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1、BRITISH STANDARD CONFIRMED APRIL 1998 BS SP 118:1958 Incorporating Amendment No. 1 Tie rods (unified threads) For aircraft UDC 624.071.3:621.882.082.3:629.13 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS S
2、P 118:1958 This British Standard, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council of the Institution on 31 March 1958 BSI 02-2000 The following BSI reference
3、s relate to the work on this standard: Committee reference ACE/14 Draft for comment CT(ACE)8987 ISBN 0 580 34417 7 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Br
4、itish 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, pages 1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This w
5、ill be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments 5090November 1963 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006,
6、Uncontrolled Copy, (c) BSI BS SP 118:1958 BSI 02-2000i Contents Page 1Scope1 2Material and manufacture1 3Dimensions1 4Screw threads1 5Finish1 6Freedom from defects1 7Identification and marking1 8Tests1 Appendix4 Figure 12 Table 1 Dimensions and code letters of the rods (UNF threads)2 Table 2 Toleran
7、ces on dimension C3 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006, Uncontrolled Copy, (c)
8、 BSI BS SP 118:1958 BSI 02-20001 1 Scope This British Standard specifies the materials, dimensions and finish of tie rods with Unified threads for aircraft. NOTEThe figures in British units are to be regarded as the standard. A table is given in the Appendix to provide a ready means of calculating t
9、he approximate millimetre equivalents of the inch dimensions. More accurate conversions should be based on the tables in BS 350. 2 Material and manufacture a) Each tie rod shall be made from one piece of material only. b) The tie rods shall be manufactured from material complying with the requiremen
10、ts of the latest issue of Ministry of Supply aircraft material specification D.T.D. 5032, Carbon steel (suitable for the manufacture of tie rods). The material shall be subject to cold work over the reduced portion of the rods during the process of manufacture to achieve the mechanical properties li
11、sted in Table 1. c) The material used for the manufacture of the tie rods shall be ground after cutting and straightening to eliminate surface decarbonization. d) The tie rods shall be free from twists and waves; the reduced portion shall be concentric with the ends. 3 Dimensions The overall length
12、of the tie rods shall be as specified on the order (see Clause 7) and other dimensions shall conform to the dimensions and tolerances specified in Table 1 and Table 2 4 Screw threads The screw threads shall be rolled and shall conform to the Class 2A limits and tolerances specified in the latest edi
13、tion of BS 1580, “Unified screw threads”. The screw threads shall be required to pass gauges approved by the Inspecting Authority. 5 Finish The tie rods shall be cadmium plated in accordance with the latest issue of Ministry of Supply aircraft process specification D.T.D. 904. 6 Freedom from defects
14、 a) The rods shall be free from harmful defects. b) Rods may be rejected at any time for faults in, or revealed by, manufacture, although they have been made from material passed previously for chemical composition and mechanical properties. 7 Identification and marking a) All tie rods shall have th
15、e appropriate code letter and an indication of length see Clause 7 b) marked on the portion of the rod between the end of thread and the square portion. b) The British Standard number shall not be marked on the tie rods, but shall be used, with the appropriate code letter and the length of the rod t
16、o within 0.1 in., for the purpose of specifying tie rods on drawings and for ordering. For example, the complete part reference of a 5/16 in. UNF tie rod with an overall length of 46.5 in. is SP.118/G/46.5 for ordering, etc., but the corresponding marking on the rod will be G/46.5. c) All tie rods s
17、hall be identified as “Unified” by a plain extension on the end of the thread complying with the dimensions specified in Table 1. 8 Tests Production samples of finished tie rods, or test samples typical thereof, shall be periodically submitted to a tensile test to verify that the rods do not fail at
18、 loads below those specified in Table 1. For rods from any one coil the minimum frequency of such tests shall be: After completion of the forming process one tie rod at the beginning of manufacture from each combination of machines used in the forming process and subsequently one tie rod after every
19、 500 produced. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 118:1958 2 BSI 02-2000 Table 1 Dimensions and code letters of tie rods (UNF threads) Figure 1 Nominal diameter of rod Code letter Tensile str
20、ength Elongation on 2 in. CDFG Dia. of unreduced portion H Dia. of reduced portion J Area of reduced portion Plain cylindrical extension (For tolerance see Table 2) 0 +0.1 0 +0.1+0.002 Diameter P Radius T min.min. max. max.min.max. lbkgper centin.in.in.in.in.in.sq. in.sq. mm.in.in.in. No.832 UNC C1
21、05047632.21.70.160.110.14280.00855.480.0850.0650.010 No. 1032 UNF D1 90086232.31.80.200.140.16880.01298.320.1050.0850.010 1/4 in. UNF E3 4501 56542.52.00.200.190.22580.0230 14.840.1400.1200.010 5/16 in. UNF G 5 7002 58542.82.30.260.250.28430.0391 25.230.1800.1600.010 3/8 in. UNF J8 5003 85653.02.50.
22、320.300.34680.0590 38.060.2400.2200.015 0.1040 +0.006 0.1280 +0.006 0.1710 +0.007 0.2230 +0.009 0.2740 +0.010 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 118:1958 BSI 02-20003 Table 2 Tolerances on di
23、mension C Overall length A Tolerance on C in.in. Minimuma to 19.50+0.25 19.5 to46.50+0.50 46.5 to74.50+0.75 74.5 to98.50+1.00 98.5 to 134.50+1.25 134.5 to 170.50+1.50 170.5 to 202.50+1.75 202.5 and over0+2.00 a The minimum overall lengths are: 14 in. for No. 8-UNC, No. 10-UNF and 1/4 in. UNF rods. 1
24、6 in. for 5/16 in. and3/8 in. UNF rods. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 118:1958 4 BSI 02-2000 Appendix Table for conversion of inches to approximate millimetre equivalents Examples of use
25、 of table: 0.120 in. = 2.54 + 0.508 = 3.048 mm. 19.5 in. = 254.0 + 228.6 + 12.7 = 495.3 mm. InchmmInchmm 1/4 6.3505127.0 5/16 7.9386152.4 3/8 9.5257177.8 125.48203.2 250.89228.6 376.210254.0 4101.6 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:
26、00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:21:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS SP 118:1958 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent nationa
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