This standard specifies the types and dimensions of carbide straight shank machine reamers. This standard applies to carbide straight shank machine reamers with diameters greater than 5.3mm to 20mm. GB/T 4251-2004 Carbide straight shank machine reamers GB/T4251-2004 Standard download decompression password: www.bzxz.net

ICS 25. 100. 30
National Standard of the People's Republic of China
GB/T4251—2004
Generation B/T4251—1084
Machine reamers wlth parallel shanks with carbide tips2004-02-10 Release
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration
2004-0B-01 Implementation
This standard replaces 6B/T421684 hard pressing machine system as 2 standards and /T12.1-t96.1 specifications. The main changes are: B/T42512004-: The dimensions in Table 1 of CB/T42511S84: α-number of teeth and carbide insert model: - The size and size mark in Figure 1 of B/T4351-1!81 are cancelled, and the marking example is added; The mutual diameter tolerance of carbide shank machine reamer is added: rmf; The specification part "Diameter tolerance of machining H7.HS, H grade hole single point reamer" is added. This standard is a standard proposed by China Machinery Industry Federation. This standard is a standard proposed by China Machinery Industry Federation. The standard is approved by Henan First Tool Factory Co., Ltd. This standard is a standard replaced by the following standards: GE/T /251-196.1. 1 Scope This standard specifies the types and sizes of carbide straight shank machine reamers. This standard is applicable to carbide self-reamers with a diameter of .3umm to 2umm. 2 Normative references GH/T 4251- -2004
The following documents are the terms of this standard. They are dated references. All subsequent amendments (without errors or over-editions) are applicable to this standard. However, the parties who reach an agreement based on this standard may use the latest versions of these documents. H, are undated references. The latest edition is not applicable to this standard. G/42F (G/424-200 ISO22:3D GT3:4253 Hard alloy piece technology 3 Tolerances
3.1 Cutting part
For the standard force, the common value is m6. For the specific tolerance hole diameter, refer to B/4216. The design tolerance zone position is moved up by 0.05I- 0.15IT: Appendix A of this standard gives the tolerance of the internal diameter of the tool for grades 1I7, [!8, 119.
3.2 The tolerance of the internal diameter of the straight shank is:
3.3 The length tolerance is set according to the provisions of Table: Table 1 The length tolerance of the tool
Total length bzxZ.net
Type and size
The format of Figures 1 and 3
CB/T4251-2004
Based on the industry situation, the internal dimensions are not required to be used.
Table 2 The preferred dimensions
Unit is the maximum point diameter range
Marking example,
3 The dimensions divided by diameter
GH/T 4251-2004
Unit is meter
Diameter=10m, the classification code is 0, the straight shank machine tool with cemented carbide blade is: 1U-P20GB/T4251-2004. The classification code of the straight shank machine tool with a diameter of 1mm, such as the industrial grade precision hole, is: 10I17F20GB/T4251200.
Kun press carbide straight shank machine tool
6 Technical requirements
Technical conditions of cemented carbide straight machine tool are in accordance with TT23 regulations, GB/T4251-2004
*5. 7--5, 0
5, 3--1,
>13, . -15. 3
2-15. 3 ~ 23. 3
(Normative Appendix
Tolerance of the south diameter of the hard alloy straight shank edge for machining HH8, H grade holes. A.
China's certificate is to come
a, 247
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