The 5000 series replaces the current Briton M5000 series.  Designed for heavy traffic, single or double pivoting application doors, the Briton 5000 series floor spring offers compact design and low-profile cement case where floor depth is limited.  The Briton 5000 series floor spring consists of a high-grade cast-iron body, available in two strength sizes 3 and 4.  The securely designed speed-adjustment valves protect the spring mechanism from abuse and adverse weather conditions, and the internal mechanism components utilise heat-treated high-alloy steels and ball bearings for optimum efficiency.  The 5000 series floor spring is suitable for use with timber, metal and tempered glass doors up to 100kg.

The 7500 series replaces the Briton M8000 series.  Designed for heavy traffic, single or double pivoting application doors, the Briton 7500 series floor spring from Allegion offers improved adjustability and versatility.  The Briton 7500 series floor spring consists of a high-grade cast-iron body, which is power adjustable, available in sizes 3 to 6, allowing onsite adjustment to suit the prevailing conditions. The securely designed speed-adjustment valves protect the spring mechanism from abuse and adverse weather conditions, and the internal mechanism components utilise heat-treated high-alloy steels and ball bearings for optimum efficiency.

The 7500 series floor spring is suitable for use with timber, metal and tempered glass doors up to 300kg.