UNF
1-12 UNF
Number of upper teeth
Nominal diameter
Note: The length of the cut-out in the table is the recommended size. JB/T8824.4—1998
Table 5 (end)
1.4Number of nut thread with nominal diameter of 7.93%mm can be made into external point. 68
JB/T8824.4—1998
3.5The nominal cutting angle of these tapers, measured in the radial plane, is as follows:8) Rake angle is 8~10%:
b) Back angle is 0%, which is 48-6°.
3.6Marking example
Stone coarse thread unified thread, the thread effect code is 3/8~16UNC. Every 25.4mm is 16 teeth, 2nd grade tolerance belt grinding tap: unified thread nut tap 3/8-16UNC-2JB/T8824.4-199 right can be fine thread unified thread, thread effect code is 5/16-24 UNF, 24 teeth per 25.4mm, thread size: 5/16-24UNFJB/T8824.4--1998 left-hand coarse thread, thread size code is 1/2-13UNC, 13 teeth per 25.4mm, 5-grade tolerance band grinding thread: 1/2-13UNCL-3JB/T8824.4-199S Note: Nominal diameter: d6.350-25.4mm, the shank has two types of pins: square head and weak head (round head). In the case of needing to clearly specify the specification, the word "round head" should be added before the name of the nut without square head, and the thread tolerance is in accordance with 8824.2.
5 Technical specifications
Silk fiber technical conditions shall comply with JB/T8824.3.
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