Symmetrical seal JST

Description

Single-acting seal consisting of a U-shaped jacket and a V-shaped corrosion-resistant spring. The JST sealing ring features a symmetrical sealing profile, making it suitable for both rod and piston applications. The dynamic lip is optimized to provide a long service life and excellent scraping performance, even in high-viscosity media.

Assembly

Clean the housing and chamfer the lead-in edges, without burrs or sharp edges. Lubricate the mating surfaces. Install the seal carefully to avoid damage to the PTFE jacket and the energizing spring. Verify that the seal is properly seated in the groove before commissioning.Check correct seating before commissioning.

Advantages

Materials

PTFE U-shaped jacket (with suitable fillers depending on the application), for its low friction, wide temperature range and chemical resistance, energized by a corrosion-resistant stainless steel V-shaped spring. Suitable for most fluids, chemicals and high-viscosity or particle-laden media.

Technical data

Part No.	d	D	H
U-5.3311.684 JST	5.33	11.68	4
U-5.8410.663.3 JST	5.84	10.66	3.3
U-6125 JST	6	12	5
U-612.24 JST	6	12.2	4
U-7.712.53 JST	7.7	12.5	3
U-7.9314.284 JST	7.93	14.28	4
U-812.523.35 JST	8	12.52	3.35
U-8206.5 JST	8	20	6.5
U-8207 JST	8	20	7
U-9.5165 JST	9.5	16	5
U-10153.3 JST	10	15	3.3
U-10153.5 JST	10	15	3.5
U-10186 JST	10	18	6
U-10.2153.6 JST	10.2	15	3.6
U-11163 JST	11	16	3
U-1117.36.3 JST	11	17.3	6.3
U-11.7516.753.3 JST	11.75	16.75	3.3
U-12163 JST	12	16	3
U-12163.7 JST	12	16	3.7
U-12163.8 JST	12	16	3.8
U-1216.53.4 JST	12	16.5	3.4
U-12173 JST	12	17	3
U-12173.3 JST	12	17	3.3
U-12225 JST	12	22	5
U-12.1616.993.4 JST	12.16	16.99	3.4
U-12.517.55 JST	12.5	17.5	5
U-12.719.054.3 JST	12.7	19.05	4.3
U-12.719.054.5 JST	12.7	19.05	4.5
U-13237 JST	13	23	7
U-13.8256 JST	13.8	25	6
U-14193.3 JST	14	19	3.3
U-142211 JST	14	22	11
U-14225.5 JST	14	22	5.5
U-14.421.44 JST	14.4	21.4	4
U-15203.5 JST	15	20	3.5
U-15.6525.73.8 JST	15.65	25.7	3.8
U-15.8222.14.45 JST	15.82	22.1	4.45
U-15.8720.633.5 JST	15.87	20.63	3.5
U-16264.5 JST	16	26	4.5
U-16265 JST	16	26	5
U-16266.6 JST	16	26	6.6
U-16267 JST	16	26	7
U-17233.8 JST	17	23	3.8
U-18264 JST	18	26	4
U-18285 JST	18	28	5
U-18.9925.45.08 JST	18.99	25.4	5.08
U-1924.53.5 JST	19	24.5	3.5
U-19.626.34.5 JST	19.6	26.3	4.5
U-19.926.34.5 JST	19.9	26.3	4.5
U-20253.5 JST	20	25	3.5
U-20264.5 JST	20	26	4.5
U-2026.154.8 JST	20	26.15	4.8
U-20307 JST	20	30	7
U-20.725.74.4 JST	20.7	25.7	4.4
U-21.8227.783.9 JST	21.82	27.78	3.9
U-22273.2 JST	22	27	3.2
U-22284 JST	22	28	4
U-22284.5 JST	22	28	4.5
U-22285 JST	22	28	5
U-2228.24.3 JST	22	28.2	4.3
U-22294 JST	22	29	4
U-22294.5 JST	22	29	4.5
U-22296.3 JST	22	29	6.3
U-22307 JST	22	30	7
U-2231.76.65 JST	22	31.7	6.65
U-22.2226.973.3 JST	22.22	26.97	3.3
U-22.2228.575.55 JST	22.22	28.57	5.55
U-22.332.36.6 JST	22.3	32.3	6.6
U-23304.35 JST	23	30	4.35
U-23304.4 JST	23	30	4.4
U-2330.354.3 JST	23	30.35	4.3
U-24304.4 JST	24	30	4.4
U-24304.5 JST	24	30	4.5
U-24346.5 JST	24	34	6.5
U-24.630.54.5 JST	24.6	30.5	4.5
U-24.6314.5 JST	24.6	31	4.5
U-24.6332.394.47 JST	24.63	32.39	4.47
U-24.6332.394.5 JST	24.63	32.39	4.5
U-2531.24.8 JST	25	31.2	4.8
U-25324.25 JST	25	32	4.25
U-25347 JST	25	34	7
U-25356 JST	25	35	6
U-25356.5 JST	25	35	6.5
U-2536.646.5 JST	25	36.64	6.5
U-254021 JST	25	40	21
U-25.434.846.09 JST	25.4	34.84	6.09
U-25.434.926 JST	25.4	34.92	6
U-28374.6 JST	28	37	4.6
U-28.1738.15.84 JST	28.17	38.1	5.84
U-30364 JST	30	36	4
U-30374.3 JST	30	37	4.3
U-30407.5 JST	30	40	7.5
U-304515 JST	30	45	15
U-304810 JST	30	48	10
U-30577 JST	30	57	7
U-30.540.56.6 JST	30.5	40.5	6.6
U-30.9438.663.48 JST	30.94	38.66	3.48
U-31.7416.6 JST	31.7	41	6.6
U-31.7538.14.3 JST	31.75	38.1	4.3
U-32406 JST	32	40	6
U-32426.6 JST	32	42	6.6
U-3242.36.6 JST	32	42.3	6.6
U-33.5404.5 JST	33.5	40	4.5
U-34.546.56 JST	34.5	46.5	6
U-34.7445.4 JST	34.7	44	5.4
U-34.9241.274.3 JST	34.92	41.27	4.3
U-34.9244.456.60/8.30 JST	34.92	44.45	6.60/8.30
U-35403.6 JST	35	40	3.6
U-35455.5 JST	35	45	5.5
U-3545.56 JST	35	45.5	6
U-35478 JST	35	47	8
U-355511 JST	35	55	11
U-35.65423.7 JST	35.65	42	3.7
U-36424.3 JST	36	42	4.3
U-36488 JST	36	48	8
U-365128.75 JST	36	51	28.75
U-37486 JST	37	48	6
U-3847.46.7 JST	38	47.4	6.7
U-38.149.56.5 JST	38.1	49.5	6.5
U-39.6744.453.35 JST	39.67	44.45	3.35
U-4049.47.1 JST	40	49.4	7.1
U-40506 JST	40	50	6
U-40506.6 JST	40	50	6.6
U-40507 JST	40	50	7
U-405510 JST	40	55	10
U-40567 JST	40	56	7
U-40625.5 JST	40	62	5.5
U-41516.6 JST	41	51	6.6
U-41589 JST	41	58	9
U-42506.9 JST	42	50	6.9
U-43.553.56.6 JST	43.5	53.5	6.6
U-44547 JST	44	54	7
U-44.4550.84.3 JST	44.45	50.8	4.3
U-45.6557.1 JST	45.6	55	7.1
U-47587 JST	47	58	7
U-47.7372.2624.5 JST	47.73	72.26	24.5
U-49.567.510 JST	49.5	67.5	10
U-50596.5 JST	50	59	6.5
U-5059.316 JST	50	59.3	16
U-5059.47.1 JST	50	59.4	7.1
U-506013 JST	50	60	13
U-506016 JST	50	60	16
U-50606 JST	50	60	6
U-50607 JST	50	60	7
U-5067.59.5 JST	50	67.5	9.5
U-507034.7 JST	50	70	34.7
U-5161.85.8 JST	51	61.8	5.8
U-52636.5 JST	52	63	6.5
U-54636.5 JST	54	63	6.5
U-54646.5 JST	54	64	6.5
U-55655.5 JST	55	65	5.5
U-55657.1 JST	55	65	7.1
U-57643.8 JST	57	64	3.8
U-5768.67.2 JST	57	68.6	7.2
U-577010 JST	57	70	10
U-60705.5 JST	60	70	5.5
U-60706 JST	60	70	6
U-60706.5 JST	60	70	6.5
U-60729.5 JST	60	72	9.5
U-608034.7 JST	60	80	34.7
U-60.6707.1 JST	60.6	70	7.1
U-61.8891.2426.5 JST	61.88	91.24	26.5
U-63736.7 JST	63	73	6.7
U-63798 JST	63	79	8
U-638345 JST	63	83	45
U-6475.67.2 JST	64	75.6	7.2
U-65756.5 JST	65	75	6.5
U-65757.1 JST	65	75	7.1
U-66723.3 JST	66	72	3.3
U-66766 JST	66	76	6
U-668013 JST	66	80	13
U-6774.86 JST	67	74.8	6
U-678010 JST	67	80	10
U-678012.9 JST	67	80	12.9
U-69817 JST	69	81	7
U-70806.5 JST	70	80	6.5
U-70806.6 JST	70	80	6.6
U-70807 JST	70	80	7
U-709047 JST	70	90	47
U-73816 JST	73	81	6
U-73836 JST	73	83	6
U-73.880.54.5 JST	73.8	80.5	4.5
U-74.896.510 JST	74.8	96.5	10
U-80906 JST	80	90	6
U-809312 JST	80	93	12
U-81.7492.075.2 JST	81.74	92.07	5.2
U-82926.5 JST	82	92	6.5
U-82.15101.616 JST	82.15	101.6	16
U-83904.5 JST	83	90	4.5
U-8493.37 JST	84	93.3	7
U-8511012 JST	85	110	12
U-87.861008.89 JST	87.86	100	8.89
U-89.61006.4 JST	89.6	100	6.4
U-901006.5 JST	90	100	6.5
U-95104.45.2 JST	95	104.4	5.2
U-1001107.4 JST	100	110	7.4
U-1001137.2 JST	100	113	7.2
U-10012047 JST	100	120	47
U-10012211 JST	100	122	11
U-10012510.5 JST	100	125	10.5
U-10012512 JST	100	125	12
U-1011106 JST	101	110	6
U-1071134.8 JST	107	113	4.8
U-1071135.2 JST	107	113	5.2
U-112.71119.054.4 JST	112.71	119.05	4.4
U-117.61278.89 JST	117.6	127	8.89
U-1211274.2 JST	121	127	4.2
U-1211318 JST	121	131	8
U-1251324.3 JST	125	132	4.3
U-127133.354.7 JST	127	133.35	4.7
U-12714012.9 JST	127	140	12.9
U-127142.879.27 JST	127	142.87	9.27
U-1301365.2 JST	130	136	5.2
U-1301375.2 JST	130	137	5.2
U-134.81415 JST	134.8	141	5
U-1351415 JST	135	141	5
U-1381507 JST	138	150	7
U-1381526.2 JST	138	152	6.2
U-1401474 JST	140	147	4
U-1401484 JST	140	148	4
U-1411506 JST	141	150	6
U-1441504 JST	144	150	4
U-1451514.5 JST	145	151	4.5
U-1451515 JST	145	151	5
U-1451515.2 JST	145	151	5.2
U-1451515.5 JST	145	151	5.5
U-1451546.6 JST	145	154	6.6
U-1461567 JST	146	156	7
U-1471578.5 JST	147	157	8.5
U-1501706/7.50 JST	150	170	6/7.50
U-1521616.5 JST	152	161	6.5
U-152.4168.279.27 JST	152.4	168.27	9.27
U-155161.44.8 JST	155	161.4	4.8
U-15819019.5 JST	158	190	19.5
U-158.65165.24.8 JST	158.65	165.2	4.8
U-158.75190.519.05 JST	158.75	190.5	19.05
U-1651715 JST	165	171	5
U-1651715.2 JST	165	171	5.2
U-1651746.6 JST	165	174	6.6
U-17019012 JST	170	190	12
U-1721784.3 JST	172	178	4.3
U-177.8193.679.27 JST	177.8	193.67	9.27
U-177.8193.679.39 JST	177.8	193.67	9.39
U-183.9190.34.7 JST	183.9	190.3	4.7
U-1881986.2 JST	188	198	6.2
U-190.5203.28.99 JST	190.5	203.2	8.99
U-203.2215.98.99 JST	203.2	215.9	8.99
U-215.9231.779.27 JST	215.9	231.77	9.27
U-228.6241.311.09 JST	228.6	241.3	11.09
U-228.6241.39.52 JST	228.6	241.3	9.52
U-23524910.5 JST	235	249	10.5
U-241.3257.179.27 JST	241.3	257.17	9.27
U-254266.78.99 JST	254	266.7	8.99
U-266.7282.579.27 JST	266.7	282.57	9.27
U-266.7282.579.39 JST	266.7	282.57	9.39
U-2802969.5 JST	280	296	9.5
U-298.45314.329.27 JST	298.45	314.32	9.27
U-3003206/7.50 JST	300	320	6/7.50
U-304.8317.58.99 JST	304.8	317.5	8.99
U-304.8336.5511.09 JST	304.8	336.55	11.09
U-310322.29.5 JST	310	322.2	9.5
U-330.2346.079.27 JST	330.2	346.07	9.27
U-330.2346.079.39 JST	330.2	346.07	9.39
U-330.2361.9511.1 JST	330.2	361.95	11.1
U-3403527.5 JST	340	352	7.5
U-343.02352.426.6 JST	343.02	352.42	6.6
U-350362.29.5 JST	350	362.2	9.5
U-36938212 JST	369	382	12
U-400.05431.811.1 JST	400.05	431.8	11.1
U-400.05431.811.17 JST	400.05	431.8	11.17
U-49250615.1 JST	492	506	15.1

Technical drawing and installation parameters of the JST symmetrical seals

This technical drawing defines the dimensions and geometric variables required for the correct selection and snap-on installation of the JST symmetrical seal, with a PTFE body energized by a stainless steel spring and suitable for both rod and piston. It shows the critical dimensions linked to the specification tables, such as the inside diameter (Ød), the outside diameter (ØD) and the profile height (H), together with the housing groove width (B), the groove root fillet radii and the 20° lead-in angle. Working to these dimensions ensures accurate positioning, installation without distorting the profile and optimum static and dynamic sealing performance in double-acting applications at medium and high pressures.

Three-dimensional view and components of the JST symmetrical seals

This 3D illustration shows the basic structure of the JST symmetrical seal in detail. You can clearly see its two key elements: the PTFE body with symmetrical sealing lips and the stainless steel spring housed inside it, which provides the permanent radial load and keeps the lips in contact even at low pressure. Its compact design and reversible geometry allow it to be used either as a rod seal or as a piston seal, providing effective sealing, very low friction and simple snap-on installation.

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