Assembly tools for screws and nuts — Single-head engineer's wrenches for lower torque applications — Maximum outside dimensions of heads and test torques
ISO 4229:2009 specifies characteristics of single-head engineer's wrenches with gaps from 7 mm to 120 mm, listed in ISO 1703 under the reference Nos. 1 1 01 01 0 and 1 1 01 01 1. The “lower torque application” designation is in accordance with the smaller head dimensions.
Essentially, ISO 4229:2009 establishes the first specifying maximum outside dimensions of heads and gives the test torque values, which are calculated on the basis of approximately half the values, in accordance with ISO 1711-1, series C.
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