NSK7005CTYDUHP4Super Precision Angular Contact Ball Bearing Matched Duplex Pair 25 x 47 x 12 mm 15 Degree Heavy Preload ABEC 7

Product Description

What this part is

A matched duplex pair of NSK 7005C super-precision angular contact ball bearings, 25 mm bore, 47 mm outside diameter, 12 mm wide each, ground to heavy preload. The 7000 series is the light section of the super-precision angular contact range.

Decoding the designation

In the NSK scheme 7005 is the ISO 70-series section, C sets the contact angle at 15°, TY is an NSK cage code, DU marks the pieces as a ground duplex set, H is heavy preload and P4 is ABEC 7. NSK uses A5 for 25° and A for 30°, so the C here places this at the high-speed end of the range.

What these specs mean in practice

A 15° contact angle gives the highest limiting speed and the lowest axial stiffness of the standard angles. Heavy preload reverses part of that: it raises axial and radial stiffness and cuts deflection under cutting load, at the cost of more running torque, more heat and a lower practical speed than the same bearing at light preload. ABEC 7 holds bore, outside diameter and raceway runout close enough that the pair shares load evenly.

Quantity and configuration

2 Pcs, supplied as one matched duplex set. Ring faces are ground together so the pair reaches the specified heavy preload with the rings clamped solid, without shims or measurement. Stack height for the pair is 24 mm.

Thrust direction

Each bearing on its own takes thrust in one direction. Back-to-back or face-to-face, the pair takes thrust in both directions; in tandem it takes a larger load in one direction only.

Fitting notes

The V etch across the two outer-ring faces aligns to give the ground arrangement. A heavy-preload set runs warmer than a light one, so lubrication quantity and spindle cooling govern the achieved running temperature; the rings clamp solid against the housing shoulder and shaft nut, and seat squareness governs the running accuracy achieved.

Interchange guidance

Direct substitutes are an NSK or RHP 7005C duplex pair at P4 and heavy preload. A 7005A5 at 25° or 7005A at 30° is the same 25 x 47 x 12 mm envelope at a different angle — a related size, not an interchange. Light and medium preload sets of the same number are separate parts, as is the thinner 71905 section.