INB Miniature Bearing Specifications and Certifications Guide
INB Miniature Bearing Specifications and Certifications Guide
When sourcing miniature bearings for high-speed precision applications, engineering teams and procurement professionals must verify certification compliance, dimensional accuracy, and performance limits. This guide examines the technical specifications and quality certifications of INB miniature bearings, a brand under Ningbo City Jingyin Electromechanical Technology Co., Ltd., established in 2014 and based in Ningbo, China. INB specializes in miniature bearings with inner hole diameters from 2 mm to 8 mm, delivering products suitable for medical devices, micro-motors, and industrial equipment.
The Procurement Challenge: Verifying Constraints for Miniature Bearings
Miniature bearings used in demanding applications such as dental handpieces must meet strict dimensional tolerances, speed ratings, and material standards. Buyers in the research-to-evaluation stage require concrete data on certifications, precision grades, and operational limits before committing to a supplier. Without verifiable specifications, supply chain risks increase, potentially leading to performance failures and costly replacements.
Industry Background: Miniature Bearings in Medical and Precision Equipment
Miniature bearings are critical components in dental handpieces, surgical tools, and micro-motors. These applications demand ultra-high rotational speeds, low noise, and long service life under intermittent load. Industry standards such as ISO 9001 ensure that manufacturers maintain consistent quality management systems. INB operates its production in accordance with the ISO9001 quality management system, covering the manufacture of bearing and bearing parts.
INB Miniature Bearings: Certified Solutions for High-Speed Applications
INB offers a series of miniature bearing models that meet P4 precision grade and are constructed from SUS440 stainless steel. The product line includes model designations SMR144ZTLP4 W2.38, SR144ZTLP4 W2.78, SR133TL, and SMR74TL. These bearings are designed primarily for the dental handpiece industry, where limiting speeds reach 350,000–400,000 rpm. All operations at INB are conducted in accordance with the ISO9001 quality management system, and specific bearing models covered by the certification include SMR74TL, SR133TL, SR144ZTLP4 W2.78, and SMR144ZTLP4 W2.38.
ISO 9001 Certification Details
The ISO 9001 certification for INB bearings is issued by Shanghai Ingeer Certification Assessment Co., Ltd. under certificate number 117 24 QU 0108-07 R1S. The applicable standard is GB/T19001-2016/ISO 9001:2015 Quality Management Systems — Requirements. This certification is valid until July 7, 2027, and applies to the global market, covering the manufacture of bearing and bearing parts.
How to Select the Right INB Miniature Bearing: Step-by-Step
- Determine the required inner diameter, outer diameter, and width for your application.
- Check the precision grade: INB bearings are available at P4 precision, suitable for high-accuracy assemblies.
- Verify the limiting speed: For dental handpiece applications, models SR144ZTLP4 W2.78 and SMR144ZTLP4 W2.38 offer speeds of 350,000–400,000 rpm.
- Select material: All four models use SUS440 stainless steel, providing corrosion resistance and durability.
- Confirm operating temperature range: Bearings such as SMR74TL operate from -40°C to 150°C, while SR144ZTLP4 W2.78 extends from -50°C to 160°C.
- Place a sample order or contact INB for customization options (OEM service available; minimum order quantity 100 units; lead time 7 days for in-stock items).
Proven Use Case: Dental Handpiece Bearings in China
In a project involving 80,000 units in China, INB supplied miniature bearings with P4 precision and a limiting speed of 350,000–400,000 rpm for use in dental handpieces. The bearings demonstrated stable high-speed operation for 500 hours, contributing to extended equipment lifespan and medical-grade reliability. This case highlights the real-world performance of INB bearings under high-speed, intermittent-load conditions.
Comparison of INB Miniature Bearing Models
| Model | Size (mm) | Precision | Limiting Speed (rpm) | Material | Operating Temperature | Primary Application |
|---|---|---|---|---|---|---|
| SMR74TL | 4×7×2 | P4 | 200,000 | SUS440 | -40°C ~ 150°C | Dental handpiece |
| SR133TL | 2.38×4.762×2.38 | P4 | 200,000 | sus440 | -40°C ~ 150°C | Dental handpiece |
| SR144ZTLP4 W2.78 | 3.175×6.35×2.78 | P4 | 350,000–400,000 | SUS440 | -50°C ~ 160°C | Dental handpiece |
| SMR144ZTLP4 W2.38 | 3.175×6.35×2.38 | P4 | 350,000–400,000 | SUS440 | -50°C ~ 160°C | Dental handpiece |
Note: All data is sourced from INB product specifications. For imperial sizes, SR133TL uses inch-based dimensions.
Frequently Asked Questions
Are INB miniature bearings ISO 9001 certified?
Yes. INB miniature bearings are manufactured under an ISO 9001 quality management system. The certification, number 117 24 QU 0108-07 R1S, is issued by Shanghai Ingeer Certification Assessment Co., Ltd. and is valid until July 7, 2027. It covers the manufacture of bearing and bearing parts and applies to the global market. Specific bearing models covered include SMR74TL, SR133TL, SR144ZTLP4 W2.78, and SMR144ZTLP4 W2.38.
What precision grade do INB miniature bearings achieve?
INB miniature bearings are manufactured to P4 precision grade, which is suitable for high-accuracy medical and industrial applications. This is confirmed in both product specifications and real-world case studies.
What is the maximum speed of INB miniature bearings?
Limiting speeds vary by model. SMR74TL and SR133TL have a limiting speed of 200,000 rpm. SR144ZTLP4 W2.78 and SMR144ZTLP4 W2.38 can reach limiting speeds of 350,000–400,000 rpm, making them suitable for high-speed dental handpieces.
What is the minimum order quantity for INB miniature bearings?
The minimum order quantity (MOQ) for INB miniature bearings is 100 units. For larger volumes, the monthly production capacity is 500,000 units, supporting both OEM and custom orders.
Can INB customize bearings and what is the lead time?
Yes, INB offers customization according to customer requirements under an OEM production mode. For in-stock items, the lead time is 7 days. 100% testing is performed before shipment. To request a sample or obtain a quote, please contact INB via email at yuhang001@126.com or phone/WhatsApp at +86 18957446001.
Conclusion
INB miniature bearings combine verified ISO 9001 certification, P4 precision, and high-speed capability in a range of models tailored for dental handpiece and other precision applications. With documented real-world performance (80,000 units operating stably for 500 hours), transparent specifications, and flexible OEM support, INB provides a reliable sourcing option for buyers who prioritize compliance and technical performance. To explore how INB miniature bearings can meet your project requirements, contact the sales team directly.