1、BSI A*233-A*236 O2 W Lb24669 0368840 319 W METRIC AND IMPERIAL UNITS A 233-236, March, 1971 UDC 629-7: 621.882.31 INCORPORATED BY ROYAL CHARTER Teiephom: 01-629 goo0 Teia: 266933 BRITISH STANDARDS INSTITUTION 2 PARK STREET, LONDON WlA 2BS BRITISH STANDARD : AEROSPACE SERIES SPECIFICATION FOR PLAIN H
2、EXAGONAL THIN NUT (OF CLASS 3B UNJ THREAD) , SEP 19a9 - -.- Index form of title: Nut, thin, plain hexagonal, Class 3B UN3 thread. This British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board of the Institution on
3、31 March, 1971. O British Standards Institution, 1971. The institution desires to call attention to the fact that this British Standard does not purport to include all the necessary provisions of a contract. British Sfundards are revised, when necessary, by ihe issue eifher of amendment slips or of
4、revised editions. It is important that users of Biifish Standards should ascerfah that they are in possession of the fatest mendmenis or edirions. The following BSI rcfetences relate to the work on this standard: ammitree reference ACE/ I2 Draft for approval 70/1643 SBN: 580 06289 9 - Price 3Op - NU
5、T, THIN, PLAIN HEXAGONAL, I A233-236 CLASS 3B UNJ THREAD I March, 1971 Thread T see note 4 csk. 110” to major dia. of thread both sides N dia. if required _- *BS Aios4 Vnified screw ihrcads of LYJ basic profile. I NUT, THIN, PLAIN IPEXAGONAL, CLASS 3B kTNJ THREAD A 233-236 March, 1971 T A B max. I.
6、mm in 1.27 0.05 O min +Ob 13 3.00 2-36 0.093 Dash Axial tensile strength, min. ref. only Drill N dia. I in kN Ibf kN Ibf kg/ 100 lb/ 100 5 300 1 200 4 700 1070 0. 14 0.3 8 400 1900 7 500 1700 0.18 0.4 14 400 3 230 17 800 2 880 1 0.27 1 0.6 0.016 23 O00 5 180 20 500 4 620 0.45 I 1.0 32 300 7 270 28 8
7、00 6 480 0.86 1 1-9 44 500 53 200 10000 39 700 8 920 110 1 2.4 11 950 47 500 10 650 1-77 3.9 68 700 I 15 450 61 200 13 780 2-18 4.8 104 300 23 450 93-200 20 950 3.18 7.0 0.070 156 100 I 35 100 139 O00 31 300 4-85 10.7 TABLE 1. “ I H ,Dash no. thread 1- in +0-005 in 10-32UNJF 1 i:; 1 0.97Tp 0.367 0.4
8、31 0.118 -3 -3 0.439 %- 28 UNJF 1 11*15 1 1 12-58 10.90 0.507 O* 125 3-18 3-96 4*78 5-56 -.- 6.35 7-14 7.95 -5 0.580 O. 156 12.75 0.502 0.492 A6- 24UNJF 1 12.50 1 1 14-73 -6 -7 0.65 1 O* 188 0.2 19 17.53 0.690 3 R W L Vire locking holes codirig, if required I Tiircad banding codz IR = right hand tli
9、rcac L = left hand thread, I I I j I Tlirrnd size dai11 110. (Table 1) Standard part no. (Table 1) L 4 BSI A*233-A*23b O2 m 1624669 0368844 T64 m AMD 4133 Amendment No. 1 published and effective from 30 April 1984 to British Standard A 233-236 : 1971 (Aerospace Series) Specification for plain hexago
10、nal thin nut (of class 3B UNJ thread) Revised text Table 2. Delete the existing table and footnote and substitute the following: condition D HR 650 I Mechanical properties Tensile strength: not less than 1080 MFa (157 O00 lbf/in2) 0-2 % proof stress: not less than 650 MPa (94 O00 lbf/in2 ) Tensile s
11、trength: not less than 970 MFa (1 40 O00 lbf/in2 ) Elongation: not less than 12 % Hardness: 290 to 385 HV Finish Cadmium plated to DEF STAN 03-19/1 None Cadmium plated to DEF STAN 03-1 9/ 1 Silver plated to DTD 939 8404-O-1.5k-B ACE11 2 BSI A*233-A*23b O2 1624667 0368845 9TO D Type of material AMD 7
12、769 Mechanical properties Amendment No. 2 to British Standard A 233-236 : 1971 (Aerospace Series) Specification for plain hexagonal thin nut (of class 3B UNJ thread) published and effective from 15 August 1993 NOTE. This amendment specifies alternative material references for Part No. A 233. Revised
13、 text Table 2 (as amended by Amendment No. 1). Delete the existing table 2 arid- substitute the following new table. TABLE 2. Part no. A 233 A 234 A 235 A 236 Steel S 98l) S 139l) S140 I S 147 S 149 Tensile strength: not less than 1080 MPa (157 O00 lbf/in2) 0.2 %proof stress: not less than 650 MPa (
14、94 o00 lbf/in2) Tensile strength: not less than 970 MPa (140 O00 lbf/in2) Elongation: not less than 12 % Hardness: 290 to 385 HV Finish Cadmium plated to DEF STAN 03- 19/ 1 None Cadmium plated to DEF STAN 03-1911 Silver plated to DTD 939 l) S 98 and S 139 are obsolescent standards and their use is only permjtted while existing stocks last. 9308-0-0.5 k-B ACE112
