Light-Emitting Diode (LED) Mounts

  • Fixed Mounts for TO-18, TO-18R, TO-39, TO-46, and T1-3/4 LEDs
  • Lens Tube and Post Mounting Options
  • Socket for T1-3/4 LEDs


Post Mount for TO-18, TO-18R, and T1-3/4 LEDs


SM1-Threaded Mount
for LEDs


Shown with T1-3/4 LED


LED Socket Shown
with T1-3/4 LED

LED630E Red LED in LEDMT1F Mount

Application Idea


USB-Powered LED Mount, 51 Ω Resistor

Related Items

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Mounts for TO Can Diodes
  Compatible Packages
Laser Diode
Ø5.6 mm, Ø9 mm,
TO-38, TO-46, TO3
LED Mounts T1-3/4, TO-18, TO-18R
TO-39, TO-46
Socket Selection Guide
Laser Diodes
Light Emitting Diodes


  • USB-Powered Mount for LEDs in T-1 3/4 Packages
  • Passive LED Mounts for TO-18, TO-18R, T-1 3/4, TO-39, and TO-46 LED Packages
  • Beryllium Copper LED Socket

Thorlabs offers post-mountable and SM-threaded mounts for light emitting diodes (LEDs) in a variety of LED packages and mounting configurations. The USB-Powered LED Mounts are available for our LEDs in T-1 3/4 packages and provide both mounting to SM05-threaded (0.535"-40) components. The LEDMF passive mount is compatible with TO-18, TO-18R, and T1-3/4 unmounted LEDs and allows them to be mounted on our Ø1/2" Posts. SM05-threaded (0.535"-40) and SM1-threaded (1.035"-40) passive mounts are available for LEDs in TO-18, TO-39, TO-46, and T1-3/4 packages; these SM-threaded mounts allows LEDs to be used in a wide variety of SM05- or SM1-compatible optomechanics, including our Kinematic Mounts, Lens Tubes, XY Translating Mounts, 16 mm Cage Plates (SM05 compatible), and 30 mm Cage Plates (SM1 compatible).

Mounts are also available for TO can laser diodes as well as fiber-pigtailed laser diodes.

LED Temperature Warning
Please note that these diode mounts do not have any temperature regulation or temperature measurement capability, which only makes them suitable for LEDs that do not require active cooling. For our selection of heatsink-mounted, high-power LEDs, please click here. Running an LED at a high operating temperature can significantly shorten its lifetime.

Posted Comments:
David Mikolas  (posted 2023-06-03 08:42:14.233)
I love the Thorlabs catalog! :-) According to the tech support response to CAS-561960-Q3C0L4 the S1LEDM (SM1-Threaded Mount for LEDs) will also mount several InGaAs photodiodes (e.g. FD10D & FD05D: TO-18, FDGA05: TO-46) and yet I had to write to tech support to find this out. Consider adding links on the photodiode pages that let users know explicitly that they can use the S1LEDM to integrate their bare photodiodes into cage and tube systems. Thanks!
ksosnowski  (posted 2023-06-05 10:26:22.0)
Hello David, thanks for reaching out to Thorlabs. We appreciate this insight and we are working to add these notes to the LED mount page. However yes the passive LED mounts are suitable for photodiodes also as long as the photodiode matches the TO-format size listed.
cbrideau  (posted 2018-06-12 07:57:02.623)
A version of this with a socket on the backside to plug in your own through-hole resistor would be useful for DIY builders. You could probably squeeze the holes in above the USB connector.
YLohia  (posted 2018-06-14 10:31:14.0)
Hello, thank you for your valuable feedback. I will post this on our internal engineering forum.
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USB-Powered LED Mounts

Input Voltage (VI) 5 V
Resistance 51 Ω 62 Ω
Compatible LED Package T-1 3/4a
Mounting Thread External SM05 (0.535"-40)
Outer Dimensions Ø0.70" x 0.83"
Compatible LEDsb LED370E

  • LEDs with three pins and the LEDWE-15 are not compatible with the powered LED mounts.
  • LEDs compatible with a lower resistance mount will typically work with a higher resistance mount but with decreased output power.

Click for Details
LEDMT1E Mechanical Schematic

Click to Enlarge
LEDMT1E Electrical Schematic
  • USB-Powered Mount for LEDs in T-1 3/4 Packages
  • Options with Built-In 51 Ω or 62 Ω Current-Limiting Resistor for Different Electrical Requirements
  • External SM05 (0.535"-40) Mounting Thread
  • Includes Micro-B USB to USB Type-A Cable for Power LED Module

These USB-Powered LED Mounts provide both power and a mounting socket for our unmounted LEDs in T-1 3/4 packages within a single compact housing. Because of the varied electrical requirements, we offer the LED mounts with either a 51 Ω or 62 Ω current-limiting resistor. The module is powered via the micro-B USB port on the back of the housing which can be connected to a USB power source or PC via the included USB to micro-B USB cable. The housing exterior features external SM05 (0.535"-40) threading which can be used to integrate these mounts with a cage system or SM05-threaded component.

When mounting an LED, use the engraving on the housing to determine the appropriate length to cut the leads (see drawing to the right). Insert the LED with the anode lead going into the socket indicated by a (+) sign and the cathode into the socket indicated by a (-) sign. Use light force to mount the LED as excessive force may bend the electrode leads.

These powered mounts offer a fixed resistance and input voltage; choosing the appropriate mount for your LED will minimize damage to the LED. In general, a mount with a lower resistance value will increase the forward current available to the LED and proportionally increase the optical output power. However, the forward current must not exceed the maximum current of LED as this can cause permanent damage to the LED. The minimum mount resistance (R) recommended to use a desired LED is given by the following equation:

where the input voltage of the mount (VI,Source) is 5 V and the typical forward voltage (VF,Typ) and maximum forward current (IF,Max) are properties of each LED. Please consult the specifications of your LED for these values. 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LEDMT1E Support Documentation
LEDMT1ECustomer Inspired! USB-Powered LED Mount, 51 Ω Resistor
LEDMT1F Support Documentation
LEDMT1FCustomer Inspired! USB-Powered LED Mount, 62 Ω Resistor
7-10 Days
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LED Mounts

LED Mount Compatibility
Item # LED Package External
Spanner Wrenches
Mount LED
Retaining Ring
LEDMF TO-18, TO-18R,
and T-1 3/4a 
Smooth Bore N/A N/A
S05LEDM TO-18, TO-39,
TO-46, and
T-1 3/4a
  • The LEDRGBE, LEDGR, and LEDRY are not compatible with the LEDMF, S05LEDM, and S1LEDM, as the lead spacing prevents them from being mounted.

The LEDMF LED Mount is designed to hold any of Thorlabs' TO-18R packages directly or our T-1 3/4 or TO-18 packages using one of the included adapter rings (Ø4.7 mm adapter for TO-18 or Ø5 mm adapter for T-1 3/4). The LED is secured in the mount with a top-located cap screw with a 5/64" (2 mm) hex. The L-shaped mount has a counterbored through hole suitable for an 8-32 (M4) cap screw so that the LEDMF can be attached to a Ø1/2" Post.

The S05LEDM and S1LEDM LED Mounts are SM05 (0.535"-40) and SM1 (1.035"-40) threaded, respectively. They are designed to hold any of Thorlabs' TO-18, TO-39, TO-46, or T-1 3/4 packages using the included adapter rings. The external threading on these mounts allows them to be used in a wide variety of SM05- or SM1-compatible optomechanics.

To aid in threading the retaining ring into the mount or in threading the mount into a mating component, we recommend using our selection of spanner wrenches. The SPW801 Adjustable Spanner Wrench can be used to thread LED retaining rings into the mount and the mount into a mating component. Alternatively, the table to the right also lists the compatible fixed spanner wrench for each mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LEDMF Support Documentation
LEDMFØ1/2" Post-Mountable LED Mount for TO-18, TO-18R, and T-1 3/4 LEDs
S05LEDM Support Documentation
S05LEDMCustomer Inspired! SM05-Threaded Mount for TO-18, TO-39, TO-46, or T-1 3/4 LEDs
S1LEDM Support Documentation
S1LEDMSM1-Threaded Mount for TO-18, TO-39, TO-46, or T-1 3/4 LEDs
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LED Socket

Conductor Beryllium Copper (BeCu)
Insulator PTFE
Compatible Lead Diameters 0.015" - 0.025"
(0.38 mm - 0.64 mm)
Compatible Lead Lengths ≤0.15" (3.8 mm)
Outer Diameter 0.25" (6.4 mm)
Substrate Thickness 0.27" (6.9 mm)

Click to Enlarge
8060-2C Socket Schematic

Thorlabs offers a light-emitting diode (LED) socket that is compatible with LEDs that have two leads. This socket fits LED leads that are Ø0.015" - Ø0.025"(Ø0.38 - Ø0.64 mm) and ≤0.15" (3.8 mm) long. The socket has gold-plated beryllium copper contacts and meets RoHS compliance. Color varies by lot and may be white, off white, black, or tan.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
8060-2C Support Documentation
8060-2CNEW!Light-Emitting Diode Socket for LEDs, 2 Pin
Lead Time