Rod seal HR

Description

The HR is a double-acting rotary and oscillating (pivoting) seal, made up of a profile ring (in PTFE or polyurethane) and an elastomer O-Ring that energizes it as a preloading element. This design offers low friction free of stick-slip, high resistance to wear and extrusion and good dynamic and static sealing with long service life. It is ideal for rotary joints, hydraulic distributors, rotary transmissions and mobile machinery joints.

Assembly

Clean the housing and chamfer or round the lead-in edges, without burrs or sharp edges. Lubricate the seal and the surfaces. Fit the O-Ring first and then the profile ring, without damaging or twisting it. Keep the recommended surface roughness and check correct seating before commissioning

Advantages

Materials

The profile ring is made of PTFE (with glass and MoS2 fillers to reduce friction and wear) or polyurethane (PU), energized by an NBR or FKM O-Ring of 70 Shore A depending on the fluid and temperature. Available combinations: PTFE + NBR, polyurethane + NBR, PTFE + FKM and polyurethane + FKM. NBR suits mineral hydraulic oils up to +100 °C, while FKM offers higher chemical and thermal resistance up to +150 °C.

Technical data

NO.	Ød	ØD	B	C	R1
U-1216.92.2 HR	12	16.9	2.2	2	0.4
U-1519.92.2 HR	15	19.9	2.2	2	0.4
U-2027.53.2 HR	20	27.5	3.2	2.5	0.6
U-2532.53.2 HR	25	32.5	3.2	2.5	0.6
U-2832.92.2 HR	28	32.9	2.2	2	0.4
U-3037.53.2 HR	30	37.5	3.2	2.5	0.6
U-3542.53.2 HR	35	42.5	3.2	2.5	0.6
U-37.5453.2 HR	37.5	45	3.2	2.5	0.6
U-40514.2 HR	40	51	4.2	3.5	0.8
U-45564.2 HR	45	56	4.2	3.5	0.8
U-50614.2 HR	50	61	4.2	3.5	0.8
U-55664.2 HR	55	66	4.2	3.5	0.8
U-60714.2 HR	60	71	4.2	3.5	0.8
U-65764.2 HR	65	76	4.2	3.5	0.8
U-70814.2 HR	70	81	4.2	3.5	0.8
U-75864.2 HR	75	86	4.2	3.5	0.8
U-80914.2 HR	80	91	4.2	3.5	0.8
U-85964.2 HR	85	96	4.2	3.5	0.8
U-901014.2 HR	90	101	4.2	3.5	0.8
U-951064.2 HR	95	106	4.2	3.5	0.8
U-1001114.2 HR	100	111	4.2	3.5	0.8
U-1051164.2 HR	105	116	4.2	3.5	0.8
U-1101214.2 HR	110	121	4.2	3.5	0.8
U-1151264.2 HR	115	126	4.2	3.5	0.8
U-1201314.2 HR	120	131	4.2	3.5	0.8
U-1251364.2 HR	125	136	4.2	3.5	0.8
U-1301414.2 HR	130	141	4.2	3.5	0.8
U-1401514.2 HR	140	151	4.2	3.5	0.8
U-1451564.2 HR	145	156	4.2	3.5	0.8
U-1501614.2 HR	150	161	4.2	3.5	0.8
U-1551664.2 HR	155	166	4.2	3.5	0.8
U-1601714.2 HR	160	171	4.2	3.5	0.8
U-1701814.2 HR	170	181	4.2	3.5	0.8
U-1801914.2 HR	180	191	4.2	3.5	0.8
U-1902014.2 HR	190	201	4.2	3.5	0.8
U-200215.56.3 HR	200	215.5	6.3	5	1.2
U-210225.56.3 HR	210	225.5	6.3	5	1.2
U-220235.56.3 HR	220	235.5	6.3	5	1.2
U-240255.56.3 HR	240	255.5	6.3	5	1.2
U-250265.56.3 HR	250	265.5	6.3	5	1.2
U-2803018.1 HR	280	301	8.1	6.5	1.6
U-3003218.1 HR	300	321	8.1	6.5	1.6

Technical drawing and installation parameters of the HR rod seals

This technical drawing defines the essential dimensions and geometric variables for the correct housing and installation of the HR rotary seal. It specifies the critical dimensions linked to the data tables, including the groove width (B), the radial section height (S), the rod diameter (Ød) and the housing bore diameter (ØD). It also details the groove edge radius (r1) and the length (C) and 20° angle of the lead-in chamfer, which must be rounded and free of burrs. These values ensure the correct housing of the profile ring together with the energizing O-Ring, maintain the required preload on the contact surface and prevent damage to the profile during assembly.

Three-dimensional view and components of the HR rod seals

This 3D illustration details the basic structure of the HR double-acting rotary and oscillating seal. The drawing clearly shows its two elements: the profile ring, made of filled PTFE or polyurethane, and the energizing O-Ring in NBR or FKM, which preloads it against the contact surface. This configuration keeps the sealing contact constant, offers low friction and stick-slip free operation, and provides high resistance to wear and extrusion in rotary and pivoting movements.

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