This standard specifies the dimensions of 60°, 90°, 120° straight shank conical countersinks. This standard only specifies metric dimensions. For countersinks with cutting diameters of 8mm to 25mm, only metric dimensions will be recommended in the future. These dimensions are only applicable to high-speed steel tools, but production allows the shank to be replaced with a suitable material, such as carbon steel. GB/T 4258-2004 60°, 90°, 120° straight shank conical countersinks GB/T4258-2004 Standard download decompression password: www.bzxz.net

GB/T 4258—2004/ISO 3294,1975 This standard is equivalent to ISO 3294:17750\, ISO 3294:130\. For the convenience of use, this standard has made the following editorial adjustments: ... "decimal point" is used as the digit sign, ""; "this standard" is used instead of "this international standard"; except for the foreword of the international note, in the referenced documents of the normative document, add the introductory words: 1S) 3233 This standard is replaced by GB/T 1143. From the month of implementation, it will replace CB/T 4258. —1584960\00°.120\straight tree paving surface This standard has the following changes compared with GB/14233—1984: The footmarks of the symbols \\ and "\" in Table 1 have been adjusted, the angle symbol has been changed to "\", and the corresponding changes have been made in Table 1. The provisions on the compensation deviation of the cut diameter, total length and body length have been cancelled, and the provisions on the number of teeth have been cancelled; the diameter of the small end has been changed from equal dimensions to stop dimensions: the surface rent has been listed in the technical parts standard; the system of indication has been cancelled:
The use of the relevant technical parts has been cancelled.
This standard was proposed by the China Machinery Industry Federation and the standard was jointly managed by the National Technical Committee for Standardization. The drafting unit of this standard is the Institute of Tools and Equipment, which is the main drafter of this standard. This standard represents the previous release of the standards, GR/T48—1934
1 Scope
GB/T 4258—2C04/1SO3294.1975 60°90°120° straight shank taper hook drill
The standard specifies the size of 65", 90°, 120\ straight shank taper drill. This standard only specifies the metric size. For the 8mm to 2mm diameter rust new, only the metric size is recommended. These sizes are only suitable for high-pressure adjustment tools. In production, the shank is made of a combination of materials and steel. Unless otherwise specified, the shank is made of steel. The British shank taper is in GB/T1143:2 Normative reference documents
The following documents are used as the terms of this standard through the production standard. All the parts that can be used during the production period are subject to the following revisions. The amendments (excluding the contents of the dated errors) or revisions are not applicable to this standard. The parties concerned shall study whether the latest versions of these documents can be used according to the validity of the standard. The latest versions of the referenced documents without the date of the amendments are applicable to this standard. GH/11436u012 Standard Taper Handle Dimensional Drill (U1143-2004.1S03233:197=.11T) 3 Dance and size
type see figure: size table]
=5c*,9 or 125 (: 1) Www.bzxZ.net
The fiber structure of the end of the nominal diameter
is not specified.
53cheng12℃\
arrow with length
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