safety groove

safety groove

[′sāf·tē ‚grüv]
(ordnance)
A groove incorporated in an item or component of ammunition to ensure that any possible failure will occur at a selected location and thereby will be of a less hazardous nature.
References in periodicals archive ?
Furthermore, the tapered design prevents the groove from snagging a compression ring and being difficult to remove from a holder, as sometimes happens with eyepieces having sharp-edged safety grooves.