NSK FIR-404530 inner ring
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Inner ring
- Series
- FIR
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Description
NSK FIR-404530 belongs to inner ring, 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 FIR-404530 and any equivalents.
An NSK FIR series inner ring is the hardened, ground raceway that mounts on a shaft inside a needle roller bearing. It is the right choice when the shaft itself is not hard or ground enough to serve as a running surface. MR Industrial Accessories LLC supplies this series and helps you confirm the code that fits your application.
Reading the FIR code is the fastest way to narrow down a replacement. The prefix FIR is fixed, followed by a hyphen and a numeric block that varies in format: FIR-5812-1, FIR-5816-1, FIR-10158-2, FIR-071010, FIR-071012, FIR-71012-1, FIR-071015 and FIR-71016-1 all belong to the same family. Those digits can point to bore, width or machining details, so treat each code as a specific size and verify it against the drawing or the original part.
You will find these rings in machine tools, pumps, compressors, gearboxes, conveyors, and agricultural and textile machinery. Their job is simple: give the needle rollers a hard, ground track when the shaft lacks the required hardness or finish. That protects the shaft from premature wear and keeps the bearing running as intended.
When selecting, check the shaft diameter, the bearing width and the load type. Tolerance and fit matter, because the ring must sit with enough interference to stay put without deforming. Lubrication and alignment also affect performance, and a misaligned mount can introduce unexpected axial loads. If a shaft is already worn, an inner ring is a practical way to restore the raceway surface.
Other brands offer inner rings with similar nomenclature, but there is no universal cross-reference; each maker sets its own codes and dimensions. To replace a ring from another brand, send the original code or the shaft and bearing dimensions so the correct part can be identified.
If you have the NSK FIR code, send it on WhatsApp or by email and the team will quote it promptly. Without the code, share the dimensions or a photo of the part and we will help you identify it and advise on selection and mounting.
Dimensions
Dimensions and tolerances: Message us the part number on WhatsApp and we'll verify its dimensions and version with the manufacturer's datasheet.
Frequently asked questions
- How do I identify the inner ring I need?
- Start with the complete code on the part or on the bearing. If it is not available, send the shaft diameter, the width and the bearing outer diameter, or a photo. With that information the corresponding FIR code can be provided.
- What is the difference between a FIR inner ring and a complete needle roller bearing?
- The inner ring is only the raceway that mounts on the shaft. A complete needle roller bearing includes the outer ring, the needles and sometimes the inner ring. When the shaft is not hardened, the ring prevents wear.
- Are NSK FIR series inner rings interchangeable with other brands?
- There is no universal interchangeability. Each manufacturer defines its own dimensions and tolerances. To replace a ring from another brand, send the original code or the dimensions and a suitable compatible option can be quoted.