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MT Series 1.1″ Telecentric Lens — Fastener Dimension Gauging
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23mm Sensor Telecentric Lens — Aerospace Bolt Profile Inspection
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Telecentric Lens for 3D AOI — Fastener Surface Defect Detection
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T Series Long WD Telecentric Lens — In-Line Fastener Assembly QC
View Details ›Aerospace fasteners — bolts, rivets, nuts, screws, and pins — are safety-critical components where dimensional deviations of even a few micrometers can trigger catastrophic structural failure. Conventional machine-vision lenses introduce perspective error and magnification shift with object distance, making them unsuitable for precision metrology. Telecentric macro lenses eliminate these distortions by accepting only parallel chief rays, delivering orthographic projection with constant magnification across depth.
When inspecting a titanium hex-head bolt for an aircraft wing assembly, the thread pitch, shank diameter, head height, and bearing surface flatness must all be measured simultaneously in a single image frame. A telecentric macro lens maintains true orthographic projection regardless of part height variation, ensuring that every dimensional measurement is traceable to SI units without software-based correction factors. This is not a convenience feature — it is a certification requirement under AS9100D and NADCAP audit standards.
Maintains fixed magnification even when the object distance varies by ±several millimeters, critical for measuring fasteners on non-flat fixture surfaces in automated assembly lines.
Achieves measurement repeatability down to ±0.5 µm for thread pitch and shank diameter verification, meeting MIL-SPEC, ASTM F606, and aerospace OEM supplier quality requirements.
Compatible with high-frame-rate industrial cameras (up to 8K line scan), enabling 100% inspection at production throughput rates exceeding 1,200 fasteners per minute on modern assembly lines.
Resolves surface cracks, thread deformation, missing coatings, and dimensional non-conformance that are invisible to conventional lenses, reducing escape rate to near-zero levels.
C-mount and M42 interfaces with standard industrial camera compatibility. Works with structured light, coaxial illumination, and multi-spectral lighting setups for multi-mode inspection.
Precision-engineered optical barrel with low thermal expansion coefficient maintains calibration stability in factory environments from 10°C to 50°C, critical for aerospace production floors.
The global aerospace fastener market exceeded USD 9.2 billion in 2024 and is projected to surpass USD 14 billion by 2030, driven by commercial aircraft production ramp-ups, defense modernization programs, and next-generation spacecraft development. Every single fastener in this supply chain requires dimensional verification — creating an enormous and growing demand for high-precision optical inspection systems.
From raw material receiving inspection to final assembly verification, telecentric macro lens systems are deployed across every stage of the aerospace fastener lifecycle. Below are the most demanding and commercially significant inspection scenarios where telecentric optics deliver decisive performance advantages.
High-strength titanium and Inconel bolts used in wing spars, fuselage frames, and landing gear assemblies require simultaneous measurement of shank diameter, thread pitch, head geometry, and grip length to tolerances as tight as ±5 µm. Telecentric macro lenses with 0.1× to 0.5× magnification and large depth of field enable multi-feature measurement in a single image, eliminating the need for multiple gauging stations and reducing cycle time by up to 60% compared to contact CMM methods.
NASA, ESA, and commercial launch providers such as SpaceX and Rocket Lab impose zero-defect mandates on all structural fasteners. Telecentric imaging systems integrated with AI-based anomaly detection algorithms provide fully traceable inspection records for each fastener, supporting AS9102 First Article Inspection (FAI) documentation and enabling digital thread traceability from raw material to final installation.
Incorrect thread form on a single fastener in a jet engine mount can result in improper torque-to-clamp-load conversion, leading to joint loosening under vibration. Telecentric macro lenses combined with structured illumination resolve thread root radius, flank angle, and pitch diameter simultaneously at inspection speeds exceeding 500 parts/minute, enabling 100% outgoing quality control at fastener manufacturers supplying Tier 1 aerospace OEMs.
Aerospace fasteners receive specialized coatings — cadmium plating, GEOMET®, Teflon-Lok, and dry film lubricants — to prevent galvanic corrosion in mixed-metal assemblies. Telecentric macro lenses in multi-spectral configurations detect coating voids, blistering, contamination, and thickness non-uniformity across the entire fastener surface, replacing time-consuming manual visual inspection with automated, objective, and repeatable assessment.
In automated fastener installation systems for aircraft panel assembly, telecentric vision systems verify fastener head seating depth, flushness relative to the skin surface, and absence of installation damage in real time. Integration with robotic installation arms and MES systems enables closed-loop quality control where non-conforming fasteners are immediately flagged and the installation tool is automatically adjusted.
During aircraft heavy maintenance events, tens of thousands of fasteners are removed, inspected, and either re-used or replaced. Telecentric macro lens systems enable rapid automated re-certification of removed fasteners against original dimensional specifications, replacing slow manual micrometer inspection and dramatically reducing aircraft ground time — a critical operational and economic factor for airlines and MRO providers.
The convergence of advanced manufacturing, AI-driven quality systems, and digital twin technology is reshaping how aerospace fastener inspection is conceived, deployed, and scaled. Telecentric macro lens technology is at the center of this transformation.
Deep learning models trained on millions of labeled fastener images are being deployed to detect micro-cracks, surface anomalies, and dimensional deviations that challenge even expert human inspectors. However, the accuracy of these AI systems is fundamentally limited by the quality of the input image data. Telecentric macro lenses, by providing geometrically accurate, distortion-free images with consistent illumination response, serve as the essential optical foundation that makes AI-based defect detection reliable enough for aerospace certification.
Next-generation fastener designs for composite airframe applications — including countersunk titanium Hi-Lok pins, blind rivets with complex tail-form geometries, and swaged collar fasteners — demand true 3D dimensional verification rather than 2D silhouette measurement. Telecentric lens arrays combined with structured light projection and photometric stereo techniques are enabling full 3D point-cloud reconstruction of fastener geometry at production line speeds, a capability that was previously available only in offline metrology laboratories.
Aerospace OEMs and regulatory bodies are mandating digital traceability for every safety-critical fastener from raw material certification through final installation and in-service inspection. Telecentric vision systems are being integrated with blockchain-based traceability platforms and digital twin models, where each inspection image and measurement result is cryptographically linked to a specific fastener's unique identifier, creating an immutable quality record that supports lifetime structural monitoring and accident investigation.
The push toward autonomous aircraft assembly and maintenance is driving demand for compact, lightweight telecentric macro lenses that can be mounted on collaborative robots and inspection drones. These miniaturized telecentric systems must maintain full metrology-grade performance while surviving the vibration, temperature cycling, and electromagnetic interference environments of an active manufacturing floor or aircraft hangar, driving significant innovation in lens barrel materials, anti-vibration mounting, and integrated calibration systems.
Emerging applications in hydrogen embrittlement detection, stress corrosion cracking identification, and coating chemistry verification are driving development of multi-spectral telecentric macro lenses that operate across UV, visible, and near-infrared wavelengths simultaneously. These systems enable fastener inspection capabilities that go far beyond dimensional measurement, providing material condition assessment that supports predictive maintenance and life extension programs for aging aircraft fleets.
Choosing the optimal telecentric macro lens for an aerospace fastener inspection application requires careful analysis of four primary parameters: working distance, magnification ratio, sensor format compatibility, and telecentricity specification (object-side, image-side, or bilateral).
For high-throughput inline inspection of standard fastener types (M3–M16 range), a magnification of 0.1× to 0.3× with a working distance of 100–300mm typically provides the best balance between field of view, resolution, and depth of field. Larger fasteners such as structural bolts for wing assembly may require 0.05× magnification with extended working distances up to 500mm.
Object-side telecentricity is the critical specification for dimensional measurement applications — the telecentric angle should be less than 0.1° to ensure that magnification variation across the depth of field is below the measurement uncertainty budget. Bilateral telecentric designs offer additional advantages in applications where both object and image distances vary, such as zoom-capable inspection systems.
Sensor format compatibility is increasingly important as aerospace inspection systems adopt large-format sensors (1.1″, 4/3″, and full-frame) to maximize the number of fastener features captured per image frame. Canrill Optics' telecentric lens range covers sensor formats from 1/2″ through 1.1″ with matched optical performance, ensuring that resolution and contrast are maintained across the full sensor area without vignetting or field curvature artifacts.
Illumination compatibility is another critical selection factor. Aerospace fastener inspection applications use a wide variety of illumination techniques — coaxial bright-field for surface finish and coating inspection, dark-field ring illumination for edge detection and thread form measurement, and structured light projection for 3D reconstruction. Telecentric macro lenses must maintain their telecentricity specification across all these illumination geometries, which requires careful analysis of the lens pupil position and its interaction with the illumination source geometry.
Environmental factors also play a significant role in lens selection for aerospace production environments. Vibration from nearby machinery, temperature cycling from HVAC systems, and airborne particulate contamination from machining operations all affect long-term lens performance. Canrill Optics' industrial-grade telecentric lenses feature precision-ground aluminum alloy barrels with hard anodized surfaces, sealed optical elements, and locking focus rings that maintain calibration stability through the demanding conditions of aerospace manufacturing environments.
Integration with existing machine vision platforms — including Cognex, Keyence, Basler, and Teledyne FLIR camera systems — is simplified by standard C-mount and M42×0.75 interfaces, while software compatibility with common metrology packages (Halcon, VisionPro, LabVIEW Vision) ensures rapid system commissioning and validation against aerospace quality standards.
For applications requiring NADCAP or AS9100D audit support, Canrill Optics provides full calibration certificates, measurement uncertainty budgets, and optical performance documentation traceable to national metrology standards, supporting the comprehensive qualification documentation required by aerospace quality management systems.
Our objective is to produce a top-level lens and become one of the leaders in telecentric technology.
From manufacturing to creation, we are on the way.
Canrill Optics, established in 2009, is the first one to focus on the manufacturing & marketing of telecentric lens and telecentric lens design in China, and the only one to build the complete supply chain with our own mechanical factory and optical factory in industry lens all over the world.
Over the years, as a custom lens manufacturer, Canrill lens has been upgraded four generations with advanced technology and performance, earned the trust from worldwide clients, and have successfully made cooperation with world-famous brands, like Samsung, Apple, LG, Huawei, Han's Laser, TSMC, etc.
Our objective is to produce a top-level lens and become one of the leaders in telecentric technology. From manufacturing to creation, we are on the way.
Since founding Canrill in 2009, Simon has been focused on building the world's leading manufacturer of telecentric lenses. Under Simon's leadership, Canrill has grown into a 100+ person company which is renowned in both China and overseas.
Senior optical designer, with 10+ years' experience in the design and inspection of telecentric lens and lights, driving continuous innovation in aerospace-grade optical metrology solutions.
15+ years' experience in mechanical design, ensuring that every Canrill telecentric lens barrel meets the precision tolerances and environmental durability requirements of aerospace and industrial inspection applications.
Canrill ISO 9001
Lens Cone RoHS Certificate 1
Lens Cone RoHS Certificate 2
Lens Cone RoHS Certificate 3
Lens Cone RoHS Certificate
Explore our full range of telecentric and line scan lenses engineered for the most demanding aerospace fastener inspection and metrology applications.
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View Details ›MT Series 1.1″ Telecentric Lens — Aerospace Fastener Dimensional Gauging
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View Details ›Telecentric Lens for 3D AOI — Fastener Surface Defect Detection
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8mm Sensor Telecentric Lens — Fastener Thread Pitch Measurement
View Details ›T Series Long WD Telecentric Lens — Assembly Line Fastener QC
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8K Line Scan (57.4mm) Telecentric Lens — High-Speed Fastener Inspection
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T Series Telecentric Lens — Aerospace Fastener Metrology Standard
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