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Hex Adjusters, M2.5 x 0.20 Fine
These M2.5 x 0.20 hex adjusters come lubricated for smooth mating with compatible components. The adjuster body is constructed of 303 stainless steel and the ball tip is constructed using 440 stainless steel that is fixed onto the adjuster using epoxy. The M2.5 x 0.20 threaded sleeve is manufactured on a super-precision CNC turning center using a single point threading tool. Removable adjustment knobs provide a way to make fine adjustment without the need of a hex key for the adjusters. Other M2.5 x 0.20 threaded components such as a threaded bushing and lock nuts are offered to simplify the integration of fine adjusters in your application. For detailed instructions on installing bushings, please see the Integration tab.
Integrating Fine Adjustment Screws Into Optomechanical Systems
The assembly process begins by producing the appropriately sized mating hole for the threaded bushing. Given the close fit between the threaded bushing and the mating adjuster screw, we caution against using a press fit to assemble these products. For our own production needs, we use a permanent anaerobic adhesive that provides excellent long-term performance.
We recommend using Loctite Anaerobic Adhesive product number 680 or equivalent. In order to ensure maximum strength between the bonded parts, we strongly urge the user to follow carefully the instructions provided by Loctite, which specify the amount of clearance between the threaded bushing and the mounting plate. The most common source of failure is not allowing for the proper clearance between the parts being bonded since this clearance provides for the proper volume of adhesive.
When assembling, apply a small amount of the Loctite adhesive to the threaded bushing only. Rotate the bushing as it is installed to ensure a uniform distribution of the adhesive. After insertion, remove any excess adhesive from around the part.
As shown in the figure to the right, the flange on the mating bushing is designed to support the axial load of the screw and bushing assembly.
OEM & Custom Precision Screws
Thorlabs manufactures custom and high volume OEM precision screws and bushings with various diameters, lengths, and threads. To inquire about custom or OEM precision screws, please contact Technical Support or use the "Contact Us" form to the right. A specialist will contact you within 24 hours or the next business day.
Precision Screw Capabilities
Thorlabs' in-house machine shop, located in Newton, NJ, gives us the ability to quickly produce large quantities of precision screws and bushings. We are equipped to manufacture screw diameters ranging from 2.5 mm to 20 mm with lengths up to 165 mm and a maximum thread pitch of 200 TPI. Our standard adjuster screw design has a hardened steel ball tip to provide a single point of contact; for other applications we are able to provide adjusters without the steel ball. Custom orders can be achieved on a case-by-case basis. For large orders of an item, Thorlabs passes on to the customer the cost savings associated with planned production of high volumes of that item. For more information on Thorlabs' discount pricing policy, click the "V" link to the right. We also offer a large variety of stock precision screws, which are available here.
Fast Turn-Around Times
Precision Screw Production
Our high precision M2.5 x 0.20 hex adjusters can be adjusted with a 1.5 mm hex key or M2.5 x 0.20 removable adjustment knob. While one end of each adjuster features a hex socket, the other end has a spherical tip, providing one point of contact for the adjuster. To maintain smooth adjustment, the maximum load of these adjusters is 4.5 kg (10 lbs).
These adjuster screws are designed to be used with M2.5 x 0.20 threaded bushings, available below. Alternatively, for more compact applications, an M2.5 x 0.20 plug tap can create M2.5 x 0.20 tapped holes in optomechanical components.
The F2D5ESK1 and F2D5ESK1L Removable Adjustment Knobs thread onto our M2.5 x 0.20 F2D5ES series hex adjusters to allow adjustment without the use of a hex key. This provides quick and easy adjustments for a broad range of applications. The adjuster knobs are available in two sizes: standard (Ø7.1 mm) and large (Ø14.7 mm).
Our M2.5 x 0.20 Threaded Bushings are commonly used in slip fit applications where fine adjusters are needed. Due to the tolerances of our fine adjusters, we strongly discourage press fitting these bushings. The recommended bore diameter for our M2.5 x 0.20 bushings is 4.0005 mm +0.0127 mm/-0.0000 mm. For vacuum applications, we recommend a thorough ultrasonic cleaning to remove any grease or particulates prior to use. To learn more about the use of fine adjustment screws and bushings in optomechanical systems, please see the Integration tab above.
The LN25M20 lock nut features a knurled outside diameter to make gripping the nut easier when loosening or tightening. The lock nut is made from 510 Phosphor Bronze, which is vacuum rated for 10-6 Torr. Each nut features blind holes that allow a hex key to be used to help tighten the lock nut.
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Two Collars Can be Locked Together to Create a Hard Stop
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A Single Locking Collar Can Lock an Adjuster in Position
These locking collars are compact alternatives to the lock nuts sold above. They are only 0.07" (1.7 mm) thick and are constructed of 303 stainless steel. They are compatible with all of the M2.5 x 0.20 adjusters sold on this page, as well as those used in our FiberBench and Post-Mountable Kinematic Tip/Tilt and Rotation Mounts.
As shown in the photos to the right, they can be used to lock an adjuster in a desired position, or to create a hard stop at any position to prevent overdriving an adjuster. In addition to using two collars to create a hard stop, as shown in the photo to the far right, a single collar can be epoxied to an adjuster using our G14250 epoxy to create a permanent hard stop. We recommend the SPW403 Spanner Wrench to install or remove these locking collars. The end of the SPW403 is machined to accept a 5/64" hex wrench, which can be used to provide additional torque. The hollow cylindrical construction of the SPW403 allows a tool to pass through the entire length of the spanner wrench and access the adjuster.