FAG3490Imperial Tapered Roller Bearing Cone, 1.5000 in / 38.1 mm Bore, Mates Cup 3420 or 3426 – 1 Pc

Product Description

What this part is

This is an imperial single-row tapered roller bearing cone — the inner ring with its tapered rollers and cage. It is one half of a tapered roller bearing. The mating cup (outer race) is a separate part number and is not included in this listing.

Decoding the designation

3490 is a standard imperial cone number in the 34xx family. Its published mating cups are 3420 and 3422, and cup 3426 also lists 3490 among its cones — so a complete single-row bearing is a 3490 cone plus a 3420 or 3426 cup, depending on which housing width you are working to.

Published dimensions

Cone bore (d): 1.5000 in / 38.1 mm
Inner ring width (B): 1.1721 in / 29.771 mm
Mating cup 3420 outside diameter (D): 3.1250 in / 79.375 mm
Mating cup 3420 width (C): 0.9375 in / 23.813 mm
Alternative cup 3426 outside diameter (D): 3.1230 in / 79.324 mm
Cone weight: 3.59 lb / 1.628 kg

Published ratings and mounting data

The ratings below are catalogue values for the complete 3490/3420 single-row assembly, not for the cone alone.

Dynamic radial rating C1 (1 million rev basis): 23,500 lbf / 105,000 N
Dynamic radial rating C90 (90 million rev basis): 6,100 lbf / 27,100 N
Dynamic axial rating Ca90: 3,820 lbf / 17,000 N
Static radial rating C0: 26,800 lbf / 119,000 N
K factor: 1.60 · e: 0.37 · Y: 1.64 · geometry factor Cg: 0.0781
Effective load centre: −0.34 in / −8.6 mm (inside the cone backface)
Maximum shaft fillet radius cleared: 0.14 in / 3.600 mm
Shaft backing shoulder diameter, frontface (da): 1.8 in / 45.5 mm
Shaft backing shoulder diameter, backface (db): 2.05 in / 52 mm

What these specs mean in practice

A K factor of 1.60 is moderately steep, so this cone carries a useful amount of thrust rather than being a purely radial part, and the wide 1.1721 in inner ring gives it a static capacity of 26,800 lbf — higher than its dynamic C1. That combination is the signature of a bearing meant for heavy, shock-prone duty at modest speed: crusher and mill shafts, final drives, press eccentrics. The generous 0.14 in permissible shaft fillet makes it tolerant of a shaft shoulder that was not machined to bearing-seat standards.

Quantity and configuration

This listing ships 1 Pc — one 3490 cone. No cup, no spacer, no seal.

Fitting notes

Press the cone on square, driving on the backface only, never through the rollers or cage. Keep the shaft shoulder inside the da/db range so the ring is supported and the cage runs clear. A tapered roller bearing has no internal clearance until it is mounted, so the end play or preload is set after the cup is fully seated in its housing.

Interchange guidance

3490 is a dimensionally standardised imperial cone, so FAG 3490, Timken 3490, Koyo 3490, NTN 4T-3490, Bower/BCA 3490 and Federal-Mogul 3490 interchange with one another and with any maker’s 3420, 3422 or 3426 cup. 3491 and 3492 are related sizes, not equivalents. Note also that 3420 and 3426 are near-identical in outside diameter but are separate catalogue cups — order by number, not by measured diameter.