Thorlabs Inc.
Visit the Terminated Fiber Adapters page for pricing and availability information

Terminated Fiber Adapters

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OVERVIEW

Threaded & Unthreaded Adapters
Thorlabs offers various types of fiber connector adapters, which allow the most common types of connectorized fibers to be integrated with SM-threaded, C-Mount-threaded, or unthreaded components. Adapters for patch cables with FC/PC, FC/APC, SMA, ST®/PC, SC/PC, or LC®/PC connectors are available; for Ø2.5 mm ferrules we also offer an externally SM1-threaded (1.035"-40) ferrule adapter. If the threading and connector combination you need is not shown below, please contact tech support. Our complete line of thread adapters can also be used to convert between threadings.

These adapters are commonly employed when building single mode or multimode fiber couplers and collimators or in other free-space coupling applications. They can also be utilized to provide light-tight coupling to our SM05- (0.535"-40) or SM1- (1.035"-40) threaded photodetectors and many of our power meter sensors. Our C-Mount-threaded fiber adapters are useful for connecting patch cables to our C-Mount cameras.

Bulkhead Adapters
Thorlabs' FC/PC and SMA Bulkhead Adapters contain one connector for the projection of light into free space. Their compact size, one-piece construction, and mounting thread make them ideal for OEM or custom aplications. The design aligns the front face of the connector ferrule with the rear surface of the adapter. This allows the fiber to be placed in near-physical contact with any optics or instruments that are placed after the adapter.

Post-Mounting Adapter
The FCM is a post-mounting adapter for FC- or ST-connectorized fibers, or any other fiber connectorized with a 2.5 mm outer diameter ferrule, such as our lightweight patch cables. This flexure clamp includes an 8-32 (M4) tapped hole for post mounting, and uses a 5/64" (2 mm) hex to secure the ferrule.

Hide Externally SM05-Threaded Fiber Adapters

Externally SM05-Threaded Fiber Adapters

  • SM05-Threaded (0.535"-40) Disks with FC/PC, FC/APC, SMA, or ST/PC Receptacle
  • Light-Tight Construction when used with SM05 Lens Tubes
  • Compatible with Many of Our 16 mm Cage Plates

Note: The ST and SMA adapters have indents/dimples in the front surface to allow the adapter to be tightened with the SPW801 spanner wrench. Note that these indents do not go all the way through the disk. The FC receptacle is too large to include the tightening indents. Instead we recommend putting an FC connector into the receptacle of the adapter to aid in tightening.

Item #SM05FCaSM05FCAbSM05SMAcSM05ST
Adapter Image
(Click the Image to Enlarge)
SM05FC SM05FCA SM05SMA SM05ST
Connector Type FC/PC FC/APC SMA ST/PC
Threading External SM05 (0.535"-40)
  • The FC/PC bulkhead, without the SM05-threaded plate, is available separately below.
  • Please note that the SM05FCA has a mechanical angle of only 4°, even though the standard angle for these connectors is 8°. There is a 4° angle of deflection caused by the glass-air interface; when combined with the 4° mechanical angle, the output beam is aligned perpendicular to the adapter face.
  • The SMA bulkhead, without the SM05-threaded plate, is available separately below.
Part Number
Description
Price
Availability
SM05FC
FC/PC Fiber Adapter Plate with External SM05 (0.535"-40) Thread
$27.30
Today
SM05FCA
FC/APC Fiber Adapter Plate with External SM05 (0.535"-40) Thread
$32.00
Today
SM05SMA
SMA Fiber Adapter Plate with External SM05 (0.535"-40) Thread
$27.30
Today
SM05ST
ST/PC Fiber Adapter Plate with External SM05 (0.535"-40) Thread
$27.30
Today
Hide Internally SM05-Threaded Fiber Adapters

Internally SM05-Threaded Fiber Adapters

  • SM05-Threaded Disks with FC/PC, SMA, ST/PC, SC/PC, or LC/PC Receptacle
  • Internal SM05 (0.535"-40) Threading
  • Light-Tight Construction when used with SM05 Lens Tubes
  • Compatible with Our Fiber Optic Power Meters
Item #PM20-FCPM20-SMAPM20-STPM20-SCPM20-LC
Adapter Image
(Click the Image
to Enlarge)
PM20-FC PM20-SMA PM20-ST PM20-SC PM20-LC
Connector Type FC/PCa SMA ST/PC SC/PC LC/PC
Threading Internal SM05 (0.535"-40)
  • In certain angle-independent applications, this adapter may also be used with FC/APC connectors.
Part Number
Description
Price
Availability
PM20-FC
FC/PC Fiber Adapter Cap with Internal SM05 (0.535"-40) Thread
$31.00
Today
PM20-SMA
SMA Fiber Adapter Cap with Internal SM05 (0.535"-40) Thread
$31.00
Today
PM20-ST
ST/PC Fiber Adapter Cap with Internal SM05 (0.535"-40) Thread
$43.00
Today
PM20-SC
SC/PC Fiber Adapter Cap with Internal SM05 (0.535"-40) Thread
$43.00
Today
PM20-LC
Customer Inspired!LC/PC Fiber Adapter Cap with Internal SM05 (0.535"-40) Thread
$43.00
3-5 Days
Hide Externally SM1-Threaded Fiber Adapters

Externally SM1-Threaded Fiber Adapters

Each disk has two dimples in the front surface so it can be tightened with the SPW909 or SPW801 spanner wrench. The dimples do not go all the way through the disk so that the adapters can be used in light-tight applications when paired with SM1 lens tubes. Once the adapter is at the desired position, use an SM1RR retaining ring to secure it in place.

For an externally SM1-threaded Ø2.5 mm ferrule adapter, please see below.

Item # SM1FCa SM1FCAb SM1SMAc SM1ST
Adapter Image
(Click the Image to Enlarge)
SM1FC SM1FCA SM1SMA SM1ST
Connector Type FC/PC FC/APC SMA ST/PC
Threading External SM1 (1.035"-40)
  • The FC/PC bulkhead, without the SM1-threaded plate, is available separately below.
  • Please note that the SM1FCA has a mechanical angle of only 4°, even though the standard angle for these connectors is 8°. There is a 4° angle of deflection caused by the glass-air interface; when combined with the 4° mechanical angle, the output beam is aligned perpendicular to the adapter face.
  • The SMA bulkhead, without the SM1-threaded plate, is available separately below.
Part Number
Description
Price
Availability
SM1FC
FC/PC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$28.35
Today
SM1FCA
FC/APC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$30.00
Today
SM1SMA
SMA Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$28.35
Today
SM1ST
ST/PC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$28.35
Today
Hide Internally SM1-Threaded Fiber Adapters

Internally SM1-Threaded Fiber Adapters

  • Internally SM1-Threaded (1.035"-40) Disks with FC/PC, SMA, ST/PC, SC/PC, or LC/PC Receptacle
  • Light-Tight Construction when used with SM1 Lens Tubes
  • Compatible with Many of Our Photodiode Power Sensors
Item #S120-FCaS120-SMAbS120-STS120-SCS120-LC
Adapter Image
(Click the Image
to Enlarge)
S120-FC S120-SMA S120-ST S120-SC S120-LC
Connector Type FC/PCc SMA ST/PC SC/PC LC/PC
Threading Internal SM1 (1.035"-40)
  • The FC/PC bulkhead, without the SM1-threaded plate, is available separately below.
  • In certain angle-independent applications, this adapter may also be used with FC/APC connectors.
  • The SMA bulkhead, without the SM1-threaded plate, is available separately below.
Part Number
Description
Price
Availability
S120-FC
FC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$38.00
Today
S120-SMA
SMA Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$38.00
Today
S120-ST
ST/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$38.00
Today
S120-SC
SC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$48.00
Today
S120-LC
LC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$48.00
Today
Hide Externally C-Mount-Threaded Fiber Adapters

Externally C-Mount-Threaded Fiber Adapters

  • C-Mount (1.000"-32) Threaded Disks with FC/PC, FC/APC, or SMA Receptacle
  • Light-Tight Construction
  • Compatible with Our SPW909 and SPW801 Spanner Wrenches
  • Compatible with Our C-Mount Cameras
Item #CMTFCaCMTFCAbCMTSMAc
Adapter Image
(Click the Image to Enlarge)
CMTFC CMTFCA CMTSMA
Connector Type FC/PC FC/APC SMA
Threading External C-Mount (1.000"-32)
  • The FC/PC bulkhead, without the C-Mount-threaded plate, is available separately below.
  • Please note that the CMTFCA has a mechanical angle of only 4°, even though the standard angle for these connectors is 8°. There is a 4° angle of deflection caused by the glass-air interface; when combined with the 4° mechanical angle, the output beam is aligned perpendicular to the adapter face.
  • The SMA bulkhead, without the C-Mount-threaded plate, is available separately below.
Part Number
Description
Price
Availability
CMTFC
FC/PC Fiber Adapter Plate with C-Mount (1.00"-32) Thread
$27.30
Today
CMTFCA
FC/APC Fiber Adapter Plate with C-Mount (1.00"-32) Thread
$42.00
Today
CMTSMA
SMA Fiber Adapter Plate with C-Mount (1.00"-32) Thread
$27.30
Today
Hide Unthreaded Ø1/2" Fiber Adapters

Unthreaded Ø1/2" Fiber Adapters

  • Unthreaded Ø1/2" Disk with an FC/PC, FC/APC, or SMA Receptacle
  • Compatible with Optomechanics for Ø1/2" Optics
  • Light-Tight Construction
Item # S05FC S05FCAa S05SMA
Adapter Image
(Click the Image to Enlarge)
S05FC S05FCA S05SMA
Connector Type FC/PC FC/APC SMA
Outer Diameter 1/2"
Disk Thickness 2.5 mm 1.5 mm 3.2 mm
  • Please note that the S05FCA has a mechanical angle of only 4°, even though the standard angle for these connectors is 8°. There is a 4° angle of deflection caused by the glass-air interface; when combined with the 4° mechanical angle, the output beam is aligned perpendicular to the adapter face.
Part Number
Description
Price
Availability
S05FC
Ø1/2" FC/PC Fiber Adapter Plate Without Thread
$27.30
Today
S05FCA
Ø1/2" FC/APC Fiber Adapter Plate Without Thread
$32.00
Today
S05SMA
Ø1/2" SMA Fiber Adapter Plate Without Thread
$27.30
Today
Hide Unthreaded Ø1" Fiber Adapters

Unthreaded Ø1" Fiber Adapters

  • Unthreaded Ø1" Disk with an FC/PC, FC/APC, or SMA Receptacle
  • Compatible with Optomechanics for Ø1" Optics
  • Light-Tight Construction

Each adapter shown here has two small dimples for aligning the adapter with our SPW909 fixed spanner wrench or SPW801 adjustable spanner wrench. The dimples do not go all the way through the disk so that the adapters can be used in light-tight applications.

Item # S1FCa S1FCAb S1SMAc
Adapter Image
(Click the Image to Enlarge)
S1FC S1FCA S1SMA
Connector Type FC/PC FC/APC SMA
Outer Diameter 1"
Disk Thickness 2.5 mm 2.5 mm 3.2 mm
  • The FC/PC bulkhead, without the unthreaded adapter plate, is available separately below.
  • Please note that the S1FCA has a mechanical angle of only 4°, even though the standard angle for these connectors is 8°. There is a 4° angle of deflection caused by the glass-air interface; when combined with the 4° mechanical angle, the output beam is aligned perpendicular to the adapter face.
  • The SMA bulkhead, without the unthreaded adapter plate, is available separately below.
Part Number
Description
Price
Availability
S1FC
Ø1" FC/PC Fiber Adapter Plate Without Thread
$28.35
Today
S1FCA
Ø1" FC/APC Fiber Adapter Plate Without Thread
$32.00
Today
S1SMA
Ø1" SMA Fiber Adapter Plate Without Thread
$28.35
Today
Hide Bulkhead Adapters

Bulkhead Adapters

Bulkhead Adapters
Click to Enlarge

HASMA Adapter Attached to an SMA-Terminated Fiber Patch Cable
  • Ideal for OEM or Custom Applications
  • 2.2 mm Wide-Key-Slot FC/PC Bulkhead Adapter
  • SMA905- or SMA906-Style Bulkhead Adapter
  • Project Light into Free Space

Thorlabs' Bulkhead Adapters contain one connector for the projection of light into free space, where the light can then be manipulated or used by other optical devices, such as lenses or detectors. Ideal for OEM or custom applications, the design aligns the front face of the connector ferrule with the rear surface of the adapter, as shown in the photo to the right. The lack of a second connector at this surface allows for the projection of light from the fiber into free space. It also allows the fiber to be placed in near-physical contact with any optics or instruments that are placed after the adapter.

The HAFC adapter has a 2.2 mm wide-key-slot FC/PC bulkhead for compatibility with our FC/PC terminated fiber optic patch cables. Opposite the FC/PC connector is a 3/8"-24 external mounting thread used for mounting the bulkhead adapter into OEM or custom systems.

Our HASMA adapter is 0.38" (9.65 mm) long, with a 1/4"-36 threaded barrel for use with SMA905- and SMA906-style terminated fiber optic patch cables. The threaded barrel can also be used with the lock nut for mounting within OEM or custom systems.

The uncommon mounting threads in these adapters will require the use of custom mounting solutions. We recommend engaging at least two threads for stability when using a custom mount, with thread locker (Loctite) as an option for permanent solutions. If tapping a hole is not an option, the adapters can also be epoxied in place.

If a custom or OEM solution is not desired, both adapters are also available mounted within SM-threaded disks (sold above) for compatibility with our lens tube systems. Fiber and bulkhead caps are also available for preventing damage to the connectorized fiber when it is not in use.

Part Number
Description
Price
Availability
HAFC
NEW! FC/PC Bulkhead Adapter, Wide Key (2.2 mm)
$17.00
Today
HASMA
NEW! SMA Bulkhead Adapter with Lock Nut
$7.70
Today
Hide Externally SM1-Threaded Ø2.5 mm Ferrule Adapter

Externally SM1-Threaded Ø2.5 mm Ferrule Adapter

Ferrule Clamp
Click to Enlarge

An SM1FCM Adapter Shown in a KM100T SM1-Threaded Kinematic Mount with Ferrule-Connectorized Patch Cable

The SM1FCM Ferrule Adapter Plate allows a Ø2.5 mm ferrule connector to be mounted within SM1-threaded (1.035"-40) systems. The disk is externally SM1-threaded (1.035"-40) and has two dimples for tightening using an SPW909 or SPW801 Spanner Wrench. These dimples do not pass through the disk, ensuring the SM1FCM is light-tight when used with SM1-threaded (1.035"-40) lens tubes. Once the adapter is in the desired position, use an SM1RR retaining ring to secure it in place.

The flexure clamp for the ferrule is secured with a 4-40 cap screw, which can be tightened using a 3/32" balldriver or hex key; approximately 1.25 in-lbs (0.14 N·m) of torque is sufficient. When the ferrule is correctly positioned, the distance from the fiber end face to the adapter face is 0.01" (0.3 mm).

Part Number
Description
Price
Availability
SM1FCM
Customer Inspired!Ø2.5 mm Ferrule Adapter Plate with External SM1 (1.035"-40) Thread
$60.00
Today
Hide Post-Mountable Ø2.5 mm Ferrule Clamp

Post-Mountable Ø2.5 mm Ferrule Clamp

Ferrule Clamp
Click to Enlarge

FCM Clamp with Ferrule-Connectorized Cable
  • Compact Flexure Clamp for Ø2.5 mm Ferrules
  • Compatible with FC/PC, FC/APC, ST/PC, and Ferrule Connectors with a 2.5 mm Outer Diameter
  • 8-32 (M4) Tapped Mounting Hole
  • Compatible with Ø1/2" Optical Posts

The FCM Ferrule Clamp allows any connectorized fiber with a Ø2.5 mm ferrule to be mounted securely and compactly within an experimental setup. The fiber ferrule is clamped into the flexure mount using a 5/64" (2 mm) hex key. An 8-32 (M4) tapped hole on the bottom of the mount provides compatibility with our Ø1/2" optical posts.

Part Number
Description
Price
Availability
FCM
Post-Mountable Ø2.5 mm Ferrule Clamp, 8-32 Mounting Hole
$18.90
Today
FCM/M
Post-Mountable Ø2.5 mm Ferrule Clamp, M4 Mounting Hole
$18.90
Today