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1、BRITISH STANDARD BS A 211:1961 Incorporating Amendment Nos. 1, 2, 3 and 4 Specification for 100 Countersunk head steel bolts (Unified threads and cruciform recesses) for aircraft UDC 621.882.215:629.13 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:09:47 GMT
2、+00:00 2006, Uncontrolled Copy, (c) BSI BS A 211:1961 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 19 October
3、 1961 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment A (ACE) 3020 ISBN 0 580 34562 9 Amendments issued since publication Amd. No.Date of issueComments 4653October 1962 5313August 1964 6163May 1967 2124October 1976Indicated b
4、y a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:09:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 211:1961 BSI 03-2000i Contents Page Forewordii 1Scope1 2General requirements1 3Material and manufacture1 4Dimensions1 5Screw threa
5、ds1 6Anti-corrosion coating1 7Identification1 8Inspection procedure1 9Gauging1 Appendix A Principles of flushness control and recommended gauging practice9 Appendix B Recess penetration gauging12 Appendix C Table for conversion of inches to approximate millimetre equivalentsInside back cover Figure
6、1 Dimensions2 Figure 1a Enlarged view of head2 Figure 1b Details of recess2 Figure 2 Diagram showing maximum and minimum head conditions3 Figure 35 Figure 4 Method of measurement of head protrusion10 Figure 5 Protrusion gauge block11 Figure 6 Recess penetration gauge12 Figure 7 Gauge point (enlarged
7、)13 Figure 8 Gauge body14 Figure 9 Connecting piece14 Table 1 For bearing length “L”, clamping length “M” and overall length “E”4 Table 2 Bearing length “L”, clamping length “M” and overall length “E”5 Table 311 Table 4 Dimensions of gauge points13 Licensed Copy: London South Bank University, London
8、 South Bank University, Sat Dec 09 03:09:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 211:1961 ii BSI 03-2000 Foreword This British Standard has been prepared at the request of the aircraft industry to provide for a range of steel bolts with countersunk recessed heads and Unified threads. With
9、 the exception of the recesses, the dimensions and tolerances specified are the same as those given in BS 2A 173 for countersunk slotted head bolts. As in BS 2A 173, the “flushness tolerance” method is adopted for the dimensioning of the countersunk head. The basic principles and advantages of this
10、method, first used in a British Standard for countersunk head fasteners in BS 1981, “Unified machine screws and machine screw nuts”, are outlined in Appendix A to this standard, together with suggested methods of gauging. Details of the method of gauging the screw-driver recesses are given in Append
11、ix B. Reference is made in the standard to the following British Standards: BS A 100, Bolts and nuts for aircraft (general clauses). BS S 102, Carbon-molybdenum steel. BS S 105, Carbon steel. BS S 147, Nickel-chromium-molybdenum steel (bar for the manufacture of forged bolts only). BS S 148, Low nic
12、kel-chromium steel (bar for the manufacture of forged bolts only). BS S 149, 1.75 per cent nickel-chromium-molybdenum steel. BS S ., 1 % chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts1). NOTEThe values in British units are to be regarded as the standard. A table i
13、s given in Appendix C to provide a ready means of calculating the approximate millimetre equivalents of the inch dimensions. More accurate conversions should be based on the tables in BS 350. A British Standard does not purport to include all the necessary provisions of a contract. Users of British
14、Standards are responsible for their 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, pages 1 to 14, an inside back cover and a back cover.
15、This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:09:47 GMT+00:00
16、 2006, Uncontrolled Copy, (c) BSI BS A 211:1961 BSI 03-20001 1 Scope This British Standard specifies the material, dimensions, finish and inspection requirements for steel bolts with 100 countersunk recessed heads and Unified threads for aircraft. 2 General requirements The bolts shall comply with t
17、he relevant requirements of Part 1 of BS A 100 in respect of manufacture, screw threads, and anti-corrosion treatment. 3 Material and manufacture a) The bolts shall be forged from material which complies with the latest issue of one of the following British Standards: BS S 102, or BS S 105, or BS S
18、147 or BS S 148 or BS S 149 or BS S .2) b) In the finally heat-treated condition, the mechanical properties of the material shall be as follows: 4 Dimensions a) All finished bolts, after the application of the anti-corrosion coating, shall conform to the dimensions and tolerances given in Table 1 an
19、d Table 2. b) The clamping length M of the bolt shall conform to the dimensions and tolerances given in Table 2, and shall be such that, when a standard nut without countersink or a ring gauge without countersink has been screwed on as far as possible by hand, its leading face is within the distance
20、 M from the upper surface of the bolt head. The run-out of thread shall not exceed twice the pitch. c) The nominal length of the bolt shall be the minimum bearing length L, which is determined by the minimum clamping length M, less two thread pitches. 5 Screw threads The bolts shall have unified thr
21、eads of the form and class of fit specified in the relevant requirements of BS A 100, Part 1. 6 Anti-corrosion coating All finished bolts shall be coated with cadmium. 7 Identification The British Standard number and part number shall not be applied on the bolts, but shall be clearly marked on the l
22、abels of parcels of bolts. 8 Inspection procedure The bolts shall be inspected in accordance with the relevant requirements of BS A 100, Part 2. 9 Gauging a) The method of head dimensioning shown in Table 1 defines maximum and minimum head envelopes which control flushness in the manner described in
23、 Appendix A. b) The type of gauge shown in Figure 4 and Figure 5 is recommended as being suitable for flushness measurement, but the type of gauge to be used is not a mandatory requirement of this standard. The gauge shown in Figure 4 and Figure 5 does not control the head angle, which will require
24、to be checked at intervals during production. An additional gauge will be necessary for the absolute minimum head diameter. c) The penetration of the recess shall be gauged in accordance with Appendix B. 2) In course of preparation. 0.1 per cent proof stress not less than 43 tons/in2 (68 kg/mm2) Ten
25、sile strength not less than 55 tons/in2 (87 kg/mm2) not more than 65 tons/in2 (102 kg/mm2) Elongation on 4 not less than 18 per cent Izod impact value not less than 40 ft lb (6 kg m) area Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:09:47 GMT+00:00 2006, U
26、ncontrolled Copy, (c) BSI BS A 211:1961 2 BSI 03-2000 Figure 1 Dimensions Figure 1a Enlarged view of head Figure 1b Details of recess Third angle projection Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:09:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A
27、211:1961 BSI 03-20003 NOTEGauges suitable for controlling flushness are described in Appendix A. The limits on head protrusion do not permit the extreme limits on diameter to sharp corners and on head angle shown by (1) and (2) to occur in one and the same head. This is because the application of th
28、ese countersunk heads demands a high degree of flushness. (1) Indicates the maximum head protrusion obtainable with the minimum head angle. (2) Indicates the minimum head protrusion obtainable with maximum head angle. Figure 2 Diagram showing maximum and minimum head conditions Licensed Copy: London
29、 South Bank University, London South Bank University, Sat Dec 09 03:09:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 211:1961 4 BSI 03-2000 Table 1 For bearing length “L”, clamping length “M” and overall length “E”, see Table 2 12345678910 Nominal size Decimal equivalent of nominal size Diamete
30、r of plain portion of shank A 2 pitch Min. length of screwed portion of shanka F Ref. only Diameter of headNominal head depthb D (For reference only) To sharp corners V (For reference only) Absolute minimum B max.min.max.min.max. ininininininininin No.832 UNC0.164 00.163 50.160 50.0630.3270.3340.323
31、0.2870.068 No. 1032 UNF0.190 00.189 50.186 50.0630.3770.3870.3750.3370.080 1/4 in UNF 0.250 00.249 50.246 50.0710.4590.5100.4960.4520.106 5/16 in UNF 0.312 50.312 00.309 00.0830.4970.6380.6220.5720.133 3/8 in UNF 0.375 00.374 50.371 50.0830.5970.7660.7480.6920.159 7/16 in UNF 0.437 50.437 00.433 50.
32、1000.6700.8940.8740.8120.186 1/2 in UNF 0.500 00.499 50.496 00.1000.7701.0221.0000.9320.213 11112131415161718192021222324 Nominal size Gauging dia. N Head protrusion Radius under bolt head R Depth of chamfer G RECESS Protrusion above gauging dia. P Flushness (P max. P min.) Depth U Penetrationc Diam
33、eter Sd Recess and driver point number max.min.max. min. max. min. max. min.max.min.nom. ininininininininininininin No.832 UNC 0.267 10.027 6 0.023 80.003 80.020 0.010 0.030 0.020 0.096 0.073 0.0850.0620.1562 No. 1032 UNF 0.314 70.029 9 0.025 90.004 00.020 0.010 0.030 0.020 0.114 0.091 0.1030.0800.1
34、742 1/4in UNF 0.424 50.035 3 0.030 70.004 60.030 0.015 0.040 0.030 0.136 0.113 0.1190.0960.2403 5/16 in UNF 0.538 90.040 9 0.035 70.005 20.030 0.015 0.040 0.030 0.168 0.146 0.1480.1260.3094 3/8in UNF 0.653 20.046 6 0.040 70.005 90.030 0.015 0.040 0.030 0.193 0.171 0.1730.1510.3344 7/16in UNF 0.767 6
35、0.052 2 0.045 70.006 50.030 0.015 0.050 0.040 0.218 0.196 0.1980.1760.3584 1/2in UNF 0.882 00.057 8 0.050 70.007 10.030 0.015 0.050 0.040 0.245 0.223 0.2250.2030.3854 a This dimension is an absolute minimum associated with maximum length M and minimum length E. It is not intended that it shall be us
36、ed for manufacturing or inspection purposes. b These dimensions have been calculated as the mean between maximum and minimum head depth, corresponding to maximum and minimum diameters to sharp corners, the head angle and shank diameter being taken as nominal. c These dimensions refer to the penetrat
37、ion of standard gauge points used with special penetration gauges (see Appendix B). d Diameter S is measured at the points of intersection between the sides of the recess and the upper surface of the head. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:09:47
38、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 211:1961 BSI 03-20005 Table 2 Bearing length “L”, clamping length “M” and overall length “E” Figure 3 No. 832 UNCNo. 1032 UNFNo. 832 UNCNo. 1032 UNF Part No. La min. M +0 0.03 E +0.04 0 Part No. La min. M +0 0.03 E +0.04 0 Part No. La min. M +0 0.03 E
39、 +0.04 0 Part No. La min. M +0 0.03 E +0.04 0 inininininininininininin 1C0.10.1930.551D0.10.1930.6028C2.82.8933.2528D2.82.8933.30 2C0.20.2930.652D0.20.2930.7029C2.92.9933.3529D2.92.9933.40 3C0.30.3930.753D0.30.3930.8030C3.03.0933.4530D3.03.0933.50 4C0.40.4930.854D0.40.4930.90 5C0.50.5930.955D0.50.59
40、31.0031C3.13.1933.5531D3.13.1933.60 32C3.23.2933.6532D3.23.2933.70 6C0.60.6931.056D0.60.6931.1033C3.33.3933.7533D3.33.3933.80 7C0.70.7931.157D0.70.7931.2034C3.43.4933.8534D3.43.4933.90 8C0.80.8931.258D0.80.8931.3035C3.53.5933.9535D3.53.5934.00 9C0.90.9931.359D0.90.9931.40 10C1.01.0931.4510D1.01.0931
41、.5036C3.63.6934.0536D3.63.6934.10 37C3.73.7934.1537D3.73.7934.20 11C1.11.1931.5511D1.11.1931.6038C3.83.8934.2538D3.83.8934.30 12C1.21.2931.6512D1.21.2931.7039C3.93.9934.3539D3.93.9934.40 13C1.31.3931.7513D1.31.3931.8040C4.04.0934.4540D4.04.0934.50 14C1.41.4931.8514D1.41.4931.90 15C1.51.5931.9515D1.5
42、1.5932.0041C4.14.1934.5541D4.14.1934.60 42C4.24.2934.6542D4.24.2934.70 16C1.61.6932.0516D1.61.6932.1043C4.34.3934.7543D4.34.3934.80 17C1.71.7932.1517D1.71.7932.2044C4.44.4934.8544D4.44.4934.90 18C1.81.8932.2518D1.81.8932.3045C4.54.5934.9545D4.54.5935.00 19C1.91.9932.3519D1.91.9932.40 20C2.02.0932.45
43、20D2.02.0932.5046C4.64.6935.0546D4.64.6935.10 47C4.74.7935.1547D4.74.7935.20 21C2.12.1932.5521D2.12.1932.6048C4.84.8935.2548D4.84.8935.30 22C2.22.2932.6522D2.22.2932.7049C4.94.9935.3549D4.94.9935.40 23C2.32.3932.7523D2.32.3932.8050C5.05.0935.4550D5.05.0935.50 24C2.42.4932.8524D2.42.4932.90 25C2.52.5
44、932.9525D2.52.5933.0051C5.15.1935.5551D5.15.1935.60 52C5.25.2935.6552D5.25.2935.70 26C2.62.6933.0526D2.62.6933.1053C5.35.3935.7553D5.35.3935.80 27C2.72.7933.1527D2.72.7933.20 Bolt lengths greater than eight times shank diameter should be avoided where possible as open dies may be required in manufac
45、ture. a See Clause 4 c). Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:09:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 211:1961 6 BSI 03-2000 Table 2 Bearing length “L”, clamping length “M” and overall length “E” 1/4 in UNF5/16 in UNF3/8 in UNF Part N
46、o. La min. M +0 0.03 E +0.04 0 Part No. La min. M +0 0.03 E +0.04 0 Part No. La min. M +0 0.03 E +0.04 0 2E 3E 4E 5E in 0.2 0.3 0.4 0.5 in 0.301 0.401 0.501 0.601 in 0.80 0.90 1.00 1.10 2G 3G 4G 5G in 0.2 0.3 0.4 0.5 in 0.313 0.413 0.515 0.613 in 0.85 0.95 1.05 1.15 2J 3J 4J 5J in 0.2 0.3 0.4 0.5 in
47、 0.313 0.413 0.513 0.613 in 0.95 1.05 1.15 1.25 6E 7E 8E 9E 10E 0.6 0.7 0.8 0.9 1.0 0.701 0.801 0.901 1.001 1.101 1.20 1.30 1.40 1.50 1.60 6G 7G 8G 9G 10G 0.6 0.7 0.8 0.9 1.0 0.713 0.813 0.913 1.013 1.113 1.25 1.35 1.45 1.55 1.65 6J 7J 8J 9J 10J 0.6 0.7 0.8 0.9 1.0 0.713 0.813 0.913 1.013 1.113 1.35
48、 1.45 1.55 1.65 1.75 11E 12E 13E 14E 15E 1.1 1.2 1.3 1.4 1.5 1.201 1.301 1.401 1.501 1.601 1.70 1.80 1.90 2.00 2.10 11G 12G 13G 14G 15G 1.1 1.2 1.3 1.4 1.5 1.213 1.313 1.413 1.513 1.613 1.75 1.85 1.95 2.05 2.15 11J 12J 13J 14J 15J 1.1 1.2 1.3 1.4 1.5 1.213 1.313 1.413 1.513 1.613 1.85 1.95 2.05 2.15
49、 2.25 16E 17E 18E 19E 20E 1.6 1.7 1.8 1.9 2.0 1.701 1.801 1.901 2.001 2.101 2.20 2.30 2.40 2.50 2.60 16G 17G 18G 19G 20G 1.6 1.7 1.8 1.9 2.0 1.713 1.813 1.913 2.013 2.113 2.25 2.35 2.45 2.55 2.65 16J 17J 18J 19J 20J 1.6 1.7 1.8 1.9 2.0 1.713 1.813 1.913 2.013 2.113 2.35 2.45 2.55 2.65 2.75 21E 22E 23E 24E 25E 2.1 2.2 2.3 2.4 2.5 2.201 2.301 2.401 2.501 2.601 2.70 2.80 2.90 3.00 3.10 21G 22G 23G 24G 25G 2.1 2.2 2.3 2.4 2.5 2.213 2.313 2.413 2.513 2.613 2.75 2.85 2.95 3.05 3.15 21J 22J 23J 24J 25J 2.1 2.2 2.
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