Flanged Linear Bushings
Product name | Flanged Linear Bushings - Double Type |
Part number | LHFRWM16G |
Features | Easy to assemble with bolt-on flanges. The Opposite Counterbored Hole Type is also available. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Easy to assemble with bolt-on flanges.
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Available sizes
■Flanged Linear Bushings - Double Type
Type | Outer Cylinder | Ball | Retainer | Operating Ambient Temperature | Accessory |
Material | Hardness | Surface Treatment | Material | Material |
Round Flange Square Flange Compact Flange | 52100 Bearing Steel Equivalent | 58HRC- | - | 52100 Bearing Steel Equivalent | Plastic (Duracon M90 equivalent) | -20-80℃ | Seal: Material Nitrile Rubber (-20-120℃) |
Stainless Steel (SUS) | -20-100℃ |
Electroless Nickel Plating | 440C Stainless Steel Equivalent | Plastic (Duracon M90 equivalent) | -20-80℃ |
Stainless Steel (SUS) | -20-100℃ |
440C Stainless Steel Equivalent | 56HRC- | - | Plastic (Duracon M90 equivalent) | -20-80℃ |
Stainless Steel (SUS) | -20-100℃ |
■Sizes and Dimensions
I.D. (mm) | Length (mm) |
3 | 19 |
4 | 23 |
5 | 28 |
6 | 35 |
8 | 45 |
10 | 55 |
12 | 57 |
13 | 61 |
16 | 70 |
20 | 80 |
25 | 112 |
30 | 123 |
35 | 135 |
40 | 151 |
50 | 192 |
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Selection steps
■Linear bushing selection steps
- Determine conditions of use.
- (Loads, Motion pattern, Life hours).
↓
- Temporarily select the specifications of linear bushings.
- (Shaft dia. and length are temporarily selected according to the conditions of use.).
↓
- Basic safety check.
-
- ●Basic Static Load Rating.
- ●Basic Dynamic Load Rating.
- ●Allowable Static Moment.
- ●Operating Life.
↓
- Considerations Based on Required Performance.
- ●Life Variations Due to Temperature Changes.
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Accuracy Info
■Accuracy Info. of Flanged Linear Bushings
(mm)
I.D. | I.D. Tolerance | Height Tolerance from Base Surface |
3 | 0 -0.010 | ±0.3 |
4 |
5 |
6 |
8 |
10 |
12 |
13 |
16 |
20 | 0 -0.012 |
25 |
30 |
35 | 0 -0.015 |
40 |
50 |
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Speeds / Loads (Load Info.).
■Speeds / Loads (Load Info.) of Flanged Linear Bushings
I.D. (mm) | Basic Load Rating |
Basic Dynamic Load Rating (N) | Basic Static Load Rating (N) |
3 | 138 | 210 |
4 | 176 | 254 |
5 | 263 | 412 |
6 | 324 | 529 |
8 | 431 | 784 |
10 | 588 | 1100 |
12 | 657 | 1200 |
13 | 813 | 1570 |
16 | 1230 | 2350 |
20 | 1400 | 2740 |
25 | 1560 | 3140 |
30 | 2490 | 5490 |
35 | 2650 | 6270 |
40 | 3430 | 8040 |
50 | 6080 | 15900 |
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Technical calculations
■Life of Flanged Linear Bushings
When the linear system is in motion with applied load, the rolling surfaces and races are subject to repeated stress, This stress can cause scale-like flaking due to material fatigue. The total run distance until the flaking appears in the "Life" of the linear system.
Rated life can be calculated with the basic dynamic load rating and the actual load applied on the linear bushings, as shown below.
- L: Rated Life (km).
- fH: Hardness Factor (See Fig.1).
- fT: Temperature Factor (See Fig.2).
- fC: Contact Factor (See Table-3).
- fW: Load Factor (See Table-4).
- C: Basic Dynamic Load Rating (N).
- P: Applied Load (N).
●Hardness factor (fH)
For linear applications, the linear shaft must have sufficient hardness. If it does not, the load rating decreases and the life will be reduced.
Fig. 1. Hardness Factor.
●Temperature factor (fT)
When the temperature of the linear system exceeds 100 degrees C, the hardness will decrease and as a result, the allowable load and life will reduced.
Fig. 2. Temperature Factor.
●Contact factor (fC)
In general, it is common to use two or more bushings on one shaft. In these cases, the load on each bushing will vary depending on the machining precision and will not have equally distributed loads. As a result, the allowable load per bushing will vary depending on the number of bushings used on the shafts. Please compensate the rated life with contact factors on Table-1.
Table-3. Contact Factor.
Number of Bearings Installed on One Shaft | Contact factor fC |
1 | 1 |
2 | 0.81 |
3 | 0.72 |
4 | 0.66 |
5 | 0.61 |
●Load Factor (fW)
To calculate the load applied to the bushings, in addition to the object weight, the inertia force attributed to the motion velocity, moment loads and the variations of each over time must be obtained. However, for reciprocating motion applications, it is difficult to obtain accurate calculations due to the effects of the vibrations and shocks. Therefor, use Table 2 to simplify the life calculations.
Conditions of Use | fw |
No shocks vibrations,low speed: 15 m/min. or less | 1.0~1.5 |
No significant shocks vibrations,medium speed: 60 m/min. or less | 1.5~2.0 |
With shocks vibrations, high speed: 60 m/min. or more | 2.0~3.5 |
Life in hours can be obtained by calculating the travel distance per hour. When the stroke length and the number of strokes are constant, it can be calculated using the formula below.
- Lh: Life (Hr.).
- L: Rated Life (km).
- Ls: Stroke length (m).
- n1: Number of cycles per minute (cpm).
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