SKF 3318 DMA double row angular contact ball bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Double row angular contact ball bearings
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Decoding SKF 3318 DMA
- 33Series
- Double row angular contact ball bearings, 33 series. Series differ in outside diameter and width even when the bore is the same.
- 18Bore
- Bore 90 mm (18 × 5).
- DMASuffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
3318 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF 3318 DMA measures 90 mm across the bore and 190 mm across the outside diameter; its width is 73 mm (90 x 190 x 73 mm).
SKF 3318 DMA belongs to double row angular contact 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 3318 DMA and any equivalents.
When a machine has to take radial and axial forces at the same time, and the axial force can push either way, an SKF double row angular contact bearing is often the answer. Two rows of balls share the work, so the bearing carries more than a single row unit of the same envelope while keeping the rigidity and precision that demanding equipment needs. It suits compact assemblies where reliability matters.
Reading the code is the first step in choosing a replacement. Take 3309 DMA and 3310 DMA: the leading pair of digits identifies the double row type, the digit that follows sets the dimension series, and the DMA suffix covers internal details such as cage design or internal clearance, defined by SKF for each variant. Match the full designation, not just the base number.
These bearings show up in metallurgy, cement, paper and material handling plants. They are common in gearboxes, high-flow pumps, industrial fans and machine tools, where the direction of the axial force changes or reverses during operation. That ability to take axial load in both directions is what makes them useful in such drives.
Selection comes down to load size and direction, rotation speed and the working environment. Where dust or moisture is present, sealed or shielded variants are the better choice. Use the lubricant the manufacturer recommends, align the mounting carefully to avoid extra stress, and confirm the internal clearance: the wrong clearance shortens bearing service life.
If you are comparing with another brand, check the main dimensions and the execution type rather than the suffix alone, since suffixes do not always match between manufacturers. MR Industrial Accessories LLC supplies SKF bearings. Send the complete code by WhatsApp or email and the team will reply promptly, suggest equivalents and help you pick the right option for the application.
Dimensions
90 x 190 x 73 mm (d x D x B): boundary dimensions for basic designation 3318, according to ISO 15.
- Bore
- 90mm
- Outside diameter (D)
- 190mm
- Width (B)
- 73mm
Frequently asked questions
- SKF 3318 DMA bearing: what are its dimensions?
- SKF 3318 DMA measures 90 mm across the bore and 190 mm across the outside diameter; its width is 73 mm (90 x 190 x 73 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 3318.
- What does the DMA suffix mean on an SKF bearing?
- It marks a specific execution defined by SKF, which can involve the cage type, internal clearance or particular tolerances. Check the complete designation on your bearing and send it to us for confirmation.
- Does this bearing support axial loads in both directions?
- Yes. Double row angular contact bearings take axial loads in both directions as well as radial loads, which is why they work in applications with reversing forces.
- How do I choose between a single row and a double row bearing?
- It depends on the axial and radial load, the space available and the rigidity required. The double row version handles higher loads in both directions and is stiffer, but needs more axial space.