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    PSQ PISTON SEAL ASSEMBLIES

    $45.92 – $149.10

    These piston seals provide bi-directional, low friction sealing with increased stability and superior leakage control. The square cut energizer provides low pressure sealing and eliminates backside leakage. This seal also effectively seals between different fluids on each side of the piston seal, making gas/liquid sealing combinations possible. NOTE: Piston diameter 'I' dimensions are given for pistons without wear rings.

    SEAL INFORMATION
    MATERIAL 40% BRONZE FILLED PTFE SEAL, RUBBER ENERGIZER AND QUADÂź RING
    TEMPERATURE RANGE -40° to +250° F
    PRESSURE RANGE 0 to 5,000 PSI
    SPEED 6 FT/SEC
    PART NUMBER (Piston Seal) - (Size)
    MAXIMUM EXTRUSION GAP
    PRESSURE 1000 PSI 3000 PSI 5000 PSI
    MAX DIAM. GAP
    BORE 1-1/2" - 5"    		 0.024" 0.008" 0.005"
    MAX DIAM. GAP
    BORE 6" - 10"    		 0.030" 0.010" 0.006"
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  • PSU PISTON SEAL ASSEMBLIES

    $5.36 – $44.71

    Our Style PSU piston seal, or uniring, is a laminated one piece double acting seal made of cast polyurethane. The tough outer layer is highly resistant to abrasion and is impregnated with molybdenum disulfide to reduce friction. The softer inner layer acts as a static seal and also energizes the OD to make full contact with the bore. This seal may be used to replace an existing Uniring or other seals of the same dimensions - O-rings, O-rings with back-ups, T-seals, U-seals, etc. NOTE: Piston diameter 'I' dimensions are given for pistons without wear rings.

    SEAL INFORMATION
    MATERIAL 60D & 57A
    URETHANE COMPOSITE
    TEMPERATURE RANGE -65° to +220° F
    PRESSURE RANGE 0 to 5,000 PSI
    SPEED 3 FT/SEC
    PART NUMBER (Prefix) - (OD) x (ID) x (Groove Width)
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  • PU PISTON U-SEALS

    $6.88 – $50.82
    Style PU seals are molded from high quality urethane and designed specifically for piston applications.
    • MATERIAL 90A URETHANE
    • TEMPERATURE RANGE -40° to +225° F
    • PRESSURE RANGE 0 to 5,000 PSI
    • SPEED 3 FT/SEC
    • PART NUMBER (Prefix)(CS) - (ID) - (Height)
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  • QR QUAD RINGS

    $1.47 – $120.20

    QR, BUNA-N QUAD RINGS
    The four-lobed design of these seals provides twice the sealing surface of ordinary o-rings. They can be used in a variety of static and dynamic sealing applications including rotary, reciprocating or oscillating motion.
    NOTE: Last three digits of part number corresponds to standard o-ring dash numbers (568-218 = QR-4218)
    V = FLUOROCARBON

    SEAL INFORMATION
    MATERIAL BUNA-N RUBBER
    TEMPERATURE RANGE -40° TO +240°F
    PRESSURE RANGE VARIES ACCORDING TO DIAMETRAL CLEARANCE
    PART NUMBER (Prefix) - (Dash No.)
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  • RBS ROD BUFFER SEALS

    $6.08 – $30.59
    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)
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  • RSR RETAINER RINGS

    $4.98 – $52.81
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  • RTU ROD U-SEALS

    $8.04 – $57.50
    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.
    • MATERIAL 92A URETHANE
    • TEMPERATURE RANGE -40° to +225° F
    • PRESSURE RANGE 0 to 5,000 PSI
    • SPEED 3 FT/SEC
    • PART NUMBER (Prefix)(CS) - (ID) - (Height)
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  • RTUB ROD U-SEALS

    $19.17 – $108.53
    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.
    • 94 A URETHANE SEAL
    • RUBBER ENERGIZER
    • POLYACETAL ANTI-EXTRUSION RING
    • TEMPERATURE RANGE -50° to +230° F
    • PRESSURE RANGE 0 to 6,000 PSI
    • SPEED 3 FT/SEC
    • PART NUMBER (Prefix)(CS) - (ID) - (Height)
    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|
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  • RTUL ROD U-SEALS

    $16.82 – $46.49
    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.
    • MATERIAL 95A URETHANE
    • TEMPERATURE RANGE -40° to +225°
    • PRESSURE RANGE 0 to 5,000 PSI
    • SPEED 3 FT/SEC
    • PART NUMBER (Prefix)(CS) - (ID) - (Height)
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  • RU ROD U-SEALS

    $8.95 – $35.68
    Style RU seals are molded from high quality urethane and designed specifically for rod applications. P = HIGH PERFORMANCE MATERIAL UP TO +275° F
    • MATERIAL 90A URETHANE
    • TEMPERATURE RANGE -40° to +200° F
    • PRESSURE RANGE 0 to 5,000 PSI
    • SPEED 3 FT/SEC
    • PART NUMBER (Prefix)(CS) - (ID) - (Height)
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  • SFS SPLIT FLANGE SEALS

    $2.99 – $7.91

    SFS SPLIT FLANGE SEALS
    FOR 4-BOLT SPLIT FLANGE CONNECTORS
    Flange seals are a one piece dual durometer urethane static seal. The black outer part is a tough, extrusion resistant 95 Durometer and the yellow inner layer is 57 Durometer that has low compression set and excellent sealing properties. These seals are a direct replacement for o-rings and do not require modification to any split flange groove.

    SEAL INFORMATION
    MATERIAL URETHANE
    TEMPERATURE RANGE -40° TO +200°F
    PRESSURE RANGE 0 TO 3000 PSI
    SPEED STATIC
    PART NUMBER (Prefix) - (Dash No.)
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  • SG WIPER RINGS

    $21.55 – $122.58

    SG - 'Seal Guard' Metallic Rod
    Each Seal Guard Wiper consists of two flexible bronze rings which are held in place by a nitrile cushion ring. The cushion ring absorbs side loads and energizes the wiper to maintain close contact with the rod. Particularly suited for hostile environments, seal guard wipers shave off sand, grift, slag, flux, paint, moisture, chips and slivers. Seal Guard Wipers are long-lasting, self-adjusting, and offer low friction. Seal Guard Wipers can be installed in standard Hercules¼ Sealing Products “ST” or “D” Style grooves by increasing the “F” gland dimension to the “F” Throat Diameter shown.

    SEAL INFORMATION
    MATERIAL 660 BRONZE
    70A NITRILE
    TEMPERATURE RANGE -40° to +240° F
    PART NUMBER (Prefix) - (Size)
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  • SPR PISTON RINGS

    $8.11 – $209.61

    IRON PISTON RINGS
    When using iron piston rings, it is crucial to use the correct groove design for proper performance of the cylinder. Please use the following guidelines when cutting an iron piston ring groove

    GROOVE WIDTH:
    To permit the ring to slide freely into the groove, the groove must be at least 0.001 in. wider than the maximum piston ring width with a tolerance of +0.003 in./-0.000 in.
    GROOVE DEPTH:
    Grooves must be at least 0.015 in. deeper than the maximum radial wall thickness of the piston ring with a tolerance of +0.003 in./-0.000 in. This is to avoid any possibility of the ring bottoming in the groove when the ring is compressed to its working diameter.
    RADIAL CLEARANCE:
    The radial clearance between the cylinder bore and piston should be less than 1/3 of the radial wall thickness of the piston ring to ensure sealing effectiveness.
    SEAL INFORMATION
    MATERIAL IRON
    PART NUMBER (Prefix) - (OD)
    BC = Butt Cut
    H = Hook Joint

    END CLEARANCE
    End clearance on piston rings depends on ring design, material and application. The following end clearances are provided as a standard for hydraulic cylinder applications.

    DIAMETER BUTT & ANGLE CUT END CLEARANCE OVERLAPPING JOINT & STEP CUT CLEARANCE
    .500 - 4.561 .003/.010 .005/.015
    4.562 - 19.97 .005/.015 .010/.020
    19.971 - 30.5 .010/.025 .015/.030
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  • SR RETAINER RINGS

    $3.07 – $7.98

    U-Seal Retainer Ring
    These rings are split for ease of installation and are retained in a groove. Their use is primarily to retain a single acting piston seals. Commonly used with UFN style piston seals.

    SEAL INFORMATION
    MATERIAL ACETAL
    TEMPERATURE RANGE -22 ° TO +212°F
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  • ST WIPER RINGS

    $2.74 – $107.47

    Style ST wiper rings are precision molded from 90A durometer urethane. Flexible enough to easily snap into a groove yet tough enough to handle difficult rod wiping applications. 'V' tagged wipers are constructed of fluorocarbon.

    Product Codes ending in SH are designed with a Slotted Heel. The slots in the heel allow excess hydraulic fluid to bypass the wiper, preventing wiper blowout.

    SEAL INFORMATION
    MATERIAL URETHANE / FLUOROCARBON
    TEMPERATURE RANGE URETHANE: -40° to +200° F
    FLUOROCARBON: -20° to +400° F
    SPEED 3 FT/SEC
    PART NUMBER (Prefix) - (Size) - (Alternative Mat.)
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  • ST-E WIPER RINGS

    $16.77 – $110.54

    Style ST-E is a light to medium duty urethane wiper ring with a square shoulder, similar to our standard ST style wipers but with different dimensions.

    SEAL INFORMATION
    MATERIAL URETHANE
    TEMPERATURE RANGE -31° to +212° F
    SPEED 3 FT/SEC
    PART NUMBER (Prefix) - (Size)
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