Custom NA Series Stainless Steel Insert Ball Bearings Manufacturers, Factory

STAINLESS INSERT BEARING · NA SERIES · WASHdown DUTY

NA Series

Stainless Steel Insert Ball Bearings

Bore 12–50 mm

Seal 2RS

Grease H1 food grade

The NA Series stainless steel insert ball bearing is built for conveyor and drive positions that go through regular cleaning, moisture contact, or mild chemical exposure. The insert pairs stainless steel rings and balls with an eccentric locking collar, which grips the shaft without the need for machined shoulders. The outer ring carries a spherical profile so the unit seats into standard concave housings and tolerates a small amount of shaft deflection. Both sides use contact rubber seals, and the cavity is packed with food-grade grease before shipping. Bore diameters cover 12 mm to 50 mm, outer diameters 32 mm to 100 mm, and width 12 mm to 32 mm. Service temperature stays between -20°C and +110°C. The series is mainly specified in food processing, beverage bottling, packaging lines, and pharmaceutical equipment where corrosion resistance is a procurement requirement.

KEY CHARACTERISTICS

Stainless rings and balls

Withstands repeated washdown and chemical contact without rusting or pitting on the raceway surfaces.

Eccentric locking collar

The collar rotates onto the inner ring to clamp the shaft, simplifying installation and allowing removal without damaging the shaft finish.

Spherical outer contour

Fits concave pillow block and flanged housings, absorbing small shaft misalignment that would otherwise stress the raceway edge.

Contact seal and food-grade fill

Rubber contact seals on both sides block water and product residue, while the pre-filled H1 grease supports sanitary operating conditions.

ORDERING REFERENCE

Bore diameter12 mm – 50 mm

Outer diameter32 mm – 100 mm

Width12 mm – 32 mm

Ring and ball materialStainless steel

Locking methodEccentric collar

Sealing type2RS contact rubber

Grease fillH1 food grade

Temperature range-20°C to +110°C

Housing compatibilityPillow block / flanged

PackagingCorrosion-resistant carton

SPECIFICATION AREAS

Food processing conveyors

Roller and drive shaft support on lines that run frequent washdown cycles with sanitizing agents.

Beverage bottling lines

Conveyor and filler positions exposed to water spray, syrup residue, and cleaning chemicals.

Packaging machinery

Capping, labeling, and cartoning units where moisture and product dust are present.

Pharmaceutical equipment

Cleanroom machinery that needs corrosion resistance and low particle shedding from moving parts.

Marine and dockside units

Deck handling equipment exposed to salt air and periodic water contact.

Chemical processing drives

Mixer and transfer equipment where mild corrosive media contact the housing area.

PROCUREMENT QUESTIONS

How does the eccentric collar differ from set screw locking?

The eccentric collar rotates onto the inner ring to clamp the shaft around its full circumference, spreading grip force more evenly than point-contact set screws. This reduces the risk of shaft marking and allows removal without scoring the shaft surface.

Can the NA Series be installed in existing pillow block housings?

Yes. The spherical outer contour matches standard concave housing bores, so the insert fits compatible pillow block and flanged units. Verify the housing bore diameter against the insert outer diameter before assembly.

What lubrication is applied at the factory?

Each unit is packed with H1 food-grade grease before sealing. The fill volume is set for the bearing size, so no additional lubrication is needed before line-side installation.

Which stainless grade is used for the rings and balls?

The rings and balls use a stainless bearing grade selected for wet and mildly corrosive service. The exact grade is listed on the material certificate supplied with each shipment.

WAREHOUSE AND ASSEMBLY NOTES

Shaft preparation

Clean the shaft and remove burrs before inserting the bearing. Surface defects under the inner ring create local stress points that shorten service life.

Collar tightening

Rotate the eccentric collar in the direction of shaft rotation and tighten the locking screw. Re-check seating after the first operating hours.

Housing bore check

Confirm the concave housing bore is clean and free of hardened residue. Contamination reduces the self-aligning effect and shortens insert life.

Storage

Keep original packaging sealed until line-side issue. Store away from chlorinated solvents and high humidity to preserve the stainless finish.

NA series stainless insert eccentric locking collar H1 food-grade fill

Bearing No.	d		Dimensions（mm）									Basic Load Rating (kN)
Bearing No.	(mm)	(in.)	D	Be	Bi	B1	n	K	H	G	ds	Dynamic	Static
NA203	17		40	14	37.3	27.8	13.9	28.6	13.5	5	M6x1	900	500
NA203-11	17.463	11/16	40	14	37.3	27.8	13.9	28.6	13.5	5	1/4-28UNF	900	500
NA204-12	19.05	3/4	47	17	43.7	34.2	17.1	33.3	13.5	5	1/4-28UNF	1250	650
NA204	20		47	17	43.7	34.2	17.1	33.3	13.5	5	M6x1	1250	650
NA205-14	22.225	7/8	52	17	44.4	35	17.5	38.1	13.5	5	1/4-28UNF	1400	750
NA205-15	23.813	15/16	52	17	44.4	35	17.5	38.1	13.5	5	1/4-28UNF	1400	750
NA205	25		52	17	44.4	35	17.5	38.1	13.5	5	M6x1	1400	750
NA205-16	25.4	1	52	17	44.4	35	17.5	38.1	13.5	5	1/4-28UNF	1400	750
NA206-18	28.575	11/8	62	19	48.4	36.6	18.3	44.5	15.9	6	5/16-24UNF	1900	1100
NA206	30		62	19	48.4	36.6	18.3	44.5	15.9	6	M8x1	1900	1100
NA206-19	30.163	13/16	62	19	48.4	36.6	18.3	44.5	15.9	6	5/16-24UNF	1900	1100
NA206-20	31.75	11/4	62	19	48.4	36.6	18.3	44.5	15.9	6	5/16-24UNF	1900	1100
NA207-20	31.75	11/4	72	20	51.1	37.6	18.8	55.6	17.5	6.5	5/16-24UNF	2550	1500
NA207-22	34.925	13/8	72	20	51.1	37.6	18.8	55.6	17.5	6.5	5/16-24UNF	2550	1500
NA207	35		72	20	51.1	37.6	18.8	55.6	17.5	6.5	M8x1	2550	1500
NA207-23	36.513	17/6	72	20	51.1	37.6	18.8	55.6	17.5	6.5	5/16-24UNF	2550	1500
NA208-24	38.1	11/2	80	21	56.3	42.8	21.4	60.3	18.3	6.5	5/16-24UNF	2950	1800
NA208-25	39.688	19/16	80	21	56.3	42.8	21.4	60.3	18.3	6.5	5/16-24UNF	2950	1800
NA208	40		80	21	56.3	42.8	21.4	60.3	18.3	6.5	M8x1	2950	1800
NA209-26	41.275	15/8	85	22	56.3	42.8	21.4	63.5	18.3	6.5	5/16-24UNF	3180	2050
NA209-27	42.863	1 11/16	85	22	56.3	42.8	21.4	63.5	18.3	6.5	5/16-24UNF	3180	2050
NA209-28	44.45	13/4	85	22	56.3	42.8	21.4	63.5	18.3	6.5	5/16-24UNF	3180	2050
NA209	45		85	22	56.3	42.8	21.4	63.5	18.3	6.5	M8x1	3180	2050
NA210-31	49.213	1 15/16	90	24	62.7	49.2	24.6	69.9	18.3	6.5	5/16-24UNF	3500	2300
NA210	50		90	24	62.7	49.2	24.6	69.9	18.3	6.5	M8x1	3500	2300
NA210-32	50.8	2	90	24	62.7	49.2	24.6	69.9	18.3	6.5	5/16-24UNF	3500	2300
NA211-32	50.8	2	100	25	71.4	55.6	27.8	76.2	20.7	8	3/8-24UNF	4350	2900
NA211	55		100	25	71.4	55.6	27.8	76.2	20.7	8	M10x1.25	4350	2900
NA211-35	55.563	23/16	100	25	71.4	55.6	27.8	76.2	20.7	8	3/8-24UNF	4350	2900
NA212-36	57.15	21/4	110	27	77.8	62	31	84.2	22.3	8	3/8-24UNF	4750	3250
NA212	60		110	27	77.8	62	31	84.2	22.3	8	M10x1.25	4750	3250
NA212-39	61.913	27/16	110	27	77.8	62	31	84.2	22.3	8	3/8-24UNF	4750	3250
NA213-40	63.5	21/2	120	28	85.7	68.6	34.1	86	23.5	8.5	3/8-24UNF	5700	4000
NA213	65		120	28	85.7	68.6	34.1	86	23.5	8.5	M10x1.25	5700	4000
NA215-47	74.613	215/16	130	30	92.1	75	37.3	102	23.5	8.5	3/8-24UNF	6600	4950
NA215	75		130	30	92.1	75	37.3	102	23.5	8.5	M10x1.25	6600	4950
NA215-48	76.2	3	130	30	92.1	75	37.3	102	23.5	8.5	3/8-24UNF	6600	4950

NA Series

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