1. Product Introduction

The 6302-RS is a single-row deep groove ball bearing measuring 15 mm bore, 42 mm outside diameter and 13 mm width, protected on both sides by RS rubber contact seals. It is made from high-purity GCr15 chrome bearing steel, quenched and tempered in a controlled cycle, then precision ground and matched to reach P5 (ABEC-5) precision with ZV4 low noise and V4 low vibration quality. The double-lip rubber seals hold the factory grease inside the raceway and shut out splashing water, humidity, dust and fine grit, so the bearing keeps turning smoothly in wet and dirty surroundings without frequent relubrication. Its 15 × 42 × 13 mm envelope is a standard ISO size, so an existing housing or shaft seat accepts the bearing without modification.

Sealing integrity combined with low noise and mixed load capacity makes the 6302-RS a dependable support for aquarium and pond circulation pumps, where splash water, damp air and continuous rotation are part of daily operation.

2. Product Features

• Double RS rubber seals: two contact lips press lightly against the inner ring land and form a closed barrier that keeps water spray, foam and grit away from the balls while retaining the grease charge.
• ZV4 low noise grade: superfinished raceways paired with diameter-sorted balls hold running noise at the ZV4 level, an advantage for pumps installed near living areas.
• P5 precision class: strict limits on bore, outside diameter and raceway roundness provide accurate fit, small run-out and silent, stable rotation.
• Sealed-for-life lubrication: the correct grease volume is filled before sealing, so normal service needs no topping up and no maintenance access.
• Composite load support: radial load and moderate axial load in both directions are carried by the same deep groove, suiting pump impeller thrust as well as belt or coupling pull.
• Moisture resistance: hardened GCr15 steel with a fine surface finish resists the corrosion and wear that humid pump rooms cause on unprotected bearings.
• Simple replacement: standard 6302 boundary dimensions allow fitting into existing pump housings and interchange with bearings from other makers.

3. Product Advantages

Before packing, every 6302-RS lot goes through dimensional, hardness, noise, vibration and seal-tightness checks, so quality stays consistent across repeat orders and field failures stay rare. The rubber sealing system lengthens service intervals in wet, salty and dusty pump environments, and the sealed design cuts the maintenance that open bearings demand in continuous duty. Direct factory supply allows customized precision class, clearance, grease type and neutral packaging, and regular stock shortens the lead time for replacement projects.

4. Product Technical Parameters

5. Product Applications

The leading application of the 6302-RS is the aquarium and pond circulation pump: the bearing carries the pump shaft behind the impeller, running day and night in splash water, humid air and occasional cleaning spray, while the rubber seals keep moisture out of the raceway and the pre-filled grease in place. Quiet ZV4 running also matters here, because aquarium pumps often sit inside living rooms and bedrooms.

Other installations include garden fountain and waterfall pumps, small submersible pumps, humidifier and misting unit motors, water treatment dosing pump drives, outdoor garden irrigation boosters and car wash sprayer pump shafts.

6. Company Profile

Ningbo Kent Bearing Company was established in 2003 and is one of the leading bearing manufacturers and exporters in China. Kent specializes in the design and production of high precision, high speed and low noise deep groove ball bearings and pillow block bearings. At present, the Corporation has more than 1,000 employees, a fixed assets of 2 billion yuan, and produces 250 million sets of bearings annually. The Corporation's products are widely used in more than 50 countries and regions under 2 independent brands, namely "BUGAO" and "NBKT".

Since 2003, the Corporation has set up a Research & Development Center equipped with multiple laboratories used for precision measurement, mechanical testing, lifespan testing, and physicochemical testing, to continuously upgrade its skills and raise its manufacturing standard and product's precision. Our workshops are installed with a series of advanced numerically-controlled, grinding and assembly equipment that utilize centralized filtration and cooling systems. Together with the production equipment suppliers, we developed these grinding, ultra-precision, fully automated integrated production lines, and own the intellectual property rights. The precision level of the products are at P5 level and above, with noise level reaching Z4, V4 and above. Some of our projects have exceeded the 30% precision reserves. Our products are widely used in electric motors, automobiles, motorcycles, household appliances, textile, electric tools and water pump equipment industries, both locally and globally.

The company has more than 20 assembly lines, and through ISO9001:2015 quality management system certification, has a professional technical and service team, technical personnel proportion of more than 30%. Over the years, we have been adhering to the use of high-end raw material production, from the first to every step, with excellent product development capabilities and strict quality control, we continue to expand the product line and application range.