1、BRITISH STANDARD BS 4185-13: 1985 Machine tool components Part 13: Specification for dimensions of counterbored holes UDC 621.9:621.882.215.6 422.6 181BS4185-13:1985 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published undert
2、he authority of the BoardofBSI and comes intoeffecton 30 April 1985 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference MTE/1 (formerly MEE/6) Draft for comment 83/78543 DC ISBN 0 580 14439 9 Committees responsible for this British Standard The preparati
3、on of this British Standard was entrusted by the Mechanical Engineering Standards Committee (MEE/-) to Technical Committee MEE/6 upon which the following bodies were represented: Department of Industry (Mechanical Engineering) Federation of British Engineers Tool Manufacturers GAMBICA (BEAMA) Health
4、 and Safety Executive Institution of Production Engineers Machine Tool Industry Research Association Ministry of Defence University of Aston in Birmingham University of Manchester, Institute of Science and Technology Coopted members Amendments issued since publication Amd. No. Date of issue Comments
5、BS4185-13:1985 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Dimensions 1 Figure 1 Counterbored hole with hexagon socket head cap screw showninposition 1 Table 1 Dimensions of counterbored holes 1 Publications referred to Inside back coverBS4185-13:198
6、5 ii BSI 07-1999 Foreword This Part of BS 4185 has been prepared under the direction of the Mechanical Engineering Standards Committee and is based upon a draft submitted by the Machine Tool Industry Research Association. In formulating the standard, rationalization of the possible sizes of counterb
7、ored hole has been made in order to keep the variety of counterboring tools to a minimum. Clearance hole diameters are taken from the medium fit series of BS 4186 except for sizes M12 and M16. For these, diameters have been selected from the close fit series in order to provide less clearance around
8、 the screw and a greater bearing surface under the cap head. With the exception of hole sizes M2.5 and M30 which will require counterboring tools with a special pilot diameter, and sizes M5, M8, M10, M20, M24 and also M30 which will require tools with special cutting diameters, the standard is inten
9、ded for use with counterbores selected from BS 328-5. Alternatively, sub-land drills may be used to form the counterbore and clearance hole in one operation. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for thei
10、r correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see
11、 copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4185-13:1985 BSI 07-1999 1 1 Scope This Part of BS 4185 specifies dimensions of counterbored holes for use with hexagon socket head cap screws complying with the requi
12、rements of BS 4168-1 of sizes ranging from M2.5 to M30. NOTEThe titles of publications referred to in this standard are listed on the inside back cover. 2 Dimensions Dimensions of counterbored holes shall be as given in Table 1. Table 1 Dimensions of counterbored holes (see Figure 1) Figure 1 Counte
13、rbored hole with hexagon socket head cap screw shown in position Size of cap screw selected from BS 4168-1 Counterbore Clearance hole Nominal clearance on cap screw head (for reference) Diameter d 1 tol H13 Depth h tolmm Diameter d 2 mm mm mm mm M2.5 M3 M4 M5 M6 M8 M10 M12 M16 M20 M24 M30 5.0 6.0 8.
14、0 9.5 11.0 14.0 17.0 20.0 26.0 32.0 38.0 48.0 2.8 3.5 4.5 5.5 6.5 8.5 10.5 13.0 17.0 21.0 25.0 31.0 2.9 3.4 4.5 5.5 6.6 9.0 11.0 13.0 17.0 22.0 26.0 33.0 0.5 0.5 1.0 1.0 1.0 1.0 2.0 2.0 2.0 2.0 2.0 3.0 See BS 4500-1.0.2 + 0 2 blankBS4185-13:1985 BSI 07-1999 Publications referred to BS 328, Drills an
15、d reamers. BS 328-5, Specification for the dimensions of countersinks and counterbores 1) . BS 4168, Hexagon socket screws and wrench keys: metric series. BS 4168-1, Specification for hexagon socket head cap screws. BS 4186, Specification for clearance holes for metric bolts and screws 1) . BS 4500,
16、 ISO limits and fits. BS 4500-1, General, tolerances and deviations. 1) Referred to in the foreword only.BS 4185-13: 1985 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view o
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