RHP7918CTDUMP4Angular Contact Ball Bearing Matched Pair – Straight Bore, 90 mm ID, 125 mm OD, 18 mm Width, Open, 15° Contact Angle, Medium Preload

Product Description

What this part is:

The RHP 7918CTDUMP4 is a super-precision angular contact ball bearing supplied as a matched duplex pair (DUM, medium preload). Unit Quantity: 2 Pcs. Series: 7900, ISO dimension series 19. Bore Diameter: 90 mm. Outside Diameter: 125 mm. Width: 18 mm per bearing; Total Width: 36 mm for the pair. Contact Angle: 15°. Country of Origin: United Kingdom.

Decoding the designation:

7918 — ISO dimension series 19, bore code 18, giving 90 x 125 x 18 mm.

C — 15° contact angle.

T — machined laminated phenolic resin cage, outer-ring guided.

DU — matched duplex pair with universal face control.

M — medium preload.

P4 — ISO Class 4, equal to RHP EP7 and ABEC 7.

Specifications:

Dynamic Load Rating: 41,500 N (41.5 kN) per bearing. Static Load Rating: 46,000 N (46.0 kN) per bearing. Limiting Speed, single bearing: 15,400 rpm oil/air; 9,500 rpm grease. Limiting Speed, medium-preload pair (0.60 factor): 9,240 rpm oil/air; 5,700 rpm grease. Preload: Medium (M), 740 N axial. Axial Stiffness: 156 N/µm as a medium-preload pair. Precision Class: P4 (ABEC 7). Cage Material: Laminated phenolic resin. Cage Type: Machined, outer-ring guided. Bearing Material: Chrome bearing steel, SAE 52100. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bore Type: Straight. Closure Type: Open. Item Weight: 0.559 kg (1.23 lb) per bearing; 1.118 kg (2.46 lb) per pair.

Dimensions and mounting:

Shaft abutment diameter d1: 97 mm minimum. Housing abutment diameter D1: 118 mm maximum. Outer ring abutment D2: 120 mm maximum. Fillet radius r: 1.5 mm minimum. Fillet radius r1: 0.6 mm minimum. Effective load centre a: 23.4 mm. Internal free volume: 25.6 cm³ per bearing. Lubrication jet pitch circle: 102.8 mm.

Compatibility and replacement:

Cross-references at 15° and medium preload: SKF 71918 CD/P4ADGB; Fafnir 2MM9318WICR-DUM; NSK 7918CTRDUMP4; FAG B71918-C-T-P4S-UM. Also written 7918-C-T-DUM-P4, 71918C and 7918X2. RHP 7918A5TDUMP4 shares the envelope at 25°.

Frequently asked questions:

What are the dimensions of the RHP 7918CTDUMP4?

Each bearing is 90 mm bore, 125 mm outside diameter and 18 mm wide. The pair is 36 mm wide in total.

What are the contact angle and preload?

The C in the designation is a 15° contact angle. DUM is a duplex universal pair at medium preload, 740 N axial.

What are the load ratings?

Per bearing, Dynamic Load Rating is 41,500 N and Static Load Rating is 46,000 N, from the RHP/NSK super-precision catalogue.