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TThe HMU style multi-lip rod u-seal combines the pressure-compensating, uni-directional characteristics of a u-seal with the multi-lip sealing effectiveness of compression-type stacked-packings. Made from premium materials, the HMU utilizes several sealing lip edges for dry rod performance while minimizing friction. The multi-lip design maintains a critical sealing edge even though increasing pressure moves the line of contact down towards the heel. N=BUNA-N, V=FLUOROCARBON NOTE: If Product number ends in 'U' it's constructed of Polyurethane, if sku ends in 'N' or 'V' it's Homogenous. -
The HMU style multi-lip rod u-seal combines the pressure-compensating, uni-directional characteristics of a u-seal with the multi-lip sealing effectiveness of compression-type stacked-packings. Made from premium materials, the HMU utilizes several sealing lip edges for dry rod performance while minimizing friction. The multi-lip design maintains a critical sealing edge even though increasing pressure moves the line of contact down towards the heel. NOTE: If Product number ends in 'U' it's constructed of Polyurethane, if sku ends in 'N' or 'V' it's Homogenous. -
The twin lip design helps solve difficult rod sealing problems by providing lower friction, increased stability, and high dynamic lip force, while preventing air penetration from outside the cylinder. -
Featuring high pressure and high shock load capability, this seal utilizes the same twin lip design found in Hercules Sealing Products' RTU style. With the main body of the seal molded from high performance polyurethane, this seal incorporates a dynamically designed nitrile energizer and a tough polyacetal anti-extrusion ring. RTUB is capable of pressures up to 10,000 psi in approved applications. Please consult Hercules Engineering for pressures above 6,000 psi. MAXIMUM EXTRUSION GAP PRESSURE/MAX. DIAM. GAP: |2,400 PSI/.040| |3,750 PSI/.032| |6,000 PSI/.024| | 7,500 PSI/.016| |10,000 PSI/.010| -
Molded from high performance polyurethane, Style RTUL Rod U-Seals feature an expander for good low pressure sealing. The twin lip feature reduces friction and promotes stability. NOTE: RTUSL has a canted coil energizer. -
Style RU seals are molded from high quality urethane and designed specifically for rod applications. P = HIGH PERFORMANCE MATERIAL UP TO +275° F -
Incorporating a rubber seal lip, a rubberized fabric heel and an acetal back-up ring. This seal provides excellent sealability and high extrusion resistance. -
UKR u-seals are designed to act as a positive sealing, low friction replacement for conventional rubber u-seals. Molded from polyurethane, UKR u-seals provide long life and high resistance against extrusion. Low friction allows these seals to run smoothly in lubricated or non-lucricated cylinder. Available for rod sealing, the flexible dynamic lip provides very low breakaway friction and steady motion. -
Specifically designed as piston seals, these u-seals are engineered to seal on their outside diameter. They offer extended service life and maximum reliability in piston sealing. MAXIMUM EXTRUSION GAP PRESSURE / MAX. DIAM. GAP: | 1,000 PSI/.032 | | 3,000 PSI/.015 | | 5,000 PSI/.012 | | 6,000 PSI/.009 | -
Style PU seals are molded from high quality urethane and designed specifically for piston applications. -
Constructed of a rubber seal lip with a rubberized fabric heel, these seals feature a poly-acetal bearing ring or a poly-acetal anti-extrusion ring. These seals offer excellent sealing ability and high pressure capability. Commonly are used with the SR retention rings. -
UKP u-seals are designed to act as a positive sealing, low friction replacement for conventional rubber u-seals. Molded from polyurethane, UKP u-seals provide long life and high resistance against extrusion. Low friction allows these seals to run smoothly in lubricated or non-lubricated cylinder. Available for bore sealing, the flexible dynamic lip provides very low breakaway friction and steady motion. -
Used as a companion to our 'B' lip configured, Style 850 U-Seal. Style 855 PRC rings convert a uni-directional u-seal into a bi-directional seal. NOTE: Height dimension is the increase in groove width required.- MATERIAL 95A URETHANE
- TEMPERATURE RANGE -40° to +200° F
- PRESSURE RANGE 0 to 5,000 PSI
- SPEED 3 FT/SEC
- PART NUMBER (Prefix)(CS) - (Inside Diameter)
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Style 870 u-seals are precision molded from Buna-N synthetic rubber. Style 870 u-seal numbers conform in size to Army-Navy specification AN6226. -
Used interchangeably for piston or rod sealing, these u-seals employ the same tough urethane material found in our Heavy Duty Rod and Piston U-Seals. -
Style HRU u-seals are precision molded from 80 Durometer Buna-N rubber. Sizes include those found in Army-Navy spec. AN6226 and narrow cross-section sizes found in J.I.C. cylinders and the popularly termed 'Huva Cup'. -
Style HSU u-seals are precision molded from 90 Dureometer Buna-N rubber or 90 A Fluorocarbon (suffix 'V') - 90 Duro Rubber for abrasion resistance and Fluorocarbon for heat resistance. These seals are commonly found in industrial cylinders, as piston, rod and cushion seals. -
Style HU seals feature a reverse bevel lip design and are molded from high quality urethane. The balanced symmetrical design makes them ideal for rod or piston applications. V=FLUOROCARBON -
Style 850 u-seals offer excellent resistance to extrusion and abrasion. The round cross-section expander offers energized sealing from zero to 5,000 psi.FLUOROCARBON = "V"
BFM = 58D DUROMETER FLUOROTREL -65° TO +275° F BHN = 85A DUROMETER HYDROGENATED NITRILE -50° to +320° F BPM = 58D DUROMETER POLYMYTE -65° to +275° F / -65° to +180° F IN WATER BASED FLUIDSSEAL INFORMATION MATERIAL 90A FLUOROCARBON | 95A URETHANE TEMPERATURE RANGE -20° to +400° F | -40° to +200° F PRESSURE RANGE 0 to 2,000 PSI | 0 to 5,000 PSI SPEED 3 FT/SEC PART NUMBER (Prefix)(CS) - (Inside Dia) - (Height) 
Standard - Height and cross section are equal, thus giving a square seal. Utilizes type 'D' lip Typical Part Number P25-02.500 
Deep - Utilizes the same 'D' lip, but the seal height is greater than the cross section, thus giving a retangular shape. Typical Part Number P25-02.500-37D 
Type B - Same dimensions as the Deep seal. Beveled lip design provides better film breaking. Utilizes type 'B' lip. Typical Part Number U25-02.500-37B -
Style 800 U-seals are molded from tough, abrasion-resistant polyurethane. The four lobed expander ring energizes the sealing lips, even at zero pressure, to help prevent 'weeping' when the system is idle.FLUOROCARBON = "V"
SEAL INFORMATION MATERIAL 95A URETHANE | 95A FLUOROCARBON TEMPERATURE RANGE -65° to +220° F | -20° to +400° F PRESSURE RANGE 0 to 5,000 PSI | 0 to 2,000 PSI SPEED 3 FT/SEC PART NUMBER (Prefix)(CS) - (Inside Dia) - (Height) 
Standard - Height and cross section are equal, thus giving a square seal. Utilizes type 'D' lip. Typical Part Number U25-2.50 
Deep - Utilizes the same 'D' lip, but the seal height is greater than the cross section, thus giving a rectangular shape. Typical Part Number U25-2.50-37D 
Type SQB - Same dimensions as the Standard seal. Beveled lip design provides better film breaking. Utilizes type 'B' lip. Typical Part Number U25-2.50-SQB 
Type B - Same dimensions as the Deep seal. Beveled lip design provides better film breaking. Utilizes type 'B' lip. Typical Part Number U25-2.50-37B -
The Z-Seal is a squeeze type seal, combining the excellent sealability and low compression set of a resilient rubber lip with the greater anti-extrusion characteristics of a hard thermoplastic base. Under low pressure conditions, the sealing lip provides its own compressive seal force. As pressure increases, hydrostatic pressure is mechanically transmitted through the elastomeric seal element into the anti-extrusion base. The applied force then deflects radially in a controlled manner, closing the extrusion gap behind the sealing lip. Under this condition, maximum sealing effectiveness is achieved.SEAL INFORMATION MATERIAL 95A URETHANE
70A NITRILE RUBBERTEMPERATURE RANGE -40° to +200° F PRESSURE RANGE 0 to 5,000 PSI SPEED 3 FT/SEC PART NUMBER (Prefix)(CS) - (Inside Dia) - (Height) 
Suffix:
ZF = Fluorotrel (-40° to +235° F)
ZL = Low Temperature Nitrile Sealing Lip
(-65° to +200° F)
ZLF = (-65° to +200° F) -
Incorporating a rubber seal lip and a rubberized fabric heel, this seal provides excellent sealability and high strength.SEAL INFORMATION MATERIAL RUBBER & FABRIC TEMPERATURE RANGE -22° to +212° F PRESSURE RANGE 0 to 2,900 PSI SPEED 1.5 FT/SEC PART NUMBER (Prefix)(CS) - (Inside Dia) - (Height) -
Style UPU Premium U-Seals are molded from ultra tough urethane for severe service conditions. They feature higher tensile strength and modulus for extrusion resistance. These seals are used in high energy services such as rock drills and shock absorbing devices where high internal heat is generated.SEAL INFORMATION MATERIAL 93A URETHANE TEMPERATURE RANGE -65° to +300° F PRESSURE RANGE 0 to 5,000 PSI SPEED 3 FT/SEC PART NUMBER (Prefix)(CS) - (Inside Dia) - (Height) Standard - Height and cross section are equal, thus giving a square seal. Utilizes type 'D' lip. Typical Part Number UPU25-2.50 Deep - Utilizes the same 'D' lip, but the seal height is greater than the cross section, thus giving a rectangular shape. Typical Part Number UPU25-2.50-37D Type SQB - Same dimensions as the Standard seal. Beveled lip design provides better film breaking. Utilizes type 'B' lip. Typical Part Number UPU25-2.50-SQB Type B - Same dimensions as the Deep seal. Beveled lip design provides better film breaking. Utilizes type 'B' lip. Typical Part Number UPU25-2.50-37B -
Caterpillar - 1 Piece Rod Buffer SealSEAL INFORMATION MATERIAL 92A URETHANE TEMPERATURE RANGE -40° TO +200° F PRESSURE RANGE 0 to 5,000 PSI SPEED 3 FT/SEC 12FT/SEC -
BRONZE FILLED PTFE ROD BUFFER SEALSEAL INFORMATION MATERIAL BRONZE FILLED PTFE SEAL
RUBBER ENERGIZERTEMPERATURE RANGE -40° TO +220° F PRESSURE RANGE 0 to 5,000 PSI SPEED 3 FT/SEC 12FT/SEC -
Out of stock
These lip-type buffer seals are designed for replacement in Caterpillar® cylinders. The hinged-lip design reduces friction, heat, and wear under low-pressure conditions and acts as a check valve allowing back-pressure relief. Seals for rod sizes 2-1/8" and under do not have a back-up ring. Caterpillar Specific Buffer Seals - DYR StyleCATERPILLAR DYR SEAL INFORMATION MATERIAL URETHANE TEMPERATURE RANGE -22° TO +230° F PRESSURE RANGE 0 to 6,000 PSI SPEED 3 FT/SEC 12 FT/SEC -
U-cup style buffer ring offers an asymmetric sealing lip profile, chamfered sealing edges, and pressure relieving capabilities to prevent inner pressure entrapment when employed in a tandem sealing system. This rod buffer seal is designed to absorb impact pressure fluctuations under high-load conditions thus increasing the life of the primary seal.SEAL INFORMATION MATERIAL URETHANE U-STYLE, POLYACETAL BACK-UP TEMPERATURE RANGE -40° to +230° F PRESSURE RANGE 0 to 8,000 PSI SPEED 3 FT/SEC PART NUMBER (Prefix)(CS) - (Inside Dia) - (O-Ring CS) / (Prefix)(CS) - (Inside Dia) - (Nom. Seal Height) -
Molded in Bronze Filled PTFE with a rubber energizer, this seal absorbs the shock of pressure spikes to protect the rod seal.SEAL INFORMATION MATERIAL BRONZE FILLED PTFE SEAL RUBBER ENERGIZER TEMPERATURE RANGE -40° to +220° F PRESSURE RANGE 0 to 5,000 PSI SPEED 12 FT/SEC PART NUMBER (Prefix)(CS) - (Inside Dia)(O-Ring CS) -
The RBS style rod buffer seals are a rectangular urethane buffer ring designed to absorb pressure fluctuations thereby protecting the primary rod seal. Some sizes include a radial and axial slot, which faces the pressure, to relieve back pressure between the primary and buffer seal. This simple design is commonly found on older construction equipment.SL=SLOTTED
SEAL INFORMATION MATERIAL 92A URETHANE TEMPERATURE RANGE -40° to +200° F PRESSURE RANGE 0 to 5,000 PSI SPEED 3 FT/SEC PART NUMBER (Prefix) - (ID) X (OD) -
Employed mainly in cylinders made by Cascade Corp., these vee sets are often over-sized or are different from standard vee sets. They are often used with Follower bearings.SEAL INFORMATION MATERIAL FABRIC REINFORCED RUBBER AND URETHANE RINGS/NYLON ADAPTORS TEMPERATURE RANGE -35° to +220° F PRESSURE RANGE 0 to 10,000 PSI SPEED 1.5 FT/SEC PART NUMBER (Prefix) (ID) (CS) X (Height) -
Molded from glass filled nylon, these step-cut bearings also act as retainers for Hydrolock vee sets. The following bore sizes are available.SEAL INFORMATION MATERIAL NYLON TEMPERATURE RANGE -40° to +220° F -
These vee sets utilize hytrel & nylon vees to cover pressure from 0 to 6,000 psi and provide excellent extrusion resistance. Male & female bearings are molded from glass filled nylon. NOTE: These vee sets do not contain guidelock bearings. They are sold seperately (designated by the 'HDLG-' product code prefix). FB = FEMALE BEARING, 1740 = 3 VEES, 1741 = 4 VEES, 1742 = 5 VEESSEAL INFORMATION MATERIAL HYTREL & NYLON TEMPERATURE RANGE -40° to +220° F PRESSURE RANGE 0 to 6,000 PSI SPEED 1.5 FT/SEC PART NUMBER (Prefix) - (# of vees) - (OD) - (Bearing Height)
