Standard [CURRENT]
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Male square wrenches in accordance with this standard are used to open and close drain screws in accordance with DIN 87721-1 and DIN 87721-2 on ships. The dimensions, design details and materials are specified for two sizes of these wrenches. The responsible committee for this standard is NA 132-02-06 AA "Rohrleitungsarmaturen" ("Fittings armatures") at DIN.
This document replaces DIN 87314:1987-11 .