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HERCULES SPR PISTON SEAL

    SPR Piston Ring

    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” wider than the maximum piston ring width with a tolerance of +0.003”/-0.000”.
    GROOVE DEPTH: Grooves must be at least 0.015” deeper than the maximum radial wall thickness of the piston ring with a tolerance of +0.003”/-0.000”. 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.

    DIAMETERBUTT & ANGLE
    CUT END
    CLEARANCE
    OVERLAPPING JOINT
    & STEP CUT
    END CLEARANCE
    .500-4.561.003/.010.005/.015
    4.562-19.970.005/.015.010/.020
    19.971-30.500.010/.025.015/.030
    Part NumberB
    Nom. OD
    C
    Nom. Ht
    SPR-1001
    SPR-1000
    SPR-1375-H
    SPR-1501
    SPR-1500
    SPR-1530
    SPR-1751
    SPR-1750
    SPR-1875
    SPR-2003
    SPR-2000
    SPR-2006
    SPR-2001
    SPR-2002
    SPR-2030
    SPR-2126
    SPR-2125
    SPR-2251
    SPR-2250
    SPR-2255
    SPR-2254
    SPR-2376
    SPR-2500
    SPR-2503
    SPR-2501
    SPR-2504
    SPR-2502
    SPR-2530
    SPR-2625
    SPR-2752
    SPR-2750
    SPR-2754
    SPR-2756
    SPR-2755
    SPR-2875
    SPR-3000
    SPR-3002
    SPR-3001
    SPR-3003
    SPR-3120
    SPR-3251
    SPR-3256
    SPR-3253
    SPR-3250
    SPR-3255
    SPR-3252
    SPR-3260
    SPR-3280
    SPR-3375
    SPR-3497
    SPR-3500
    SPR-3505
    SPR-3506
    SPR-3502
    SPR-3503
    SPR-3520-BC
    SPR-3625
    SPR-3626
    SPR-3750
    SPR-3752
    SPR-3751
    SPR-3875
    SPR-3990
    SPR-4002
    SPR-4007
    SPR-4000
    SPR-4003
    SPR-4020
    SPR-4030
    SPR-4250
    SPR-4251
    SPR-4252-BC
    SPR-4260
    SPR-4496
    SPR-4501
    SPR-4502
    SPR-4504
    SPR-4506-BC
    SPR-4500
    SPR-4503
    SPR-4520-BC
    SPR-4540
    SPR-4751
    SPR-4752
    SPR-4876-BC
    SPR-5005
    SPR-5001
    SPR-5000
    SPR-5002
    SPR-5008
    SPR-5004
    SPR-5003
    SPR-5030
    SPR-5120
    SPR-5121
    SPR-5251
    SPR-5252
    SPR-5260
    SPR-5496
    SPR-5501
    SPR-5502
    SPR-5506
    SPR-5500
    SPR-5503
    SPR-5520-BC
    SPR-5540
    SPR-5750
    SPR-5751
    SPR-5752
    SPR-6001
    SPR-6006
    SPR-6000
    SPR-6002
    SPR-6004
    SPR-6005
    SPR-6030
    SPR-6040
    SPR-6120
    SPR-6250
    SPR-6252
    SPR-6251
    SPR-6260
    SPR-6496
    SPR-6501
    SPR-6503
    SPR-6502
    SPR-6500
    SPR-6505
    SPR-6520-BC
    SPR-6750
    SPR-6752
    SPR-6751
    SPR-7004
    SPR-7000
    SPR-7002
    SPR-7005
    SPR-7003
    SPR-7006
    SPR-7030
    SPR-7125
    SPR-7250
    SPR-7255
    SPR-7260
    SPR-7375
    SPR-7496
    SPR-7501
    SPR-7500
    SPR-7505
    SPR-7520-BC
    SPR-7750
    SPR-8000
    SPR-8005
    SPR-8006
    SPR-8001
    SPR-8030
    SPR-8125
    SPR-8250
    SPR-8370
    SPR-8420
    SPR-8496
    SPR-8500
    SPR-8503
    SPR-8502
    SPR-8520-BC
    SPR-8751
    SPR-9001
    SPR-9000
    SPR-9004
    SPR-9005
    SPR-9170
    SPR-9250
    SPR-9251
    SPR-9501
    SPR-9500
    SPR-9502
    SPR-9746
    SPR-9885
    SPR-10000
    SPR-10001
    SPR-10030
    SPR-10503
    SPR-10501
    SPR-10502
    SPR-11000
    SPR-11001
    SPR-12001
    SPR-12030
    1
    1
    1-3/8
    1-1/2
    1-1/2
    1.53
    1-3/4
    1-3/4
    1-7/8
    2
    2
    2
    2
    2
    2.03
    2-1/8
    2-1/8
    2-1/4
    2-1/4
    2-1/4
    2-1/4
    2-3/8
    2-1/2
    2-1/2
    2-1/2
    2-1/2
    2-1/2
    2.53
    2-5/8
    2-3/4
    2-3/4
    2-3/4
    2-3/4
    2.755
    2-7/8
    3
    3
    3
    3
    3-1/8
    3-1/4
    3-1/4
    3-1/4
    3-1/4
    3-1/4
    3-1/4
    3.26
    3.28
    3-3/8
    3.497
    3-1/2
    3-1/2
    3-1/2
    3-1/2
    3-1/2
    3.52
    3-5/8
    3-5/8
    3-3/4
    3-3/4
    3-3/4
    3-7/8
    3.99
    4
    4
    4
    4
    4.02
    4.03
    4-1/4
    4-1/4
    4-1/4
    4.26
    4.496
    4-1/2
    4-1/2
    4-1/2
    4-1/2
    4-1/2
    4-1/2
    4.52
    4.54
    4-3/4
    4-3/4
    4-7/8
    5
    5
    5
    5
    5
    5
    5
    5.03
    5-1/8
    5-1/8
    5-1/4
    5-1/4
    5.26
    5.496
    5-1/2
    5-1/2
    5-1/2
    5-1/2
    5-1/2
    5.52
    5.54
    5-3/4
    5-3/4
    5-3/4
    6
    6
    6
    6
    6
    6
    6.03
    6.04
    6-1/8
    6-1/4
    6-1/4
    6-1/4
    6.26
    6.496
    6-1/2
    6-1/2
    6-1/2
    6-1/2
    6-1/2
    6.52
    6-3/4
    6-3/4
    6-3/4
    7
    7
    7
    7
    7
    7
    7.03
    7-1/8
    7-1/4
    7-1/4
    7.26
    7-3/8
    7.496
    7-1/2
    7-1/2
    7-1/2
    7.52
    7-3/4
    8
    8
    8
    8
    8.03
    8-1/8
    8-1/4
    8-3/8
    8.42
    8.496
    8-1/2
    8-1/2
    8-1/2
    8.52
    8-3/4
    9
    9
    9
    9
    9.17
    9-1/4
    9-1/4
    9-1/2
    9-1/2
    9-1/2
    9.746
    9.885
    10
    10
    10.03
    10-1/2
    10-1/2
    10-1/2
    11
    11
    12
    12.03
    3/32
    1/8
    .0975
    3/32
    1/8
    1/8
    3/32
    1/8
    1/8
    3/32
    1/8
    1/8
    3/16
    1/4
    1/8
    1/8
    3/16
    1/8
    3/16
    3/16
    1/4
    3/16
    1/8
    1/8
    3/16
    3/16
    1/4
    1/8
    3/16
    5/32
    3/16
    3/16
    3/16
    .119
    3/16
    3/16
    3/16
    1/4
    5/16
    3/16
    1/8
    1/8
    5/32
    3/16
    3/16
    1/4
    1/4
    3/16
    3/16
    3/16
    1/8
    3/16
    3/16
    1/4
    3/8
    3/16
    1/4
    1/4
    3/16
    3/16
    1/4
    1/4
    1/4
    3/16
    3/16
    1/4
    5/16
    5/16
    1/4
    1/4
    1/4
    1/4
    1/4
    1/4
    3/16
    1/4
    1/4
    1/4
    5/16
    3/8
    3/16
    3/16
    1/4
    1/4
    3/8
    1/8
    3/16
    1/4
    1/4
    1/4
    5/16
    3/8
    1/4
    1/4
    1/4
    1/4
    9/32
    1/4
    1/4
    3/16
    1/4
    1/4
    5/16
    3/8
    3/16
    3/16
    3/16
    1/4
    5/16
    1/8
    3/16
    1/4
    1/4
    5/16
    3/8
    1/4
    3/16
    1/4
    3/16
    1/4
    5/16
    1/4
    1/4
    3/16
    3/16
    1/4
    5/16
    1/2
    3/16
    1/4
    1/4
    5/16
    .24
    1/4
    1/4
    5/16
    3/8
    1/2
    5/16
    1/4
    1/4
    5/16
    1/4
    3/8
    1/4
    1/4
    5/16
    5/16
    3/16
    5/16
    5/16
    5/16
    3/8
    .435
    5/16
    .435
    3/8
    1/4
    1/4
    1/4
    5/16
    5/16
    3/8
    3/16
    3/8
    5/16
    3/8
    .435
    1/2
    5/16
    1/4
    5/16
    1/4
    5/16
    3/8
    1/4
    1/4
    5/16
    3/8
    5/16
    1/4
    3/8
    5/8
    .474
    1/2
    7/16
    3/8