International Organization for Standardization (ISO)
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ISO 14277:2002
Scope
This International Standard specifies the dimensions of metric ribbed drivers which are inserted into internal offset cruciform ribbed or unribbed drives used in metric screws in the nominal thread diameter range of 1,6 mm to 20 mm.
The internal offset cruciform, ribbed drives and unribbed drives, respectively are defined in ISO 14275 and ISO 14276.
ISO 14277:2002 history
2002ISO 14277:2002 Aerospace - Drivers, ribbed, for internal offset cruciform ribbed or unribbed drives - Metric series