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Rixson identification helps...

Model 18/20/25 Old StyleHandedOffset hungSingle actingSized spring'Keyed' spindleIdentified by size of caseAvailable in 180° No Hold Open (NHO)Model 18: 7-1/4" x 4"Model 20: 8-1/4" x 4-3/8"Model 25: 9-3/8" x 5-1/4"

Model 18/20/25 New StyleHandedOffset hungSingle actingSized springTriangle shaftIdentified by size of caseAvailable in 180° No Hold Open (NHO)One adjustment screwModel 18: 7-1/4" x 4"Model 20: 8-1/4" x 4-3/8"Model 25: 9-3/8" x 5-1/4"

Model 21/26HandedCenter HungSingle actingRectangle tapered spindleAvailable in 180° No Hold Open (NHO)One adjustment screwModel 21: 8-1/4" x 4-3/8"Model 26: 9-3/8" x 5-1/4"

Model 27HandedOffset hungSingle actingSized springTriangle shaftDimensions: 9-3/8" x 5-1/4"

Model 28HandedCenter hungSingle actingSized springRectangle tapered spindleDimensions: 9-3/8" x 5-1/4"

Model 30Non handedCenter hungDouble actingSized spring (heavy duty)Rectangle shaftDimensions: 14-1/8" x 5"

Model 40Non handedCenter hungDouble actingSized spring (heavy duty)Rectangle shaftDimensions: 16-1/2" x 5-5/8"

Model 65-68 "UNI"HandedOffset hungSingle actingAvailable in Hold Open and No Hold OpenRectangle shaftDimensions: 11" x 5-5/8"

Model 5010HandedCenter hungSingle actingAvailable in Hold Open and No Hold OpenBackcheck availableShallow depthDimensions: 19-1/8" x 4-1/2"

Model 5020Non handedCenter hungDouble actingAvailable in Hold Open and No Hold OpenBackcheck availableShallow depthDimensions: 19-1/8" x 4-1/2"

Model 5100HandedOffset hungSingle actingAvailable in Hold Open and No Hold OpenBackcheck availableSized spring (3-5)Shallow depthDimensions: 19-1/8" x 4-1/2"