SNR7008HG1DUJ84Super Precision Angular Contact Bearing Pair 40x68x15 mm 25° Duplex Universally Ground

Product Description

What this part is:

SNR 7008HG1DUJ84 is a super-precision single-row angular contact ball bearing set, supplied as a universally ground duplex pair of two bearings. Brand: SNR (now NTN-SNR). Series: 70. Base Number: 7008. Bore: 40 mm. Outside Diameter: 68 mm. Width: 15 mm per bearing. Contact Angle: 25°. Preload: Medium. Unit Quantity: 2 Pcs, one matched duplex set.

Decoding the designation:

70 — the 70 dimension series.

08 — 40 mm bore code.

H — 25° contact angle.

DU — a pair of universal bearings, selected so that bore and outside-diameter variation across the set stays within half the ISO tolerance.

J84 — 8 is medium preload and 4 is precision class ISO 4, ABEC 7, P4.

G1 — carried on the carton and kept as a marking variant.

Specifications:

Bore Diameter: 40 mm (1.5748 in). Outside Diameter: 68 mm (2.6772 in). Width: 15 mm (0.5906 in) per bearing. Total Width: 30 mm as a duplex pair. Contact Angle: 25°. Precision Class: ABEC 7 / P4 (ISO 4). Preload: Medium, 119 lbf. Dynamic Load Rating: 20.51 kN (4,610 lbf) per bearing. Static Load Rating: 16.01 kN (3,600 lbf) per bearing. Limiting Speed: 20,000 rpm grease; 30,000 rpm oil, per single bearing. A back-to-back pair at medium preload runs at 0.70 of the single-bearing figure: 14,000 rpm grease and 21,000 rpm oil. A face-to-face pair at medium preload runs at 0.65: 13,000 rpm grease and 19,500 rpm oil. Cage Material: Laminated phenolic resin. Cage Type: Machined, centred on the outer ring. Bearing Material: 52100 vacuum-degassed steel rings and balls. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1 per bearing. Lubricant: Grease or oil.

Dimensions and mounting:

Universal grinding leaves the inner and outer ring faces flush once preloaded, so any two bearings of this designation pair in any orientation and reach the specified medium preload when clamped. The pair mounts back-to-back (DB) for moment stiffness and two-direction thrust, face-to-face (DF) for tolerance of shaft-to-housing misalignment, or in tandem (DT) for doubled thrust capacity in one direction.

Compatibility and replacement:

Same 40 x 68 x 15 mm envelope, 25° angle, P4 class and medium preload: FAG 7008-E-T-P4-DUM, SKF 7008 ACD/P4ADGB, NSK 7008A5TYNDUMP4 (polyamide cage instead of phenolic) and Timken/Fafnir 3MM9108WI CR DUM. In the SKF scheme DGB is the medium preload grade, and in the NSK scheme A5 is the 25° angle. MPN Variants: 7008HG1DUJ84, 7008-H-G1-DU-J84, 7008 H G1 DU J84, 7008HG1DU, 7008HG1.

Frequently asked questions:

What are the contact angle and preload of the SNR 7008HG1DUJ84?

The contact angle is 25° and the preload is medium, 119 lbf.

What are the load ratings and speed limits?

Dynamic Load Rating is 20.51 kN (4,610 lbf) and Static Load Rating is 16.01 kN (3,600 lbf) per bearing. Limiting Speed is 20,000 rpm on grease and 30,000 rpm on oil for a single bearing.

What do the H, DU and J84 in 7008HG1DUJ84 mean?

H is the 25° contact angle, DU is a universally ground duplex pair, and J84 means medium preload with precision class ISO 4 (ABEC 7, P4).