Specification for flanges and bolting for pipes, valves and fittings metric series / 
British Standards Institution 
 - 73 leaves :  illustrations ;  30 cm. 
 - British standard ;  BS 4504 : 1969 .
 - British standard ;  BS 4504 : 1969 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Flanges--Standards.