Rotary PTFE and Spring Energised Seals

Standard Profiles

Moontown solid PTFE Lip seals provide the designer with a significant improvement in performance over elastomer lip seals at a much lower cost than a mechanical face seal.

Temperature range: 20°C to 250°C
Pressure up to 30 bar
High chemical resistance
Metal support ring for high temperatures
Low friction
Surface speeds up to 25 m/s
Dry running or abrasive media
Easy to install and replace

TYPE M50

TYPE M51

TYPE M50: Shaft speed up to 25 m/s. Maximum pressure = 5 bar. Used in lubricated and non-lubricated applications. Maximum temperature 100°C

TYPE M51: As type M50 but due to the metal support ring can be used up to 200°C or maximum O-ring material temperature.

TYPE M52

TYPE M53

TYPE M52: Improved sealing of gases and abrasive media due to higher lip load. Not recommended for shaft speeds greater than 8 m/s.

TYPE M53: As type M52 but can be used up to 200°C or maximum O-ring material temperature due to metal support ring.

TYPE M54

TYPE M55

TYPE M54: Incorporates spring loading for use in applications where shaft run-out or misalignment exists. Pressures up to 3 bar. Speed up to 7 m/s.

TYPE M55: As type M54 but can be used up to 200°C or maximum O-ring material temperature due to metal support ring.

TYPE M56

TYPE M57

TYPE M56: Shaft speed up to 30 m/s. Maximum pressure 1.5 bar. Low friction seal. Used as environmental seals.

TYPE M57: As type M56 but can be used up to 200°C or maximum O-ring material temperature due to metal support ring.

TYPE M58

TYPE M59

TYPE M58: Used in high pressure hydraulic applications, pumps, hydraulic motors. Operational PV factor 65 bar m/s max.

TYPE M59: As type M58 but the clamping is in the axial direction which requires the gland width to be held to the seal width -0.0/+0.1

Rotary Seals Hardware Design

Rotary Seal Selection Chart

Shaft Material and Hardness	Finish
Cast Iron or Hardenable Steel -40 to 65 HRc with hydraulic oil up to 15 bar -58 to 65 HRc with pressure > 15 bar and non-lubricating or abrasive media.	Shaft Ra 0.3 - 0.5 µm for lubricated applications RA 0.2 - 0.4 µm for non-lubricated or abrasive media RA < 0.2 µm in vacuum Bore or O-Ring Side Ra = 0.8 - 1.6 µm Maximum bore finish of 0.8 - 1.6 µm for utilising a spring energised PTFE seal for OD sealing Preferred finishing method is plunge grinding with no lead

Shaft Material and Hardness

Finish

Cast Iron or Hardenable Steel

-40 to 65 HRc with hydraulic oil up to 15 bar
-58 to 65 HRc with pressure > 15 bar and non-lubricating or abrasive media.

Shaft

Ra 0.3 - 0.5 µm for lubricated applications
RA 0.2 - 0.4 µm for non-lubricated or abrasive media
RA < 0.2 µm in vacuum

Bore or O-Ring Side

Ra = 0.8 - 1.6 µm
Maximum bore finish of 0.8 - 1.6 µm for utilising a spring energised PTFE seal for OD sealing
Preferred finishing method is plunge grinding with no lead

Hardware Dimensions

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
8	22	7
	24
	26
9	22	7
	24
	26
10	22	7
	24
	26
11	22	7
11	26	7
12	22	7
	24
	28
	30
14	24	7
	28
	30
	35
15	26	7
	30
	32
	35
16	28	7
	30
	32
	35
17	28	7
	30
	32
	35
	40
18	30	7
	32
	35
	40
20	30	7
	32
	35
	40
	47
22	32	7
	35
	40
	47
24	35	7
	37
	40
	47
25	35	7
	40
	42
	47
	52
26	37	7
	42
	47

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
28	40	7
	47
	52
30	40	7
	42
	47
	52
	62	8
32	45	7
	47
	52
35	47	7
	50
	52
	62	8
36	47	7
	50
	52
	62	8
38	52	7
	55	8
	62	8
40	52	7
	55	8
	60
	62
	72
42	55	8
	60
	62
	72
45	60	8
	62
	65
	72
48	62	8
	65
	72
50	65	8
	68
	72
	80
52	68	8
52	72	8
55	70	8
	72
	80
	85	10
56	70	8
	72
	80
	85	10
58	72	8
58	80	8
60	75	8
	80	8
	85	10
	90	10

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
62	80	8
	85	10
	90	10
63	85	10
63	90	10
65	85	10
	90
	100
68	90	10
68	100	10
70	90	10
70	100	10
72	95	10
72	100	10
75	95	10
75	100	10
78	100	10
80	100	10
80	110	12
85	110	12
85	120	12
90	110	12
90	120	12
95	120	12
95	125	12
100	120	12
	125
	130
105	130	12
105	140	12
110	130	12
110	140	12
115	140	12
115	150	12
120	150	12
120	160	12
125	150	12
125	160	12
130	160	12
130	170	15
135	170	15
140	170	15
145	175	15
150	180	15
160	190	15
170	200	15
180	210	15
190	220	15
200	230	15

Bore and shaft dimensions are based on DIN Standards 3760.
Moontown can manufacture non-standard sizes to fit your existing hardware.
Please consult Moontown for further details.
This table also applies to our metal cased lip seals.
Please see seperate sheet for metal cased PTFE Lip Seal.

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NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
8	22	7
	24
	26
9	22	7
	24
	26
10	22	7
	24
	26
11	22	7
11	26	7
12	22	7
	24
	28
	30
14	24	7
	28
	30
	35
15	26	7
	30
	32
	35
16	28	7
	30
	32
	35
17	28	7
	30
	32
	35
	40
18	30	7
	32
	35
	40
20	30	7
	32
	35
	40
	47
22	32	7
	35
	40
	47
24	35	7
	37
	40
	47
25	35	7
	40
	42
	47
	52
26	37	7
	42
	47

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
28	40	7
	47
	52
30	40	7
	42
	47
	52
	62	8
32	45	7
	47
	52
35	47	7
	50
	52
	62	8
36	47	7
	50
	52
	62	8
38	52	7
	55	8
	62	8
40	52	7
	55	8
	60
	62
	72
42	55	8
	60
	62
	72
45	60	8
	62
	65
	72
48	62	8
	65
	72
50	65	8
	68
	72
	80
52	68	8
52	72	8
55	70	8
	72
	80
	85	10
56	70	8
	72
	80
	85	10
58	72	8
58	80	8
60	75	8
	80	8
	85	10
	90	10

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
62	80	8
	85	10
	90	10
63	85	10
63	90	10
65	85	10
	90
	100
68	90	10
68	100	10
70	90	10
70	100	10
72	95	10
72	100	10
75	95	10
75	100	10
78	100	10
80	100	10
80	110	12
85	110	12
85	120	12
90	110	12
90	120	12
95	120	12
95	125	12
100	120	12
	125
	130
105	130	12
105	140	12
110	130	12
110	140	12
115	140	12
115	150	12
120	150	12
120	160	12
125	150	12
125	160	12
130	160	12
130	170	15
135	170	15
140	170	15
145	175	15
150	180	15
160	190	15
170	200	15
180	210	15
190	220	15
200	230	15

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
8	22	7
	24
	26
9	22	7
	24
	26
10	22	7
	24
	26
11	22	7
11	26	7
12	22	7
	24
	28
	30
14	24	7
	28
	30
	35
15	26	7
	30
	32
	35
16	28	7
	30
	32
	35
17	28	7
	30
	32
	35
	40
18	30	7
	32
	35
	40
20	30	7
	32
	35
	40
	47
22	32	7
	35
	40
	47
24	35	7
	37
	40
	47
25	35	7
	40
	42
	47
	52
26	37	7
	42
	47

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
28	40	7
	47
	52
30	40	7
	42
	47
	52
	62	8
32	45	7
	47
	52
35	47	7
	50
	52
	62	8
36	47	7
	50
	52
	62	8
38	52	7
	55	8
	62	8
40	52	7
	55	8
	60
	62
	72
42	55	8
	60
	62
	72
45	60	8
	62
	65
	72
48	62	8
	65
	72
50	65	8
	68
	72
	80
52	68	8
52	72	8
55	70	8
	72
	80
	85	10
56	70	8
	72
	80
	85	10
58	72	8
58	80	8
60	75	8
	80	8
	85	10
	90	10

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
62	80	8
	85	10
	90	10
63	85	10
63	90	10
65	85	10
	90
	100
68	90	10
68	100	10
70	90	10
70	100	10
72	95	10
72	100	10
75	95	10
75	100	10
78	100	10
80	100	10
80	110	12
85	110	12
85	120	12
90	110	12
90	120	12
95	120	12
95	125	12
100	120	12
	125
	130
105	130	12
105	140	12
110	130	12
110	140	12
115	140	12
115	150	12
120	150	12
120	160	12
125	150	12
125	160	12
130	160	12
130	170	15
135	170	15
140	170	15
145	175	15
150	180	15
160	190	15
170	200	15
180	210	15
190	220	15
200	230	15

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
8	22	7
	24
	26
9	22	7
	24
	26
10	22	7
	24
	26
11	22	7
11	26	7
12	22	7
	24
	28
	30
14	24	7
	28
	30
	35
15	26	7
	30
	32
	35
16	28	7
	30
	32
	35
17	28	7
	30
	32
	35
	40
18	30	7
	32
	35
	40
20	30	7
	32
	35
	40
	47
22	32	7
	35
	40
	47
24	35	7
	37
	40
	47
25	35	7
	40
	42
	47
	52
26	37	7
	42
	47

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
28	40	7
	47
	52
30	40	7
	42
	47
	52
	62	8
32	45	7
	47
	52
35	47	7
	50
	52
	62	8
36	47	7
	50
	52
	62	8
38	52	7
	55	8
	62	8
40	52	7
	55	8
	60
	62
	72
42	55	8
	60
	62
	72
45	60	8
	62
	65
	72
48	62	8
	65
	72
50	65	8
	68
	72
	80
52	68	8
52	72	8
55	70	8
	72
	80
	85	10
56	70	8
	72
	80
	85	10
58	72	8
58	80	8
60	75	8
	80	8
	85	10
	90	10

NOM SHAFT S DIM	NOM BORE B DIM	SEAL WIDTH W DIM
62	80	8
	85	10
	90	10
63	85	10
63	90	10
65	85	10
	90
	100
68	90	10
68	100	10
70	90	10
70	100	10
72	95	10
72	100	10
75	95	10
75	100	10
78	100	10
80	100	10
80	110	12
85	110	12
85	120	12
90	110	12
90	120	12
95	120	12
95	125	12
100	120	12
	125
	130
105	130	12
105	140	12
110	130	12
110	140	12
115	140	12
115	150	12
120	150	12
120	160	12
125	150	12
125	160	12
130	160	12
130	170	15
135	170	15
140	170	15
145	175	15
150	180	15
160	190	15
170	200	15
180	210	15
190	220	15
200	230	15