1、I BSI BS*L083 65 = 1624669 00323b7 ! BRITISH STANDARD 1083: 1965 SPECIFICATION FOR PRECISION HEXAGON BOLTS, SCREWS but elongation values appropriate to this length arc not yet available for the higher grades of steel. The values in Coloma 4 have therefore bn retained pendhg furthet information on th
2、e subject. NOTE 4. Poe Grade A bolts oe screws the minimum elongation sholl.be 10 g3r mat foe 1/4 in and Xie in nominal sh and 14 pee cent for ail other sim up to and hdUdh8 2 in. NOTE 5. Por bolts and screws balorr in diameter a iikhd fracture test may be substi- tuted for the hod impact test (see
3、B.S. 131, Methods foe notched bas tts , Part 1, The hd impact te io simplify production and distribution; to eliminate the waste of time and material involved in the pro- duction of aii unnecessary variety of patterns and sizes of articles for one and the same purpose; to set up staiidai.ds of quali
4、ty and diinensions, and to promote (lie general adoption of British Standards, In carrying out its work the Institution endeavours to ensure adequate representation of ail viewpoints, Before embarking on any project it must be satisfied that there is a strong body of opinion in favour of proceeding
5、and that there is a recognized need to be met. The Institution is a non-profit-making concern. It is financed by subscriptions from firms, trade asso- ciations, professional institutions and other bodies interested in its work, by a Government grant and by the sale of its publications. The demands on the services of the Institution are steadily increasing and can only be met if continuing and increased financial support is provided. Membership of the Institution is open to British subjects, companies, technical and trade associations, and local and public authorities. 7903-1 k-6
