SKF234410BM1SPDouble-Direction Angular Contact Thrust Ball Bearing – 50 mm ID, 80 mm OD, 38 mm Height, 60° Contact Angle, SP Class

Product Description

What this part is

SKF 234410 BM1/SP super-precision double-direction angular contact thrust ball bearing. Bore Diameter: 50 mm. Outside Diameter: 80 mm. Overall Width: 38 mm. Contact Angle: 60°. Number Of Rows: 2. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Dynamic Load Rating: 22,500 N. Static Load Rating: 60,000 N. Precision Class: SP. Cage Material: Machined brass. Cage Type: Machined. Mounting Arrangement: Double-direction axial, two-piece housing washer. Bearing Material: Bearing steel. Series: 234400. Base Number: 234410. Unit Quantity: 1 Pc.

Decoding the designation

2344 — double-direction angular contact thrust ball bearing for screw drives. Two ball rows run at a steep angle against a two-piece housing washer, so the bearing takes axial load in both directions and locates the screw.

10 — bore code. Bore Diameter: 50 mm.

BM1 — one-piece machined brass cage.

SP — SKF super-precision tolerance class for screw-drive bearings.

Searchable forms of the designation: 234410BM1/SP, 234410 BM1 SP, 234410BM1SP, 234410-BM1-SP, 234410.

What these specs mean in practice

Contact Angle: 60°. A steep angle puts the load line close to the shaft axis, which is what converts a ball bearing into an axial locating element. That is why the 2344 series is used at the fixed end of a ball screw on a machine-tool axis.

Dynamic Load Rating: 22,500 N. Static Load Rating: 60,000 N. Fatigue load limit: 2,850 N. A static rating well above the dynamic rating is the normal pattern for a double-direction thrust bearing, where a large ball count carries a stationary load across two rows.

Preload: 415 N, with a static axial stiffness of 559 N/µm for two bearings set back-to-back or face-to-face. Axial stiffness is the figure that decides how closely a ball-screw axis holds position under cutting load.

The bearing runs 25 balls of 6.35 mm diameter across the two rows.

Mounting data

Bore Diameter: 50 mm, straight. Outside Diameter: 80 mm. Overall height H 38 mm. Combined height of both housing washers 2C 19 mm. Shaft washer shoulder diameter d1 67.5 mm. Housing washer shoulder diameter D1 74.9 mm. Shaft abutment diameter da min 61 mm. Housing abutment diameter Da 74.9 mm minimum to 76 mm maximum. Shaft washer chamfer radius r1,2 min 1 mm. Housing washer chamfer radius r3,4 min 0.3 mm. Fillet radius ra max 1 mm, rb max 0.3 mm. Reference grease quantity 3.3 cm³.

Quantity and configuration

Unit Quantity: 1 Pc. One complete double-direction bearing: one shaft washer, two housing washers and both ball rows with their cage.

Interchange guidance

Cross-Reference 1: SKF BTW 50 CTN9/SP. Cross-Reference 2: FAG 234410-M-SP. Cross-Reference 3: NSK 234410M. Cross-Reference 4: NTN 234410. Cross-Reference 5: Koyo 234410. Cross-Reference 6: Nachi 234410.

All six share the 50 x 80 x 38 mm envelope, the 60° contact angle and the double-direction two-row design. The SKF BTW 50 CTN9/SP is SKF’s own successor to the 234410 BM1/SP and carries a non-metallic cage in place of the machined brass. Fafnir, RHP, MRC and SNR do not build this screw-drive series, so the interchange list stops at six.