61936-ZZ bearing: complete specifications & equivalents
The 61936-ZZ is a ISO 15 radial bearing sized 180 x 250 x 33 mm (bore x OD x width) with ZZ sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NSK |
| Bore diameter d | 180 mm |
| Outer diameter D | 250 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 131 kN |
| Basic static load rating C0 | 128 kN |
| Mass | 4160 g |
| Manufacturer designation | NSK 6936ZZ |
| Standard | ISO 15 |
| Catalog version | NSK Rolling Bearings E1103 Part C |
| Last verified | 2026-09-24 |
Source: catalog reference (NSK Rolling Bearings E1103 Part C) · extracted 2026-09-24
Dimensions in inches & 61900-series range
| Bore d | 7.087 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 1.299 in |
| ISO bore code | 36 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in 61900-series | 10 mm |
| Largest outer diameter in 61900-series | 420 mm |
| Width range across 61900-series | 6–56 mm |
| Bore position in 61900-series (smallest first) | 30 of 37 |
| Bore above smallest 61900-series size | 170 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61936 | ISO-INTERCHANGE | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 envelope interchange; NSK suffix 6936ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 61936-ZZ model number is decoded
In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61936 carries bore code 36 = 180 mm. Outside diameter 250 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.
Typical equipment & failure modes
Common applications
- textile machinery
- packaging machinery
- space-constrained gearboxes
- clutch and transmission assemblies
Known failure patterns
- fine-particle abrasion when non-contact shields let dust past in dirty duty
- grease aging in the shield-for-life cavity with no relubrication path
- cage damage from operation beyond the limiting speed
- electrical pitting in VFD-driven motors without grounding protection
Selection pitfalls — read before you substitute
- Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.
- The 619xx thin section (35.0 mm section height at 180 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.
- ZZ shields are non-contact: 61936-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61936-2RS for that.
- Shielded 61936-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.
- Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.
- NSK catalogues the shielded version as 6936ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.
- The 131/128 kN ratings, mass 4160 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6936ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive.
Frequently asked questions
What are the dimensions of a 61936-ZZ bearing?
A 61936-ZZ deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields.
How does the 61936 bore code work?
The last two digits of 61936 are bore code 36, giving 36 × 5 = 180 mm bore. The 250 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone.
What does the ZZ suffix on 61936-ZZ mean?
ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing.
How does the 61900 compare with other series at the same 180 mm bore?
619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated.
What is the NSK designation and catalogue data for 61936-ZZ?
In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6936ZZ — two non-contact steel shields (NSK suffix ZZ), 180×250×33 mm per ISO 15. Quoted values: C 131 kN, C0 128 kN, mass 4160 g. The industry-neutral page spelling 61936-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service.
Reviewed & verified by the MPN Base engineering desk against source catalog NSK Rolling Bearings E1103 Part C on 2026-09-24. Read our editorial & correction policy.