SC Connector Threaded, Key oriented coupling mechanism which allows repeatable, low loss connections Simplex or Duplex and multi       fiber  assemblies,
ST Coupler
Description: ST fiber optic couplers are all threaded type, with metal housing, single mode ones are with zirconia sleeve and multimode ones are with bronze sleeve. ST fiber optic adaptors are simplex adaptors.
   
LC Coupler
Description: LC fiber optic Couplers are all plastic housing, usually duplex LC fiber Couplers are with SC footprint. The LC fiber Couplers are with bronze sleeve for multimode and zirconia sleeve for single mode.
   
MTRJ Coupler
Description: MTRJ fiber optic coupler are with polymer housing, there are two types available, one is flange type; another is SC footprint type, both simplex. MTRJ fiber optic adaptors are black color.
FC Coupler
Description: FC fiber optic Couplers, square type, are with metal housing, & zirconia sleeves. Multi mode FC fiber optic adaptors are with bronze sleeves. All FC fiber optic adaptors are simplex.

SC Connector Threaded, Key oriented coupling mechanism which allows repeatable, low loss connections Simplex or Duplex and multi       fiber  assemblies,
ST Coupler
Description: ST fiber optic couplers are all threaded type, with metal housing, single mode ones are with zirconia sleeve and multimode ones are with bronze sleeve. ST fiber optic adaptors are simplex adaptors.
   
LC Coupler
Description: LC fiber optic Couplers are all plastic housing, usually duplex LC fiber Couplers are with SC footprint. The LC fiber Couplers are with bronze sleeve for multimode and zirconia sleeve for single mode.
   
MTRJ Coupler
Description: MTRJ fiber optic coupler are with polymer housing, there are two types available, one is flange type; another is SC footprint type, both simplex. MTRJ fiber optic adaptors are black color.
FC Coupler
Description: FC fiber optic Couplers, square type, are with metal housing, & zirconia sleeves. Multi mode FC fiber optic adaptors are with bronze sleeves. All FC fiber optic adaptors are simplex.