EPTF - Zhejiang Savi Technology Co., Ltd.

It has a wide range of applications, suitable for automated mass production, special machinery manufacturing, underwater applications, food and pharmaceutical packaging industries. It can also perform well in extreme environments, meeting requirements such as corrosion resistance, chemical resistance, high-temperature resistance, low-temperature resistance, dust resistance, shock resistance and noise reduction.

About us

A national high-tech enterprise integrating the R&D, production and sales of professional maintenance-free self-lubricating materials. The company has obtained IATF 16949:2016 certification. For many years, Savi has been committed to optimizing the friction and wear properties of engineering plastics to meet industrial application requirements. Our main products include engineering plastic self-lubricating bearings, engineering plastic linear guide systems, engineering plastic spherical plain bearings, various series of wear-resistant rods, plates and wear-resistant granules.

A national high-tech enterprise integrating the research and development, production and sales of professional maintenance-free self-lubricating materials. The company has been certified to IATF 16949:2016. For many years, Savi has been dedicated to optimizing the friction and wear performance of engineering plastics for industrial applications. Our main products cover engineering plastic self-lubricating bearings, engineering plastic linear guide systems, engineering plastic spherical plain bearings, various series of wear-resistant rods, sheets and wear-resistant pellets.

Spec. Code	d1	d2	L	d3	t	d1 Tol. after Press-fit	d1 Tol. after Press-fit	Housing Bore H7	Housing Bore H7	Shaft Dia. h9	Shaft Dia. h9
NO.	mm	mm	mm	mm	mm	Min.	Max.	Min.	Max.	Min.	Max.
EPTF-0304-03	3	4.5	3	7.5	0.75	3.014	3.054	4.5	4.512	2.975	3
EPTF-0304-05	3	4.5	5	7.5	0.75	3.014	3.054	4.5	4.512	2.975	3
EPTF-0405-03	4	5.5	3	9.5	0.75	4.02	4.068	5.5	5.512	3.97	4
EPTF-0405-04	4	5.5	4	9.5	0.75	4.02	4.068	5.5	5.512	3.97	4
EPTF-0405-05	4	5.5	5	9.5	0.75	4.02	4.068	5.5	5.512	3.97	4
EPTF-0506-05	5	6	5	10	0.5	5.01	5.04	6	6.012	4.97	5
EPTF-0506-08	5	6	8	10	0.5	5.01	5.04	6	6.012	4.97	5
EPTF-0507-05	5	7	5	11	1	5.01	5.04	7	7.015	4.97	5
EPTF-0608-04	6	8	4	12	1	6.02	6.068	8	8.015	5.97	6
EPTF-0608-06	6	8	6	12	1	6.02	6.068	8	8.015	5.97	6
EPTF-0608-08	6	8	8	12	1	6.02	6.068	8	8.015	5.97	6
EPTF-0608-10	6	8	10	12	1	6.02	6.068	8	8.015	5.97	6
EPTF-0610-06	6	10	6	14	2	6.03	6.105	10	10.015	5.97	6
EPTF-0810-05	8	10	5	15	1	8.025	8.083	10	10.015	7.964	8
EPTF-0810-06	8	10	6	15	1	8.025	8.083	10	10.015	7.964	8
EPTF-0810-07	8	10	7	15	1	8.025	8.083	10	10.015	7.964	8
EPTF-0810-08	8	10	8	15	1	8.025	8.083	10	10.015	7.964	8
EPTF-0810-09	8	10	9	15	1	8.025	8.083	10	10.015	7.964	8
EPTF-0810-10	8	10	10	15	1	8.025	8.083	10	10.015	7.964	8
EPTF-0812-10	8	12	10	16	2	8.013	8.071	12	12.018	7.964	8
EPTF-1012-05	10	12	5	18	1	10.025	10.083	12	12.018	9.964	10
EPTF-1012-07	10	12	7	18	1	10.025	10.083	12	12.018	9.964	10
EPTF-1012-09	10	12	9	18	1	10.025	10.083	12	12.018	9.964	10
EPTF-1012-10	10	12	10	18	1	10.025	10.083	12	12.018	9.964	10
EPTF-1012-12	10	12	12	18	1	10.025	10.083	12	12.018	9.964	10
EPTF-1012-15	10	12	15	18	1	10.025	10.083	12	12.018	9.964	10
EPTF-1012-17	10	12	17	18	1	10.025	10.083	12	12.018	9.964	10
EPTF-1214-04	12	14	4	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1214-05	12	14	5	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1214-07	12	14	7	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1214-09	12	14	9	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1214-12	12	14	12	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1214-15	12	14	15	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1214-17	12	14	17	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1214-20	12	14	20	20	1	12.032	12.102	14	14.018	11.957	12
EPTF-1416-10	14	16	10	22	1	14.032	14.102	16	16.018	13.957	14
EPTF-1416-12	14	16	12	22	1	14.032	14.102	16	16.018	13.957	14
EPTF-1416-17	14	16	17	22	1	14.032	14.102	16	16.018	13.957	14
EPTF-1517-09	15	17	9	23	1	15.032	15.102	17	17.018	14.957	15
EPTF-1517-12	15	17	12	23	1	15.032	15.102	17	17.018	14.957	15
EPTF-1517-17	15	17	17	23	1	15.032	15.102	17	17.018	14.957	15
EPTF-1618-06	16	18	6	24	1	16.032	16.102	18	18.018	15.957	16
EPTF-1618-12	16	18	12	24	1	16.032	16.102	18	18.018	15.957	16
EPTF-1618-16	16	18	16	24	1	16.032	16.102	18	18.018	15.957	16
EPTF-1618-17	16	18	17	24	1	16.032	16.102	18	18.018	15.957	16
EPTF-1618-21	16	18	21	24	1	16.032	16.102	18	18.018	15.957	16
EPTF-1820-12	18	20	12	26	1	18.032	18.102	20	20.021	17.957	18
EPTF-1820-17	18	20	17	26	1	18.032	18.102	20	20.021	17.957	18
EPTF-1820-22	18	20	22	26	1	18.032	18.102	20	20.021	17.957	18
EPTF-2023-11.5	20	23	11.5	30	1.5	20.04	20.124	23	23.021	19.948	20
EPTF-2023-15.5	20	23	15.5	30	1.5	20.04	20.124	23	23.021	19.948	20
EPTF-2023-16.5	20	23	16.5	30	1.5	20.04	20.124	23	23.021	19.948	20
EPTF-2023-21	20	23	21	30	1.5	20.04	20.124	23	23.021	19.948	20
EPTF-2026-20	20	26	20	32	3	20.065	20.195	26	26.021	19.948	20
EPTF-2528-11.5	25	28	11.5	35	1.5	25.04	25.124	28	28.021	24.948	25
EPTF-2528-12	25	28	12	35	1.5	25.04	25.124	28	28.021	24.948	25
EPTF-2528-14.5	25	28	14.5	35	1.5	25.04	25.124	28	28.021	24.948	25
EPTF-2528-21	25	28	21	35	1.5	25.04	25.124	28	28.021	24.948	25
EPTF-2532-25	25	32	25	38	4	25.065	25.195	32	32.025	24.948	25
EPTF-3034-16	30	34	16	42	2	30.04	30.124	34	34.025	29.948	30
EPTF-3034-20	30	34	20	42	2	30.04	30.124	34	34.025	29.948	30
EPTF-3034-26	30	34	26	42	2	30.04	30.124	34	34.025	29.948	30
EPTF-3034-37	30	34	37	42	2	30.04	30.124	34	34.025	29.948	30
EPTF-3236-16	32	36	16	40	2	32.05	32.15	36	36.025	31.938	32
EPTF-3236-26	32	36	26	40	2	32.05	32.15	36	36.025	31.938	32
EPTF-3539-12	35	39	12	47	2	35.05	35.15	39	39.025	34.938	35
EPTF-3539-16	35	39	16	47	2	35.05	35.15	39	39.025	34.938	35
EPTF-3539-26	35	39	26	47	2	35.05	35.15	39	39.025	34.938	35
EPTF-4044-20	40	44	20	52	2	40.05	40.15	44	44.025	39.938	40
EPTF-4044-30	40	44	30	52	2	40.05	40.15	44	44.025	39.938	40
EPTF-4044-40	40	44	40	52	2	40.05	40.15	44	44.025	39.938	40
EPTF-4550-12	45	50	12	58	2	45.05	45.15	50	50.025	44.938	45
EPTF-4550-20	45	50	20	58	2	45.05	45.15	50	50.025	44.938	45
EPTF-4550-50	45	50	50	58	2	45.05	45.15	50	50.025	44.938	45
EPTF-5055-20	50	55	20	63	2	50.05	50.15	55	55.03	49.938	50
EPTF-5055-30	50	55	30	63	2	50.05	50.15	55	55.03	49.938	50
EPTF-5055-50	50	55	50	63	2	50.05	50.15	55	55.03	49.938	50
EPTF-6065-50	60	65	50	73	2	60.06	60.18	65	65.03	59.926	60
EPTF-7075-50	70	75	50	83	2	70.06	70.18	75	75.03	69.926	70

Spec. Code

d1 Tol. after Press-fit

Housing Bore H7

Shaft Dia. h9

NO.

Min.

Max.

Min.

Max.

Min.

Max.

EPTF-0304-03

4.5

7.5

0.75

3.014

3.054

4.5

4.512

2.975

EPTF-0304-05

4.5

7.5

0.75

3.014

3.054

4.5

4.512

2.975

EPTF-0405-03

5.5

9.5

0.75

4.02

4.068

5.5

5.512

3.97

EPTF-0405-04

5.5

9.5

0.75

4.02

4.068

5.5

5.512

3.97

EPTF-0405-05

5.5

9.5

0.75

4.02

4.068

5.5

5.512

3.97

EPTF-0506-05

0.5

5.01

5.04

6.012

4.97

EPTF-0506-08

0.5

5.01

5.04

6.012

4.97

EPTF-0507-05

5.01

5.04

7.015

4.97

EPTF-0608-04

6.02

6.068

8.015

5.97

EPTF-0608-06

6.02

6.068

8.015

5.97

EPTF-0608-08

6.02

6.068

8.015

5.97

EPTF-0608-10

6.02

6.068

8.015

5.97

EPTF-0610-06

6.03

6.105

10.015

5.97

EPTF-0810-05

8.025

8.083

10.015

7.964

EPTF-0810-06

8.025

8.083

10.015

7.964

EPTF-0810-07

8.025

8.083

10.015

7.964

EPTF-0810-08

8.025

8.083

10.015

7.964

EPTF-0810-09

8.025

8.083

10.015

7.964

EPTF-0810-10

8.025

8.083

10.015

7.964

EPTF-0812-10

8.013

8.071

12.018

7.964

EPTF-1012-05

10.025

10.083

12.018

9.964

EPTF-1012-07

10.025

10.083

12.018

9.964

EPTF-1012-09

10.025

10.083

12.018

9.964

EPTF-1012-10

10.025

10.083

12.018

9.964

EPTF-1012-12

10.025

10.083

12.018

9.964

EPTF-1012-15

10.025

10.083

12.018

9.964

EPTF-1012-17

10.025

10.083

12.018

9.964

EPTF-1214-04

12.032

12.102

14.018

11.957

EPTF-1214-05

12.032

12.102

14.018

11.957

EPTF-1214-07

12.032

12.102

14.018

11.957

EPTF-1214-09

12.032

12.102

14.018

11.957

EPTF-1214-12

12.032

12.102

14.018

11.957

EPTF-1214-15

12.032

12.102

14.018

11.957

EPTF-1214-17

12.032

12.102

14.018

11.957

EPTF-1214-20

12.032

12.102

14.018

11.957

EPTF-1416-10

14.032

14.102

16.018

13.957

EPTF-1416-12

14.032

14.102

16.018

13.957

EPTF-1416-17

14.032

14.102

16.018

13.957

EPTF-1517-09

15.032

15.102

17.018

14.957

EPTF-1517-12

15.032

15.102

17.018

14.957

EPTF-1517-17

15.032

15.102

17.018

14.957

EPTF-1618-06

16.032

16.102

18.018

15.957

EPTF-1618-12

16.032

16.102

18.018

15.957

EPTF-1618-16

16.032

16.102

18.018

15.957

EPTF-1618-17

16.032

16.102

18.018

15.957

EPTF-1618-21

16.032

16.102

18.018

15.957

EPTF-1820-12

18.032

18.102

20.021

17.957

EPTF-1820-17

18.032

18.102

20.021

17.957

EPTF-1820-22

18.032

18.102

20.021

17.957

EPTF-2023-11.5

11.5

1.5

20.04

20.124

23.021

19.948

EPTF-2023-15.5

15.5

1.5

20.04

20.124

23.021

19.948

EPTF-2023-16.5

16.5

1.5

20.04

20.124

23.021

19.948

EPTF-2023-21

1.5

20.04

20.124

23.021

19.948

EPTF-2026-20

20.065

20.195

26.021

19.948

EPTF-2528-11.5

11.5

1.5

25.04

25.124

28.021

24.948

EPTF-2528-12

1.5

25.04

25.124

28.021

24.948

EPTF-2528-14.5

14.5

1.5

25.04

25.124

28.021

24.948

EPTF-2528-21

1.5

25.04

25.124

28.021

24.948

EPTF-2532-25

25.065

25.195

32.025

24.948

EPTF-3034-16

30.04

30.124

34.025

29.948

EPTF-3034-20

30.04

30.124

34.025

29.948

EPTF-3034-26

30.04

30.124

34.025

29.948

EPTF-3034-37

30.04

30.124

34.025

29.948

EPTF-3236-16

32.05

32.15

36.025

31.938

EPTF-3236-26

32.05

32.15

36.025

31.938

EPTF-3539-12

35.05

35.15

39.025

34.938

EPTF-3539-16

35.05

35.15

39.025

34.938

EPTF-3539-26

35.05

35.15

39.025

34.938

EPTF-4044-20

40.05

40.15

44.025

39.938

EPTF-4044-30

40.05

40.15

44.025

39.938

EPTF-4044-40

40.05

40.15

44.025

39.938

EPTF-4550-12

45.05

45.15

50.025

44.938

EPTF-4550-20

45.05

45.15

50.025

44.938

EPTF-4550-50

45.05

45.15

50.025

44.938

EPTF-5055-20

50.05

50.15

55.03

49.938

EPTF-5055-30

50.05

50.15

55.03

49.938

EPTF-5055-50

50.05

50.15

55.03

49.938

EPTF-6065-50

60.06

60.18

65.03

59.926

EPTF-7075-50

70.06

70.18

75.03

69.926

Material Prop.	Test Std.	Unit	EPT
Color	-	-	Dark Grey
Density	ISO1183	g /cm³	1.46
Max. Moisture Abs. 50%RH	ISO62	%	0.3
Max. Water Abs.	ISO62	%	1.2
Dynamic Friction vs. Steel	ITSO25	μ	0.05-0.15
Limiting PV Value	ITSO26	N/mm²x m/s	0.4
Flex. Mod.	ISO178	MPa	2300
Flex. Str.	ISO178	MPa	60
Max. Static Load	ITSO27	MPa	35
Max. Dynamic Load	ITSO28	MPa	15
Shore D Hardness	ISO868	D	75
Cont. Oper. Temp.	ITS029	℃	+80
Short-term Oper. Temp.	ITS029	℃	+120
Min. Oper. Temp.	ITSO29	℃	-40
Therm. Cond.	ISO22007	W/(m·K)	0.2
Linear Therm. Exp. Coeff.	ISO11359	K^-1× 10^-5	10
Flamm. Rating	UL94	Class	HB
Vol. Resist.	IEC60093	Ω.cm	>10¹³
Surf. Resist.	IEC60093	Ω	>10¹²

Bearing PV Value

The maximum operating PV value of EPT series bearings is 0.4 N/mm²·m/s. This means the load borne by the bearing is inversely proportional to its speed. Refer to Chart EPT-1 for details.

Bearing Load, Speed and Temperature

The EPT series bearings can withstand a maximum static load of 35 MPa. Refer to Chart EPT-2 for the maximum compression set of the bearing under this load. The actual working load of the bearing should be slightly less than 35 MPa. The load is also affected by operating speed and temperature. Higher speed (Vmax: 1.0 m/s) will increase frictional temperature, and rising temperature (Tmax: 80℃) will gradually reduce the bearing load capacity. Refer to Chart EPT-3 for the variation of load with bearing operating temperature.

Bearing Coefficient of Friction

The coefficient of friction of EPT bearings is relatively less affected by changes in operating speed and bearing load (see Charts EPT-4 and EPT-5). This is one of the reasons why EPT is selected as a general-purpose plastic bearing grade. This bearing maintains a relatively low coefficient of friction to ensure superior friction and wear performance. As shown in Chart EPT-6, the coefficient of friction of EPT bearings varies with the surface roughness of the mating shaft. We recommend a shaft surface roughness of Ra 0.3~0.5 μm for this bearing.

EPT	Dry Run	Grease	Oil	Water
Friction Coeff. μ	0.05-0.15	0.09	0.04	0.04

Wear and Shaft Material

Shaft material has a significant influence on bearing wear. However, EPT bearings are compatible with nearly all shaft materials. As shown in Charts EPT-7 and EPT-8, EPT bearings exhibit excellent wear characteristics when used with hard chrome-plated steel shafts, hardened steel shafts and hardened aluminum shafts.

Chemical Resistance

EPT plastic bearings are resistant to corrosion from weak alkalis, weak acids and various lubricating oils.

Water Absorption

At standard atmospheric pressure, the moisture absorption rate of EPT plastic bearings is 0.3%, and the maximum water absorption rate when immersed in water is 1.2%. Its low water absorption rate requires bearing design modifications only in extreme applications.

UV Resistance

When EPT is exposed to ultraviolet radiation for a long time, its color basically remains unchanged. The material’s hardness, compressive strength and wear resistance stay unchanged.

Installation Tolerance

Tolerance of EPT plastic bearings after press-fit

Dia. [mm]	EPT E10 [mm]	Housing Bore H7 [mm]	Shaft Dia. h9 [mm]
> 0~3	+0.014~+0.054	0~+0.010	0~-0.025
> 3~6	+0.020~+0.068	0~+0.012	0~-0.030
> 6~10	+0.025~+0.083	0~+0.015	0~-0.036
> 10~18	+0.032~+0.102	0~+0.018	0~-0.043
> 18~30	+0.040~+0.124	0~+0.021	0~-0.052
> 30~50	+0.050~+0.150	0~+0.025	0~-0.062
> 50~80	+0.060~+0.180	0~+0.030	0~-0.074
> 80~120	+0.072~+0.212	0~+0.035	0~-0.087
> 120~180	+0.085~+0.245	0~+0.040	0~-0.100

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