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  • Piston and Ring Oversize (mm)
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United Engine & Machine

United Engine and Machine Piston Ring Sets

4.42 out of 5 stars 36 Customer Reviews

United Engine and Machine piston ring sets are made from quality materials. They're available in sizes to seal many different performance engines, will help protect against oil blowby, and feature standard ring end gaps for an easy installation.

Results 1 - 25 of 165

United Engine and Machine Piston Ring Sets 4000BD8.035

Made in the USA United Engine and Machine Piston Ring Sets 4000BD8.035

United Engine and Machine Piston Ring Sets 4000BD8.035

Piston Rings, 4.030 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile, Plasma-moly, File Fit, 8-Cylinder, Set

Part Number: UEM-4000BD8-035

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4000BD8.045

Made in the USA United Engine and Machine Piston Ring Sets 4000BD8.045

United Engine and Machine Piston Ring Sets 4000BD8.045

Piston Rings, 4.040 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile, Plasma-moly, File Fit, 8-Cylinder, Set

Part Number: UEM-4000BD8-045

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4000AM8.030

Made in the USA United Engine and Machine Piston Ring Sets 4000AM8.030

United Engine and Machine Piston Ring Sets 4000AM8.030

Piston Rings, 4.030 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4000AM8-030

4.9 out of 5 stars ( 10 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4250BD8.065

Made in the USA United Engine and Machine Piston Ring Sets 4250BD8.065

United Engine and Machine Piston Ring Sets 4250BD8.065

Piston Rings, 4.310 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile, Plasma-moly, File Fit, 8-Cylinder, Set

Part Number: UEM-4250BD8-065

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4000BM8.040

Made in the USA United Engine and Machine Piston Ring Sets 4000BM8.040

United Engine and Machine Piston Ring Sets 4000BM8.040

Piston Rings, 4.040 in. Bore, 1/16 in., 1/16 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4000BM8-040

Not Yet Reviewed

Estimated Ship Date: Tomorrow if ordered today

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Estimated Ship Date: Tomorrow if ordered today

United Engine and Machine Piston Ring Sets 4000AM8.060

Made in the USA United Engine and Machine Piston Ring Sets 4000AM8.060

United Engine and Machine Piston Ring Sets 4000AM8.060

Piston Rings, 4.060 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4000AM8-060

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4000BM8.030

Made in the USA United Engine and Machine Piston Ring Sets 4000BM8.030

United Engine and Machine Piston Ring Sets 4000BM8.030

Piston Rings, 4.030 in. Bore, 1/16 in., 1/16 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4000BM8-030

4.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4320AM8.030

Made in the USA United Engine and Machine Piston Ring Sets 4320AM8.030

United Engine and Machine Piston Ring Sets 4320AM8.030

Ring Set 4.350 bore, .030 oversize, 2-5/64, 1-3/16, moly ring set, qty 8 cyl set

Part Number: UEM-4320AM8-030

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4125AM8.030

Made in the USA United Engine and Machine Piston Ring Sets 4125AM8.030

United Engine and Machine Piston Ring Sets 4125AM8.030

Piston Rings, 4.155 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4125AM8-030

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4165AM8.060

Made in the USA United Engine and Machine Piston Ring Sets 4165AM8.060

United Engine and Machine Piston Ring Sets 4165AM8.060

Piston Rings, 4.225 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4165AM8-060

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4000AM8.040

Made in the USA United Engine and Machine Piston Ring Sets 4000AM8.040

United Engine and Machine Piston Ring Sets 4000AM8.040

Piston Rings, 4.040 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4000AM8-040

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4000AM8.STD

Made in the USA United Engine and Machine Piston Ring Sets 4000AM8.STD

United Engine and Machine Piston Ring Sets 4000AM8.STD

Piston Rings, 4.000 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4000AM8-STD

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4000AM8.020

Made in the USA United Engine and Machine Piston Ring Sets 4000AM8.020

United Engine and Machine Piston Ring Sets 4000AM8.020

Piston Rings, 4.020 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4000AM8-020

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 4125BM8.020

Made in the USA United Engine and Machine Piston Ring Sets 4125BM8.020

United Engine and Machine Piston Ring Sets 4125BM8.020

Piston Rings, 4.145 in. Bore, 1/16 in., 1/16 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4125BM8-020

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4165BD8.065

Made in the USA United Engine and Machine Piston Ring Sets 4165BD8.065

United Engine and Machine Piston Ring Sets 4165BD8.065

Piston Rings, 4.225 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile, Plasma-moly, File Fit, 8-Cylinder, Set

Part Number: UEM-4165BD8-065

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4000BD8.070

Made in the USA United Engine and Machine Piston Ring Sets 4000BD8.070

United Engine and Machine Piston Ring Sets 4000BD8.070

Piston Rings, 4.070 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile Iron, Plasma-moly, 8-Cylinder, Set

Part Number: UEM-4000BD8-070

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4250AM8.030

Made in the USA United Engine and Machine Piston Ring Sets 4250AM8.030

United Engine and Machine Piston Ring Sets 4250AM8.030

Piston Rings, 4.280 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4250AM8-030

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4342AM8.030

Made in the USA United Engine and Machine Piston Ring Sets 4342AM8.030

United Engine and Machine Piston Ring Sets 4342AM8.030

Piston Rings, 4.372 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4342AM8-030

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4165AM8.STD

Made in the USA United Engine and Machine Piston Ring Sets 4165AM8.STD

United Engine and Machine Piston Ring Sets 4165AM8.STD

Piston Rings, 4.165 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4165AM8-STD

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4000BD8.065

Made in the USA United Engine and Machine Piston Ring Sets 4000BD8.065

United Engine and Machine Piston Ring Sets 4000BD8.065

Piston Rings, 4.060 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile, Plasma-moly, File Fit, 8-Cylinder, Set

Part Number: UEM-4000BD8-065

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4165AM8.040

Made in the USA United Engine and Machine Piston Ring Sets 4165AM8.040

United Engine and Machine Piston Ring Sets 4165AM8.040

Piston Rings, 4.205 in. Bore, 5/64 in., 5/64 in., 3/16 in., Iron, Moly, 8-Cylinder, Set

Part Number: UEM-4165AM8-040

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 3910BD8.030

Made in the USA United Engine and Machine Piston Ring Sets 3910BD8.030

United Engine and Machine Piston Ring Sets 3910BD8.030

Piston Rings, 3.940 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile Iron, Plasma-moly, 8-Cylinder, Set

Part Number: UEM-3910BD8-030

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 4165BD8.045

Made in the USA United Engine and Machine Piston Ring Sets 4165BD8.045

United Engine and Machine Piston Ring Sets 4165BD8.045

Piston Rings, 4.205 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile, Plasma-moly, File Fit, 8-Cylinder, Set

Part Number: UEM-4165BD8-045

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

United Engine and Machine Piston Ring Sets 3736BD8.STD

Made in the USA United Engine and Machine Piston Ring Sets 3736BD8.STD

United Engine and Machine Piston Ring Sets 3736BD8.STD

Piston Rings, 3.736 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile Iron, Plasma-moly, 8-Cylinder, Set

Part Number: UEM-3736BD8-STD

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

United Engine and Machine Piston Ring Sets 3910BD8.040

Made in the USA United Engine and Machine Piston Ring Sets 3910BD8.040

United Engine and Machine Piston Ring Sets 3910BD8.040

Piston Rings, 3.950 in. Bore, 1/16 in., 1/16 in., 3/16 in., Ductile Iron, Plasma-moly, 8-Cylinder, Set

Part Number: UEM-3910BD8-040

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

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