This standard specifies the dimensions and tolerances of Morse taper shank 90° conical countersinks with replaceable guide pins. GB/T 4264-2004 Morse taper shank 90° conical countersinks with replaceable guide pins GB/T4264-2004 Standard download decompression password: www.bzxz.net

ICS 25. 100. 30
National Standard of the People's Republic of China
GB/T4264-2004
Replaces GB/T4264—1984
Countersinks, 9o°, with Morse taper shanks and detachable pilots (ISO4204:1977, MOD)
Issued on 2004-02-10
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2004-08-01
GB/T4264—2004
This standard modifies and adopts ISO4204:1977 "Countersinks, 90°, with Morse taper shanks and detachable pilots" (English version). Compared with ISO4204:1977, this standard has the following technical differences and editorial modifications: In the normative reference documents, ISO296 and ISO4208 are replaced by GB/T1443 and GB/T4266 respectively; ISO4207 is deleted; Appendix A (common series of strontium drills with 90° taper shanks) is added; the tolerance chapter is cancelled, and the dimensional tolerances are listed in the table; marking examples are added; the symbol "." is used to replace the comma "," as a decimal point; "this standard" is used to replace "this international standard"; the foreword of the international standard is deleted; in Table 1, the diameter d: 31.5~40 is changed to 31.5~~40.4. This standard replaces GB/T4264-1984 "90° taper drills with replaceable guide pins" from the date of implementation. Compared with GB/T4264-1984, this standard has the following changes: the writing format is in accordance with GB/T1.1-2000;
In Figure 1: the footnotes of the symbols "d" and "{" have been adjusted, and corresponding changes have been made in Table 1; Table 1 is the same as ISO4204, and the strontium drill code in GB/T4264-1984 has been deleted; the cutting diameter di and the guide pin diameter dz are given in range segments. Commonly used cutting diameters, guide pin diameters and applicable screw and bolt specifications are listed in the appendix, and the dimensions are adjusted in accordance with GB/T152.2-1988;
-Surface roughness is listed in the technical conditions standard; Appendix A (common series of Morse taper shank 90° cone drills) is added. Appendix A of this standard is an informative appendix. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Tool Standardization. The drafting unit of this standard: Chengdu Tool Research Institute. The main drafters of this standard: Shen Shichang and Nie Kexing. Previous publications of the standards replaced by this standard: -GB/T4264—1984.
Strontium drill with Morse taper shank and replaceable guide pin, 90° cone This standard specifies the dimensions and tolerances of strontium drill with Morse taper shank and replaceable guide pin, 90° cone. 2 Normative references
GB/T4264—2004
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T1443 Self-clamping taper for machine tool and tool handles (GB/T1443-1996, eqvISO296:1991) GB/T4265
Technical conditions for 90° taper strontium drills with guide pins
GB/T4266 Replaceable guide pins for drills (GB/T4266-2004, ISO4208:1977MOD) 3 Dimensions
3.1 Dimensions and tolerances
The type dimensions and tolerances of drills are as shown in Figure 1 and Table 1. Figure 1 only illustrates the diagram of this standard and is not used as a design detail drawing. The dimensions and tolerances of Morse taper shanks shall comply with the provisions of GB/T1443, and the dimensions of guide pins shall comply with the provisions of GB/T4266. 5
-Morse taper shank
Cut diameter
Guide post diameter
Unit: mmWww.bzxZ.net
Mohs circle
GB/T4264--2004
2 Marking example
Diameter d, 24.4mm, guide post diameter d2=13.5mm with replaceable guide post, taper shank 90° cone surface strontium drill: Morse taper shank 90° cone surface drill 24.4×13.55GB/T4264—2004
Technical conditions
Technical conditions of Morse taper shank 90° cone surface strontium drill with replaceable guide post shall be in accordance with the provisions of GB/T4265 2
Appendix A
(Informative Appendix)
Common series of Morse taper shank 90° cone surface strontium drill GB/T 4264—2004
Table A.1 gives the cutting diameter, guide post diameter and applicable screw or bolt specifications of commonly used Morse taper shank 90° cone strontium drills. These sizes of strontium drills are suitable for machining countersunk seats in accordance with GB/T152.2-1988 "Countersunk holes for fastener countersunk heads". Table A.1
Cutting diameter
Guide post diameter
Unit: mm
Applicable screw or bolt specifications
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.