
Machine screws and machine screw nuts (BSW and BSF threads)
出版:Standards Australia

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Specifies dimensions and tolerances and general requirements for machine screws of the following types: 90 countersunk and raised countersunk, round, pan, cheese and mushroom with slotted heads, and 90 countersunk and raised countersunk, round, pan, raised cheese and mushroom with recessed heads.
BS 450:1958 - Identical