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" (100 mm) x 7" (180 mm) mounting platform supports up to 75 lbs (34 kg) with a smooth vertical adjustment range of 2.2" (56 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" (76 mm) x 4" (102 mm) mounting platform supports up to 50 lbs (22 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" (25 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 kg). The top platform offers an additional functionality with lockable, 360º continuously rotation.

Item #	% Weight Reduction	% CO₂ Reduction
LJ750 (LJ750/M)	65%	67%
L200 (L200/M)	24%	46%

Revised L200 Packaging,
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Thorlabs' Green Initiative is aimed at reducing waste. To that end, we have begun to re-engineer our product packaging. Products listed above are now shipped in re-engineered packaging that minimizes the use of non-recyclable materials.

Over the course of a year, the re-engineered packaging across our product line is projected to reduce our CO₂ footprint by more than 16,184 kg and reduce packaging by over 13,893 pounds! As we move through our product line, we will label re-engineered packages with our green Smart Pack sticker (above).

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Posted Comments:

Poster: rlang

Posted Date: 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.

Poster: oleg.mavr

Posted Date: 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?

Poster: tcohen

Posted Date: 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.

Poster: johannes.sparrer

Posted Date: 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.

Poster: jjurado

Posted Date: 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.

Poster: eliseo

Posted Date: 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?

Poster: apalmentieri

Posted Date: 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.

Poster: vvv

Posted Date: 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

Poster: apalmentieri

Posted Date: 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.

Poster: flickingerd

Posted Date: 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!

Poster: tyler

Posted Date: 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.

Poster: ghegenbart

Posted Date: 2007-11-16 06:39:34.0

Drawings for LJ750/M are missing.

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