Universal Size Chart
Check your handpiece model below to find the correct bearing kit. All dimensions in mm (ID x OD x W).
| ISO Code / Model | Dimensions (ID x OD x W) | Configuration | Common Applications | View Part |
|---|---|---|---|---|
| SR144TLK (Standard) | 3.175 x 6.35 x 2.78 mm | Torlon Cage / Ceramic | KaVo, Midwest, Star, Bien-Air | View Details |
| SR144TLZ (Narrow) | 3.175 x 6.35 x 2.38 mm | Torlon Cage / Ceramic | NSK, W&H, Sirona Mini | View Details |
| SFR144 (Flanged) | 3.175 x 6.35 x 2.38 mm | Flanged Outer Ring | Old Midwest, Japanese Spindles | View Details |
| SR144TLK-C (Lube-Free) | 3.175 x 6.35 x 2.78 mm | Phenolic Cage / Ceramic | Star 430 SWL, Maintenance Free | View Details |
| MR126ZZ | 6.00 x 12.00 x 4.00 mm | Steel / Shielded | Laboratory Motors | View Details |
| 1040 (Legacy) | 3.00 x 6.00 x 2.00 mm | Steel / Ceramic | Castellini, Micro-Motors | View Details |
← Scroll right to view more sizes
Ceramic vs. Steel: Which Bearing Should You Choose?
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Focus on Ceramic Advantage:
“Ceramic Dental Bearings (Hybrid Ceramic) are the industry standard for high-speed turbines. We use Grade 3 Silicon Nitride (Si3N4) balls which are 60% lighter and 40% harder than steel. This reduction in mass significantly lowers centrifugal force at 400,000 RPM, resulting in less vibration, lower noise levels, and a lifespan that is 2-3 times longer than traditional steel bearings.”
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Focus on Cage Material – Torlon vs Phenolic:
“The cage (retainer) is critical for high-speed stability. We offer two premium options: Torlon (Polyamide-imide) cages for extreme durability and wear resistance in lubricated handpieces, and Phenolic (Textolite) cages which are porous and can retain oil, making them ideal for autoclavable turbines and specific ‘Lube-Free’ applications.”
Our Products
Not sure which bearing fits your handpiece?
Don’t guess. Send us a photo of your turbine or the old bearing. Our technicians will identify the correct ISO part number for you within 1 hour.
FAQ for High Speed Dental Bearings
What does ABEC-7 (P4) mean for dental bearings?
ABEC-7 (ISO P4) refers to the precision tolerance of the bearing. For dental turbines spinning at 400,000 RPM, precision is non-negotiable. Our ABEC-7 bearings have tighter tolerances on roundness and run-out (<0.0025mm), ensuring the bur spins true without wobbling, which protects the turbine chuck and improves cutting efficiency.
How often should high-speed dental bearings be replaced?
In a busy dental practice, high-speed bearings typically last 6 to 12 months depending on usage, lubrication, and sterilization frequency. Signs of wear include increased noise, vibration, bur run-out, or a drop in torque. We recommend replacing bearings at the first sign of noise to prevent damage to the turbine spindle.
Do these bearings fit all dental handpiece brands?
Our catalog covers 95% of the world’s high-speed turbines. The most common sizes are SR144 (Standard) and SR144TLZ (Narrow). These two sizes fit most models from KaVo, NSK, W&H, Bien-Air, and Midwest. Please check our Size Chart or use a caliper to measure your old bearing’s ID, OD, and Width.
Do you offer bulk pricing for repair shops?
Yes. We are a direct manufacturer/supplier. We offer tiered wholesale pricing for orders of 50, 100, or 500+ pieces. We also provide OEM packaging and blind drop-shipping services for dental parts distributors worldwide.