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Lab Jacks

  • 3 Sizes: Heavy Duty (L490), Compact (LJ750) & Mini (L200)
  • Each Model Offers Rugged, Dual Pantograph Design
  • Large Array of Mounting Holes on Each Platform

Application Idea



(One Included with Each Unit)







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Item # Vertical Travel Mounting Surface Max Load Capactiy
L490(/M) 2.26"
(57.4 mm)
7.00" x 4.00"
(177.8 mm x 101.6 mm)
75 lbs
(34.0 kg)
L200(/M) 1.03"
(26.2 mm)
3.00" x 4"
(76.2 mm x 101.6 mm)
50.0 lbs
(22.7 kg)
LJ750(/M) 1.00"
(25.4 mm)
(67.0 mm)
200 lbs
(90.7 kg)

Laboratory jacks provide a rugged, height adjustable platform ideal for mounting optomechanical sub-assemblies that, as a functional group, require height adjustment. In order to address a wide range of requirements, Thorlabs offers three different models, each with unique design characteristics suited for different ranges of end applications.

L490 Heavy Duty Lab Jack
The dual pantograph design of the L490 offers excellent rigidity and platform parallelism. The large 4.00" (101.6 mm) x 7.00" (177.8 mm) mounting platform supports up to 75 lbs (34 kg) with a smooth vertical adjustment range of 2.26" (57.4 mm) supported by stainless steel axles and connecting rods. Both the top and bottom plates offer a generous array of 1/4"-20 (M6) tapped holes and clearance slots for general mounting requirements.

L200 Mini Lab Jack
The L200 is designed with the same rigid dual pantograph design of our popular L490 above. The small design and array of 4-40 (M3) mounting holes makes it an ideal addition to our Mini-Series Construction products. The 3.00" (76.2 mm) x 4.00" (101.6 mm) mounting platform supports up to 50 lbs (22.7 kg) with a smooth vertical adjustment range of 1.03" (26.2 mm). Both top and bottom plates offer a wide range of mounting holes including 4-40 (M3), 8-32 (M4), and 1/4"-20 (M6) for general mounting requirements (see Support Drawing for more details).

LJ750 Compact Lab Jack
The LJ750 offers 1.00" (25.4 mm) of precision vertical adjustment in a compact, easy-to-operate design. The large actuator ring, graduated in 10 μm intervals, offers high sensitivity even when actuating its maximum load of 200 lbs (90.7 kg). The top platform offers an additional functionality with lockable, 360º continuously rotation.

L200 SmartPack Packaging
Click to Enlarge

L200 Packaging

Smart Pack

Item #% Weight
L490 41.27% 107.46 kg
L490/M 41.27% 125.75 kg
L200 13.21% 6.71 kg
L200/M 13.21% 7.19 kg
LJ750 27.98% 5.15 kg
LJ750/M 27.98% 9.60 kg

Smart Pack

  • Reduce Weight of Packaging Materials
  • Increase Usage of Recyclable Packing Materials
  • Improve Packing Integrity
  • Decrease Shipping Costs

Thorlabs' Smart Pack Initiative is aimed at waste minimization while still maintaining adequate protection for our products. By eliminating any unnecessary packaging, implementing packaging design changes, and utilizing eco-friendly packaging materials for our customers when possible, this initiative seeks to improve the environmental impact of our product packaging. Products listed above are now shipped in re-engineered packaging that minimizes the weight and the use of non-recyclable materials.b As we move through our product line, we will indicate re-engineered packages with our Smart Pack logo.

  • Travel-based emissions reduction calculations are estimated based on the total weight reduction of packaging materials used for all of 2013’s product sales, traveling 1,000 miles on an airplane, to provide general understanding of the impact of packaging material reduction. Calculations were made using the EPA’s shipping emissions values for different modes of transport.
  • Some Smart Pack products may show a negative weight reduction percentage as the substitution of greener packaging materials, such as the Greenwrap, at times slightly increases the weight of the product packaging.

Posted Comments:
xrb09126  (posted 2017-06-29 11:30:29.127)
For the L200/M labjack we are having problems with what it seems to be the adjuster rod where iis struggling to move the jack at all? Just wondering if you can help
tfrisch  (posted 2017-07-01 11:45:32.0)
Hello, thank you for contacting Thorlabs. I will reach out to you directly to troubleshoot your labjack.
dw  (posted 2017-03-22 16:59:11.467)
After some use, these lab jacks tend to get jammed. It would be very helpful to have some info as to how to take apart the lab jack and fix this.
jlow  (posted 2017-03-29 04:41:06.0)
Response from Jeremy at Thorlabs: Typically the common cause for the stage getting jammed is dirt contamination on the lead screw. If you move the stage until it is at the end of the upright position, you can access the leadscrew somewhat to clean it with solvents (e.g. isopropyl alcohol). Once the lead screw is clean, you can then regrease it. The grease we use on the lead screw is Apiezon M. Afterwards, run the lead screw back and forth fully a few times.
andrew  (posted 2013-07-23 06:32:01.503)
We own a L490/M. Can we add the motorized stage to it? L490MZ/M Motorized Lab Jack, 50.8 mm Travel, M6 Taps
cdaly  (posted 2013-07-25 10:34:00.0)
Response from Chris at Thorlabs: Thank you for using our feedback tool. I'm afraid I am not sure if you are asking these can be mounted together or if the manual stage can be turned into a motorized one, so I will answer both. No, unfortunately, the L490(/M) cannot be motorized by adding the controller afterwards. Yes, you would be able to mount one on top of the other. In a perpendicular or offset configuration, you can just use M6 (1/4-20) cap screws, but if you are mounting them together flush to one another, you would need also to use the corresponding nuts in order to fasten them.
rlang  (posted 2012-11-30 00:00:00.0)
The L490/M includes 19 M6 mounting holes manufactured with 25 mm spacing. The tapped holes each include a positional tolerance that would allow the spacing to range between 24.87 mm to 25.13 mm. Our apologies, but our supporting documentation is currently inaccurate and will be updated shortly. Thank you for pointing out this inconsistency, and please note that the L490/M will suit your application.
oleg.mavr  (posted 2012-11-28 11:17:17.123)
This product would be very useful to our company if it is really "METRIC" as it is mentioned in short description of L490/M: "The top and bottom plates each have an array of nineteen 1/4"-20 (M6) tapped mounting holes on 1" (25 mm) centers." However one can see 25.4 mm spacing between tapped mounting holes. Please clarify is it possible to order L490/M with 25.0 mm spacing?
tcohen  (posted 2012-05-14 09:34:00.0)
Response from Tim at Thorlabs: Thank you for contacting us. The L490 uses anodized aluminum and stainless steel almost exclusively. There are, however, a few steel components which may not be stainless. I am checking into this and will contact you with more details.
johannes.sparrer  (posted 2012-05-10 18:56:07.0)
Is the L490 completely made of stainless materials? I would like to use it in an environment with a high humidity.
eliseo  (posted 2010-06-01 00:04:15.0)
Do you have any experience in making the L200 UHV compatible? Would it be feasible to scrub out the lithium grease and replace with vacuum grease?
jjurado  (posted 2010-06-01 21:41:58.0)
Response from Javier at Thorlabs to eliseo: we currently do not offer a vacuum-compatible version of the L200 labjack. There is not only grease, but other components that would require a redesign of the assembly in order to make the L200 vacuum compatibe (~10^-6 Torr). Alternatively, I would suggest looking at our LNR series stainless steel stages. We could customize its mounting accesories for use in vacuum environments. I will contact you with more details.
apalmentieri  (posted 2010-01-27 10:00:00.0)
A response from Adam at Thorlabs to rick: This is a very interesting application and we would like some more information. I will email you directly to get this information. With respect to the grease, the L490 uses Apiezon grease while the L200 uses white lithium for moving parts and a combination of Apiezon grease with NYE PG-44A grease.
vvv  (posted 2010-01-26 16:47:55.0)
I have an application for the L490 and or L200. The lab jacks would be used in a radioactive hot cell. That only causes problems if some kind of solid bearing material is used. Most lubricants are Ok, if one is used; I need to run it through our system.Your help will be appreciated. rick
apalmentieri  (posted 2010-01-14 14:18:45.0)
A response from Adam at Thorlabs, Inc to Dan: I am sorry about the issue with our step files. We will update the web and send you out an accurate step file.
flickingerd  (posted 2010-01-14 11:44:53.0)
The STEP file thats available for L200 is flawed in a subtle but serious way. The hole spacings on the top and bottom plates are incorrect in one dimension. The holes, as modeled, are on a 1" x 25mm grid!
tyler  (posted 2008-03-06 09:33:44.0)
Response from Tyler at Thorlabs to ghegenbart: Thank you for bringing the missing drawings to our attention. They are now available. We are sorry for any inconvenience this may have caused you.
ghegenbart  (posted 2007-11-16 06:39:34.0)
Drawings for LJ750/M are missing.

Lab Jacks

Displacement Graph for L490 Lab Jack
Click to Enlarge
Displacement Per Turn for L490 Lab Jack
  • Convenient, Removable Actuator Knob Included
  • 2.26" (57.4 mm) Height Adjustment Range
  • 7.00" (177.8 mm) x 4.00" (101.6 mm) Mounting Surface
  • 75 lbs (34.0 kg) Vertical Load Capacity
  • 1/4"-20 (M6) Mounting Holes, 19 Locations
  • Top- and Bottom-Located Mounting Slots

The L490 Lab Jack utilizes a dual-pantograph design which offers excellent rigidity. The adjustment mechanism uses a lead screw to close the angle between the opposing pairs of supporting struts. Stainless steel axles and connecting rods allow loads of up to 75 lbs (34 kg) to be smoothly elevated over the full range of the L490. The top and bottom plates each have an array of nineteen 1/4"-20 (M6) tapped mounting holes on 1" (25 mm) centers. Mounting slots are provided on the top and bottom plates.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
L490 Support Documentation
L490Heavy Duty Lab Jack
+1 Qty Docs Part Number - Metric Price Available / Ships
L490/M Support Documentation
L490/MHeavy Duty Lab Jack - Metric

Mini Lab Jack

Displacement Graph for L200 Mini Lab Jack
Click to Enlarge
Displacement Per Turn for L200 Mini Lab Jack
  • Compatible with Mini-Series Breadboards and Components
  • 1.03" (26.2 mm) Height Adjustment Range
  • 3.00" (76.2 mm) x 4.00" (101.6 mm) Mounting Surface
  • 50 lbs (22.7 kg) Veritcal Load Capacity
  • Steel Leadscrew with 1/8" Hex Socket Height Adjuster (1/8" Hex Wrench Included)

The L200 Mini Lab Jack offers the same highly rigid dual-pantograph design as the L490 but in a smaller package size. The adjustment mechanism provides smooth vertical motion while supporting vertical loads of up to 50 lbs. The top and bottom plates each offer a generous supply of tapped holes and counterbores, adding to mounting flexibility. A steel leadscrew with 1/8" hex socket accessible from the rear of the unit actuates height adjustment. (One 1/8" hex wrench included with each unit).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
L200 Support Documentation
L2004" x 3" Mini Lab Jack
+1 Qty Docs Part Number - Metric Price Available / Ships
L200/M Support Documentation
L200/M4" x 3" Mini Lab Jack - Metric

Compact Lab Jack

  • High Stability Lab Jack
  • 1.00" (25.4 mm) Vertical Adjustment Range
  • Ø2.64" (67.0 mm) Mounting Surface
  • 200 lbs (90.7 kg) Static and Active Load Capacity
  • Parallel to Within ±0.005" Over Entire Range

The LJ750 is a compact vertical translation platform, 2" tall when fully collapsed, and 3" tall when fully extended. The large actuator knob is graduated in 10 µm increments allowing calibrated vertical height changes. 1/4"-20 (M6), 8-32 (M4), and 6-32 (M4) mounting holes are provided on the top platform. Additionally, the top platform can be rotated 360° and locked in place. A clamping arm (PM4, shown in the picture to the left) is supplied with the jack.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
LJ750 Support Documentation
LJ750Compact Lab Jack
+1 Qty Docs Part Number - Metric Price Available / Ships
LJ750/M Support Documentation
LJ750/MCompact Lab Jack - Metric

Clamping Arms

Click for Details

Mechanical Drawings
  • Provide Clamping Force for Our Platform Mounts
  • Threaded Hole on Top and Threaded Stud on Bottom of Post
    • 6-32 Threads on PM3 and PM4
    • 8-32 Threads on PM5
    • M4 Threads on All Metric Versions
  • Maximum Optic Heights from 0.97" to 1.65" (24.6 mm to 41.8 mm)
  • Extension Posts Available to Increase Max Optic Height
    • PM3SP(/M) with PM3(/M): Hold Optics up to 2.21" (56.1 mm) Tall
    • PM4SP(/M) with PM4(/M): Hold Optics up to 3.61" (91.7 mm) Tall

Click to Enlarge

Clamping Arm Extension Posts with Metric Indicator Groove

Thorlabs' Clamping Arms provide clamping force to secure optics to our kinematic platform mounts and V-clamps. The PM3(/M) accommodates optics up to 0.97" tall and features a 0.69" center-to-center distance between the post and the nylon-tipped setscrew that holds the optic. The PM4(/M) accommodates optics up to 1.61" and features a 1.16" center-to-center distance between the post and the nylon-tipped setscrew. The maximum optic height of the PM3(/M) or PM4(/M) Clamping Arms can be extended using our PM3SP(/M) or PM4SP(/M) Extension Posts, respectively. These extension posts are identical to the posts included in each complete clamping arm. Each clamping arm features 6-32 (M4) threads. The PM3 and PM4 can be mounted in 8-32 tapped holes by using the AS6E8E thread adapter, which features internal 6-32 threads and external 8-32 threads. The thread adapter is designed with the same outer diameter as these clamping arms and extension posts for seamless integration. 

The PM5(/M) clamping arm is made entirely from heat-treated stainless steel, which helps maintain stability in fluctuating temperatures and provides vacuum compatibility. This clamping arm is recommended for use with the POLARIS-K1M4(/M), but it can be used with any platform mount that has one or more 8-32 (M4) tapped holes. The PM5(/M) can hold optics up to 1.65" tall, and the distance from the post center to the contact point that holds the optic is 0.90".

Each clamping arm is attached to its post using a flexure mechanism that locks with a 5/64" (2.0 mm) balldriver or hex key. The setscrew on top of the clamping arm also accepts a 5/64" (2.0 mm) balldriver or hex key in order to clamp down on the optic. The post includes a through hole which can be leveraged for added torque when tightening down the post. Please see the diagram above for additional information.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PM3 Support Documentation
PM3Small Adjustable Clamping Arm, 6-32 Threaded Post
PM3SP Support Documentation
PM3SPCustomer Inspired! Extension Post for PM3 Clamping Arm, 6-32 Threaded
PM4 Support Documentation
PM4Large Adjustable Clamping Arm, 6-32 Threaded Post
PM4SP Support Documentation
PM4SPCustomer Inspired! Extension Post for PM4 Clamping Arm, 6-32 Threaded
PM5 Support Documentation
PM5Stainless Steel Adjustable Clamping Arm, 8-32 Threaded Post
+1 Qty Docs Part Number - Metric Price Available / Ships
PM3/M Support Documentation
PM3/MSmall Adjustable Clamping Arm, M4 Threaded Post
PM3SP/M Support Documentation
PM3SP/MCustomer Inspired! Extension Post for PM3/M Clamping Arm, M4 Threaded
PM4/M Support Documentation
PM4/MLarge Adjustable Clamping Arm, M4 Threaded Post
PM4SP/M Support Documentation
PM4SP/MCustomer Inspired! Extension Post for PM4/M Clamping Arm, M4 Threaded
PM5/M Support Documentation
PM5/MStainless Steel Adjustable Clamping Arm, M4 Threaded Post
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