Assembly tools for screws and nuts. Machine-operated screwdriver bits - Screwdriver bits for cross-recessed head screws1 Scope This part of ISO 2351 prescribes the technical specifications for machine operated screwdriver bits for cross recessed head screws. It applies to bits with male hexagon drive or with cylindrical flat end drive as defined in ISO 1173, and to tips for screwdrivers as defined in ISO 8764 1. It also gives recommended combinations between tips and bits.

Security threats

BS 903-A27 is particularly suitable for materials having a very thin rubber layer which are difficult to test by stripping or peeling methods

some precise details have been added in the test procedure

and irrespective of the service sector

Sampling device

ISO 7779 simplifies such comparisons and is the basis for the declaration of the noise emission levels of ITT equipment

heat pump water heaters (HPWH) and heat pumps with combined space heating and domestic hot water production in alternate or simultaneous operation

Note: BS EN 50121‑4 does not specify basic personal safety requirements for apparatus such as protection against electric shock

• Protection against overcurrent

BS EN IEC 60974-1 on Welding power sources applies to:

the internal combustion engine is switched off during a complete vehicle stop

18 Special applications of lorry loaders