SKF 61805 deep groove ball bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Deep groove ball bearings
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Other brands for this category
Ask us for alternatives. We check every equivalent against the part number and your application.
SKF and FAG: matching part numbers →SKF and TIMKEN: matching part numbers →SKF and RKB: matching part numbers →
Can't find the exact model? Tell us the part number or model you need. We'll track it down and quote it, whether or not it appears in our catalog.
Decoding SKF 61805
- 618Series
- Deep groove ball bearings, 618 series. Series differ in outside diameter and width even when the bore is the same.
- 05Bore
- Bore 25 mm (05 × 5).
61805 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF 61805 measures 25 mm across the bore and 37 mm across the outside diameter; its width is 7 mm (25 x 37 x 7 mm).
SKF 61805 belongs to deep groove ball bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 61805 and any equivalents.
A deep groove ball bearing is the workhorse of rotating equipment. It handles radial load plus a degree of axial load in either direction, tolerates high speed, and keeps a simple construction that makes it the least expensive option among ball bearings.
Reading the designation helps you order the right part. The first digits give the series, which sets width and load capacity. Next comes the coded bore diameter. Suffixes then tell you how the bearing is protected and what internal clearance it has. Two contact rubber seals appear as 2RS or 2RSH. Two non-contact metal shields appear as ZZ or 2Z. No suffix means an open bearing with no protection of its own. A C3 suffix, or another clearance number, signals internal clearance above normal, which suits a shaft that will run hot.
You will find these bearings in electric motors, pumps, fans, gearboxes and conveyor belts, and on practically any shaft turning at medium or high speed under moderate load. That range is why they cover most standard motors and gearboxes found on the market, and why they are the most common bearing held in an industrial warehouse.
Selection comes down to three things: shaft diameter, the load the bearing will carry, and the surrounding environment. A motor in a dusty or damp area calls for 2RS sealing. A high-speed shaft in a clean setting can use ZZ shielding, which produces less friction. Speed and operating temperature also determine the factory grease, and in a sealed bearing that grease cannot be replenished.
The design is among the most standardized in the industry. Inner diameter, outer diameter and width are made to matching numeric series by SKF, NSK, FAG, NTN, Timken and other manufacturers. If your equipment carries a different brand's designation, send that part number and there is usually a direct equivalent.
If you have the number stamped on the bearing or the shaft diameter, message us on WhatsApp with the part number. We will confirm the sealing options and the equivalent. We supply SKF deep groove ball bearings, from the smallest bores to the largest.
Dimensions
25 x 37 x 7 mm (d x D x B): boundary dimensions for basic designation 61805, according to ISO 15.
- Bore
- 25mm
- Outside diameter (D)
- 37mm
- Width (B)
- 7mm
Same size, other brands
Other brands' pages with basic designation 61805: 25 x 37 x 7 mm (d x D x B) per ISO 15.
- FAG6180561805-2Z61805-2RSR
- RKB61805
- TIMKEN61805
What they share are the ISO 15 boundary dimensions, not the specs: seals or shields, internal clearance, cage and load rating may vary with brand and suffix. Every quote is by full part number.
Frequently asked questions
- SKF 61805 bearing: what are its dimensions?
- SKF 61805 measures 25 mm across the bore and 37 mm across the outside diameter; its width is 7 mm (25 x 37 x 7 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 61805.
- How do 2RS and ZZ differ?
- 2RS means two rubber seals touching the inner ring, giving better protection against dust and moisture. ZZ means two non-contact metal shields, which create less friction but keep more contamination out than nothing at all. Match the choice to the working environment.
- What is the purpose of the C3 suffix?
- It marks internal clearance above the standard value. It is specified when the shaft and bearing will warm up during operation, since thermal expansion eats into the running clearance.
- Is it possible to swap another brand's bearing for an SKF one?
- Yes. Dimensions follow standardized series across manufacturers. Confirm bore, outer diameter, width and the sealing you need, and we will point you to the matching option.