Martensitic Stainless 440C 29400 Series Thrust Spherical Roller Bearings
Grade, hardness, corrosion behavior, service temperature and the full bore range for this material.
Martensitic Stainless 440C 29400 Series Thrust Spherical Roller Bearings are made from AISI 440C = X105CrMo17 (1.4125), hardened and tempered — the only common stainless hard enough to form a rolling raceway. Corrosion behavior: good in water, steam, mild chemicals and food service; it is a hardenable stainless, so it holds less chromium in solution than 304 and will stain in standing chlorides. The material is magnetic, and the usable service range is about -30 °C to +180 °C in ordinary bearing service, the lubricant usually deciding before the steel does. In practice this material is the standard corrosion-resistant bearing steel; a stainless bearing is rated below the same envelope in GCr15, so take its load ratings from the stainless table and never from the chrome steel one.
Material
AISI 440C = X105CrMo17 (1.4125), hardened and tempered — the only common stainless hard enough to form a rolling raceway
Corrosion resistance
Good in water, steam, mild chemicals and food service; it is a hardenable stainless, so it holds less chromium in solution than 304 and will stain in standing chlorides
Magnetic response
Magnetic
Service temperature
about -30 °C to +180 °C in ordinary bearing service, the lubricant usually deciding before the steel does
Property figures are typical for the material. In an assembled bearing the lubricant, the seals and the cage frequently reach their limits before the material does, so check all four against the duty. Material certification is available on request for production orders.
Martensitic Stainless 440C 29400 Series Thrust Spherical Roller Bearings are dimensioned to ISO 104 / DIN 728 / GB/T 5859 exactly as the standard version is: the material changes the properties, never the envelope. What it does change — good in water, steam, mild chemicals and food service; it is a hardenable stainless, so it holds less chromium in solution than 304 and will stain in standing chlorides, magnetic and the service range about -30 °C to +180 °C in ordinary bearing service, the lubricant usually deciding before the steel does — is set out below with the full size chart.
Why Martensitic Stainless 440C for 29400 Series Thrust Spherical Roller Bearings
The standard corrosion-resistant bearing steel; a stainless bearing is rated below the same envelope in GCr15, so take its load ratings from the stainless table and never from the chrome steel one. In a 29400 series thrust spherical roller bearings it is the ring and rolling element steel of the corrosion-resistant version.
It is the compromise that makes a corrosion-resistant rolling bearing possible: enough carbon to be hardened to a raceway hardness, enough chromium to resist water and mild chemicals. Everything else about the bearing — the envelope, the tolerance class, the clearance group — is unchanged.
Material Properties
Grade designation
AISI 440C = X105CrMo17 (1.4125), hardened and tempered — the only common stainless hard enough to form a rolling raceway
Magnetic response
Magnetic
Service temperature
About -30 °C to +180 °C in ordinary bearing service, the lubricant usually deciding before the steel does
Corrosion characteristic
Good in water, steam, mild chemicals and food service; it is a hardenable stainless, so it holds less chromium in solution than 304 and will stain in standing chlorides
Alternatives and When to Switch
If the load matters more than the corrosion, go back to GCr15 with the right seals and a corrosion-inhibiting grease — a sealed chrome steel bearing outlasts a stainless one in many "wet" applications that are only occasionally wet. If the corrosion matters more than the load, go past stainless: a full ceramic or a polymer-housed bearing does not corrode at all.
What the Material Changes About the Bearing
The envelope is unchanged and the bearing drops into the same seat, but the load ratings are not the chrome steel ratings and must not be carried across. Expect a lower rating, a slightly lower temperature ceiling, and — in exchange — a bearing that survives the wash, the condensation or the food process that would rust a standard one.
Sizes of 29400 Series Thrust Spherical Roller Bearings Available in Martensitic Stainless 440C
Designation
Bore d (mm)
Outer diameter D (mm)
Height H (mm)
Chamfer r min (mm)
29413
65
140
45
3
29414
70
150
48
3
29415
75
160
51
3
29416
80
170
54
3
29417
85
180
58
3
29418
90
190
60
3
29420
100
210
67
4
29422
110
230
73
4
29424
120
250
78
4
29426
130
270
85
5
29428
140
280
85
5
29430
150
300
90
5
29432
160
320
95
5
29434
170
340
103
5
29436
180
360
109
5
Other ways to specify the 29400 Series Thrust Spherical Roller Bearings
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the designation snaps the other fields to that size's standard values; you can then override any individual value.
Sends the selected values to the quote form below.
Our facility
Held in production, not just on paper
The tolerances above are decided on the grinding and superfinishing lines in our own plant, and gauged on every ring rather than on a sample. A dimension is only worth quoting if it survives the process that produces it.
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The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (ISO 104 / DIN 728 / GB/T 5859)
Designation
Bore d (mm)
Outer diameter D (mm)
Height H (mm)
Chamfer r min (mm)
29413
65
140
45
3
29414
70
150
48
3
29415
75
160
51
3
29416
80
170
54
3
29417
85
180
58
3
29418
90
190
60
3
29420
100
210
67
4
29422
110
230
73
4
29424
120
250
78
4
29426
130
270
85
5
29428
140
280
85
5
29430
150
300
90
5
29432
160
320
95
5
29434
170
340
103
5
29436
180
360
109
5
Video: Martensitic Stainless 440C 29400 Series Thrust Spherical Roller Bearings
Third-party video, selected automatically for this topic. It is not produced by Bushing Bearings and is not a specification source — use the tables on this page for dimensional data.
Frequently Asked Questions
Does Martensitic Stainless 440C change the dimensions or the rating?
The envelope is unchanged and the bearing drops into the same seat, but the load ratings are not the chrome steel ratings and must not be carried across. Expect a lower rating, a slightly lower temperature ceiling, and — in exchange — a bearing that survives the wash, the condensation or the food process that would rust a standard one.
Is a stainless bearing suitable for food processing?
Martensitic 440C is the usual raceway material for a corrosion-resistant bearing and is widely used in food machinery, with a food-grade grease and the appropriate seals. Where the wash is aggressive or standing chlorides are present, a full ceramic bearing or a polymer housed unit is the more durable answer than any hardenable stainless.
Can a stainless bearing carry the same load as a chrome steel one?
No. A stainless bearing of the same envelope is rated below its chrome steel equivalent, so its ratings must be taken from the stainless table. It is specified for the environment, not for the load.
Are Martensitic Stainless 440C 29400 Series Thrust Spherical Roller Bearings magnetic?
Martensitic Stainless 440C is magnetic.
How do I request a quotation?
Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.
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