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Lever-Actuated, SM-Threaded Iris Diaphragms


  • Compatible with Our Lens Tubes
  • Standard Lever Activation
  • Zero-Aperture and Stainless Steel Models Available

SM1D25

Internally
SM1-Threaded Iris

SM2D25

SM2-Threaded Iris

SM1D12SS

SM1-Threaded
Stainless Steel Iris

SM1D12

SM1-Threaded Iris

SM1L03

Lens Tube

SM1RC

Lens Tube
Slip Ring

Application Idea

Related Items


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Iris Selection Guide
Post-Mountable Irises
Unmounted Irises
SM-Threaded, Lever-Actuated Irises
SM-Threaded, Ring-Actuated Irises
Cage System Irises

Features

  • Lever-Actuated Design
  • SM1D12SS Iris with Stainless Steel Leaves for High-Power Applications
  • SM1D12SZ Iris with Zero Aperture Blocks All Incoming Light in Closed Position

Thorlabs offers lever-activated irises with compatible lens tube threading for use with our lens tube systems, SM-threaded mounts, and cage systems.

In addition, Thorlabs offers a line of Post-Mountable Irises, SM-Threaded Ring-Actuated Irises, Unmounted Irises, and Cage System Irises as well as mounted pinholes and slits.

Item # SM05D5 SM1D12 SM1D25 SM1D12SS SM1D12SZ SM2D25 SM3D50
Type Lever Actuated Lever Actuated Lever Actuated Lever Actuated,
Stainless Steel
Lever Actuated,
Zero Aperture
Lever Actuated Lever Actuated
Thread Standard SM05 (0.535"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM2 (2.035"-40) SM3 (3.035"-40)
Aperture (Min) Ø0.7 mm Ø0.8 mm Ø1 mm Ø1 mm Zero Ø1 mm Ø2 mm
Aperture (Max) Ø5 mm Ø12 mm Ø25 mm Ø11.9 mm Ø11.9 mm Ø25 mm Ø50 mm

Thorlabs' Threading Specifications

Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0, UNS-2A Internal Thread, 0.535"-40.0, UNS-2B
Max Major Diameter 0.5340" Min Major Diameter 0.5350"
Min Major Diameter 0.5289" Min Pitch Diameter 0.5188"
Max Pitch Diameter 0.5178" Max Pitch Diameter 0.5230"
Min Pitch Diameter 0.5146" Min Minor Diameter (and 83.3% of thread) 0.508"
Max Minor Diameter 0.5069" Max Minor Diameter (and 64.9% of thread) 0.514"
RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0, UNS-2A Internal Thread, 0.800"-36.0, UNS-2B
Max Major Diameter 0.7989" Min Major Diameter 0.8000"
Min Major Diameter 0.7934" Min Pitch Diameter 0.7820"
Max Pitch Diameter 0.7809" Max Pitch Diameter 0.7866"
Min Pitch Diameter 0.7774" Min Minor Diameter (and 83.3% of thread) 0.770"
Max Minor Diameter 0.7688" Max Minor Diameter (and 64.9% of thread) 0.777"
C-Mount Threading: Machine Vision LensesCCD/CMOS Cameras
External Thread, 1.000"-32.0, UN-2A Internal Thread, 1.000"-32.0, UN-2B
Max Major Diameter 0.9989" Min Major Diameter 1.0000"
Min Major Diameter 0.9929" Min Pitch Diameter 0.9797"
Max Pitch Diameter 0.9786" Max Pitch Diameter 0.9846"
Min Pitch Diameter 0.9748" Min Minor Diameter (and 83.3% of thread) 0.966"
Max Minor Diameter 0.9651" Max Minor Diameter (and 64.9% of thread) 0.974"
SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0, UNS-2A Internal Thread, 1.035"-40.0, UNS-2B
Max Major Diameter 1.0339" Min Major Diameter 1.0350"
Min Major Diameter 1.0288" Min Pitch Diameter 1.0188"
Max Pitch Diameter 1.0177" Max Pitch Diameter 1.0234"
Min Pitch Diameter 1.0142" Min Minor Diameter (and 83.3% of thread) 1.008"
Max Minor Diameter 1.0068" Max Minor Diameter (and 64.9% of thread) 1.014"
SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5x0.5 Internal Thread, M30.5x0.5
Max Major Diameter 30.480 mm Min Major Diameter 30.500 mm
Min Major Diameter 30.371 mm Min Pitch Diameter 30.175 mm
Max Pitch Diameter 30.155 mm Max Pitch Diameter 30.302 mm
Min Pitch Diameter 30.059 mm Min Minor Diameter (and 83.3% of thread) 29.959 mm
Max Minor Diameter 29.938 mm Max Minor Diameter (and 64.9% of thread) 30.094 mm
SM1.5 Threading: Ø1.5" Lens Tubes
External Thread, 1.535"-40, UNS-2A Internal Thread, 1.535"-40, UNS-2B
Max Major Diameter 1.5339" Min Major Diameter 1.535"
Min Major Diameter 1.5288" Min Pitch Diameter 1.5188"
Max Pitch Diameter 1.5177" Max Pitch Diameter 1.5236"
Min Pitch Diameter 1.5140" Min Minor Diameter (and 83.3% of thread) 1.508"
Max Minor Diameter 1.5068" Max Minor Diameter (and 64.9% of thread) 1.514"
SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0, UNS-2A Internal Thread, 2.035"-40.0, UNS-2B
Max Major Diameter 2.0338" Min Major Diameter 2.0350"
Min Major Diameter 2.0287" Min Pitch Diameter 2.0188"
Max Pitch Diameter 2.0176" Max Pitch Diameter 2.0239"
Min Pitch Diameter 2.0137" Min Minor Diameter (and 83.3% of thread) 2.008"
Max Minor Diameter 2.0067" Max Minor Diameter (and 64.9% of thread) 2.014"
SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0, UNS-2A Internal Thread, 3.035"-40.0, UNS-2B
Max Major Diameter 3.0337" Min Major Diameter 3.0350"
Min Major Diameter 3.0286" Min Pitch Diameter 3.0188"
Max Pitch Diameter 3.0175" Max Pitch Diameter 3.0242"
Min Pitch Diameter 3.0133" Min Minor Diameter (and 83.3% of thread) 3.008"
Max Minor Diameter 3.0066" Max Minor Diameter (and 64.9% of thread) 3.014"

Posted Comments:
Rick Young  (posted 2019-06-20 18:36:19.34)
Where is the 'plane' of the iris/aperture itself referenced to whatever (one side)? None of the drawings I looked at specify this measurement ...!
YLohia  (posted 2019-06-21 11:27:56.0)
Hello, thank you for contacting Thorlabs. The distance between the surface of the externally SM2 threaded side and the iris plane is 4.75mm for the SM2D25. This information can be found in the Solidworks model.
user  (posted 2019-04-04 05:41:59.82)
Hi, We recently purchased two of these irises from you. We don't seem to be able to use the locking screw to stop the lever from moving once it's in the position we want. We tried a variety of allen keys and the one that best fit was 0.03in/0.75mm. We tried looking at the CAD drawing but all it says is "locking screw". Could you tell me what the correct allen key should be? Thanks, Chris
mmcclure  (posted 2019-04-04 08:12:07.0)
Hello, thank you for your question. The setscrew located on the housing of each iris is not a locking mechanism. Rather, this setscrew helps to hold the internal aperture mechanism within the mounting ring. We will provide this information on the webpage presentation to avoid future confusion.
user  (posted 2017-03-22 13:50:34.42)
Irises with max apertures of 75mm and 100mm would be very useful.
swick  (posted 2017-03-23 05:20:25.0)
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. We offer irises with max. aperture 75mm. The item name would be ID75Z: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=206 At the time we do not offer an iris with aperture of 100mm as standard item. I would like to check if we can offer a customized version for you. As you did not left any contact details, please contact techsupport@thorlabs.com
syim  (posted 2016-05-13 16:02:46.317)
Hello, It would be helpful that you have zero aperture iris of 25 mm max aperture diameter. Could I get a custom item?
shallwig  (posted 2016-05-13 08:34:48.0)
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry, we offer zero aperture post mounted Iris diaphragms with 25mm max aperture (ID25Z) and our standard Iris diaphragms without mounting holes are also available with 25mm max aperture, the part number is D25SZ. I have contacted you directly to check if one of these is suitable for you.
ludoangot  (posted 2016-02-17 09:30:00.037)
Hello, it would have been good to explicitly specify that for zero aperture irises, the dual leaf design actually means two aperture planes. At least I wasn't aware that your dual leaf design implied there's 2 apertures and they are not coplanar. Such a design is not desired when the location of the aperture plane is critical such as in some telecentric systems.
jlow  (posted 2016-02-25 11:08:41.0)
Response from Jeremy at Thorlabs: Thank you for the feedback. We will make this information clearer on the website.
grovyle  (posted 2015-04-14 13:14:44.963)
I have a SM1T1 stuck on a SM1D12. I want to submerge the whole thing in WD40 and sonicate it. Afterward, rinse it with an organic solvent. I need to know if the iris is only metal or it has plastic parts that can be damaged this way. I tried to lose it mechanically buy can make more pressure without risking destroying the iris or the tube. Do you have any suggestions on how to separate them. I'm deciding between keep trying or just leave the tube permanently stuck on the iris.
shallwig  (posted 2015-04-22 05:37:15.0)
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. The iris lever is made from stainless steel, the fins are made from hoop steel while the housing is made from anodized aluminum, there are no plastic parts used. There is also grease attached to guarantee smooth aperture settings. Normally it should be possible to lose the SM1D12 from the SM1T1 mechanically, I will contact you directly to troubleshoot this problem in more detail.
tomerg  (posted 2014-05-18 10:12:42.683)
Can you please provide the mechanical tolerance on the external diameter of the SM1D25 iris? its nominal diameter is given (40.6mm) in the drawing, but for my application the tolerance is required as well. Thanks.
cdaly  (posted 2014-05-22 10:55:35.0)
Response from Chris at Thorlabs: Thank you for your inquiry. I will contact you directly with this value.
tomerg  (posted 2014-04-07 08:24:56.213)
Good morning, Regarding the iris SM1D25: is there an option to lock the aperture at a certain opening after initial adjustment? Thanks, Tomer.
cdaly  (posted 2014-04-08 07:44:53.0)
Response from Chris at Thorlabs: Thank you for your inquiry. The SM1D25 aperture does not have a locking mechanism. There is a set screw on the bottom, which looks like it may be, but after inspection of the part, it is clear this is used only for assembly purposes, holding the internal aperture mechanism itself within the mounting ring at a fixed angle.
christophe.yamahata  (posted 2013-12-10 10:33:35.167)
Would it be possible to order iris diaphragms SM05D5 without the Thorlabs marking? The arrow symbol is very useful, but Thorlabs's logo is not desired for our commercial product.
jlow  (posted 2013-12-18 08:47:05.0)
Jeremy Low: Response from Jeremy at Thorlabs: We could definitely do this as a custom for you. I will get in contact with you directly on getting a quote set up.
technicalmarketing  (posted 2008-07-28 22:58:46.0)
Hallo, We will work on new drawings of the Iris Diaphragms right now. For SM1D12SZ the distance between the leaves is 2.35 mm. The distance from the mounting surface on the side with the external threads to the first set of leaves is 3 mm. Inge@thorlabs.com
blecompte  (posted 2008-07-23 12:46:33.0)
Do you have a 3d solid model of the SM1D12SZ yet? Or can you tell me the location of the iris leaves relative to the mounting surface?

SM05-Threaded, Lever-Actuated Iris Diaphragm

SM05D5 Diagram
Click to Enlarge

SM05D5 Mechanical Diagram
  • SM05 (0.535"-40) Threaded on Both Sides
  • Lever-Controlled, Ø0.7 mm - Ø5 mm Aperture
  • Black Spring Steel Leaves

The SM05D5 lever-actuated iris diaphragm is SM05-threaded for compatibility with our Ø1/2" lens tubes and other SM05-threaded accessories. The housing features an engraved arrow which indicates the direction the lever must be moved to close the aperture. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components.

The setscrews on the housing retain the internal aperture mechanism within the housing and should not be adjusted.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM05D5 Support Documentation
SM05D5SM05 Lever-Actuated Iris Diaphragm (Ø0.7 - Ø5 mm)
$74.40
Today

SM1-Threaded, Lever-Actuated Iris Diaphragms

  • SM1 (1.035"-40) Threaded on Both Sides
  • Lever-Controlled, Max Aperture up to Ø25 mm
  • Black Spring Steel and Stainless Steel Leaf Versions Available
  • Zero-Aperture Version Available

These lever-actuated iris diaphragms are SM1-threaded for compatibility with our Ø1" lens tubes and other SM1-threaded accessories. The housing of each iris features an engraved arrow which indicates the direction the lever must be moved to close the aperture.

Our SM1D12 and SM1D25 iris diaphragms offer maximum apertures up to Ø12 mm and Ø25 mm, respectively. The SM1D12 iris has internal SM1 threading on one side and external SM1 threading on the other side (see drawing to the right). Our SM1D25 iris has internal SM1 (1.035"-40) threading on both sides of the housing (see drawing to the right) as well as a full Ø25 mm aperture.

The SM1D12SS iris features stainless steel leaves for use in higher power applications than traditional spring steel irises. The aperture can be continuously varied from the maximum aperture diameter of 11.9 mm to a minimum aperture diameter of 1.0 mm. The lever-activated diaphragm is designed to provide smooth operation for several thousand cycles. An engraved arrow indicates the position the lever must be in to close the iris. We use a magnetic stainless steel in this iris. Due to its hardness, it offers a longer lifetime than typical non-magnetic stainless steel. This iris also has internal SM1 (1.035"-40) threading on one side and external SM1 threading on the other.

The SM1D12SZ zero-aperture iris diaphragm is continuously variable from the maximum aperture diameter of 11.9 mm to completely closed (zero aperture). Our zero-aperture design achieves a completely closed aperture by utilizing two sets of steel leaves mounted in two adjacent planes. The iris leaves are made from black spring steel and the lever-activated diaphragm is designed to provide smooth operation for several thousand cycles. These irises feature an engraved arrow on the housing which indicates the direction the lever must be moved to close the aperture. As the aperture gets smaller, it also becomes slightly elliptical due to the design of the iris. This housing has internal SM1 (1.035"-40) threading on one side and external SM1 threading on the other.

The setscrews on the housings of these irises retain the internal aperture mechanism within the housing and should not be adjusted.

SM1D12 Diagram
Click to Enlarge

SM1D12 Mechanical Diagram
SM1D25 Diagram
Click to Enlarge

SM1D25 Mechanical Diagram
SM1D12SS Diagram
Click to Enlarge

SM1D12SS Mechanical Diagram
SM1D12SZ Diagram
Click to Enlarge

SM1D12SZ Mechanical Diagram
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1D12 Support Documentation
SM1D12SM1 Lever-Actuated Iris Diaphragm (Ø0.8 - Ø12 mm)
$61.68
Today
SM1D25 Support Documentation
SM1D25Customer Inspired! SM1 Lever-Actuated Iris Diaphragm (Ø1 - Ø25 mm)
$95.77
5-8 Days
SM1D12SS Support Documentation
SM1D12SSSM1 Lever-Actuated Stainless Steel Iris Diaphragm (Ø1 - Ø11.9 mm)
$76.29
Today
SM1D12SZ Support Documentation
SM1D12SZSM1 Lever-Actuated Zero Aperture Iris Diaphragm, Ø11.9 mm Max Aperture
$78.73
Today

SM2-Threaded, Lever-Actuated Iris Diaphragm

SM2D25 Diagram
Click to Enlarge

SM2D25 Mechanical Diagram
  • SM2 (2.035"-40) Threaded on Both Sides
  • Lever-Controlled, Ø1 mm - Ø25 mm Aperture
  • Black Spring Steel Leaves

The SM2D25 lever-actuated iris diaphragm is SM2-threaded for compatibility with our Ø2" lens tubes and other SM2-threaded accessories. The housing features an engraved arrow which indicates the direction the lever must be moved to close the aperture. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components.

The setscrews on the housing retain the internal aperture mechanism within the housing and should not be adjusted.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2D25 Support Documentation
SM2D25SM2 Lever-Actuated Iris Diaphragm (Ø1 - Ø25 mm)
$100.37
5-8 Days

SM3-Threaded, Lever-Actuated Iris Diaphragm

SM3D50 Diagram
Click to Enlarge

SM3D50 Mechanical Diagram
  • SM3 (3.035"-40) Threaded on Both Sides
  • Lever-Controlled, Ø2 mm - Ø50 mm Aperture
  • Black Spring Steel Leaves

The SM3D50 lever-actuated iris diaphragm is SM05-threaded for compatibility with our Ø3" lens tubes and other SM3-threaded accessories. The housing features an engraved arrow which indicates the direction the lever must be moved to close the aperture. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components.

The setscrews on the housing retain the internal aperture mechanism within the housing and should not be adjusted.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM3D50 Support Documentation
SM3D50SM3 Lever-Actuated Iris Diaphragm (Ø2 - Ø50 mm)
$194.78
Today
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