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.
| DIAMETER | BUTT & 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 Number | B 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 |