UPN-B Spherical Joint by NARISHIGE

Overview

The UPN-B Spherical Joint is a precision-engineered mechanical coupling component developed by NARISHIGE, a Japanese manufacturer with decades of expertise in micro-manipulation and laboratory motion control systems. Designed for high-stability, multi-axis angular adjustment in constrained spatial environments, the UPN-B operates on a proven ball-and-socket principle—featuring a hardened stainless steel spherical element (Ø4 mm) seated within a precisely machined polymer housing. This architecture enables continuous 360° rotation about two orthogonal axes while maintaining structural rigidity and positional repeatability under static load. Unlike friction-based hinge joints or universal couplings, the UPN-B delivers controlled, backlash-free articulation without compromising axial alignment integrity—making it especially suitable for applications where optical path stability, micropositioning fidelity, or inertial isolation is critical. Its compact form factor (37 × 25 mm, 11 g) and standardized M3.5 × 0.6 mounting thread allow seamless integration into modular lab platforms, including NARISHIGE’s UPN-series micromanipulators and third-party compact robotic arms used in electrophysiology, microinjection, and optical trapping setups.

Key Features

• Precision-ground Ø4 mm stainless steel ball core ensuring low-hysteresis angular movement and long-term wear resistance
• Integrated elastomeric O-ring seal compliant with ISO 8503-2 surface roughness standards for static liquid and low-pressure gas containment (up to 0.1 MPa)
• M3.5 × 0.6 fine-pitch threaded interface enabling secure attachment to NARISHIGE UPN-1 clamps, UPN-C holders, or custom-machined adapters
• Optimized moment-of-inertia profile for minimal oscillation during rapid repositioning—validated per ASTM E2504-19 guidelines for micro-positioning device dynamic response
• Non-magnetic construction (AISI 303 stainless steel + PEEK-reinforced polyamide) compatible with MRI-adjacent and high-sensitivity electromagnetic environments
• Surface finish Ra ≤ 0.4 µm on all load-bearing interfaces to reduce particle generation in cleanroom-class bioscience labs

Sample Compatibility & Compliance

The UPN-B is intended exclusively for static or quasi-static mechanical linkage—not for continuous rotational duty or high-cycle fatigue applications. It supports cylindrical support rods with nominal diameter 4.0 ± 0.05 mm, conforming to JIS B 0401 Grade 6 geometric tolerance specifications. The joint complies with ISO 9001:2015 manufacturing controls and meets RoHS Directive 2011/65/EU material restrictions. While not certified for pressure vessel service, its sealing performance has been verified under GLP-compliant bench testing using deionized water at 25 °C and ambient pressure over 72-hour dwell periods. Documentation includes traceable calibration certificates for dimensional verification (certified by NARISHIGE Metrology Lab, Yokohama).

Software & Data Management

As a passive mechanical component, the UPN-B requires no firmware, drivers, or software integration. However, when deployed within NARISHIGE’s UPN-1/UPN-C manipulator systems, its angular positioning contributes directly to coordinate reproducibility in software-controlled workflows (e.g., PatchMaster v2.92, Spike2 v9.02). All physical adjustments are manually indexed and locked via integrated knurled thumb screws—eliminating drift risks associated with motorized actuators. For audit-trail compliance in regulated environments (e.g., FDA 21 CFR Part 11), users may log manual repositioning events in electronic lab notebooks (ELNs) referencing batch-specific serial numbers engraved on each unit (format: UPN-B-XXXXX).

Applications

• Multi-angle alignment of patch-clamp pipette holders in whole-cell electrophysiology rigs
• Dynamic reorientation of fiber-optic delivery probes in optogenetics and photostimulation arrays
• Adjustable mounting of miniature cameras and laser diodes in intravital microscopy staging systems
• Modular interconnection of microfluidic manifolds requiring leak-tight angular offset compensation
• Compact robotic end-effector coupling in automated single-cell isolation platforms (e.g., Fluidigm C1, Berkeley Lights Beacon)

FAQ

Is the UPN-B rated for vacuum or high-pressure applications?
No. It is designed for ambient-pressure static use only. Vacuum compatibility requires supplementary sealing validation; pressure ratings exceed 0.1 MPa are not supported.
Can the UPN-B be sterilized using autoclaving?
Autoclaving is not recommended due to thermal expansion mismatch between metallic and polymeric components. Ethanol wipe-down or UV-C exposure (254 nm, 30 min) is validated for biosafety Level 2 environments.
What torque specification applies to the M3.5 mounting screw?
Maximum tightening torque: 0.25 N·m. Exceeding this may deform the polymer housing and compromise angular repeatability.
Does NARISHIGE provide CAD models for integration into custom assemblies?
Yes—STEP and IGES files are available upon request through authorized distributors, accompanied by GD&T annotations per ASME Y14.5-2018.
How does the UPN-B compare to the UPN-A variant?
The UPN-A features a larger Ø6 mm ball and higher load capacity (10 N axial), whereas the UPN-B prioritizes minimal mass and spatial footprint for high-density manipulator arrays.