HTRH75R Rotational Post Holder with 75 mm Rod Length

Overview

The HTRH75R Rotational Post Holder is a precision-engineered optical mounting solution designed for stable, repeatable, and angularly adjustable positioning of optical components in laboratory and industrial alignment setups. Built upon the fundamental principle of coaxial rotational constraint—where a rigid rod is secured within a bearing-supported housing that permits full 360° azimuthal rotation without axial or lateral drift—the HTRH75R ensures mechanical stability while enabling fine angular orientation control. Its core architecture integrates a high-tolerance radial ball bearing between the rotating and fixed housings, minimizing play (< 5 arcmin total indicator reading under 1 kg load) and delivering consistent kinematic behavior across repeated adjustments. The device is optimized for integration into modular optical tables, breadboards, and cage systems where deterministic repositioning of mirrors, lenses, waveplates, or fiber couplers is required without compromising beam path integrity.

Key Features

• Dual independent locking system: separate clamping mechanisms for both the 75 mm stainless steel mounting rod and the rotational housing—ensuring zero slippage during long-term experiments or vibration-prone environments.
• Precision-ground ball bearing interface (ABEC-5 grade) between rotating and stationary sections, enabling smooth, backlash-free 360° continuous rotation with angular repeatability ≤ ±0.1°.
• Integrated neodymium N52 magnetic base (12 mm diameter, 4.5 kG surface field) for rapid, tool-free attachment to ferromagnetic optical tables; includes removable non-magnetic aluminum adapter plate for compatibility with non-ferrous surfaces.
• Anodized 6061-T6 aluminum construction provides corrosion resistance, thermal stability (CTE: 23.6 µm/m·K), and dimensional consistency across ambient lab conditions (15–30 °C).
• Standard M4 threaded holes (depth 6 mm) on all four lateral faces support auxiliary bracketing, sensor mounting, or integration with Thorlabs-compatible SM1-threaded accessories.

Sample Compatibility & Compliance

The HTRH75R accommodates standard Ø12.7 mm (1/2″) optical posts and accepts rods up to Ø12.7 mm with nominal length of 75 mm. It maintains mechanical compatibility with ISO-standard optical rail systems (e.g., 30 mm × 30 mm groove pitch) and adheres to dimensional conventions defined in DIN 3180 and ANSI/OEOSC OP1.002. All manufacturing processes conform to ISO 9001:2015 quality management requirements. While not certified for medical or aerospace applications, its design meets general-purpose laboratory equipment expectations under IEC 61000-6-3 (EMC emissions) and IEC 61000-6-2 (immunity). No hazardous substances are used per RoHS Directive 2011/65/EU.

Software & Data Management

As a purely mechanical adjustment component, the HTRH75R does not incorporate electronic sensors, actuators, or embedded firmware. Consequently, it requires no driver installation, firmware updates, or software configuration. Angular position tracking must be performed externally using calibrated goniometers, rotary encoders (e.g., Renishaw RESOLUTE™), or vision-based metrology systems. For traceable alignment documentation, users may integrate the mount into LabVIEW- or Python-controlled motion platforms via third-party motorized rotation stages (e.g., Thorlabs K10CR1 paired with HTRH75R as passive reference stage). Audit trails for manual adjustments fall under user-defined GLP/GMP documentation protocols.

Applications

• Laser cavity alignment: precise angular tuning of end mirrors and output couplers in CW and pulsed solid-state laser systems.
• Polarization control: mounting of half-wave or quarter-wave plates with reproducible fast-axis orientation relative to incident beam direction.
• Fiber collimator positioning: iterative optimization of coupling efficiency between single-mode fibers and free-space optics.
• Interferometric setup stabilization: supporting retroreflectors or beam splitters in Michelson or Mach–Zehnder configurations where thermal drift compensation relies on mechanical rigidity.
• Education labs: hands-on demonstration of rotational degrees of freedom, torque transmission, and static load distribution in undergraduate optics and photonics courses.

FAQ

Is the magnetic base safe for use near sensitive electronic equipment?
Yes—provided separation distance exceeds 50 mm from devices such as digital multimeters, oscilloscopes, or magnetic storage media. The base’s field decays rapidly (inverse cube law); field strength at 100 mm is < 10 G, well below typical interference thresholds.
Can the HTRH75R be used in vacuum environments?
Not without modification: standard anodization and adhesive-backed rubber feet are not UHV-compatible. For vacuum use, request optional bare-aluminum finish and dry-lubricated bearings (specify vacuum grade upon order).
What is the maximum recommended torque for the rotation lock screw?
Do not exceed 0.4 N·m (3.5 in·lb); over-torquing may deform the aluminum housing and impair bearing alignment.
Does the rod clamp accommodate metric and imperial-diameter rods interchangeably?
The standard clamp is sized for Ø12.7 mm (1/2″) rods. Adapters for Ø6.35 mm (1/4″) or Ø25.4 mm (1″) rods are available as optional accessories (part numbers HTRH-ADP-6M and HTRH-ADP-25M).
Is calibration documentation provided with each unit?
No factory calibration certificate is included, as the device is a passive mechanical mount. Users requiring traceable angular verification should employ external metrology tools per ISO/IEC 17025-accredited procedures.