Mechanical Seal John Crane Type 57B

• Customization: Available
• Structure: Single End
• Pressure: Medium Pressure Mechanical Seals
• Model NO.: SS57B
• Speed: General Speed Mechanical Seal
• Temperature: Temperature Mechanical Seal
• Performance: Temperature
• Standard: Standard
• Type: HU1
• Balance: Balanced
• Transport Package: Wooden Box or Carton Box Upon The Order
• Specification: CE; RoHS
• Trademark: Saisi Seal
• Origin: China
• HS Code: 84842000
• Production Capacity: 50, 000sets/Year

Product Description

Structure Description:
Equivalent to Johncrane 57B
Multiple spring design, balanced seal
Operating Limits:
Temperature: -20---180º C
Speed: 15m/s
Pressure: 25bar
Standard Size: 14-100mm
Material:
Seal ring: Car, Sic, Ssic, Ceramic, TC
Secondary seal: NBR, Viton, EPDM etc.
Spring and metal parts: 304, 316, HAST. C

SS58B are hydraulically balanced, multi-spring DIN 24960/EN 12756 seals. They are versatile designs using components common to other o-ring and wedge type seals. They allow easy repair, reduce inventory, and permit a simple conversion to unbalanced or wedge seals.



For use in general and high pressure sealing duties, including chemical processing, refinery and petrochemical plants.
Complies with International Standard ISO 3069, European Standards EN 12756, DIN 24960, and BS
5257: 1975. Also comply with API 610 specifications.

SS57B
Size/Mettic	d1	d	D3	D6	D7	L3	L4	L8	L65
14	14	18	32	21	25	30.5	12.0	18.5	6.0
16	16	20	34	23	27	30.5	12.0	18.5	6.0
18	18	22	36	23	33	31.5	13.5	20.5	6.5
20	20	24	38	29	35	31.5	13.5	20.5	6.5
22	22	26	40	31	37	31.5	13.5	20.5	6.5
24	24	28	42	33	39	34.2	13.3	20.3	6.7
25	25	30	44	34	40	34.5	13.0	20.0	7.0
28	28	33	47	37	43	37.5	12.5	19.5	7.5
30	30	35	49	39	45	38.0	12.0	19.0	8.0
32	32	38	54	42	48	38.0	12.0	19.0	8.0
33	33	38	54	42	48	38.0	12.0	19.0	8.0
35	35	40	56	44	50	38.0	12.0	19.0	8.0
38	38	43	59	49	56	39.5	13.0	20.0	10.0
40	40	45	61	51	58	39.5	13.0	20.0	10.0
43	43	48	64	54	61	39.5	13.0	20.0	10.0
45	45	50	66	56	63	39.5	13.0	20.0	10.0
48	48	53	69	59	66	39.5	13.0	20.0	10.0
50	50	55	71	62	70	44.0	13.5	20.5	11.5
53	53	58	78	65	73	44.0	13.5	20.5	11.5
55	55	60	80	67	75	44.0	13.5	20.5	11.5
58	58	63	83	70	78	49.0	13.5	20.5	11.5
60	60	65	85	72	80	49.0	13.5	20.5	11.5
63	63	68	88	75	83	49.0	13.5	20.5	11.5
65	65	70	90	77	85	49.0	13.5	20.5	11.5
70	70	75	95	83	92	55.0	14.5	21.5	13.5
75	75	80	104	88	97	55.0	14.5	21.5	13.5
80	80	85	109	95	105	55.0	15.0	22.0	13.0
85	85	90	114	100	110	60.0	15.0	22.0	13.0
90	90	95	119	105	115	60.0	15.0	22.0	13.0
95	95	100	124	110	120	60.0	15.0	22.0	13.0
100	100	105	129	115	125	60.0	15.0	22.0	13.0