NSK7920A5TYSULP4Angular Contact Ball Bearing – Straight Bore, 100 mm ID, 140 mm OD, 20 mm Width, Open, 25° Contact Angle, Light Preload Universal Single.

Product Description

What this part is

NSK 7920A5TYSULP4 super-precision angular contact ball bearing, 100 mm bore × 140 mm outside diameter × 20 mm width. Series: 7900, the ISO 19 dimension series, equivalent to 71920. Contact Angle: 25°. Precision Class: P4, ABEC 7. Preload: light. Straight bore, open on both faces.

Decoding the designation

Base Number: 7920A5. A5: 25° contact angle. TY: ball-guided cage. SUL: single universally ground bearing at light preload. P4: ISO Class 4, ABEC 7. The number is also written 7920-A5TY-SUL-P4, 7920 A5TY SUL P4 and 7920A5TY SUL P4.

What these specs mean in practice

The ISO 19 envelope is a narrow, thin section, which suits a compact spindle housing at high speed. A 25° contact angle carries more thrust and less speed than a 15° bearing on the same envelope. Basic Dynamic Load Rating: 59.5 kN. Basic Static Load Rating: 51.5 kN. Limiting Speed: 8,400 rpm on grease, 12,000 rpm on oil or oil-air. Mass: 0.808 kg.

Quantity and configuration

One bearing, universally ground at light preload. A universal single pairs with any other universal single of the same designation, back-to-back, face-to-face or in tandem, and holds the set preload without a spacer. Universally ground bearings are supplied without a running clearance.

Fitting notes

The inner and outer ring faces are ground with the offset that sets the preload, so the marked faces determine which way the ring goes into the housing.

Interchange guidance

SKF 71920 ACD/P4A DGA is a same-envelope 25° universally matchable single at light preload. Fafnir 3MM9320WI-SUL is the same bearing in the Fafnir 9300WI scheme, which maps to the ISO 719 series. A 7920C on the same envelope carries a 15° contact angle and is a related size.