GCr15 Bearing Steel LM Series Linear Ball Bushings
Grade, hardness, corrosion behavior, service temperature and the full bore range for this material.
GCr15 Bearing Steel LM Series Linear Ball Bushings are made from GCr15 (GB/T 18254) = 100Cr6 (1.3505) = SAE 52100, through-hardened to 58–64 HRC. Corrosion behavior: none of its own — the ground surfaces are bare hardened steel and depend on the lubricant, the seals and the preservative for protection. The material is magnetic, and the usable service range is to about +120 °C as normally heat stabilized; stabilized rings (S1, S2 and above) extend the limit in steps to around +250 °C. In practice this material is the default material for the rings and rolling elements of virtually every standard rolling bearing.
None of its own — the ground surfaces are bare hardened steel and depend on the lubricant, the seals and the preservative for protection
Magnetic response
Magnetic
Service temperature
to about +120 °C as normally heat stabilized; stabilized rings (S1, S2 and above) extend the limit in steps to around +250 °C
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.
Material specification page for lm series linear ball bushings in GCr15 Bearing Steel. Covers the grade designation (GCr15 (GB/T 18254) = 100Cr6 (1.3505) = SAE 52100, through-hardened to 58–64 HRC), what the material does inside the bearing, its temperature and environmental limits, the alternatives worth considering, and the sizes available to JIS B 1516 / ISO 10285.
Why GCr15 Bearing Steel for LM Series Linear Ball Bushings
The default material for the rings and rolling elements of virtually every standard rolling bearing. In a lm series linear ball bushings it is the steel of the rings and, in most designs, of the rolling elements.
Through-hardened high-carbon chromium steel is what a raceway is: hard enough to resist the rolling contact stress, clean enough after modern vacuum degassing that the inclusions which start fatigue cracks are rare, and dimensionally stable after tempering so the ground bore stays the size it was ground to.
To about +120 °C as normally heat stabilized; stabilized rings (S1, S2 and above) extend the limit in steps to around +250 °C
Corrosion characteristic
None of its own — the ground surfaces are bare hardened steel and depend on the lubricant, the seals and the preservative for protection
Alternatives and When to Switch
Move to case-hardened steel where the ring section is heavy or the load is shocked; to 440C where the environment is wet or the part must not rust; and to a hybrid bearing with ceramic balls where the speed, the electrical environment or the lubrication regime is beyond what a steel ball will tolerate.
What the Material Changes About the Bearing
The material does not change the envelope: the bore, the outside diameter, the width and the corner radius stay exactly as the boundary dimension standard fixes them, so the bearing is interchangeable with any other bearing of the same designation. What it changes is what happens inside the contact — the fatigue behavior, the tolerance of shock, and the temperature at which the ring stops being dimensionally stable.
Sizes of LM Series Linear Ball Bushings Available in GCr15 Bearing Steel
Designation
Shaft diameter d (mm)
Outer diameter D (mm)
Length L (mm)
Snap ring groove diameter (mm)
Snap ring groove position (mm)
LM6UU
6
12
19
11.5
13.5
LM8UU
8
15
24
14.3
17.5
LM10UU
10
19
29
18
22
LM12UU
12
21
30
20
23
LM13UU
13
23
32
22
23.4
LM16UU
16
28
37
27
26.5
LM20UU
20
32
42
30.5
30.5
LM25UU
25
40
59
38
41
LM30UU
30
45
64
43
44.5
LM35UU
35
52
70
49
49
LM40UU
40
60
80
57
60.5
LM50UU
50
80
100
76.5
74
Other ways to specify the LM Series Linear Ball Bushings
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.
Request a Quote
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (JIS B 1516 / ISO 10285)
Designation
Shaft diameter d (mm)
Outer diameter D (mm)
Length L (mm)
Snap ring groove diameter (mm)
Snap ring groove position (mm)
LM6UU
6
12
19
11.5
13.5
LM8UU
8
15
24
14.3
17.5
LM10UU
10
19
29
18
22
LM12UU
12
21
30
20
23
LM13UU
13
23
32
22
23.4
LM16UU
16
28
37
27
26.5
LM20UU
20
32
42
30.5
30.5
LM25UU
25
40
59
38
41
LM30UU
30
45
64
43
44.5
LM35UU
35
52
70
49
49
LM40UU
40
60
80
57
60.5
LM50UU
50
80
100
76.5
74
Video: GCr15 Bearing Steel LM Series Linear Ball Bushings
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 GCr15 Bearing Steel change the dimensions or the rating?
The material does not change the envelope: the bore, the outside diameter, the width and the corner radius stay exactly as the boundary dimension standard fixes them, so the bearing is interchangeable with any other bearing of the same designation. What it changes is what happens inside the contact — the fatigue behavior, the tolerance of shock, and the temperature at which the ring stops being dimensionally stable.
What hardness are bearing rings?
A through-hardened bearing ring is typically 58–64 HRC, and a case-hardened one reaches the same hardness at the surface over a much softer, tougher core. Below about 58 HRC a raceway starts to deform under rolling contact rather than to resist it.
Can a standard bearing run above 120 °C?
Not without being ordered for it. Standard rings are heat stabilized for use to about +120 °C; above that they grow and lose their fit unless a stabilized version is specified. The grease, the seals and a polymer cage usually reach their limits at or below that temperature too.
Are GCr15 Bearing Steel LM Series Linear Ball Bushings magnetic?
GCr15 Bearing Steel 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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