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1/4"-100 Adjustment


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1/4

Features

  • 100 TPI Fine Adjustment
  • Hex Adjusters Feature a 5/64" Hex Socket
  • Removable Adjustment Knobs Allow for Adjustment without Hex Key
  • Threaded Bushings and Lock Nuts for Fine Adjuster Integration

Thorlabs offers 1/4"-100 hex adjuster that exceed class 3 standards. Each screw is individually tested with a master gauge set that ensures the inter-changeability of our adjuster screws and threaded bushings. A variety of 1/4"-100 components are available to simplify the integration of fine adjusters in your application. The fine adjusters come lightly lubricated to ensure smooth mating into compatible components.

We also offer Polaris™ Matched Adjuster/Bushing Pairs, which offer better adjustment stability and a smoother feel for smaller adjustment changes.

When assembling, apply a small amount of the Loctite adhesive to both threaded bushings and the mounting plate and ensure a uniform distribution of the adhesive around the perimeter of the parts before assembly. After insertion, remove any excess adhesive from around the part.

Threaded Bushing Application

The assembly process begins by producing the appropriate 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.

As shown in Figure 1, the flange on the mating bushing is designed to support the axial load of the screw and bushing assembly.
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1/4"-100 Hex Adjusters
1/4in-100 Hex Adjusters
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  Five Lengths Available from 0.5" to 2"
  5/64" Hex Key Compatible
  Max Load: 15 lbs (6.8 kg)

Our high precision 1/4"-100 Fine Hex Adjusters can be adjusted with a 5/64" hex key, F25USK1 removable adjustment knob (sold below), or HKTS-5/64 hex key knob (sold below). The F25US series have a maximum load of 15 lbs (6.8 kg)

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
F25US050 Support Documentation F25US050 Ultra-Fine Hex Adjuster, 1/4"-100, 0.50" Long $6.10
Today
F25US075 Support Documentation F25US075 Ultra-Fine Hex Adjuster, 1/4"-100, 0.75" Long $6.60
Today
F25US100 Support Documentation F25US100 Ultra-Fine Hex Adjuster, 1/4"-100, 1.00" Long $7.10
Today
F25US150 Support Documentation F25US150 Ultra-Fine Hex Adjuster, 1/4"-100, 1.50" Long $8.80
Today
F25US200 Support Documentation F25US200 Ultra-Fine Hex Adjuster, 1/4"-100, 2.00" Long $10.40
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1/4"-100 Threaded Bushings
1/4in-100 Threaded Bushings
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  Ideal for Slip Fit
  Two Lengths Available
  Material: 510 Phosphor Bronze (Vacuum Rated for 10-6 Torr)
  Recommended Bore Diameter: 0.340" +0.001/-0.000

Our 1/4"-100 Threaded Bushings are commonly used in slip fit applications where fine adjusters are needed. Due to the tolerances of our fine adjusters, we discourage press fitting this bushings. The recommended bore diameter for our 1/4"-100 bushings is 0.340" +0.001/-0.000.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
F25USN1P Support Documentation F25USN1P Threaded Bushing, Phosphor Bronze, 1/4"-100, 0.63" Long $7.70
Today
F25USN2P Support Documentation F25USN2P Threaded Bushing, Phosphor Bronze, 1/4"-100, 0.57" Long $7.70
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1/4"-100 Lock Nut
1/4in-100 Lock Nut
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  Knurled Outside Diameter for Easy Tightening
  Material: 510 Phosphor Bronze
  Vacuum Compatibility: 10-6 Torr

The LN25100 lock nut features a knurled outside diameter, which helps when tightening or loosening the nut. This 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/Imperial Price Available / Ships
LN25100 Support Documentation LN25100 1/4"-100 Lock Nut $8.20
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1/4"-100 Removable Adjustment Knobs
1/4in-100 Removable Adjustment Knobs
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100 TPI Knobs
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F25USK1 and F25USK2 Knobs are both Compatible with our Polaris Mounts
Item #Knob Diameter
F25USK1 0.58"
F25USK2 0.925"
  • Use with 1/4"-100 Hex Adjusters
  • Clearance Hole Allows Access to Hex Socket
  • Knurled Knob Increases Adjustment Sensitivity
  • Available in 2 Sizes (See Table to the Right)

These removable adjustment knobs are compatible with our 1/4"-100 adjusters, including those used in the Ø1" Polaris Kinematic Mounts. These knobs enable quick and easy tweaking of an actuator without needing a hex key.

We offer two sizes of adjustment knobs. The Ø0.58" standard size (F25USK1) is similar in size to the stainless steel knobs included with our Polaris mount, while the larger Ø0.925" size (F25USK2) provides additional angular resolution.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
F25USK1 Support Documentation F25USK1 Ø0.58" 1/4"-100 Removable Adjuster Knob $7.00
Today
F25USK2 Support Documentation F25USK2 Ø0.925" 1/4"-100 Removable Adjuster Knob $9.00
Today
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5/64" Hex Key Adjusters
5/64in Hex Key Adjusters
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POLARIS-K12AH with HKTS-5/64 Adjuster
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POLARIS-K1-2AH with HKTS-5/64 Adjuster
  • For Convenient Adjustment of 5/64" (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" (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 also offer hex key thumbscrews in other 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/Imperial Price Available / Ships
HKTS-5/64 Support Documentation HKTS-5/64 NEW! Customer Inspired! 5/64" (2 mm) Hex Key Thumbscrew (4 Pack) $22.50
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Additional Adjustment Screws
  • 6-80 Adjustment

  • 3/16"-100 Adjustment

  • 1/4"-80 Adjustment

  • 1/4"-100 Adjustment

  • Polaris™ 1/4"-100 Matched Adjuster/Bushing Pairs

  • M2.5 x 0.20 Adjustment

  • M3 x 0.20 Adjustment

  • M3 x 0.25 Adjustment

  • 1/4"-80 Screw with Differential Adjuster

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