NTN 21312K spherical roller bearing
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Spherical roller bearings
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Decoding NTN 21312K
- 213Series
- Spherical roller bearings, 213 series. Series differ in outside diameter and width even when the bore is the same.
- 12Bore
- Bore 60 mm (12 × 5).
- KSuffix
- NTN suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
21312 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NTN 21312K measures 60 mm across the bore and 130 mm across the outside diameter; its width is 31 mm (60 x 130 x 31 mm).
NTN 21312K belongs to spherical roller 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 21312K and any equivalents.
Spherical roller bearings in the NTN K series are self-aligning, two-row components built to carry high radial loads together with axial loads in either direction, and they keep working when the shaft and housing are not perfectly aligned. This makes them a practical choice for heavy equipment where shaft deflection or mounting error is a real condition. MR Industrial Accessories LLC supplies this line to industrial users across the United States and in several Latin American countries.
Reading the designation is the first step. The number identifies the series and the bore size in millimeters, while the K suffix signals a tapered bore with a 1:12 taper. In 239/500K, 239/530K and 239/560K, the bore diameters are 500 mm, 530 mm and 560 mm respectively. That tapered bore is what allows mounting on a tapered shaft or with an adapter sleeve, which simplifies both clearance adjustment and later disassembly.
Typical service is in steel, cement, mining, paper, cranes and heavy transmission work. Large gearboxes, mills, rotary kilns and conveyors are common homes for these bearings. Because they tolerate misalignment, they suit long shafts that deflect under load, a situation where rigid bearing types cannot follow the movement.
Selection should consider radial and axial load, rotation speed and the surrounding environment. In dusty or humid locations, sealing deserves attention, and sealed or shielded configurations may be the better choice. Grease or oil lubrication both apply, and internal clearance has to match the duty. When the bore is tapered, correct tightening of the adapter sleeve is what produces the right residual clearance.
On interchangeability, NTN K series spherical roller bearings correspond to other brands using the same ISO designation, such as SKF, FAG or NSK, as long as dimensions and suffixes agree. For a replacement, confirm the full part number and tolerances. If you are working from another brand's reference, our team can point you to the compatible option.
To request a quote, send the complete part number by WhatsApp or email to MR Industrial Accessories LLC. The team replies promptly and can suggest equivalents or help you choose. If the exact reference is not at hand, send the model or the dimensions instead and we will help you source it.
Dimensions
60 x 130 x 31 mm (d x D x B): boundary dimensions for basic designation 21312, according to ISO 15.
- Bore
- 60 mm
- Outside diameter (D)
- 130mm
- Width (B)
- 31mm
SKF and other brands, same size
Other brands' pages with basic designation 21312: 60 x 130 x 31 mm (d x D x B) per ISO 15.
- Need the SKF 21312? We can also quote:21312 E21312 EK21312 E/C32 more →
- FAG21312-E1-XL21312-E1-XL-K
- NSK21312EAE421312EAKE4
- RKB21312
- TIMKEN21312EJ
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
- NTN 21312K bearing: what are its dimensions?
- NTN 21312K measures 60 mm across the bore and 130 mm across the outside diameter; its width is 31 mm (60 x 130 x 31 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 21312.
- What does the K suffix indicate on these bearings?
- It indicates a tapered bore with a 1:12 taper. The bearing can then be mounted on a tapered shaft or with an adapter sleeve, which makes internal clearance adjustment and disassembly easier.
- Can these bearings replace those from other brands?
- Yes, NTN K series spherical roller bearings are interchangeable with bearings from other brands that follow the same ISO designation, such as SKF, FAG or NSK, provided dimensions and suffixes match. Verify the complete part number.
- How do I request a quote for a bearing from this series?
- Send the complete part number, for example 239/500K, by WhatsApp or email. If you do not have the part number, send the dimensions or the equipment model and we will help you source it.