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BSI also holds the copyright, in the UK, of | | the publications of the international standardization bodies. Except as permitted | under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, | stored in a retrieval system or transmitted in any form or by any means 177。 BSI 091999 Page 13 EN 8183:1999 Annex C (informative) Designation system for chain (medium tolerance) — Grade 4 General format EN 8183 4 10 30 EN and part(s) number block Grade of chain Size of chain Annex ZA (informative) Relationship of this European Standard with EU Directives This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports the essential requirements of EU Directives: Machinery Directive 89/392/EEC。 p 400 dn 2 min 1 000 BFmin = 0,628 318 5dn2 where BFmin is the minimum breaking force, in kilonewtons. The values given in Table 5, column 4 have been rounded to the nearest 0,1 kN up to 100 kN. Values equal to or greater than 100 kN up to 1 000 kN are rounded to the nearest 1 kN, and values of 1 000 kN or greater are rounded to the nearest 10 kN. 169。 G is the acceleration due to gravity (9,806 65 m/s2). The values given in Table 5, column 2 are from the R40 series of preferred numbers and represent the nearest lower R40 value relative to the full calculated value of WLL. Calculated values of manufacturing proof force (MPF) The values of the manufacturing proof force are based on the full calculated MPF values determined using the following formula: MPF 2 188。 BSI 091999 Page 11 EN 8183:1999 Calculated values of working load limit (WLL) The values of the working load limit are based on the full calculated WLL values determined using the following formula: WLL 2 188。 b) mean stress at the manufacturing proof force (MPF) = 200 N/mm2。 b) 177。 BSI 091999 Page 10 EN 8183:1999 Bend deflection acceptance criteria On pletion of the bend test the requirements of shall be met. 7 Marking Marking shall be as specified in EN 8181. The grade mark for the chain shall be “4”. 8 Manufacturer’s certificate The manufacturer’s certificate shall be as specified in EN 8181. 9 Instructions for use Instructions for use shall acpany the chain and shall be in accordance with the relevant clauses of prEN 8186. Annex A (informative) Calculation of dimensions, working load limits and mechanical properties Dimensions and tolerances In Table 2, column 2, the toleranc