NHBBME-11908DLMatched Duplex Pair Super-Precision Angular Contact Ball Bearings 40x62x12 mm 15° Light Preload ABEC 7

Product Description

What this part is

NHBB ME-11908-DL, a matched duplex pair of single-row super-precision angular contact ball bearings. Boundary dimensions 40 mm bore × 62 mm outside diameter × 12 mm width per bearing. The ISO-scheme equivalent designation is 71908-C-TPA-P4-DUL.

Decoding the designation

ME – NHBB metric super-precision angular contact series
119 – 71900 ultra-light section in the NHBB scheme
08 – bore code, 08 × 5 = 40 mm bore
D – duplex, a pair ground to run together
L – light preload
71908-C – ISO form of the same bearing, where C = 15° contact angle
TPA – fabric-reinforced phenolic cage
P4 – ABEC 7 precision class

What these specs mean in practice

The 71900 ultra-light section puts a 40 mm bore inside a 62 mm outside diameter and only 12 mm of width, which is what makes it a spindle and instrument-drive bearing rather than a load-carrying one. A 15° contact angle favours speed and radial stiffness over thrust capacity. Light preload holds the balls in defined contact with minimum friction and heat, so the pair runs cool at speed while still removing axial play. A fabric-reinforced phenolic cage is light, self-lubricating and well suited to high-speed grease operation.

Published specifications

Bore: 40 mm (1.5748 in)
Outside diameter: 62 mm (2.4409 in)
Width: 12 mm (0.4724 in) per bearing
Total width mounted: 24 mm (0.9449 in)
Contact angle: 15°
Rows: 1 per bearing
Preload: light (L)
Precision class: P4 (ABEC 7)
Cage: fabric-reinforced phenolic (TPA)
Closure: open

Quantity and configuration

2 Pcs, one matched duplex pair.

Fitting notes

The pair mounts as a unit in the marked orientation with the ground faces together, so preload comes from the matched ring-face offset rather than from clamp-up force. Rings of this section are thin, so the shaft and housing seats carry the roundness: an out-of-round seat transfers straight into the ball path. Full preload develops once the inner rings are clamped solid against the shaft shoulder and the outer rings against the housing shoulder.

Interchange guidance

Same-spec 15° light-preload duplex equivalents in other schemes: FAG B71908-C-T-P4S-UL, NSK 71908CTYDULP4, SKF 71908 CD/P4ADGA in its light-preload form, Barden 1908HDL. Medium and heavy preload forms, the 25° 71908-E form, and the heavier 7008 section on the same bore are related sizes rather than interchanges.