SKFBR3782Imperial Tapered Roller Bearing Cone, 1.7500 in / 44.450 mm Bore, Mates Cup 3720 – 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 here.

Decoding the designation

The BR prefix is SKF’s designation for its inch-series tapered roller bearing range; the meaningful part of the number is 3782, the standard imperial cone number used across the industry. Its matching cup is 3720, so a complete single-row bearing is a 3782 cone plus a 3720 cup. BR3782 and 3782 are the same part under two naming conventions.

Published dimensions

Cone bore (d): 1.7500 in / 44.450 mm
Inner ring width (B): 1.1930 in / 30.302 mm
Mating cup 3720 outside diameter (D): 3.6718 in / 93.264 mm
Mating cup 3720 width (C): 0.9375 in / 23.813 mm
Cone weight: 4.45 lb / 2.02 kg

Published ratings and mounting data

The ratings below are catalogue values for the complete 3782/3720 single-row assembly, not for the cone alone.

Dynamic radial rating C1 (1 million rev basis): 27,500 lbf / 122,000 N
Dynamic radial rating C90 (90 million rev basis): 7,120 lbf / 31,700 N
Dynamic axial rating Ca90: 4,120 lbf / 18,300 N
Static radial rating C0: 34,300 lbf / 153,000 N
K factor: 1.73 · e: 0.34 · Y: 1.77 · geometry factor Cg: 0.0903
Effective load centre: −0.32 in / −8.1 mm (inside the cone backface)
Maximum shaft fillet radius cleared: 0.14 in / 3.600 mm
Shaft backing shoulder diameter, frontface (da): 2.05 in / 52 mm
Shaft backing shoulder diameter, backface (db): 2.28 in / 58 mm

What these specs mean in practice

This is a wide, heavily loaded cone — 1.1930 in of inner ring width on a 1.7500 in bore — which is why the static rating of 34,300 lbf is higher than the C1 dynamic figure. That combination suits shock-loaded, slow or intermittently rotating positions such as final drives, swing gear and press linkages, where the worst case is a stationary overload rather than fatigue. The e value of 0.34 is the point at which thrust starts to govern the calculation; below it you can size on radial load alone.

Quantity and configuration

This listing ships 1 Pc — one 3782 cone. No cup, no spacer, no seal.

Fitting notes

Drive the cone onto the shaft square, bearing on the backface only, never through the rollers. Keep the shaft shoulder within the da/db range so the ring is supported and the cage runs clear. 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

3782 is a standardised imperial cone, so SKF BR3782, Timken 3782, Koyo 3782, NTN 4T-3782, Bower/BCA 3782 and Federal-Mogul 3782 interchange with one another and with any maker’s 3720 cup. Take care with 3767, which is a related size and not an equivalent: it uses the same roller set and the same 3720 cup, but its bore is 2.0625 in instead of 1.7500 in.