This standard specifies the dimensions, appearance and surface roughness, materials, mechanical properties, mechanical properties test methods, marking and packaging specifications of fastening screws for countersunk indexable inserts (hereinafter referred to as screws). This standard applies to fastening screws for countersunk indexable inserts with thread codes of M2 to M8. JB/T 8363.2-1996 Technical Specifications for Fastening Screws for Countersunk Indexable Inserts JB/T8363.2-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 8363.2-96
Fastening screws for countersunk indexable inserts
Technical specification
Published on April 22, 1996
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1996
JB/T 8363.2.—96
This standard was proposed by the Technical Committee for Standardization of Cutting Tools, and the responsible unit for the drafting of this standard is Chengdu Tool Research Institute. The main drafters of this standard are Yu Jin, Yao Ti, Jia Zhangxue, and Qian. This standard was first issued on April 22, 1995 and came into effect on July 1, 1996. 1 Scope
Machinery Industry Standard of the People's Republic of China
Fasten Screws for Countersunk Indexable Inserts
Technical Specification
JB/T8363.2-96
This standard specifies the dimensions, appearance, surface roughness, materials, mechanical properties test methods, marking and packaging specifications of fastening screws for countersunk indexable inserts (hereinafter referred to as screws). This standard is applicable to fastening screws for countersunk indexable inserts with thread codes M2~M. 2 Cited Standards
The provisions contained in the following standards constitute the source documents of this standard through reference in this standard. When this standard is issued, the versions shown are valid: all standards will be revised. Parties using this standard should use the latest version of the following standards as soon as possible. GB19681
CB2516-81
3198.1-62
3Dx head diameter
Frequency nominal diameter!
Basic dimensions of fasteners Diameter 1~~600mm
Ordinary thread deviation table (diameter 1~355mm) Mechanical properties of fasteners Bolts, screws and studs Coaxiality tolerance of the hexagonal socket of the screw head to the axis of the threaded part: Coaxiality tolerance of the cylindrical head screw head to the threaded part axis Normal movable tolerance: Verticality tolerance of the cylindrical head screw bearing surface to the axis of the threaded part: Vertical tolerance of the female head end facing the threaded part 4 Dimensions
4.1 The basic dimensions of the threaded part shall be manufactured according to GB1S6, 4.Z The thread tolerances shall be manufactured according to 5g in GB2516, 4.3 The coaxiality difference of the hexagonal socket of the screw head to the axis of the threaded part shall be compared with Figure 1 and Table 1, as shown in
I! To show the reference position, the chamfer angle below the high head is within the range of Figure 1. Approved by the Ministry of Machinery Industry on April 22, 1996. Implemented on July 1, 1996. Code for cracking >M7--M5. 5. JR/T8363.2-96. The coaxiality tolerance of the head of the concave head screw to the axis of the effective axis and the normal runout tolerance of the threaded part of the rigid head screw bearing surface are 4.4. The center of the figure and Table 2 indicate that the basic position is within the range of the angle below the high head. Code for screws Ma~Ma. 5
4.5 The straightness tolerance of the threaded portion of the stud screw bearing and the perpendicularity tolerance of the threaded portion of the end face of the stud screw are shown in Section 3 and Table 3.
: 4 The following example shows the tolerance of the head of the stud screw bearing. In the example of the standard, Figure 3
>M4-M7. 5
No provisions
5 External gauge and surface roughness
JB/T 8363.2-96
5.1 The surface of the screw shall not have defects such as cracks, burrs, scratches and flash that affect the performance. 5.2 The surface of the screw shall not have folds. Except for the first two threads and the screw, there shall be no irregular teeth. 5.3 The upper limit of the surface roughness of the screw shall be in accordance with the following standards: bzxz.net
Screw bearing surface
Other surfaces
R.3.2um.
.1 The screw shall be made of 35CrMnSi or alloy with equivalent performance or above. The mechanical properties of the screw shall be 42~47HR. The lower limit of the mechanical properties of the screw shall be shown in this 4, Table 4
Other mechanical properties of the screw shall meet the 8.8 level specified in S0S8.1, or be negotiated by the supply and demand parties. 8 Mechanical properties test methods
8.1 Torsion test
Each batch of screws produced in batches should be subjected to a torsional load performance sampling test. 8.1.1 Test conditions
8.1.1.1 The test surface shall comply with the torque test requirements. 8.1.1.2 Number of samples: 5~B
8.1.1.3 Number of tests: 10 times for each sample. 8.1.1.4 Test method: as shown in the figure, insert the screw into the test plate and press the screw until the value exceeds the specified value. After that, the screw shall be tested and the screw head and hexagonal shape shall not be damaged and the original performance shall be maintained. If one piece does not meet the above requirements, the batch of screws shall be judged as unqualified in the torsion performance test. 9.2 Mechanical property test If there are special requirements for screws, other mechanical property tests can be carried out according to the test methods specified in GB3098.1 after consultation with the supplier. 9 Marking and packaging 9.1 Marking Label on the packaging tray or packaging: 1) Manufacturer's trademark: b) Product name: 2) Standard code and tolerance code for screws: (1) Number of this standard: e) Material brand, g) Expiration date, 9.2 Screws should be treated with anti-rust treatment before packaging. The packaging must be rust-proof and can prevent damage during transportation.
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