INAZL5204DRSStud Type Track Roller – 52 mm OD, 20 mm Stud, Double Row Angular Contact Ball, Sealed, Crowned Outer Ring

Product Description

What this part is

INA ZL5204DRS is a stud type track roller. Outside Diameter: 52 mm. Stud fit diameter: 20 mm. Overall Width: 45.3 mm. Outer ring width: 20.6 mm. Rolling Elements: Ball. Number Of Rows: 2. Closure Type: Lip seal on the stud side, sealing shield with cover on the end face. Bearing Material: Chrome steel. Item Weight: 0.25 kg (0.55 lb).

Decoding the designation

ZL52 — Stud type track roller with a double-row, self-retaining angular contact ball complement inside a particularly thick-walled outer ring. The balls themselves provide the axial guidance of the outer ring.

04 — Size code. Stud fit diameter 20 mm.

DRS — Lip seal on the stud side with axial sealing action, plus a sealing shield with a cover on the end face. The execution has no relubrication facility, so it runs on its factory grease charge.

What these specs mean in practice

Dynamic Load Rating: 16,000 N. Static Load Rating: 10,800 N. Speed on permanent grease lubrication: 5,000 rpm. Fatigue load limit, radial: 560 N. Lubricant: Grease.

The stud carries the roller directly, so one part replaces a pin, a bearing and a retaining arrangement. The outer ring outside profile is crowned to a 500 mm radius, which keeps contact away from the ring edges when the track runs slightly out of parallel.

Series: ZL52. Base Number: ZL5204.

Mounting data

Stud fit diameter 20 mm with an effective length of 20 mm and an inner thread 18 mm deep. Total length 43 mm. Thrust washer stop diameter 26.8 mm; maximum thrust washer width 25.5 mm. The outer ring stands 4 mm proud of the thrust washer. A mounting slot is provided in the face for fitting. Minimum chamfer dimension 1 mm.

The stud is solid and short, with a threaded hole rather than an external thread, so the roller bolts through from behind the mounting plate.

Quantity and configuration

Unit Quantity: 1 Pc. Complete roller: stud, double-row ball complement, thick-walled outer ring, lip seal and end cover.

Interchange guidance

Cross-references on stud type track rollers are deliberately few. Stud length, thread form, crown radius and outer ring wall thickness all vary between makers, and each of those decides whether a roller fits and survives on a given track. The INA ZL5204-DRS supersedes the ZL 5204 KRDU, which is the number to search on older drawings. The INA KRV52 and McGill CF series rollers of similar outside diameter are related sizes with different stud arrangements rather than interchanges.

Searchable forms of the number: ZL5204DRS, ZL5204-DRS, ZL-5204-DRS, ZL 5204 DRS, ZL 5204 KRDU, ZL5204.