Custom SER Series Stainless Steel Insert Ball Bearings Manufacturers, Factory

STAINLESS STEEL · INSERT · CORROSION RESISTANT

SER Series Stainless Steel Insert Ball Bearings

AISI 440C set screw locking 2RS seals

The SER Series stainless steel insert ball bearings are engineered for applications where corrosion resistance, hygiene, and durability are paramount. Constructed from AISI 440C martensitic stainless steel, these bearings offer excellent resistance to moisture, mild acids, and washdown environments without compromising load capacity. The spherical outer ring design compensates for shaft misalignment and mounting inaccuracies, while the set screw locking mechanism provides secure shaft attachment. Equipped with 2RS contact rubber seals on both sides, the bearings retain lubricant and prevent ingress of contaminants in food processing, pharmaceutical, and marine applications. The bearings are pre-lubricated with food-grade grease (NSF H1 registered) for direct contact with consumable products. Operating temperature ranges from -20°C to +110°C, compatible with high-temperature washdown cycles. Available in both inch and metric bore sizes for direct replacement in existing equipment.

Corrosion resistance

AISI 440C stainless steel construction provides excellent resistance to moisture, mild acids, and washdown chemicals in food and pharmaceutical environments.

Self-aligning design

Spherical outer ring compensates for shaft misalignment and mounting inaccuracies, reducing stress on the bearing and extending service life.

2RS sealing system

Dual-lip nitrile rubber seals provide superior protection against moisture ingress and contaminant penetration in washdown environments.

Secure locking

Set screw locking mechanism provides a secure interference fit on the shaft, preventing rotation slippage under shock loads.

Technical specifications

MaterialAISI 440C martensitic stainless steel

Bore diameter (inch)0.500 - 1.500 in

Bore diameter (metric)12mm - 40mm

Outer diameter1.000 - 2.500 in

Width range0.500 - 1.250 in

Locking typeSet screw (socket head)

Seal type2RS (nitrile rubber)

LubricationNSF H1 food-grade grease

Temperature range-20°C to +110°C

Precision gradeP0 (normal)

Application scenarios

Food processing equipment

Conveyor rollers, mixers, and packaging machinery in sanitary environments requiring washdown resistance.

Pharmaceutical manufacturing

Tablet presses, filling lines, and cleanroom conveyors where corrosion resistance is essential.

Marine and offshore

Deck machinery, winches, and equipment exposed to saltwater spray and high humidity.

Medical device manufacturing

Sterilization-friendly bearings for medical equipment and surgical tool production lines.

Technical inquiries

What is the difference between AISI 440C and 304 stainless steel for bearings?

AISI 440C is a martensitic stainless steel with higher hardness (58-60 HRC) and wear resistance compared to 304 (austenitic). 440C provides better load capacity and fatigue life, making it the preferred choice for bearing applications where corrosion resistance and mechanical strength are both required.

Is the SER Series suitable for high-temperature washdown?

Yes, the SER Series is designed for washdown environments with operating temperatures up to +110°C. The 2RS seals and food-grade grease maintain performance during high-temperature cleaning cycles. For continuous operation above 100°C, consult manufacturer for grease selection.

How do I properly torque the set screws?

Use a torque wrench with the specified torque value (typically 2-4 Nm for smaller sizes, up to 8 Nm for larger bearings). Over-tightening can deform the inner ring, while under-tightening may cause shaft slippage. Always use thread-locking compound for applications with vibration.

Can SER Series bearings be used in direct food contact applications?

Yes, the SER Series is available with NSF H1 registered food-grade grease, making it suitable for incidental food contact applications. The stainless steel construction and sealed design prevent lubricant contamination of food products.

Installation

Press the bearing into the housing using a mounting tool that contacts the outer ring. Ensure the shaft is clean and free of burrs before tightening the set screws.

Lubrication

Pre-lubricated with NSF H1 food-grade grease. For high-temperature or high-speed applications, relubrication intervals should be adjusted based on operating conditions.

Storage

Store in original packaging in a clean, dry environment. Avoid exposure to chlorinated solvents or high humidity that may compromise the corrosion-resistant properties.

Housing fit

Recommended housing tolerance is H7 for standard applications. For high vibration environments, use P6 housing fit to prevent outer ring rotation.

Bearing No.	d		Dimensions（mm）
Bearing No.	(mm)	(in.)	D	Bi	Be	n	j	a	h	P	G	ds
SER201	12		47	31	15.9	12.7	2.38	1.07	4	52.7	5	M6x1
SER201-8	12.7	1/2	47	31	15.9	12.7	2.38	1.07	4	52.7	5	1/4-28UNF
SER202	15		47	31	15.9	12.7	2.38	1.07	4	52.7	5	M6x1
SER202-10	15.875	5/8	47	31	15.9	12.7	2.38	1.07	4	52.7	5	1/4-28UNF
SER203	17		47	31	15.9	12.7	2.38	1.07	4	52.7	5	M6x1
SER203-11	17.463	11/16	47	31	15.9	12.7	2.38	1.07	4	52.7	5	1/4-28UNF
SER204-12	19.05	3/4	47	31	15.9	12.7	2.38	1.07	4	52.7	5	1/4-28UNF
SER204	20		47	31	15.9	12.7	2.38	1.07	4	52.7	5	M6x1
SER205-14	22.225	7/8	52	34.9	19	13.1	2.38	1.07	5.2	57.9	5.5	1/4-28UNF
SER205-15	23.813	15/16	52	34.9	19	13.1	2.38	1.07	5.2	57.9	5.5	1/4-28UNF
SER205	25		52	34.9	19	13.1	2.38	1.07	5.2	57.9	5.5	M6x1
SER205-16	25.4	1	52	34.9	19	13.1	2.38	1.07	5.2	57.9	5.5	1/4-28UNF
SER206-18	28.575	1 1/8	62	38.1	22.2	15.9	3.18	1.65	5.6	67.7	5.5	1/4-28UNF
SER206	30		62	38.1	22.2	15.9	3.18	1.65	5.6	67.7	5.5	M8x1.0
SER206-19	30.163	1 3/16	62	38.1	22.2	15.9	3.18	1.65	5.6	67.7	5.5	1/4-28UNF
SER206-20	31.75	1 1/4	62	38.1	22.2	15.9	3.18	1.65	5.6	67.7	5.5	1/4-28UNF
SER207-20	31.75	1 1/4	72	42.9	23.8	17.5	3.18	1.65	5.6	78.6	6.5	5/16-24UNF
SER207-21	33.338	1 5/16	72	42.9	23.8	17.5	3.18	1.65	5.6	78.6	6.5	5/16-24UNF
SER207-22	34.925	1 3/8	72	42.9	23.8	17.5	3.18	1.65	5.6	78.6	6.5	5/16-24UNF
SER207	35		72	42.9	23.8	17.5	3.18	1.65	5.6	78.6	6.5	M8x1.0
SER207-23	36.513	1 7/16	72	42.9	23.8	17.5	3.18	1.65	5.6	78.6	6.5	5/16-24UNF
SER208-24	38.1	1 1/2	80	49.2	27.8	19	3.18	1.65	6.4	86.6	8	5/16-24UNF
SER208-25	39.688	1 9/16	80	49.2	27.8	19	3.18	1.65	6.4	86.6	8	5/16-24UNF
SER208	40		80	49.2	27.8	19	3.18	1.65	6.4	86.6	8	M8x1.0
SER209-26	41.275	1 5/8	85	49.2	27.8	19	3.18	1.65	6.4	91.6	8	5/16-24UNF
SER209-27	42.863	1 11/16	85	49.2	27.8	19	3.18	1.65	6.4	91.6	8	5/16-24UNF
SER209	45		85	49.2	27.8	19	3.18	1.65	6.4	91.6	8	M8x1.0
SER209-28	44.45	1 3/4	85	49.2	27.8	19	3.18	1.65	6.4	91.6	8	5/16-24UNF
SER210-30	47.625	1 7/8	90	51.6	28.6	19	3.18	2.41	7.5	96.5	9.5	3/8-24UNF
SER210-31	49.213	1 15/16	90	51.6	28.6	19	3.18	2.41	7.5	96.5	9.5	3/8-24UNF
SER210	50		90	51.6	28.6	19	3.18	2.41	7.5	96.5	9.5	M10x1.25
SER211-32	50.8	2	100	55.6	30.2	22.2	3.18	2.41	7.5	106.5	10	3/8-24UNF
SER211-34	53.975	2 1/8	100	55.6	30.2	22.2	3.18	2.41	7.5	106.5	10	3/8-24UNF
SER211	55		100	55.6	30.2	22.2	3.18	2.41	7.5	106.5	10	M10x1.25
SER211-35	55.563	2 3/16	100	55.6	30.2	22.2	3.18	2.41	7.5	106.5	10	3/8-24UNF
SER212-36	57.15	2 1/4	110	65.1	31.8	25.4	3.18	2.41	7.5	116.6	10	3/8-24UNF
SER212	60		110	65.1	31.8	25.4	3.18	2.41	7.5	116.6	10	M10x1.25
SER212-38	60.325	2 3/8	110	65.1	31.8	25.4	3.18	2.41	7.5	116.6	10	3/8-24UNF
SER212-39	61.913	2.4375	110	65.1	31.8	25.4	3.18	2.41	7.5	116.6	10	3/8-24UNF

SER Series

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