Hex Adjusters, 3/16"-120 Fine

  • Hex Adjusters, Bushings, and Knobs
  • 0.008" Travel Per Revolution
  • Adjuster Lengths from 0.375" to 2.00"







5/64" Hex Socket


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  • 120 TPI Fine Adjustment
  • Hex Adjusters Feature a 5/64" (2 mm) Hex Socket
  • Removable Adjustment Knobs Available for Hex Adjusters
  • Threaded Bushings and Lock Nuts for Threading Integration

These 3/16"-120 Adjuster Screws are manufactured to exact tolerances to ensure a smooth feel and excellent long-term stability; Thorlabs has developed a set of specifications that meet industry class 3 standards. All of our fine hex adjuster screws are made to these extremely tight tolerances and come lubricated to ensure smooth mating into compatible components. 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.

Threaded Bushing Application

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.

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.

Volume Pricing Discount
Contact Thorlabs

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 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
Our experienced, highly skilled machinists are running our on-site Citizen Swiss Screw Machines 24 hours a day, allowing us to produce high-volume custom and OEM orders. Each machine is capable of running unattended, producing one screw every 30 to 120 seconds. This flexibility allows us to fulfill multiple orders at once without sacrificing quality.

High Quality
Thorlabs inspects all of our fabricated precision screws and bushings after the initial fabrication process and right before packaging. All inspections adhere to the ANSI AQL1.5 acceptable quality level, which states that if a certain percentage, based upon the amount of product in a certain lot, does not meet specification, then the entire lot is not sold. This ensures that all customers receive the highest quality product every time and that all items will be of equal performance.

Precision Screw Production

Posted Comments:
Leonardo de Melo  (posted 2021-03-02 15:00:54.61)
Are there any motorized actuators for the 3/16"-120 adjusters?
asundararaj  (posted 2021-03-03 01:58:47.0)
Thank you for contacting Thorlabs. Unfortunately, we do not have a motorized actuator with the 3/16"-120 thread. Many of our motorized actuators have the 1/4"-80 Threads.
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3/16"-120 Fine Hex Adjusters

  • Six Lengths Available from 0.375" to 2.00"
  • 5/64" (2 mm) Hex Key Compatible
  • Max Load: 5 lbs (2.3 kg)
  • Material: DFARS-Certified Stainless Steel
    • Traceable Material Certification Available (Must be Requested at Time of Purchase)

Our high precision 3/16"-120 Fine Hex Adjusters can be adjusted with a 5/64" (2 mm) hex key, 3/16"-120 removable adjustment knob (sold below), or HKTS-5/64 hex key adjuster knob (sold below). The F19MS series adjusters have a maximum axial load capacity of 5 lbs (2.3 kg). These adjusters are constructed of 303 stainless steel and come 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 adjuster screws are designed to be used with 3/16"-120 threaded bushings, available below.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
F19MS038 Support Documentation
F19MS038Fine Hex Adjuster, 3/16"-120, 0.375" Long
F19MS050 Support Documentation
F19MS050Fine Hex Adjuster, 3/16"-120, 0.50" Long
F19MS075 Support Documentation
F19MS075Fine Hex Adjuster, 3/16"-120, 0.75" Long
F19MS100 Support Documentation
F19MS100Fine Hex Adjuster, 3/16"-120, 1.00" Long
F19MS150 Support Documentation
F19MS150Fine Hex Adjuster, 3/16"-120, 1.50" Long
F19MS200 Support Documentation
F19MS200Fine Hex Adjuster, 3/16"-120, 2.00" Long
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3/16"-120 Removable Adjustment Knobs

  • Use with 3/16"-120 Hex Adjusters
  • Clearance Hole Allows Access to Adjuster's Hex Socket
  • Available in 2 Sizes
  • Knurled Knob Increases Adjustment Sensitivity

The F19MSK1 and F19MSK1L Removable Adjustment Knobs thread onto our 3/16"-120 F19MS series 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 (Ø0.41") and large (Ø0.71").

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
F19MSK1 Support Documentation
F19MSK13/16"-120 Removable Adjuster Knob
F19MSK1L Support Documentation
F19MSK1LLarge-Diameter 3/16"-120 Removable Adjuster Knob
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3/16"-120 Threaded Bushing

  • Ideal for Slip Fit
  • Made from 510 Phosphor Bronze (Vacuum Rated for 10-6 Torr)
  • Recommended Bore Diameter: 0.242" +0.001"/-0.000"

The F19MSN1P threaded bushing is designed for slip fit applications, as the 3/16"-120 threading tolerances are too tight for press fit. The recommended bore diameter for this bushing is 0.242" +0.001"/-0.000". Each bushing is made of phosphor bronze in order to prevent damage to the fine adjusters. Compared to brass, phosphor bronze offers higher vacuum compatibility. 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
F19MSN1P Support Documentation
F19MSN1PThreaded Bushing, Phosphor Bronze, 3/16"-120, 0.34" Long
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3/16"-120 Lock Nut

  • Knurled Outside Diameter for Easy Tightening
  • Material: 510 Phosphor Bronze
  • Vacuum Compatible: 10-6 Torr

The LN19120 lock nut features a knurled outside diameter to make gripping the nut easier when loosening or tightening. The 0.15" (3.8 mm) thick 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LN19120 Support Documentation
LN191203/16"-120 Lock Nut
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5/64" Hex Key Adjusters

POLARIS-K1 with HKTS-5/64 Adjuster
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POLARIS-K1E with HKTS-5/64 Adjuster
  • For Convenient Adjustment of 5/64" and 2 mm Hex-Driven Actuators
  • Red Anodized Adjustment Knob with Engraved Hex Size
  • Replaceable Hex Tip
  • Sold in Packages of 4

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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
HKTS-5/64 Support Documentation
HKTS-5/64Customer Inspired! 5/64" (2 mm) Hex Key Thumbscrew, 4 Pack