Standard ST Connectors

(Straight Tip)

Typical Applications:

Temperature, pressure, and semiconductor test connectors
Medical (non-MRI) devices
Semiconductor industry
Power transformers and EV testing
Instrumentation and high-voltage temperature measurement

Primary Advantages:

The Amphenol 953 series Fiber Optic ST and STII connector utilizes a secure bayonet-style connection
Push-to-turn locking mechanism ensures positive engagement
Prevents overtightening and fiber face damage
Compatible with large core fibers

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Features/Benefits

ST connector body and coupling nut are flame-retardant, lightweight polymer.
STII connector body is zinc die-cast and nickel-plated for strength and corrosion resistance.
High precision zirconia ferrules reduce insertion and return loss.
Available in singlemode (SM) and multimode (MM) versions.
Boot options: 900µm, 2.0mm, 3.0mm, 45°/90° and flex boots.

ST II Connectors with Ceramic Ferrules

Part Number	Description	Ferrule Hole Size	Ferrule Tolerance	Mode	Ferrule Material	Body Material	Nut Material	Insertion Loss	Return Loss	Boot Diameter	Boot Color	Temp Range
953-101-5309-P	ST II Connector	128µm	'+4,-0 µm	MM	Zirconia	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	.35dB	55 dB	2mm	Black	"-40°C to 85°C
953-101-5306-P	ST II Connector	126µm	'+1,-0 µm	SM	Zirconia	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	.15dB	55 dB	3mm or 900 µm	Black	"-40°C to 85°C
953-101-5310-P	ST II Connector	128µm	'+4,-0 µm	MM	Zirconia	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	.35dB	55 dB	3mm or 900 µm	Black	"-40°C to 85°C
953-101-5316-P	ST II Connector	126µm	'+1,-0 µm	SM	Zirconia	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	.15dB	55 dB	2 mm	Blue	"-40°C to 85°C

STII Connectors with Stainless Ferrules

Part Number	Description	Ferrule Hole Size	Ferrule Tolerance	Mode	Ferrule Material	Body Material	Nut Material	Insertion Loss	Return Loss	Boot Diameter	Boot Color	Temp Range
953-106-50128-P	ST II Connector	128µm	'+5,-0 µm	MM	Stainless Steel	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	.35dB	55 dB	3mm or 900 µm	Black	"-40°C to 85°C
953-106-50440-P	ST II Connector	440µm	'+15,-0 µm	MM	Stainless Steel	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	*	*	3mm or 900 µm	Black	"-40°C to 85°C
953-106-51520-P	ST II Connector	1520µm	'+25,-0 µm	MM	Stainless Steel	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	*	*	3mm or 900 µm	Black	"-40°C to 85°C
953-106-50144-P	ST II Connector	144µm	'+5,-0 µm	MM	Stainless Steel	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	.35dB	55 dB	3mm or 900 µm	Black	"-40°C to 85°C
953-106-50231-P	ST II Connector	231µm	'+10,-0 µm	MM	Stainless Steel	Zinc Die Cast and Nickel Plated	Zinc Die Cast and Nickel Plated	*	*	3mm or 900 µm	Black	"-40°Cto 85°C

ST Connectors with Ceramic Ferrules

Part Number	Description	Ferrule Hole Size	Ferrule Tolerance	Mode	Ferrule Material	Body Material	Nut Material	Insertion Loss	Return Loss	Boot Diameter	Boot Color	Temp Range
953-101-5006-P	ST Connector	126µm	'+1,-0 µm	SM	Zirconia	Plastic	Plastic	.15dB	55 dB	3mm or 900 µm	Black	"-40°C to 85°C
953-101-5010-P	ST Connector	128µm	'+4,-0 µm	MM	Zirconia	Plastic	Plastic	.35dB	55 dB	3mm or 900 µm	Black	"-40°Cto 85°C

ST Connectors with Stainless Steel Ferrules

Part Number	Description	Ferrule Hole Size	Ferrule Tolerance	Mode	Ferrule Material	Body Material	Nut Material	Insertion Loss	Return Loss	Boot Diameter	Boot Color	Temp Range
953-107-51520-P	ST Connector	1520µm	'+25,-0	MM	Stainless Steel	Plastic	Plastic	*	*	3mm or 900 µm	Black	"-40°C to 85°C
953-107-50144-P	ST Connector	144µm	'+5,-0 µm	MM	Stainless Steel	Plastic	Plastic	.35dB	55 dB	3mm or 900 µm	Black	"-40°C to 85°C
953-107-50128-P	ST Connector	128µm	'+5,-0 µm	MM	Stainless Steel	Plastic	Plastic	.35dB	55 dB	3mm or 900 µm	Black	"-40°C to 85°C
953-107-50440-P	ST Connector	440µm	'+15,-0	MM	Stainless Steel	Plastic	Plastic	*	*	3mm or 900 µm	Black	"-40°C to 85°C
953-107-50231-P	ST Connector	231µm	'+10,-0	MM	Stainless Steel	Plastic	Plastic	*	*	3mm or 900 µm	Black	"-40°C to 85°C

Note 1: Please contact Amphenol FOP for other configurations and custom hole sizes for stainless steel ferrules. | Note 2: * means Insertion loss and return loss figures are based upon Fiber type and specification

ST Adapters

Part Number	Descrption	Body Material	Mode	Alignment Sleeve Material	Flange Type	Color
953-120-5000	ST Adapter	Plastic	SM	Zirconia	Feed-through, D-Hole	Black Plastic
953-120-5003	ST Adapter	Metal	SM	Zirconia	Feed-through, D-Hole	Silver

953-120-5000 ADAPTER, (Bulkhead), ST, Black Plastic Body & Nut, Ceramic Sleeve

ST Adapters, Black Plastic body and nut ceramic sleeve

953-120-5003 ADAPTER, ST DIE CAST, w/Ceramic Sleeve

ST Adapter with Die Cast, w/Ceramic Sleeve

Dustcap ST Accessories

Part Number	Description
953-1061	ST Dustcap with Chain, 0.130" diameter ring
953-1079	ST Dustcap with Chain, 0.380" diameter ring