Robot Wrist Joint Pin

Name: Hardened Robot Wrist Joint Pin for Arms – Frigate
Price: 249.00 USD
Availability: InStock

Robot Wrist Joint Pin plays a structural role in handling the dynamic loads imposed by complex robotic arm kinematics, especially at the wrist where multi-axis articulation generates combined torsional, bending, and radial forces. The pin is subjected to high-frequency load reversals, necessitating materials with superior endurance limits such as maraging steel, PH stainless, and titanium Grade 5. Cross-sectional geometry of the Robot Wrist Joint Pin is optimized to resist moment-induced distortion, ensuring reliable axis alignment under cyclic conditions without loss of stiffness or rigidity.

Material

Alloy Steel (4140, hardened), Tool Steel (D2), Stainless Steel (17-4PH)

Dimensional Tolerances

Bearing/Bushing Fit – g6 (ISO 286); General Shaft – h7

Length Tolerance

Per 100mm – ±0.05 mm; Overall – ±0.1 mm

Straightness

Per 100mm – ≤0.01 mm; Overall – ≤0.02 mm

Surface Finish

Bearing Surfaces – Ra ≤0.2 µm (superfinish); General – Ra ≤0.4 µm

Product Description

Robot Wrist Joint Pin directly influences the positional accuracy and repeatability of end-effector operations due to its critical placement within the wrist’s rotational axis. Deviations in cylindricity, concentricity, or form accuracy can cause angular drift and backlash in servo-driven joints. To prevent this, the Robot Wrist Joint Pin is manufactured with TIR values under 3 microns, with profile tolerances held to ISO Grade 4 or better. The resulting fit between mating components eliminates misalignment propagation and supports high-resolution actuation without geometric stack-up errors.

Hardness/Heat Treatment

Core – 30-35 HRC (toughness); Surface – 58-62 HRC (case-hardened, 0.5-1.5mm depth)

End Features

Retaining Grooves – ±0.02 mm width; Chamfers – 15°–45° (per ISO 13715)

Concentricity

OD-to-OD – ≤0.005 mm TIR; Groove Runout – ≤0.01 mm

Burr-Free Requirement

Fully Deburred (ISO 13715 compliant); Edge Radius – 0.1–0.3 mm

Certification Standards

ISO 286-1 (Tolerances), DIN 6325 (Pins), ISO 9001:2015, RoHS/REACH Compliant

Technical Advantages

Robot Wrist Joint Pin must maintain stable surface interactions under oscillatory motion, often in partially lubricated or high-contact-pressure interfaces. Surface degradation mechanisms such as galling, fretting, or adhesive wear are controlled through the use of low-friction, wear-resistant coatings like DLC (Diamond-Like Carbon) and CrN applied via PVD. Plasma nitriding is also applied to the Robot Wrist Joint Pin to produce a hardened case (depth ≥ 0.4 mm) with a hardness >1000 HV, minimizing frictional losses and extending the operational life of the rotational interface under high-cycle stress.

Robot Wrist Joint Pin operates in environments with elevated thermal gradients and potential exposure to corrosive media such as welding fumes, cleaning chemicals, or coolant aerosols. The selection of heat-resistant alloys—such as Inconel 718, A286 stainless, or hardened 440C—is based on application-specific thermal loads and ambient conditions. The Robot Wrist Joint Pin surface is passivated or coated to resist oxidation and pitting, meeting ASTM B117 corrosion benchmarks and retaining structural integrity at temperatures up to 500°C, depending on alloy and treatment.

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Industry Applications

Automotive Welding Robots

Supports high-frequency wrist articulation under thermal and mechanical loads during continuous spot welding and seam tracking operations.

Electronics Assembly Systems

Ensures micron-level repeatability in high-speed pick-and-place robots handling delicate PCB components with complex wrist rotation sequences.

Aerospace Fastening Robots

Provides precise axis control for torque-based joint fastening applications requiring consistent angular positioning and load path accuracy.

Medical Device Handling Robots

Enables sterile, backlash-free wrist rotation in cleanroom robotic systems managing sensitive surgical or diagnostic instrumentation.

Logistics and Warehousing Arms

Maintains rotational stability in robotic wrists performing repetitive high-cycle bin picking, orientation correction, and dynamic item sorting.

Food Processing Automation

Resists corrosion and fretting wear in washdown-tolerant wrist joints used for slicing, sorting, or packaging food-grade materials.

Dimensional Compatibility and Interchangeability

Robot Wrist Joint Pin is machined with high precision—covering length, diameter, shoulder location, and end geometry—to ensure seamless assembly without tolerance mismatches. Conforming to ISO 286 classes, each pin is available in both metric and imperial sizes for drop-in fit with systems from ABB, Fanuc, KUKA, and Yaskawa. Custom geometries support retrofit use where non-standard alignment or shoulder features are required.

Robot Wrist Joint Pin comes with full documentation including serial tracking, material certifications, inspection records, and thermal treatment logs. CAD and STEP files are provided for digital twin modeling and simulation. Manufacturing complies with ISO 9001 and AS9100, with optional NDT, microstructure validation, and surface integrity analysis for critical applications.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure CNC Robot Wrist Joint Pins are interchangeable with multiple OEM robotic systems?

Frigate manufactures CNC Robot Wrist Joint Pins with strict adherence to ISO 286 and DIN dimensional standards. Each pin is modeled in CAD with reference to OEM shaft and housing tolerances, including metric and imperial geometries. CMM inspection confirms form, position, and orientation across the shaft, shoulder, and grooves. This ensures the pins can be installed without rework in robotic wrists from ABB, FANUC, Yaskawa, and KUKA.

What materials does Frigate use for CNC Robot Wrist Joint Pins in high-load robotic environments?

Frigate typically uses 42CrMo4, EN24, and AISI 9310 for CNC Robot Wrist Joint Pins, selected for their toughness and fatigue strength. All materials are vacuum-degassed and come with 3.1 material certificates. Pins used in dynamic applications are heat treated to a core hardness of 38–42 HRC while maintaining surface hardening up to 60 HRC. Metallurgical testing is conducted to ensure the absence of inclusions or micro-cracks.

How does Frigate verify surface integrity in wear zones of Robot Wrist Joint Pins?

Frigate uses non-contact profilometry and stylus-type roughness testers to measure Ra and Rz in bearing and journal zones. Typical surface finish is maintained at Ra ≤ 0.3 µm to minimize friction and reduce bushing wear. Pins are also tested using eddy current inspection for surface cracks post grinding. These steps ensure smooth rotation and longer service intervals under high-cycle robotic articulation.

Does Frigate provide failure analysis and reverse engineering for worn Robot Wrist Joint Pins?

Yes, Frigate offers detailed failure analysis using SEM imaging, hardness mapping, and metallographic cross-sections. Reverse engineering is performed using 3D scanning, CAD modeling, and material characterization including spectroscopy and microhardness testing. This allows Frigate to recreate discontinued or undocumented CNC Robot Wrist Joint Pins with dimensional and mechanical fidelity. Root-cause reports are provided to prevent repeat failures in the field.

How does Frigate manage dimensional variation across production lots for CNC Robot Wrist Joint Pins?

Frigate maintains dimensional consistency using SPC (Statistical Process Control) and batch-wise gauge R&R studies. Each CNC Robot Wrist Joint Pin undergoes automated inspection with digital records stored for traceability. Tool paths are locked and verified using calibrated tool setters and in-process probing. This ensures ±5 µm tolerance repeatability across all production runs for the same part number.

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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

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