1/4"-100 Matched Adjuster/Bushing Pairs and Accessories

• Threads with Better than Class 3 Fit Prevent Alignment Drift
• 0.75" or 1" Long with 100 Threads per Inch (TPI)
• Usable up to 200 °C and Vacuum Compatible down to 10^-9 Torr
• Adjust Using a 5/64" Hex Key or HKTS-5/64 Hex Adjuster Knob (Available Below)
• Phosphor Bronze Bushing with Stainless Steel Adjuster

These matched actuator/bushing pairs are tightly toleranced for smooth adjustment and long-term stability. The bushing should be mounted in a bore with a diameter of 0.350" +0.002"/-0.000".

The P25SB100L matched adjuster/bushing pair includes an unmounted ball bearing, providing the option to freely mount the ball or to secure it with epoxy to the tip of the screw. All other matched adjuster/bushing pairs are sold with the ball mounted using our 353NDPK High-Temperature Epoxy, which enables constant performance up to 200 °C and can be used in a vacuum environment down to 10^-9 Torr. The P25SB075V and P25SB100V matched adjuster/bushing pairs are also assembled in a clean environment and double vacuum bagged to eliminate contamination when transported into a cleanroom, making them the ideal choice for vacuum applications.

• Lock Nut Compatible with the 1/4"-100 Adjusters Sold Above
• Also Compatible with the Adjusters Included on our Polaris Mounts for Ø1" Optics
• Tighten Using a 13 mm Hex Thin-Head or Cone Wrench
• 0.08" (1.9 mm) Thick

The POLARIS-LN1 stainless steel lock nut can be used with any 1/4"-100 adjuster for long-term stability and features a 13 mm hex. This lock nut is compatible with Polaris mounts that have 1/4"-100 adjusters, excluding the piezo-driven mounts, mounts with low-profile adjusters, and vertically driven mounts. The adjuster can be held in place with an adjuster thumbscrew or hex key while lightly tightening the lock nut by hand or with a 13 mm thin-head wrench or cone wrench.

For applications that require frequent tuning of the adjusters, the lock nuts only need to be lightly tightened by hand to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench. To avoid cross threading the lock nut, place it against the adjuster and "unscrew" the lock nut until you feel a slight drop; then thread the lock nut onto the adjuster.

Cleanroom and Vacuum Compatibility
This lock nut is compatible with cleanroom and vacuum applications. The lock nut is chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface. After passivation, it is double vacuum bagged to eliminate contamination when transported into a cleanroom.

• Compact Locking Collar: Ø0.33" (Ø8.4 mm), 0.08" (1.9 mm) Thick
• Use One Collar To Lock an Adjuster to a Bushing
• Use Two Collars to Create a Hard Stop on an Adjuster
• Install and Remove with the POLARIS-T2 Spanner Wrench

The POLARIS-LNS1 locking collar is a compact alternative to the lock nut sold above. This locking collar is compatible with all of the 1/4"-100 adjusters sold on this page, as well as those used in many of our mirror mounts and stages. This locking collar is compatible with Polaris mounts that have 1/4"-100 adjusters, excluding the piezo-driven mounts and mounts with low-profile adjusters. Each collar is only 0.08" (1.9 mm) thick and constructed of stainless steel. We recommend the POLARIS-T2 Spanner Wrench to install or remove these locking collars. A center through hole allows a 2 mm ball driver to pass through the spanner wrench, so that the adjuster can be held in position while the locking collar is engaged.

The locking collar 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. For applications that require frequent tuning of the adjusters, the locking collar only needs to be lightly tightened to a torque of approximately 4 to 8 oz-in (0.03 to 0.06 N·m). For long term stability, we recommend tightening to a torque of 32 oz-in, which can be achieved by using our TW13 preset torque wrench in combination with the POLARIS-T2 wrench. To avoid cross threading the locking collar, place it against the adjuster and "unscrew" the collar until you feel a slight drop; then thread the collar onto the adjuster.

Cleanroom and Vacuum Compatibility
This locking collar is compatible with cleanroom and vacuum applications. The locking collar is chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface. After passivation, it is double vacuum bagged to eliminate contamination when transported into a cleanroom.

Sapphire Contact Pads
P25SK2 Sapphire Contact Pads are used in our Polaris Mirror Mounts because they improve the adjustment precision and durability of the mount. They are highly durable, scratch resistant, and ideal for thermally demanding applications. Sapphire is the material of choice for very demanding applications that require reliability and strength at both high and low operating temperatures. A sapphire-to-steel interface has a very low coefficient of friction, which allows for very smooth movement. With exceptional surface hardness, sapphire can be scratched by only a few substances other than itself. It is chemically inert and insoluble to water, common acids, or alkalis for temperatures up to ~1000 °C.

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POLARIS-K1E2 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.

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F25USK1 and F25USK2 Knobs Shown Attached to a POLARIS-K1E Mirror Mount

• 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.

Please note that these knobs are not compatible with Polaris mounts that use side-hole adjusters. The recessed bore of the knob is not deep enough to allow the knob to engage the threads on the side-hole adjuster.