Bower3576Imperial Tapered Roller Bearing Cone, 1.6250 in / 41.275 mm Bore, Mates Cup 3520 – 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

3576 is a standard imperial cone number in the 35xx family. Its matching cup is 3520, so a complete single-row bearing is a 3576 cone plus a 3520 cup. Cup 3525 is also listed against this cone as an alternative outer race.

Published dimensions

Cone bore (d): 1.6250 in / 41.275 mm
Inner ring width (B): 1.2160 in / 30.886 mm
Mating cup 3520 outside diameter (D): 3.3125 in / 84.138 mm
Mating cup 3520 width (C): 0.9375 in / 23.813 mm
Cone weight: 1.4 lb / 0.6 kg

Published ratings and mounting data

The ratings below are catalogue values for the complete 3576/3520 single-row assembly, not for the cone alone.

Dynamic radial rating C1 (1 million rev basis): 25,500 lbf / 113,000 N
Dynamic radial rating C90 (90 million rev basis): 6,610 lbf / 29,400 N
Dynamic axial rating Ca90: 3,460 lbf / 15,400 N
Static radial rating C0: 30,100 lbf / 134,000 N
K factor: 1.91 · e: 0.31 · Y: 1.96 · geometry factor Cg: 0.0808
Effective load centre: −0.40 in / −10.2 mm (inside the cone backface)
Maximum shaft fillet radius cleared: 0.03 in / 0.80 mm
Shaft backing shoulder diameter, frontface (da): 1.89 in / 48 mm
Shaft backing shoulder diameter, backface (db): 1.93 in / 49 mm

What these specs mean in practice

This is an unusually wide cone for its bore — 1.2160 in of inner ring on a 1.6250 in shaft — and the static rating of 30,100 lbf exceeding the dynamic C1 tells you it was designed for shock and slow-speed overload rather than high-speed fatigue life. The K factor of 1.91 keeps it radially biased, so it generates relatively little induced thrust on its opposing bearing. Watch the 0.03 in maximum shaft fillet radius: it is very tight, and an over-generous machined radius or a leftover shoulder burr will hold this cone off its seat.

Quantity and configuration

This listing ships 1 Pc — one 3576 cone. No cup, no spacer, no seal.

Fitting notes

Press the cone on square with the driver bearing on the backface only, never on the rollers or cage. Keep the shaft shoulder within the da/db range. Because a tapered roller bearing has no internal clearance until it is mounted, the end play or preload is set after the cup is seated in its housing.

Interchange guidance

Bower Roller Bearing became part of Federal-Mogul and traded as BCA before the line moved into NTN, so Bower, BCA and NTN numbers on this part all trace to the same lineage. 3576 is dimensionally standardised, so Bower 3576, Timken 3576, Koyo 3576, NTN 4T-3576 and Federal-Mogul 3576 interchange with one another and with any maker’s 3520 cup. 3577 and 3577X are related sizes, not equivalents — same family, different inner ring width — so match the exact number when the setting matters.