Original unbranded angular contact bearing concept visualization

BEARING SPECIFICATION / 7311

7311 Angular Contact Ball Bearing

55 × 120 × 29 mm · Combined loads. Controlled axial support. Compare the sourced reference data and specify your SANJ requirement.

Original product concept visualization

7311 angular contact ball bearing — retouched source reference image; supply configuration may differ — AI-retouched source reference image. Packaging and marks removed; configuration may differ from SANJ supply.

7311 dimensional schematic: bore 55 mm, outside diameter 120 mm, width 29 mm — Boundary dimension schematic · not a manufacturing drawing · not to scale

Angular Contact Ball Bearings

7311 at a glance

7311 identifies a angular contact ball bearing reference with 55 mm bore, 120 mm outside diameter and 29 mm overall width or height.

Bore / d: 55 mm
Outside / D: 120 mm
Width / B: 29 mm

A contact angle supports combined radial and axial loads. A single row supports axial load in one direction; paired arrangements require preload and matching to be specified.

Enquire about 7311 ↗Download reference data ↓

Reference configuration: 7311
Ratings below belong to the identified JTEKT / Koyo source record. SANJ material, internal design, performance and supply scope require a confirmed quotation and datasheet.

TECHNICAL SOURCEJTEKT / Koyo · 7311 ↗Source checked 2026-10-20Reference image source ↗

REFERENCE SPECIFICATION

All the details.
One clear source.

Full factual values from the source designation 7311. Mounting dimensions and reference mass relate to that design; they must be checked against the final SANJ drawing.

Load ratings: kN · dimensions: mm · speed: min⁻¹ · mass: kg

7311 — JTEKT / Koyo reference data
Parameter	Reference value
d	55 mm
D	120 mm
B	29 mm
r(min.)	2 mm
r1(min.)	1 mm
Basic load ratings : Cr	107 kN
Basic load ratings : C0r	61.7 kN
Fatigue load limit : Cu	4.30 kN
factor : f0	-
Limiting speeds(Grease lub.)	5300 min-1
Limiting speeds(Oil lub.)	6700 min-1
Load center spread : a	40.2 mm
da(min.)	65 mm
Da(max.)	110 mm
ra(max.)	2 mm
Mass(Refer.)	1.45 kg

SELECTION CONTEXT

Match the bearing
to its duty.

7311 belongs to the angular contact ball bearings family. Its reference envelope is 55 mm bore, 120 mm outside diameter and 29 mm overall width or height.

A contact angle supports combined radial and axial loads. A single row supports axial load in one direction; paired arrangements require preload and matching to be specified.

For a manufacturing enquiry, provide the complete designation and operating conditions. Matching the dimensional envelope alone does not confirm interchangeability or equivalent performance.

Is the same size a direct replacement?

No. Matching 55 × 120 × 29 mm establishes the boundary dimensions. The full designation, tolerances, clearance, contact angle or roller arrangement, seals, cage, lubrication and performance must also be checked.

Understand bearing load ratings →

PREPARE A USEFUL ENQUIRY

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number leaves open.

A complete brief reduces assumptions and gives the quotation a clear technical basis.

Configuration

Full designation, seals or shields, accuracy, clearance, cage, material and any matched arrangement.

Operating duty

Radial and axial loads, speed, temperature, lubrication, fits, environment and expected service.

Supply requirement

Quantity, destination, packing, inspection records, drawing approval and delivery requirement.

7311 Angular Contact Ball Bearing

7311 at a glance

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Is the same size a direct replacement?

Specify what the modelnumber leaves open.

Configuration

Operating duty

Supply requirement

More in this bearing family.

7308 ↗

7309 ↗

7310 ↗

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Match the bearing
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number leaves open.