NTN 1218SK self-aligning ball bearing
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Self-aligning ball bearings
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Decoding NTN 1218SK
- 12Series
- Self-aligning ball bearings, 12 series. Series differ in outside diameter and width even when the bore is the same.
- 18Bore
- Bore 90 mm (18 × 5).
- SKSuffix
- NTN suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
1218 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NTN 1218SK measures 90 mm across the bore and 160 mm across the outside diameter; its width is 30 mm (90 x 160 x 30 mm).
NTN 1218SK belongs to self-aligning 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 1218SK and any equivalents.
The NTN SK series is a self-aligning ball bearing with two rows of balls. It handles radial loads while compensating for angular misalignment between shaft and housing. The spherical outer raceway lets the inner ring oscillate, so mounting errors or shaft deflection are absorbed. Typical uses include fans, pumps, conveyors and agricultural machinery.
Reading the SK code is straightforward. The basic number gives the size and load capacity; the SK suffix means a tapered bore with 1:12 taper. Models like 1204SK, 1205SK and 1206SK share that suffix, so they mount directly on tapered shafts or with adapter sleeves. A higher basic number means a larger bore and more capacity.
In US plants, these bearings appear in industrial fans, centrifugal pumps, belt conveyors, vibrating screens and farm equipment. Their self-aligning action suits long shafts that deflect or housings that are not perfectly machined. You also find them in textile machines, industrial washers and process equipment where alignment varies. MR Industrial Accessories LLC supplies them for replacement and new projects across the United States and in several Latin American countries.
When selecting an SK bearing, review radial and axial load, speed and sealing needs. The 1:12 tapered bore requires a tapered shaft or an adapter sleeve; check tightening torque and concentricity. Grease or oil lubrication is possible, and internal clearance is set during mounting. Initial alignment is less critical, but keep the misalignment angle within permissible limits. For dusty or humid areas, pick sealed or protected variants.
NTN SK series bearings interchange with other brands that use the same dimensional nomenclature and SK suffix. For replacement, compare main dimensions, bore type and internal clearance. If your original part number is from another brand, MR can identify the compatible equivalent. Interchangeability is not always direct, so verify tolerances and original lubrication. Send the part number or bearing dimensions for accurate identification.
To request a quote for an NTN SK series self-aligning ball bearing, message us on WhatsApp or email with the part number or the shaft and housing dimensions. MR Industrial Accessories LLC quotes the exact reference and advises on mounting and lubrication. We also help identify the part if you do not have the number at hand.
Dimensions
90 x 160 x 30 mm (d x D x B): boundary dimensions for basic designation 1218, according to ISO 15.
- Bore
- 90 mm
- Outside diameter (D)
- 160mm
- Width (B)
- 30mm
SKF and other brands, same size
Other brands' pages with basic designation 1218: 90 x 160 x 30 mm (d x D x B) per ISO 15.
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 1218SK bearing: what are its dimensions?
- NTN 1218SK measures 90 mm across the bore and 160 mm across the outside diameter; its width is 30 mm (90 x 160 x 30 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 1218.
- What does the SK suffix mean on a self-aligning bearing?
- The SK suffix indicates a tapered bore with 1:12 taper. This allows mounting on a tapered shaft or with an adapter sleeve, which helps adjust internal clearance and secure the bearing on the shaft.
- How do I choose the right SK bearing for my application?
- Consider radial and axial load, speed, shaft diameter and environmental conditions. The tapered bore requires a compatible shaft or sleeve. For dusty or humid environments, choose sealed variants. At MR we advise based on your equipment.
- Are NTN SK series bearings interchangeable with other brands?
- They are interchangeable with bearings from other brands that share the same dimensional nomenclature and the SK suffix. When replacing, check dimensions, bore type and internal clearance. If you have another brand's part number, we can tell you the equivalent.