Bearing Snap Ring Groove vs. Snap Ring

Bearing Snap Ring Groove vs. Snap Ring Introduction:

In bearing design and installation, the terms snap ring groove and snap ring are often mentioned together. However, they are not the same thing. The bearing snap ring groove is the machined channel on the bearing ring, while the bearing snap ring is the removable retaining ring fitted into that groove. Together, they help position the bearing, prevent axial movement, and simplify mounting inside the housing.

Understanding the difference between the groove and the snap ring is important when selecting bearings such as N-type bearings and NR-type bearings, especially for applications requiring compact design and reliable axial location.

What Is a Bearing Snap Ring Groove?

A bearing snap ring groove is a circular groove machined into the bearing ring, most commonly on the outer ring of the bearing. Its main purpose is to provide a seat for the snap ring.
The groove itself does not usually perform the retaining function alone. Instead, it allows a snap ring to be installed securely on the bearing. Once the snap ring is fitted into the groove, it creates a locating shoulder that helps position the bearing inside the housing.

Bearings with a snap ring groove are commonly found in:

• Deep groove ball bearings
• Cylindrical roller bearings
• Certain special-purpose industrial bearings

In bearing suffixes, N usually indicates a bearing with a snap ring groove on the outer ring.
For example:

• 6205N: bearing with a snap ring groove
• 6017N: bearing with a snap ring groove

However, the N suffix usually means the bearing has the groove only, and the snap ring may need to be ordered separately.

What Is a Bearing Snap Ring?

A bearing snap ring, also called a retaining ring or circlip, is a removable metal ring installed into the snap ring groove. Its function is to help locate and retain the bearing axially in the housing.
When the snap ring is fitted into the groove, part of the ring protrudes from the bearing outer diameter. This protruding section acts as a shoulder or stop, preventing the bearing from moving too far in one axial direction.

The snap ring is especially useful when:

• The housing does not have a machined shoulder
• Space is limited
• Fast assembly is required
• The bearing needs simple axial positioning
• Maintenance and replacement should be convenient

In bearing suffixes, NR usually means the bearing has both a snap ring groove and a snap ring.
For example:

• 6205NR: bearing with a snap ring groove and snap ring
• 6308NR: bearing with a snap ring groove and snap ring

Key Difference:

In simple terms, the groove holds the snap ring, and the snap ring holds the bearing in position.

N vs NR Bearing: What Do These Suffixes Mean?

Bearing suffixes help identify whether the bearing includes a snap ring groove or a snap ring.

Main Functions of a Snap Ring Groove and Snap Ring:

1. Axial Positioning
The snap ring and groove help locate the bearing inside the housing. Once installed, the snap ring acts as a stop and prevents the bearing from shifting out of its designed position.

2. Preventing Axial Movement
Bearings may experience vibration, impact, and axial forces during operation. A snap ring can help reduce unwanted axial movement and keep the bearing properly seated.