1、i 1 k UDC 621.582.3 : 669.14 : 629.13 r- - _. - r, BRITISH STANDARDS INSTITtTTION 2 PARK STREET, LONDON WlA2BS BRITISH STANDARD SPECIFICATI CORROSION-RESISTING STEEL NUTS-=-=Zl= (UNIFIED HEXAGONS AND UNIFIED THREADS) (ORDINARY, THIN, SLOTTED AND CASTLE) FOR AIRCRAFT FOREWORD This revision of British
2、 Standard 2A.105 : 1956 has been prepared to relate the standard to the relevant requirements of British Standard A.100. Reference is made in the standard to the following British Standards: A.100 S.80 Bolts and nuts for aircraft (general clauses) 55 ton high chromium-nickel steel (corrosion-resisti
3、ng). NOTE The values in British units are to be regarded as the stzndard. A table is given in the appendix to provide a ready means of c3IcuIatiug the approximate millimetre equivalents of the inch dimensions. More accurate conversions should be based on the tcblas in B.S. 350. SPECIFICATION b. The
4、nuts shall be hexagonal and chmifered on i;:h SCOPE 1. This British Standard specifies the materials, dirnen- sions and inspection procedure for corrosion-resisting steel craft use. It makes provision for ranges of ordinary, thin, slotted and castle nuts. as shown in 27 3 and 4- nuts with Unied hexa
5、gons and Unified threads for air- DIiMENSIONS 4. All finished nuts shall conform io the dimensions and tolerances given in Tables I, 2, 3 or 4. GEiNERAL KEQLTREhfENTS SCREW THREADS 2. The nuts shall comply with the relevant requirements of Fart 1 of British Standard A.IC0 in respect of manufx- ture,
6、 screw threads, identification and marking. 5. me nuts shall have Unified threads of the form and class of fit specified in the relevant eauircnicnis i;: British Standard A.IGO, Part 1. MATERIAL AND 5fA?GJ.iUi;ACTURE INSPECTION PROCEDUnZ 3. U. The nuts shall be machined from bright bars which comply
7、 with the latest issiie ot Scitish Standard SSO. 6. The nuts shail be inspected in accordmcz i.:titt; releyant recuirements of British Stniidnr,i A. Co. t:!: 2. 3 A. 105, May, 1962 TABLE 1. DIMENSIONS OF ORDMARY NUTS (Third Angle Projcction) 1 No. 4-4UNC N. 6-32UNC No. 10-32 UNF NO. 8-32 UNC Counter
8、rik 90-1200n one face only to major diameter of thread Fig. 1 2 in 0.1120 0.1380 0.1640 0.1900 0.2500 0.3125 0.3750 0.4375 0.5oOO 06625 0.6250 0*75CO 0*8750 1.oooO 314 Part reference RIght-had thread Al? BP CP DP EP GP JP LP NP PP QP SP UP WP Left-hand hd APL BPL CPL DPL EIL . GPL JPL LPL NPL PPL QP
9、L SPL UPL WPL 516 Width acrosa flats max. in 0.188 0.250 0.312 0.344 0.438 0.500 0.562 0.688 0.750 0.875 0.938 1.062 1.250 1.438 min. in 0.183 0.245 0.307 0.339 0.431 0.493 0,554 0.679 0.741 0.866 0.929 1,052 1*240 1.426 7 819 Width across , ThiCbeSS I max. I max. 0-217 0.105 0.289 0.i25 0.361 0.397
10、 0-505 0.577 0.650 0.794 0.866 1.010 1.083 1.227 1.443 1.650 0.155 0.167 0.200 0.250 0.312 0.375 0.437 0.500 0-562 067 0.750 0.875 P niin. in 0.005 0.115 0.145 0.157 0.1% 0.M 0.:u2 0.365 0.427 0.400 0.552 0.677 O,40 0.865 2 1 Nominal size No. WUNC NO. 6-32 UNC NO. 8-32 UNC No. 1-32 UNF 56 in UNF % i
11、n UNF % in UNF 1 in UNF BSI 3A*it105 62 m Lb24bb OLOL23i7 b m 2 Decimal equivalent of nominal size in 0.1120 0.1380 0.1640 0.1900 0.2500 0-3125 0*3750 0.4375 0-5oOp 0.5625 06250 0-7500 0.8750 1-oooO 3 A. 105, May, 1962 TABLE 2. DIMENSIONS OF THIN NUTS (Third Xnjie Projection) Countersink 90-12000n o
12、ne face only to major diameter of thread E - 3 O“ lJ 1.062 WTL i 1438 min. in 0.183 0.245 0.307 0.339 0.431 0-493 0.554 0679 0.741 0.866 0.929 1.052 1.240 1-426 7 819 - hickness Width across comem C - in I in 0.217 0.073 0-289 t 0.089 0.361 0.397 0.505 0.577 0.650 0.794 0.866 1.010 1.083 1.227 1.443
13、 0.113 0.123 0.133 0.166 0.208 0.250 0.333 0.375 0,453 0.500 0.291 1.660 0.583 I I min. in 0.063 0.079 0.103 0.113 3 Nominal sb Pari reference *a - equiva- lent of Right- nominal hand size thread No. 10-32 UMF in u.1m % in UNF %a in UNFI % h UNF 0.3750 0.4375 0.5000 linUNF l*ooOo BSI 3A*2RC 62 I i16
14、24669 0201228 8 S . 3 A* 185, May, 1962 TABLE 3. DIMENSIONS OF SLOTTED NUTS .- , . - e . .: .:. .e.- “ a: 1 I. . . (Third Angle Projection) Countersink 90-12000n this face only to major diameter of thread Fig, 3 NOTE, The clots may at the option of the manufacturer be made rounded as in Table 4, Fig
15、. 4, or rectangular as ir. Fig. 3 above. 516 7 Width across corners C max. Slot i I Lower nut;simtom face of Width , Widh across Hats - Left- band head Depth J approx. I -1- ma. max. Illin. min. in 0.240 0-250 0.270 0.302 0.365 0.427 0-490 0.552 0.677 0.740 - 0.865 min. min. in 0-150 0.160 0.180 0.2
16、12 0.225 0.237 0.303 0.365 0443 0.506 0.585 max. max. in 0.339 0.431 0.493 0654 0.679 0.741 0.866 0.929 1.052 1.240 1426 in 0.397 0.505 0.577 0.650 0.794 0.866 1-083 1*010 1.227 1.443 1.660 in 0.250 0.260 0.280 0.312 0.375 04-37 0.500 0.562 0.667 0.750 0.875 in 0.090 0.0% 0.W 0.090 0.140 0.140 0.187
17、 0.187 0.234 0.234 0.280 in 0.080 0.W 0.090 0.090 0.125 0.125 0.165 0.165 0.208 0.208 0-250 in in 0.090 0.160 0.100 i 0.170 I 0.100 i 0.1% 0.100 0222 0.135 : 0.235 0.135 j 0-297 I DS Es GS JS LS NS PS QS ss us ws 0.175 0.313 0.175 I 0.375 0.218 , 0.453 0.218 0.516 0.260 0.595 4 BSI 3A*105 b2 I lb24b
18、b9 0101219 T I 3 A. 105, May, 1962 TABLE; 4. DIMENSIONS OF CASTLE NUTS (Third Angle Projection) Countersink 90“- I200n this face only to major diameter of thread Fig. 4 NOTE. The slots may at the option of the manufacturer, be made rectangular as in Table 3, Fig. 3, OP rounded as iri Fig. 4 above. 1
19、 Nominal size %inUNF SASinUNF %.in UNF in UNF l/c, in UNF 8/i6 in UNF 94 in UNF %inUNF 7/8 in UNF I - 2 kcimal pquiva- lent OC IOmind size in 0.2500 0.3125 0.3750 0.4375 0.5000 0,5625 0.6250 0.7500 0.8750 3 Part eferen EC GC JC LC NC PC QC sc uc WC 415 Width across Rats max. in 0.438 0.500 0.562 0.6
20、88 0.750 0.875 0.93s 1.062 1.250 1.438 min. in 0.431 0.493 0-554 0.679 0.741 0.866 0.929 1.052 1-240 1-426 - 6 - Width across :ornem C max. - in 0.505 0.577 0.650 0-794 0.866 1.010 1.083 1.227 1.443 1.660 - 718 Tohi thiclmesc M max. I min. 0.687 10.67 0.749 10.73 0.921 10.91 I 0,984 0.97 ! 1.155 i 1
21、.14 hexagon face of nut to bottom of slots - max. in 0.200 0-250 0.312 0.375 0.437 0.500 0.562 0687 0.750 0.875 - -. IN min. I max. I min. - 0.240 IO.4.5 0.475 0.302 0.545 0.535 0.365 0670 0.660 0.427 I0.735 i 0.725 0.490 I 0.860 1 0.850 0.552 0.920 0.910 0-677 1.045 11-0.25 0.740 1.230 1.210 ;I 0.8
22、65 II 119420 I 1.400 I I 13 I 14 I 15 I 16 Slot I- in 0.oIo 0.090 0.090 0.140 0.140 0.187 0.187 0.234 0-234 Width /;e: min. I max. (approx. cham- K O-O?X O-lCO 10.05 0.125 0.135 0.06 0.125 0.135 0.06 0.165 0.115 IO-O6 ! 0.280 0.250 0.260 0.09 1 li c ., BSI 3A*L05 62 6 Lb24bb O101220 b APPENDIX TABLE
23、 FOR CONVERSION OF INCHES TO APPROXIMATE MILLIMETRE EQUIVALENTS ?4 34 He %6 ?i 34 .% %6 6.4 7.9 9.5 11.1 12.7 14.3 15.9 19.1 22.2 9 10 25.4 50.8 76.2 101.6 127.0 152.4 177.8 203.2 228.6 254.0 This Iaritish Standard, having been approved by the Aircraft Industry Standards Cornittee and endorsed by tl
24、ic Chr:x of the Engineering Divisional Council, was published under the authority of the General Council of the Institution on 2nd May, 1962. Tic Institution desires to call attention to the fact that this stanard does not purport to inciude al! the cec:s;ar:y :tr:aT9:.:x of ;1 coiltract. 3rtish Sta
25、ridards are revised, when necessar,v, b,v tfie issue eitfier of arnendrnenf slips or of reivised edirions. Ii is important thut users of British Standards shoiiid ascertairi that they are in possession of t1ic latest arnerhrmis or ediiliom. Tiic following D.S.I. references relate to the work on this standard: Comniittee reference ACE/l?. Draft for comment AB (ACE) 1151.
