A vehicular safety restraint inflator device, the inflator device includes a tubular housing to provide inflation gas to inflate an associated inflatable restraint device and a toroidal clamp stop positioned on the tubular inflator housing. The clamp stop serves to provide a hard stop for an inflator attachment clamp to secure the inflator device within an airbag module and thus to minimize or avoid undesired lateral movement of the inflator device within a module assembly.