Premium global supply matching exact dimensional tolerances for heavy machinery assemblies.
An authoritative guide to mechanical shaft locking mechanisms, structural materials, and engineering tolerances.
In mechanical engineering, mounting tapered-bore rolling bearings onto smooth or stepped cylindrical shafts requires absolute precision. The adapter sleeve stands out as the most widely used component for this specific function. By acting as a friction-based mechanical locking interface, it accommodates variance in shaft tolerances while maintaining an exceptionally rigid grip. This eliminated the need for complex, costly shaft machining steps such as machining shoulders or threading the shaft ends. VETOR GROUP’s adapter sleeves, including the H306, H2310, H2309, H2308, H2305, and H2303 series, are manufactured to exceed standard international parameters, offering robust operations under severe rotational loads and high vibrations.
Choosing the correct adapter sleeve is vital for preventing bearing slippage, reducing vibration harmonics, and preventing premature fatigue failures in high-speed applications. As a specialized bearing accessory supplier, we employ premium quality carbon steel grades (such as standard carbon structural steel C35 or C45) that undergo precise mechanical machining, surface treatment, and tempering to guarantee high tensile strength and long-term fatigue limit.
Our sleeves feature a 1:12 taper profile (standard for H-series adapter sleeves) maintained to within single-digit micrometer tolerances. This ensures a uniform radial contraction of the bearing inner ring, preventing localized mechanical stress peaks and premature wear.
Equipped with heavy-duty KM lock nuts and MB lock washers. The lock washer tabs fit securely into the keyways of both the sleeve and the nut, providing absolute protection against rotational back-off under high torsional vibration.
Every component receives high-grade manganese phosphating or rust-inhibitive oil plating. This enhances surface corrosion resistance, reduces friction during initial tightening, and prevents cold welding (galling) of mating parts.
Critical mechanical dimensions and compatibility values for standard metric shaft configurations.
| Adapter Sleeve Model | Shaft Diameter d1 (mm) | Thread Spec (d3) | Outer Diameter of Lock Nut (d2) | Overall Length (B1) | Compatible Spherical Roller / Self-Aligning Bearing |
|---|---|---|---|---|---|
| H306 | 25 | M30x1.5 | 45 mm | 31 mm | 1306K, 2206K, 2306K, 21306K |
| H2303 | 15 | M17x1.0 | 28 mm | 26 mm | 1303K, 2203K, 2303K |
| H2305 | 20 | M25x1.5 | 38 mm | 29 mm | 1305K, 2205K, 2305K |
| H2308 | 35 | M40x1.5 | 58 mm | 36 mm | 1308K, 2208K, 2308K, 21308K |
| H2309 | 40 | M45x1.5 | 65 mm | 39 mm | 1309K, 2209K, 2309K, 21309K, 22209K |
| H2310 | 45 | M50x1.5 | 70 mm | 42 mm | 1310K, 2210K, 2310K, 21310K, 22210K |
Unlocking unparalleled manufacturing efficiency, technical specialization, and logistics scalability.
Cixi City, located in Zhejiang Province, is widely recognized as the global heart of precision bearing and machine component manufacturing. Housing thousands of dedicated metal forging, high-precision grinding, heat treatment, and automated packaging facilities, the industrial cluster in Cixi allows VETOR GROUP to source premium raw materials and complete complex manufacturing operations at unmatched efficiency.
Being on the bank of the Hangzhou Bay gives us unmatched proximity to major transport portals. We are located just a 90-minute drive from Hangzhou Xiaoshan International Airport and Ningbo Lishe International Airport, and seamlessly integrated into the logistics network of two of the busiest maritime ports globally: Shanghai Port and Ningbo Port. This translates directly to reduced transit costs, faster customs clearance, and predictable shipping schedules for our global customers.
Bridging the gap between premium Chinese engineering and global mechanical supply chains.
VETOR GROUP was founded in 2005. We are a comprehensive foreign trade group specializing in import and export operations. Our company is located in Cixi City, a vibrant economic hub in China, on the bank of the fertile and scenic Hangzhou Bay. Thanks to our strategic location, we enjoy close proximity to two of China's largest ports—Shanghai Port and Ningbo Port—as well as easy access to Hangzhou Xiaoshan International Airport and Ningbo Lishe International Airport, both only about a 90-minute drive away. This offers exceptionally convenient transportation and logistics advantages.
We specialize in supplying a wide range of products including Motorcycle Parts, Auto Parts, ATVs, Dirt Bikes, Bicycles, and Related Components. Committed to exceeding customer expectations, we provide diverse, high-quality products and services to help our clients thrive in a highly competitive global market. All our products are exported worldwide, and our operations are certified to the ISO9001 international standard.
Additionally, VETOR GROUP operates our in-house manufacturing facility specializing in the production of deep groove ball bearings and EMQ (Electric Motor Quality) grade bearings, with inner ring dimensions ranging from 6mm to 90mm. We place strong emphasis on brand development, and our VETOR brand bearings are known for their: low noise, vibration, and friction; high precision and sealing performance; operational stability and long service life; and complete absence of abnormal sound.
Engineered for extreme performance and silent runtime, perfect for household appliances and high-frequency motors.
Proprietary shielding and sealing geometries keep lubricants in while shutting out microscopic contaminants.
Heat-stabilized rings and elements withstand extreme loads without early sub-surface fatigue cracking.
Every bearing undergoes dynamic noise vibration testing (EMQ standards) to guarantee quiet operation.
Take a look inside our high-tech manufacturing, grinding, and automated assembly floors.
Rigorous quality controls validated by global inspection organizations.
Connecting with global procurement executives, technical engineers, and supply chain managers.
How we protect, optimize, and streamline supply chains for heavy industrial buyers.
Expert Team & Patents: Our in-house research engineers at TaiYa Bearing focus continuously on metallurgical innovation, holding multiple design and workflow patents.
Material Expertise: We construct our adapter sleeves with structural carbon steel, high-grade chromium, and select ceramic alternatives to prevent radial load slip.
Tailored Fits: Fully custom dimensions, threads, seals, and extreme tolerance targets match your exact applications.
ISO9001 Compliance: All manufacturing sites follow international standards, keeping deviation bounds tight.
Dynamic Auditing: We conduct rigorous testing for structural resonance, lock nut thread fatigue, and surface micro-hardness.
Full Traceability: From the raw steel billet down to the finalized packed box, each batch is coded for quality tracking.
Low MOQ: Minimum orders starting at 1,000 pieces for standard adapter sleeve runs.
OEM/ODM Services: Customized markings, private labeling, unique MB washer shapes, and specific thread geometries.
Prototyping: Rapid validation samples fabricated and dispatched within 7–10 working days.
Located near Ningbo and Shanghai Ports, VETOR GROUP executes fast bulk cargo booking, consolidating shipments to reduce overall lead times. Standard orders are dispatched within 7 to 20 days, and our support staff handles complete custom declarations, documentation, and compliance paperwork for target markets in Europe, the Americas, the Middle East, and Africa.
By removing middle trading steps and utilizing fully integrated local Cixi supply chains, we pass on direct cost benefits. We also offer scale-based price structures for high-volume distributors, heavy equipment manufacturers, and master exporters looking to maintain structural cost advantages.
Beyond adapter sleeves—discover our complete spectrum of engineering and automotive components.
Deep groove ball bearings, tapered roller bearings, and EMQ class bearings ranging from 6mm to 90mm bore. Perfect for low-noise mechanical assemblies.
High-performance engine cylinders, clutch cables, chains, brake shoes, rocker arms, and riding gear built to strict OEM specifications.
Engine cooling assemblies, steering link systems, transmission units, and customized chassis parts manufactured under ISO9001 guidelines.
Heavy-duty suspension systems, reinforced structural guards, weather-proof electronics, and drive systems built for rugged off-highway terrain.
Chassis brackets, exhaust setups, and high-performance racing components designed to withstand extreme impact and off-road stress.
Lightweight structural frames, precision derailleurs, brake calipers, and hubs, matching city, road, and trail configurations.
Flexible industrial solutions structured around quick reaction, configuration support, and reliable shipping times.
Our technical support desk operates from 8:00 to 17:00 (GMT+8) Monday through Saturday, securing solutions to technical queries in minimal turnaround times.
Active OEM partnerships are available. Our design division reads standard CAD/STEP files to adapt structures, tolerances, and markings to your catalog specifications.
We schedule, verify, and complete cargo handovers in complete alignment with contractual dates, minimizing line stoppage risk for overseas buyers.
How our components drive machinery performance across key sectors.
High-precision bearings and adapter sleeves stabilize drive shafts, reducing vehicle vibration harmonics, extending gear mesh lifetime, and improving overall driving safety.
In mining and industrial bulk material handling, adapter sleeves lock large spherical roller bearings on long tail and head pulley shafts under persistent load shocks.
Our dust-proof seals and corrosion-resistant coatings keep harvest systems, balers, and tillers working reliably in fields full of mud, fertilizer, and moisture.
VETOR EMQ bearings run quietly in high-speed electric motors, keeping washing machines and ceiling fans operating without noise over long service lives.
Direct engineering answers to common technical queries about adapter sleeves.
An adapter sleeve acts as a split, tapered sleeve that slips onto cylindrical shafts, allowing bearings with a tapered bore (typically 1:12 or 1:30 taper) to be secured directly onto the shaft. Tightening the KM lock nut forces the bearing inner ring up the taper of the sleeve, causing the sleeve to clamp down onto the shaft. This creates a secure friction-based locking mechanism without requiring additional shaft steps, shoulders, or threads.
The primary difference lies in the mounting direction and locking method. Adapter sleeves (H, H2, H3, H23 series) are pushed into the bearing bore and locked with a nut on the narrow end of the taper. They are easier to install and do not require a threaded shaft. Withdrawal sleeves (AH, AHX series) are pressed into the bearing bore from the wide end, requiring a threaded shaft or shaft end-plate to lock them in place. Withdrawal sleeves are typically preferred for high-torque applications where mounting and dismounting need to be executed rapidly, often using hydraulic aid.
As the bearing inner ring is pushed up the adapter sleeve, it expands radially, which reduces the internal clearance of the bearing. If you over-tighten the lock nut, you can reduce this clearance to zero, leading to high friction, heat buildup, and bearing failure during operation. Therefore, technicians must measure the radial clearance with a feeler gauge during tightening to ensure the clearance remains within the specified range for the bearing class (e.g., C3 or normal clearance).
The model number contains dimensional keys. For example, H306 is built for a 25mm shaft (matching a 30mm bearing bore code 06), whereas H2310 is configured for a 45mm shaft (matching a 50mm bearing bore code 10). The prefix 'H23' indicates a wider width profile (typically matching 223..K or 23..K bearing series), while 'H3' indicates a standard narrow width profile (typically matching 13..K or 22..K series).
Our adapter sleeves are made of premium quality carbon steel grades (such as C35, C45, or comparable high-tensile engineering steels). The lock nuts (KM series) are manufactured from carbon steel, and the lock washers (MB series) are made from deep-drawn structural carbon sheet steel to ensure the tabs can be bent repeatedly without snapping.
Yes, the adapter sleeve itself can be reused if it shows no signs of scoring, wear, or plastic deformation along the taper or bore. However, the MB lock washer should always be replaced once it is bent open, as the locking tabs undergo metal fatigue during bending and may fail if reused.
All our manufacturing processes conform to the ISO9001 international standard. We implement rigorous testing at multiple stages, including raw material metallurgical testing, dimensional tolerance checking (using high-accuracy air gauges), roundness/taper checks, and final noise/vibration analysis (for assembled bearings).
Standard order lead times range between 7 to 20 days depending on the volume and customization needs. Our location in Cixi is close to both Ningbo Port and Shanghai Port, allowing us to load containers and clear customs quickly. We ship worldwide via sea freight (FCL/LCL), air cargo, or express courier.
Reliable parts exported worldwide to ensure your equipment and vehicles run smoothly.
VETOR GROUP
