Sigmaflex Engineering Pvt. Ltd. Offers Gimbal Hardware Expansion Joint. Sigmaflex Engineering Pvt. Ltd. Manufactures metallic expansion bellows and hoses. Gimbal Hardware Expansion Joint is an assembly designed to absorb angular movement in any plane. The Gimbal Hardware Expansion Joint consists of two sets of hinges, connected to a common floating gimbal ring, which is designed to absorb the pressure thrust of the expansion joint assembly. The expansion joints or bellows are also available in universal, hinged, gamble, & pressure balanced expansion joints.