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1/4"-80 Fine Hex Adjusters
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The KM100 Mirror Mount uses the F25SS100 adjuster screws sold below. It is shown here with LN2580 Lock Nuts and F25SSK1-RED Red Knobs.
Thorlabs has developed a set of specifications for adjusters and related accessories that exceed the industry class 3 thread tolerance standard by as much as 30%. All of our fine hex adjuster screws are made to these extremely tight tolerances. Each screw is individually tested with a master gauge set that ensures the interchangeability of our adjuster screws and threaded bushings.
If you are incorporating any of these components into larger optomechanical systems, please ensure that the specifications for any mating parts you are manufacturing have the appropriate tolerances. For more details, 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. The recommended bore diamaters can be found with the product information for each bushing sold below. 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. Locking bushings with nuts do not require adhesive as they are held in place by the locking nut.
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 1/4"-80 Fine Hex Adjusters can be adjusted with a 5/64" (2.0 mm) hex key, 1/4"-80 removable adjustment knobs (sold below), or HKTS-5/64 hex key knobs (sold below). The F25SS series adjusters have a maximum axial load capacity of 15 lbs (6.8 kg). The adjuster body is constructed of 303 stainless steel and comes pregreased to ensure smooth mating into compatible components. The ball tip is constructed using 440 stainless steel that is fixed onto the adjuster using epoxy.
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F25ST adjusters include side holes for fine adjustments with a 5/64" (2.0 mm) balldriver.
These high precision 1/4"-80 Fine Hex Adjusters feature two side through holes for a 5/64" (2.0 mm) hex key or balldriver as well as an end-located 5/64" (2.0 mm) hex socket. The side holes provide the user with a method for more precise adjustments. These adjusters can also be adjusted with HKTS-5/64 hex key knobs (sold below), but they are not compatible with standard 1/4"-80 removable adjustment knobs.
The F25ST series adjusters have a maximum axial load capacity of 15 lbs (6.8 kg). The adjuster body is constructed of 303 stainless steel and comes pregreased to ensure smooth mating into compatible components. The ball tip is constructed using 440 stainless steel that is fixed onto the adjuster using epoxy.
These high precision 1/4"-80 Fine Adjustment Screws are similar to the adjusters sold above, but with a knob permanently installed on one end. The non-slip knurled Delrin®† knob improves adjustment sensitivity. Our FAS series adjusters have a maximum axial load capacity of 15 lbs (6.8 kg). The adjuster body is constructed of 303 stainless steel and comes pregreased to ensure smooth mating into compatible components. The ball tip is constructed using 440 stainless steel that is fixed onto the adjuster using epoxy.
†Delrin® is a registered trademark of Dupont Polymers, Inc.
Our 1/4"-80 threaded phosphor bronze bushings are commonly used in slip fit applications where fine adjusters are needed. The recommended bore diameter for our 1/4"-80 bushings is 0.3395" +0.0005"/-0.0000". The longer bushing (F25SSN1P) allows for increased stability, while the shorter bushing (F25SSN2P) can be used when space is a constraint. The 510 Phosphor Bronze material is also vacuum compatible for 10-6 Torr; prior to use in vacuum applications, we recommend a thorough ultrasonic cleaning to remove any grease or particulates. Due to the tolerances of our fine adjusters, we discourage press fitting these bushings. Please see the Integration tab for more information.
These 1/4"-80 threaded to Ø3/8" barrel adapters are made from 510 Phosphor Bronze (vacuum rated for 10-6 torr). They allow our 1/4"-80 adjusters to be used with linear translation stages that accept actuators with Ø3/8" (Ø9.5 mm) barrels. The photo to the right shows an adjuster screw used as a replacement for the actuator included with the translation stage. For vacuum applications, we recommend a thorough ultrasonic cleaning to remove any grease or particulates prior to use.
These 1/4"-80 threaded bushings are made from 510 Phosphor Bronze (vacuum rated for 10-6 torr) and include a removable nut with a 1/2" hex. They can be mounted in a clearance hole, using the 1/2" hex nut to lock them into place. Adjusters installed in these bushings can be locked in place via a 2-56 setscrew using a 0.035" (0.9 mm) hex key. For vacuum applications, we recommend a thorough ultrasonic cleaning to remove any grease or particulates prior to use.
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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 0.05" (1.1 mm) thick and are constructed of 303 stainless steel. They are compatible with all of the 1/4"-80 adjusters sold on this page, as well as those used in many of our mirror mounts and stages.
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 SPW402 Spanner Wrench to install or remove these locking collars.
Our F25SSK1 and F25SSK1L removable aluminum adjustment knobs thread onto our 1/4"-80 F25SS series hex adjusters, which can be found on many of our kinematic mounts, and allow for the use of an adjuster without a hex key. This provides quick and easy adjustments for a broad range of applications. We offer two sizes of adjustment knobs. Our standard size (F25SSK1) has a 0.58" diameter, while our larger size (F25SSK1L) has a 0.83" diameter.
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F25SSK1S has a small diameter and includes side holes for adjustment with a 5/64" (2.0 mm) hex key.
Our F25SSK1S Low-Profile, Removable Adjustment Knobs thread onto our 1/4"-80 F25SS series hex adjusters, which can be found on many of our kinematic mounts, and allow for the use of an adjuster without a hex key. This provides quick and easy adjustments for a broad range of applications. In addition, these knobs feature six equally spaced actuation holes along the outer diameter of the knob that can be engaged with a 5/64" (2.0 mm) balldriver or hex key, as shown in the image to the right. The side holes provide the user with a method for more precise adjustments and allow the user an easier method of turning the knob when access to the knob is limited in an experimental setup. The small diameter (Ø0.35") of this knob also allows kinematic mounts, such as the KS1, to be attached directly to an optical table or breadboard, as shown in the image to the right.
These color-coded aluminum knobs thread onto the 1/4"-80 F25SS series hex adjusters (found on our KM and KS series kinematic mounts) and allow for the use of an adjuster without a hex key. This provides quick and easy adjustments for a broad range of applications. These knobs are interchangeable, and the variety of anodized colors available allows the user to easily tag and identify certain mounts in the setup. They are available in packages of 10 knobs, except for the F25SSK1-MULTI, which is a package of 16 (2 of each color).
These 5/64" Hex Key Adjuster Thumbscrews allow for quick adjustment of many 5/64" and 2 mm hex-driven actuators (or standard actuators with the knobs removed). These temporary knobs can be left in the screw's hex socket between adjustments for convenience (see photo to the right). An 8-32 setscrew (5/64" hex) secures the replaceable hex bit, which can be reversed if the tip is stripped. Contact Tech Support to order replacement hex key bits.
We offer hex key thumbscrews in sizes from 0.050" to 3/16" and 2 mm to 5 mm.