BS EN 3202:1995 Holes and traps for T-head bolts. Design standard
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This standard specifies a procedure for calculating traps for T-head bolts. This provides standard traps
which prevent the bolts from rotating during tightening and prevent incorrect mating.
The application of T-head bolts may cause flange deformations (notches). Where only small notches are acceptable due to high notch sensitivity of the trap surface, close tolerance bolts and their associated holes for rotating parts shall be used in static parts.
This standard specifies the holes and traps for T-head bolts with head configuration to EN standards for aerospace applications.