BS 1486-2-1961.pdf
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1、BRITISH STANDARD BS 1486-2: 1961 Specification for Lubricating nipples Part 2: Heavy duty lubricating nipples Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1486-2:1961 This British Standard, having been approved by the Mechanical Engine
2、ering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 30 November 1961 BSI 10-1999 First published November 1948 First revision November 1961 The following BSI references relate to the work o
3、n this standard: Committee reference MEE/93 Draft for comment A(MEE) 1847 ISBN 0 580 35633 7 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government depar
4、tments and scientific and industrial organizations: Admiralty*Gas Council Air MinistryHigh Commission of India Associated Offices Technical CommitteeInstitute of Marine Engineers Association of Consulting EngineersInstitute of Petroleum (Incorporated)Institution of Civil Engineers British Chemical P
5、lant ManufacturersInstitution of Gas Engineers AssociationInstitution of Heating and Ventilating British Compressed Air SocietyEngineers British Electrical and Allied ManufacturersInstitution of Mechanical Engineers* AssociationInstitution of Mechanical Engineers British Engineers Association(Automo
6、bile Division)* British Gear Manufacturers AssociationInstitution of Production Engineers British Internal Combustion EngineLocomotive and Allied Manufacturers Manufacturers Association*Association of Great Britain* British Iron and Steel FederationMachine Tool Trades Association British Railways, T
7、he British TransportMinistry of Labour (Factory Inspectorate) CommissionMinistry of Power Crown Agents for Oversea Governments andMinistry of Transport AdministrationsMinistry of Works D.S.I.R.National Engineering LaboratoryNational Coal Board Electricity Council, The Generating BoardNational Physic
8、al Laboratory (D.S.I.R.) and the Area Boards in England and WalesRadio Industry Council Engineering Equipment Users AssociationWar Office* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly repr
9、esented on the committee entrusted, with the preparation of this standard: Ministry of Agriculture, Fisheries and FoodPublic Transport Association (Incorporated) Municipal Passenger Transport AssociationSociety of Motor Manufacturers * in18 UNF2A; ! inBSP.F Medium Ext. and ) in BSP.F Medium Ext. b)
10、Giant button head type threaded “ in20 UNF2A; * in18 UNF2A; ! inBSP.F Medium Ext. and ) in BSP.F Medium Ext. 2 Nipples a) Industrial button head nipples shall be in accordance with Figure 1 and Table 1. b) Giant button head nipples shall be in accordance with Figure 2 and Table 2. 3 Materials Indust
11、rial and giant button head nipples shall be manufactured from mild steel complying with BS 9701), EN 1A, or other free-cutting mild steel of an equivalent quality. The sealing face of the head shall be case hardened to a depth of 0.003 in to 0.005 in (0.080.13 mm). 4 Screw threads Details of screw t
12、hreads for attaching the nipples are given in Figure 1 and Figure 2 and Table 1 and Table 2. All threads shall be undercut at the shoulder in accordance with BS 19362) to the requirements of Form A2p, Grade 1. 5 Check valves The design of the nipples shall incorporate a spring loaded check valve whi
13、ch with its seat shall provide a seal against the ingress of dirt or other foreign matter, but shall admit lubricant and prevent its escape. The check valve shall be located at the surface of the nipple inlet head to reduce to a minimum the possibility of dirt collecting in the lubricant orifice. It
14、 is not intended that this valve should form a perfect seal against leakage under the pressure remaining in the bearing or lubricating passages after lubrication. If completely leak proof nipples are required or working pressures higher than normal (see the Appendix) are likely to be encountered in
15、lubrication, the construction of the nipple shall be the subject of agreement between purchaser and manufacturer. 6 Workmanship and finish Screw threads shall be cleanly formed and free from imperfections. The finished nipple shall be free from defects and shall be electroplated in accordance with B
16、S 17063). The coating shall be either cadmium, BS classification number Cd2, or zinc, BS classification number Zn2. 7 Marking The nipple shall, if threaded with a Unified screw thread, be marked with contiguous circles in accordance with BS 17684), The nipple or its container or package shall bear t
17、he following marking: The number of this British Standard “BS 1486-2”. The relevant type number of this British Standard (e.g., “U21A”, for industrial button head nipples threaded “ in20UNF2A). Manufacturers trade mark. 1) B.S. 970, “Wrought steels. En series”. 2) BS 1936, “Undercuts and runouts for
18、 screw threads”. 3) BS 1706, “Electroplated coatings of cadmium and zinc on iron and steel”. 4) BS 1768, “Unified precision hexagon bolts, screws and nuts (UNC and UNF threads)normal series”. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
19、S 1486-2:1961 2 BSI 10-1999 Figure 1 Industrial button head nipple Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1486-2:1961 BSI 10-19993 Table 1 Dimensions of industrial button head nipples Inches TypeABCDEFG H dia. J dia. K dia. L R r
20、adius r radius M valve open U21A“ in20UNF2A 0.500 max. 0.470 + 0 0.020 0.396 min. 0.688 + 0 0.008 0.127 + 0 0.004 0.100 + 0 0.004 0.450 min. 0.516 + 0 0.008 0.654 + 0 0.008 0.020 min. 0.050 min. 0.016 + 0.008 0 0.600 max. U21B* in18UNF2A 0.750 + 0 0.008 21A! in BSP.F Medium Ext.0.710 + 0 0.008 21B)
21、in BSP.F Medium Ext. Metric equivalents Millimetres TypeABCDEFGH dia.J dia.K dia.L R radius r radius M U21A“ in20UNF2A 12.70 11.9310.05 17.47 3.222.5411.43 13.1016.610.501.270.4015.24 U21B* in18UNF2A19.05 21A! in BSP.F Medium Ext. 18.03 21B) in BSP.F Medium Ext. Licensed Copy: sheffieldun sheffieldu
22、n, na, Fri Nov 24 06:08:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1486-2:1961 4 BSI 10-1999 Figure 2 Giant button head nipple Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1486-2:1961 BSI 10-19995 Table 2 Dimensions of giant butt
23、on head nipples Inches TypeABCEFGH dia.J dia.K dia.LR radius r radius U23A“ in20UNF2A0.500 max. 0.750 + 0 0.040 0.875 + 0 0.008 0.125 min. 0.125 + 0 0.010 0.660 min. 0.688 + 0 0.008 0.870 + 0 0.010 0.020 min. 0.075 min. 0.010 max. U23B* in18UNF2A 23A! in BSP.F Medium Ext.0.920 + 0 0.008 23B) in BSP.
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