Mechanical Seal TB21/21T replace John Crane type 21 seal, Roten 21A seal
Mechanical Seal TB21/21T replace John Crane type 21 seal, Roten 21A seal
Mechanical Seal TB21/21T replace John Crane type 21 seal, Roten 21A seal
Mechanical Seal TB21/21T replace John Crane type 21 seal, Roten 21A seal
Mechanical Seal TB21/21T replace John Crane type 21 seal, Roten 21A seal

Mechanical Seal TB21/21T replace John Crane type 21 seal, Roten 21A seal

Model
TB21/21T

Item specifics

Temperature
-20℃-120℃
Speed
≦15m/s
Pressure
≦1.0MPA
Stationary Seat
TBT11
Rotary Ring Material
CAR/SIC/TC
Stationary Ring Material
CER/SIC/TC
O-Ring Material
VIT/NBR/EPDM
Spring & Metal Parts
SUS304/SUS316
Application
Clean Water，Sewage Water，Oil

Review

Description

Product Introduction 
Product Size
Product Details
Product Model
TB21/21T mechanical seal
Replacement to:
John Crane 21, Flowserve 110,Sealol 43CU short, LIDERING LRB01, Hermetica M112K.5SP, Burgmann MG921 / D1-G55, AESSEL P04T, AESSEL P04, Vulcan 11, US SEAL C, Roten 21A, 
Operational Conditions:
Temperature: -20℃ to +120℃
Pressure: ≤1.0MPa
Speed: ≤15m/s

Materials:
Stationary Ring: Silicon Carbide, TC, Carbon
Rotary Ring: Silicon Carbide, Ceramic, TC
Secondary Seal: NBR, EPDM, Viton
Spring and Metal Parts: SUS304,SUS316 
Applications:
Clean water,
sewage water
oil and other moderately corrosive fluids
Stationary Seat:
Standard: TBT11
Alternative:
Product details
SIZE
Size/
Inch
d
D3
D31
D1
L1
L2
0.500
12.7
24.0
22.80
25.40
20.62
7.95
0.625
15.8
26.7
26.70
31.75
22.23
10.31
0.750
19.1
31.2
30.40
34.93
22.23
10.31
0.875
22.2
33.5
33.40
38.10
23.80
10.31
1.000
25.4
43.2
39.30
41.28
25.40
11.10
1.125
28.6
46.5
42.00
44.45
26.97
11.10
1.250
31.7
49.5
45.80
47.63
26.97
11.10
1.375
34.9
52.7
49.30
50.80
28.58
11.10
1.500
38.1
56.0
52.80
53.98
28.58
11.10
1.625
41.2
62.2
55.50
60.33
34.93
12.70
1.750
44.4
66.0
61.00
63.50
34.93
12.70
1.875
47.6
66.0
64.00
66.68
38.10
12.70
2.000
50.8
73.0
66.00
69.85
38.10
12.70
2.125
53.9
73.5
71.50
76.20
42.85
14.27
2.250
57.1
79.6
79.60
79.38
42.85
14.27
2.375
60.3
82.0
79.60
82.55
46.05
14.27
2.500
63.5
85.0
81.50
85.73
46.05
14.27
2.625
66.6
88.5
84.60
85.73
49.20
15.88
2.750
69.8
92.7
90.00
88.90
49.20
15.88
3.000
76.2
102.0
96.80
98.40
52.37
15.88

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