1、- BSI BS*4b: PART*3 51 1624bb9 0207793 2 BRITISH STANDARD 46 : Part 3 : 1951 UDC 621.886.7 : 669.14 SOLID AND SPLIT TAPER PINS BRITISH STANDARDS INSTITUTION BSI BSS4b: PARTS3 51 m 1624bb9 0207794 4 BRITISH STANDARD SPECIFICATION SOLID AND SPLIT TAPER PINS B.S. 46 :Part 3 : 1951 incorporating amendme
2、nt issued November, 1959 Obsolescence * Obsoiescent (by Aniendinent No. 2). Wie need for the product covered by this British Standard lias been reviewed and it has been decided that, in the interests of rationalization, it should be regarded as obsolescent and not therefore used for new designs. The
3、 standard will be withdrawn in due course. BRITISH STANDARDS INSTITUTION Incorporated by Royal Charier 2 PARK STREET, LONDON, W I A 2BS Telex: 266933 . Telephone: 01-629 9000 B.S. 46 : Part 3 : 1951 THIS BRITISH STANDARD, having been approved by the Mechanical Engineering Industry Standards Committe
4、e and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 20th December, 1951. First published November, 1929. First revision January, 1935. Second revision December, 1951. The Institution desires to call attention to the fact t
5、hat this British Standard does not purport to include all the necessary provisions of a contract. In order to keep abreast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notic
6、e of the committees charged with the revision of the standards to which they refer. A complete list of British Standards, numbering over 9,000. fully indexed and with a note of the contents of each, will be found in the BSI Catalogue which may be purchased from BSI Sales Department. The Catalogue ma
7、y be consulted in many public libraries and similar institutions. This standard makes reference to the following British Standards :- B.S. 122. Milling cutters and reamers. B.S. 240 : Part 1. Methods and tables for Brinell hardness testing. B.S. 970. Wrought steels. British Standards are revised, wh
8、en necessary, by the issue eiiher of amendment slips or of revised editions. It is important that users of British Standards should ascertain that they are in possession of the latest amendments or edition. MEEi4 2 BSI BS*4b: PART%3 51 I 162Ybb9 0207795 b I B.S. 46 : Part 3 : 1951 CO-OPERATING ORGAN
9、IZATIONS The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations:- Air Ministry Associated Offices Technical Cornmittee Assoc
10、iation of Consulting Engineers (Incorporated) British Chemical Plant Manufacturers Association British Compressed Air Society Admiralty *British Electrical for suitable reamers, reference should be made to B.S. 122, Milling cutters and reamers . It is strongly recommended that, in future, only fract
11、ional size pins be used, To facilitate the selection of suitable drill sizes, details of the minimum and maximum diameters, calculated in relation to the permissible diametral longitudinal and taper tolerances, have been included in Appendix A. I SPECIFICATION GENERAL i. The pins shall be of one of
12、the four classes A, B, C or D, as may be ordered by the purchaser. The pins shall be made from the relevant material specified in Clause 2, shall comply with the mechanical tests specified in Clauses 6 and 7, and shall conform to the dimensions and tolerances specified in Clauses 4 dnd 5 and Tables
13、2 and 3, NOTE. The following guidance is given to enable users to select the most suitable class of pin :- Class A (mild steel) pins are intended for use in the majority of general engineering applications. 4 B.S. 46 : Part 3 : 1951 Class B (mild steel) pins are higher grade pins intended for use in
14、 special Class C (high tensile steel pins) are intended for applications involving high Class D (stainless steel) pins. applications, stresses or where the parts are subject to shock. MATERIAL 2. a, (i) Class A pins, Class A pins shall be manufactured from bars conforming to specification En. lA, Fr
15、ee cutting steel bars for machining . * (ii) Class B pins. Class B pins shall be manufactured from bars conforming to specification En. 3A, 20 Carbon steel (hot roiled or normalized) or specification En. 3B, 20 Carbon steel (cold drawn) .* (iii) Class C pins. Class C pins shall be manufactured from
16、heat- treated steel bars conforming to. specification En. - 16 (Condition T), Manganese molybdenum steel . * (iv) Class D pins. Class D pins shall be manufactured from heat- treated steel bars conforming to specification En. 57, High tensile chromium-nickel rust resisting steel . * b. Tests for chem
17、ical composition and mechanical properties. if, to confirm their compliance with the appropriate specification in B.S. 970*, the purchaser requires the taper pins to be tested for chemical composition or mechanical properties (other than Brinell hardness or bend tests) he shall state this in his enq
18、uiry and order. 3. a. All pins shall be supplied in a bright condition and shall be free from rough edges, cracks and other defects. Any small pip resulting from a parting-off operation shall not be considered a defect. b. The large end of both solid and split taper pins shall be domed or, at the op
19、tion of the manufacturer, may be in the form of a truncated cone (see Fig. 7). c. The small end of solid taper pins shall be machined, but may be of any suitable form, at the option of the manufacturer. d. The small end of split taper pins may be plain, dimpled or slotted, at the option of the manuf
20、acturer. e. Split taper pins shall be split, not sawn (see Clause 5 (4). MANUFACTURE DIMENSIONS 4. a. Solid and split taper pins shall conform to the dimensions given in Tables 2 and 3. b. The nominal size of a solid or split taper pin shall be the nominal fractional diameter at the large end. * B.S
21、. 970, Wrought steels . 5 BSI BS*4b: PARTr3 51 = 1624bb9 0207798 1 = Class of pin Aandi.3 -_. C and D B.S. 46 : Part 3 : 195t TYP? Minimum Brine11 of pin hardness number . Solid Split Solid and split 1 248 - -:- c. The taper shall be 1 in 48 (%*in. per foot or 0.0208 in. per inch), on diameter. LIMI
22、TS OF TOLERANCE ON DIMENSIONS 5. a. Large diameter. For nominal sizes up to and including 1/32 in. $- O*OOO in. - 0.002 in. For nominal sizes % in. and above + 0.000 in. - 0.004 in. b. Lengths. Up to and including 2 in, =t: 0.015 in, Above 2 in. up to and including 6 in. “al 10.2188 0.216 8 0.246 O
23、0.277 2 - 0.308 5 0.371 O 0,433 5 0.496 O - 0.621 O - Ti 10.7500 0.746 O 0.871 O - I/a i 0.875 O il NOTE. Drills ami rcaizters. The holes for lhe pins shown to the left of the heavy line can be produced in one operation by the use of the taper pin reamers listed in B.S. 122. hilling ciittcrs and rea
24、mers. Drills for taper pins are also available over the same range. 11 BSI BS*4b: PART*3 51 1624669 0207804 3 = B,S. 46 : Part 3 : 1951 - TABLE 3. DIMENSIONS OF SOLID AND SPLIT TAPER PINS (NON-PREFERRED SIZES) (All dimensions are given in inches) I Diameter at large end D I Standard !eogihs ( L) (So
25、lid taper pins shoim 3s O . Split laper pins shown as 0 ) 13 BSI BS*4b: PART*3 51 lb24bbi 0207805 5 B.S. 46 : Part 3 : 1951 APPENDIX A SOLID AND SPLIT TAPER PINS MAXIMUM AND MINIMUM DIAMETERS AT SMALL END (PREFERRED SIZES ONLY) (see Table 2) The details of maximum and minimum diameters given in Tabl
26、e 4 are included to facilitate the selection of suitable drill sizes. AU the permissible limits of tolerance on the diameter of the large end, on the length and on the taper have been taken into account and the figures have been based on the follwing formulae :- P fin.= D min. - (L max. x T max.). P
27、 max. = P min. + (Di + 0.001 L min. + 0.0213 Lt). where : D = Diameter at large end. P = Diameter at small end. L =Length. T max. = Max. taper (0.0213 in. per inch). Di = Total tolerance on diameter. Li = Total tolerance on length. When selecting a drill size suitable for a particular application, a
28、llowance may be required for projection (overhang) of the point, this being of particular importance in the case of split taper pins. Generally speaking, any projection may be obtained by adding to the diameter given in Table 4 an amount equal to one-fiftieth of that projection. 14 iBSI BS*4b: PART*
29、3 51 m 1b24bb ! I l I l -T - I -i 9N mt- t 4 i -i- l -. $1 Orl 38 O0 _- .i d S:z x x Is B.S. 46 : Part 3 : 1951 APPENDIX B COMPARISON OF BMTISH STANDARD FRACTIONAL SIZE TAPER PINS AND NUMBER SIZE TAPER PINS Reference to the sizes of taper pins by means of whole numbers is not in accordance with Brit
30、ish Standard procedure, and it is recommended that new designs be referred to in British Standard fractional sizes. The following comparative table is given to facilitate a change to standard sizles :- Nmhr series No. O 1 2 3 4 5 - 6 7 8 - - 10 Nominal diuneter at large end in. 0.062 5 0.078 O 0.094
31、 o 0.109 o 0.125 o 0-141 O 0.156 O 0.172 O 0.193 O 0.219 O 0.250 o 0.289 o 0.341 O 0409 o 0.492 O - - - 0.591 O L 0.706 O - - 0.860 o - Britieh Standnrd des Nominal diameter at huge end in. 0.062 5 0.078 1 0.093 8 0-109 4 0-125 o 0.140 6 0.156 2 0-171 9 0.187 5 0.218 8 0.250 o 0.281 2 0.312 5 0.343
32、8 0.375 O 0.406 2 0.437 5 0.500 O 0.562 5 0.625 O 0687 5 0.750 O 0.812 5 0.875 O - - I 8605 -4-0.2k-B BSI BS*46: PART*3 53 W 3hZ4L69 0236243 19 AMD $126 Aneiidiiieiit No. 2 publislied aiid effective from 30 November P 982 to BS 46 : Part 3 : 1951 ,SOM aid split taper pins Obsolescence Insert the fol
33、lowing paragraph before clause i : Obsolescent (by Amendment No. 2). The need for the product covered by this British Standard has been reviewed and it has been decided that, in the interests of rationalization, it should be regarded as obsolescent and not therefore used for new designs. Tlie standard will be withdrawn in due course. I 8211-1.3k-B MEE/6(
