NA4900 in one paragraph

NA4900 Specifications

Designation	NA4900 (catalogue code NA4900R; sealed version NA4900LL/3AS)
Type	Machined ring needle roller bearing, with inner ring, caged
Bore diameter d	10 mm
Inner ring raceway diameter F	14 mm
Outside diameter D	22 mm
Width C (outer ring) / B (inner ring)	13 mm / 13 mm
Corner radius rs min	0.3 mm
Dynamic load rating Cr	8.6 kN
Static load rating C0r	9.2 kN
Limiting speed, grease / oil	16 000 / 24 000 r/min
Mass	0.024 kg (24 g)
Rings	Machined, through-hardened GCr15, ground raceways
Rollers / cage	GCr15 needle rollers, steel cage
Tolerance class	P0 standard, P6 on request
Shaft seat (inner ring bore)	k6, Ra ≤ 0.4 µm — the ring is the raceway, not the shaft
Housing bore	H7 (N7 only if the outer ring must not creep under rotating load)
Operating temperature	−30 °C to +120 °C
MOQ	100 pcs

Dimensions

D ⌀22F ⌀14d ⌀10End viewC 13D 22SectionNA4900 · 10 × 22 × 13 mm · inner ring width B = 13 mmF is the inner ring raceway diameter (14 mm) — the surface the rollers run on. It is not the shaft diameter; the shaft sits in the 10 mm bore, and the inner ring carries the raceway.

Shaft and Housing Fit

Interface	Typical	Why
Inner ring bore / shaft	k6 (h6 for light load), Ra ≤ 0.4 µm	Interference keeps the ring from creeping; the ring, not the shaft, is the raceway
Outer ring / housing	H7; N7 if the outer ring rotates or sees vibration	H7 allows assembly and axial location by a shoulder; N7 prevents creep
Housing shoulder	Square to the bore within IT5	The rings are located axially by shoulders — an out-of-square shoulder tilts the outer ring
Bore roundness	IT6 or better	Machined rings are stiff; an oval bore loads one side of the complement

NA4900 Against the Alternatives

Option	d × D × C (mm)	Cr / C0r (kN)	Speed grease / oil	Mass	When it wins
NA4900	10 × 22 × 13	8.6 / 9.2	16 000 / 24 000	0.024	Axial location, replaceable inner ring, higher capacity in 22 mm bore
NA4900LL/3AS	10 × 22 × 13 (B 14)	7.2 / 8.5	10 000 (sealed)	0.025	Sealed both sides, grease for life, 16% less capacity
HK1612 (drawn cup)	16 × 22 × 12	7.37 / 9.8	ref 14 000 / lim 16 000	0.012	16 mm shaft, thin wall, lowest cost — but no axial location

Same 22 mm housing bore, three answers: NA4900 gives the most load on a 10 mm shaft and can be located by shoulders; HK1612 takes a 16 mm shaft and halves the mass but provides radial support only.

Equivalent Designations

Brand	Code	Note
INA / FAG	NA4900	Same 49 dimension series, 10 × 22 × 13
SKF	NA 4900	Same boundary dimensions; check the internal clearance class
NSK / NTN	NA4900	Same dimensions; seal and lubrication options differ
Our code	NA4900 / NA4900R	R = open version; LL/3AS = sealed both sides

Cross-reference is by boundary dimensions, not by internal design. Always confirm C_r, clearance and cage type before substituting.

NA49 Series Quick Reference

Ten sizes from the same series. The full 20-size table, including the sealed LL versions, is on the NA series size chart.

Designation	d	F	D	C / B	Cr / C0r (kN)	Grease / oil	Mass (kg)
NA4900	10	14	22	13 / 13	8.6 / 9.2	16 000 / 24 000	0.024
NA4901	12	16	24	13 / 13	9.55 / 10.9	15 000 / 23 000	0.026
NA4902	15	20	28	13 / 13	10.3 / 12.8	13 000 / 20 000	0.036
NA4903	17	22	30	13 / 13	11.2 / 14.6	12 000 / 18 000	0.037
NA4904	20	25	37	17 / 17	21.3 / 25.5	11 000 / 16 000	0.074
NA49/22	22	28	39	17 / 17	23.2 / 29.3	9 500 / 14 000	0.080
NA4905	25	30	42	17 / 17	24 / 31.5	8 500 / 13 000	0.088
NA4906	30	35	47	17 / 17	25.5 / 35.5	7 500 / 11 000	0.101
NA49/32	32	40	52	20 / 20	31.5 / 47.5	6 500 / 10 000	0.157
NA4907	35	42	55	20 / 20	32 / 50	6 500 / 9 500	0.171

Where NA4900 Is Used

• Gearbox and reducer shafts — a fixed position between two shoulders, where a drawn cup has no axial stop.
• Machine tool feed drives — P6 rings and a stiff outer ring suit low-vibration duties.
• Pumps and compressors — inner ring replaceable on the shaft, housing bore left intact.
• Textile and printing machinery — 24 g mass and 24 000 r/min oil speed for continuous running.

MOQ, Lead Time and Packing

MOQ 100 pcs; stock 3–7 days, production 20–30 days. 10 pcs per VCI bag, 1 000 per carton, pallet or plywood case, air or sea. P6, special clearance and the sealed LL version on request — add 5 days for non-stock grades.

Frequently Asked Questions

What is the difference between NA4900 and RNA4900?

NA4900 has an inner ring and runs on a 10 mm shaft. RNA4900 has no inner ring, so the shaft itself must be hardened and ground to become the raceway — its bore is larger for the same outside diameter.

Can NA4900 take axial load?

No. It locates axially — the rings can sit against shoulders — but the rollers carry radial load only.

Which shaft and housing fits should I use?

Shaft k6 with Ra ≤ 0.4 µm into the inner ring bore, housing H7 (N7 if the outer ring must not creep). Unlike a drawn cup, the shaft is not the raceway, so it does not need to be hardened to 58 HRC.