This standard specifies the basic requirements for the type, size, marking and packaging of long-shank nut taps (hereinafter referred to as taps). This standard is applicable to taps used for machining ordinary threads (GB 192～193-81, GB 196～197-81). JB/T 8786-1998 Long-shank nut taps JB/T8786-1998 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T8786—1998
Long Shank Nut Taps
Published on 19980717
National Bureau of Machinery Industry
Implementation on 1998-12-01
JB/T8786:1998
This standard will replace GB3465-83 Long Shank Nut Taps from the month of its entry into force. This standard is proposed by the Standardization Technical Committee of the State Council and is under the jurisdiction of the drafting unit of this standard: Chengdu Chengquan Group Co., Ltd. The main drafter of this standard is Ran Zhenyu.
This standard was first issued on January 19, 1983. Scope
China Mechanical Industry Standard
Long handle nut taps
Lopgyruanknuttaps
JB/T 87861998
#GE346683
This standard specifies the basic requirements for the type, size, marking and package of long handle nut taps (hereinafter referred to as nut taps). This standard applies to the processing of ordinary nut taps (G193~193-81.G196~197-81). 2 Reference Standards
The meanings contained in the following standards become the text of this standard through reference in this standard. The versions shown in this standard are valid. All standards will be revised. Parties using these standards should explore the feasibility of using the latest versions of the following standards: GS1$21
GT1S-H
GR ISt. 8:
+3 157-8.
GB/TSS
3 Types and dimensions
Tube thread basic thread type
Ordinary thread
True diameter and pitch series (from diameter 1~600mm) basic size (diameter [~60mm)
Tube thread
Ordinary thread relative tolerance and matching diameter! 35t) External number tolerance
3.1 The actual size of the screw shall comply with the provisions of Table 1 and Table 2. 3.2 The screw with a nominal diameter of + equal to 1℃mm can be made into an external top type. 3.3 The recommended dimensions in Table 1.
Approved by the State Machinery Industry Bureau on July 17, 1998 [998-12:-11 implementation
Diameter of the public
Transport number: ten with large month,
JB/T8786—1998bzxZ.net
Coarse tooth general thread original tap
Thread type thread push
1:, uo
YA.4XE.35
.mrxc .
I M9 : c. 75
: MI× 5. 15
[2× 1. 25
N14x 1. 5
Mt4 * 1. 25
: M14x1
MI5× 1. 5
Nominal diameter
JB/TB786—199B
2Fine pitch ordinary thread pure increase
M22×2
M24×1
M22×2
M27×1
M28×2
M28×1. 5
M3uxI-
1M32X?
Nominal diameter
JB/T87861999
Table continued)
270326
28. mi 22 4m
M40>:1. 5
:M50x 1. 5
Public direct record
1,
?: Model is for rent, some resistance, long dust collector push JB/T8786-1998
Table 2 (end)
28.c22. 0
Marking example
JB/T 8786--1998
a) Ordinary thread diameter 12rm, pitch 1.75mm, [type, F2 tolerance band tap M12-H2-1B/B7861998
b) Fine thread ordinary thread diameter 12mm, pitch 1.5mm, type 1.H1 tolerance band tap: Long shank thread single thread chain M12X1.i-111-1JB/T7G-199 Note, the thread number should be after the end thread number, such as 121, its name you remember: or the same as 5 threads, but the nominal cutting angle
thread deviation nominal cutting system turning diameter inside the disk, recommended as follows: a) Rake angle rr~10\
b Back angle er 4°-~h\
6 Technical requirements
The surface of the wire shall not have cracks, marks, rust, grinding burns and other defects that affect the performance. The connection between the front and edge of the taper shall be 6.1
The maximum deviation of the threaded part of the wire shall be in accordance with the provisions of Table 3. 6.2
Table R tap thread length deviation
Nominal diameter
2-5. 5 ~12
The effective length shall be in accordance with the provisions of Table 4.
Table wire surface roughness
National you teach shop
|Screw surface
|Help Lang Yi Gang
Transformer surface
Wire fiber cracking tolerance shall be determined according to GR.
High-speed judgment
Media effect long seat "public relations
Alloy products
6.5 The nominal diameter is equal to or greater than emm, and the thread (middle diameter and diameter) must be ground. The thread should be made into a reverse part: H1 rolling thread does not produce side
6.6 The middle diameter detection part of the thread is moved 1~2 teeth before cutting. (.T thread urges the remaining dimensions of the tolerances according to the provisions of Table 5. G
Also after the implementation
JB/T 8786-1998
The remaining size tolerances of the screw thread are as shown in the table. The cutting surface of the tap part shall be adjusted according to the requirements of the table. The radial surface of the part shall be adjusted according to the requirements of the table. 6.9 The screw thread should be made of M5Cr4V2 and other materials. 1T1 The screw thread can be made of 9SiCrT 12A wear E learning and other brands of tool steel, carbon fiber tool manufacturing. If the fiber can be made of similar joints, its structure is made of 45 steel or above performance steel village road
pure fiber burst part of the quality of the sleep according to the US regulations. Performance characteristics of the grain
cup gram air
silk male 5 head hardness science low IIRC.
7 Marking and packaging
7.1 The final mark should be: || tt||) Manufacturer's trademark
b) Screw effect code:
e) Wire chain belt code I is allowed to be traced
Special metal engineer steel wire
Carbon and judgment control
d) Material ratio number (wire made with high-quality steel fiber marking \HS\, wire made with alloy processing or case processing can be marked without marking).
Three: The production department directly insisted on small Uu leaves, the amount of the account is RMB 100,000. Gas size, mesh \\ can also be unmarked, T.2 Packing point three should remember:
Manufacturer! Name address, front:
b) Wire identification mark example current fixed% memory;
Material brand or code:
dNet number:
) year,.
JB/T87861998
Wire who before packaging into anti-rust treatment packaging semi-solid reliable, open can prevent transportation is a small test
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