RHPB7918X2TADUMSuper Precision Angular Contact Ball Bearing – 90 mm ID, 125 mm OD, 18 mm Width, 15° Contact Angle, Medium Preload, ABEC 7

Product Description

What this part is:

RHP B7918X2TADUM matched pair of single-row super-precision angular contact ball bearings, 2 Pcs, made in the United Kingdom. Bore 90 mm, outside diameter 125 mm, width 18 mm, open, straight bore. Series 79, ISO dimension series 19. RHP is an NSK brand.

Decoding the designation:

B-7918-X2-TA-DUM-EP7 — RHP B-series order code. The same bearing is written 7918CTDUMP4 in RHP’s current scheme.

7 — single-row angular contact ball bearing.

9 — ISO dimension series 19; bore code 18 gives a 90 mm bore.

X2 — 15° contact angle (C in the current scheme).

TA — outer-ring-guided laminated phenolic resin cage.

DU — universally matched pair.

M — medium preload.

EP7 — BS292 precision grade, equal to P4 and ABEC 7.

Specifications:

Bore Diameter: 90 mm. Outside Diameter: 125 mm. Overall Width: 18 mm. Contact Angle: 15°. Precision Class: ABEC 7 / P4. Dynamic Load Rating: 41,500 N per bearing. Static Load Rating: 46,000 N per bearing. Limiting Speed, single bearing under light spring preload: 15,400 rpm oil-air; 9,500 rpm grease. Reference Speed, mounted medium-preload back-to-back pair (factor 0.60): 9,240 rpm oil-air; 5,700 rpm grease. Cage Material: Laminated phenolic resin. Cage Type: Outer-ring guided. Preload: Medium. Axial Preload: 740 N for the mounted pair. Axial Stiffness: 156 N/µm. Maximum Operating Temperature: 120 °C. Bearing Material: Carbon chrome bearing steel to BS970 534A99/535A99, equivalent to SAE 52100, through hardened. Item Weight: 1.12 kg (2.47 lb) for the pair, 0.559 kg (1.23 lb) each. Unit Quantity: 2 Pcs.

Dimensions and mounting:

Bore Type: Straight. Closure Type: Open. Minimum Shaft Abutment Diameter: 97 mm. Maximum Housing Abutment Diameter: 118 mm. Maximum Outer Ring Abutment Diameter: 120 mm. Chamfer r min: 1.5 mm. Chamfer r1 min: 0.6 mm. Effective Load Centre a: 23.4 mm. Internal Volume: 25.6 cm³. Pitch Circle Diameter Of Lubrication Jets: 102.8 mm. Universally faced rings: the pair mounts back-to-back or face-to-face without altering the preload value.

Compatibility and replacement:

Cross-references: SKF 71918CD/P4ADGB, FAG B71918C.T.P4S.DUM. The designation is also written B7918X2TADUM, B-7918-X2-TA-DUM-EP7, 7918CTDUMP4 and 71918C.

Frequently asked questions:

What are the size and contact angle of the RHP B7918X2TADUM?

Bore 90 mm, outside diameter 125 mm, width 18 mm, with a 15° contact angle, supplied as a matched pair of 2 Pcs.

What are the load ratings and speeds of the RHP B7918X2TADUM?

Dynamic 41,500 N and static 46,000 N per bearing. Limiting speed of a single bearing is 15,400 rpm oil-air and 9,500 rpm grease; the mounted medium-preload pair is 9,240 rpm oil-air and 5,700 rpm grease.

What do DU and M mean in B7918X2TADUM?

DU marks a universally matched pair and M is medium preload, with an axial preload of 740 N for the mounted pair.