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Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings.
Std cyl. bore: 3.625" (92.075mm).
1st ring: 2.0mm.
2nd ring: 2.0mm.
oil ring: 4.75mm.

Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order.
Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-5/8" bore chr/moly piston rings. +.030"

#908570

Stock:Yes

Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings.
Std cyl. bore: 3.625" (92.075mm).
1st ring: 2.0mm.
2nd ring: 2.0mm.
oil ring: 4.75mm.

Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order.
Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-5/8" bore chr/moly piston rings. +.040"

#908575

Stock:Yes

3-5/16" piston ring set with 3/32" (.09375") gray iron parkerized compression and 3/16" (.186") chromed 3-piece oil rings. Fits 37-48 74" (1200cc) 'U' model Flatheads and 48-52 61" (1000cc) E, EL Panhead models.
Std bore: 3-5/16" (84.138mm).
1st ring: 2.38mm (3/32").
2nd ring: 2.38mm (3/32").
oil ring: 4.75mm (3/16").

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-5/16" piston rings. STD

#946470

Stock:Yes

Used with late style 1950-1973 type pistons with 1/16" gray iron parkerized compression rings and the 3-piece flex-vent style chrome oil rings. Also fits 52-56 K, KH, KHK 55" (900cc) Flathead models.
Std Bore: 2.745" (69.723mm).
1st ring: 1.6mm.
2nd ring: 1.6mm.
oil ring: 4.75mm.

Note: OEM 1929-1949 pistons are equipped with 3/32" (2.3mm) 1st. & 2nd rings and 1/8" (3.2mm) oil ring, for these Hastings rings see 1950-1973 Flathead model years. These rings will not fit the 1929-1949 early type pistons.
Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 2-3/4" bore piston ring set. +.020"

#946454

Stock:Yes

Replacement for 99-06 Twin Cam models that are equipped with the 95" (1550cc) 3-7/8" OEM big bore kit. Also fits 07-17 Twin Cam 103" (1690cc) engine.
Std cyl. bore: 3.875" (98.425mm).
1st ring: 1.5mm.
2nd ring: 1.5mm.
oil ring: 2.5mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-7/8" chr/moly piston ring set. +.030"

#915354

Stock:Yes

Stock replacement for 99-06 Twin Cam 88™ 1450cc models.
Std cyl. bore: 3.75" (95.25mm).
1st ring: 1.5mm.
2nd ring: 1.5mm.
Oil ring: 3.0mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-3/4" bore chr/moly piston ring set. +.030"

#915345

Stock:Yes

Stock replacement for 99-06 Twin Cam 88™ 1450cc models.
Std cyl. bore: 3.75" (95.25mm).
1st ring: 1.5mm.
2nd ring: 1.5mm.
Oil ring: 3.0mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-3/4" bore chr/moly piston ring set. +.010"

#915343

Stock:Yes

Replacement for 99-06 Twin Cam models that are equipped with the 95" (1550cc) 3-7/8" OEM big bore kit. Also fits 07-17 Twin Cam 103" (1690cc) engine.
Std cyl. bore: 3.875" (98.425mm).
1st ring: 1.5mm.
2nd ring: 1.5mm.
oil ring: 2.5mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-7/8" chr/moly piston ring set. +.020"

#915353

Stock:Yes

Stock replacement for 99-06 Twin Cam 88™ 1450cc models.
Std cyl. bore: 3.75" (95.25mm).
1st ring: 1.5mm.
2nd ring: 1.5mm.
Oil ring: 3.0mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-3/4" bore chr/moly piston ring set. +.020"

#915344

Stock:No

Std cyl. bore: 3.00" (76.20mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3" bore chromoly piston ring set. +.010"

#507795

Stock:Yes

Comes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring.
Std cyl. bore: 2.745" (69.72mm).
1st ring: 2.3mm (3/32).
2nd ring: 2.3mm (3/32').
Oil ring: 3.2mm (1/8").

Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and late style 3/16" (4.75mm) 3-piece flex-vent style oil rings for improved oil control, for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons.
Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 2.745" bore piston ring set. +.040"

#946148

Stock:Yes

Comes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring.
Std cyl. bore: 2.745" (69.72mm).
1st ring: 2.3mm (3/32).
2nd ring: 2.3mm (3/32').
Oil ring: 3.2mm (1/8").

Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and late style 3/16" (4.75mm) 3-piece flex-vent style oil rings for improved oil control, for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons.
Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 2.745" bore piston ring set. STD

#946144

Stock:Yes

Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings.
Std cyl. bore: 3.625" (92.075mm).
1st ring: 2.0mm.
2nd ring: 2.0mm.
oil ring: 4.75mm.

Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order.
Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-5/8" bore chr/moly piston rings. +.010"

#908560

Stock:Yes

Replacement for 99-06 Twin Cam models that are equipped with the 95" (1550cc) 3-7/8" OEM big bore kit. Also fits 07-17 Twin Cam 103" (1690cc) engine.
Std cyl. bore: 3.875" (98.425mm).
1st ring: 1.5mm.
2nd ring: 1.5mm.
oil ring: 2.5mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-7/8" chr/moly piston ring set. +.010"

#915352

Stock:Yes

Stock replacement for 99-06 Twin Cam 88™ 1450cc models.
Std cyl. bore: 3.75" (95.25mm).
1st ring: 1.5mm.
2nd ring: 1.5mm.
Oil ring: 3.0mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-3/4" bore chr/moly piston ring set. +.005"

#915342

Stock:Yes

Std cyl. bore: 3.75" (95.25mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. Oil ring: 2.5mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-3/4" bore chr/moly piston ring set. +.010"

#915362

Stock:Yes

Std cyl. bore: 3.75" (95.25mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. Oil ring: 2.5mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-3/4" bore chr/moly piston ring set. +.005"

#915361

Stock:Yes

3-5/16" piston ring set with 3/32" (.09375") gray iron parkerized compression and 3/16" (.186") chromed 3-piece oil rings. Fits 37-48 74" (1200cc) 'U' model Flatheads and 48-52 61" (1000cc) E, EL Panhead models.
Std bore: 3-5/16" (84.138mm).
1st ring: 2.38mm (3/32").
2nd ring: 2.38mm (3/32").
oil ring: 4.75mm (3/16").

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3-5/16" piston rings. +.030"

#946473

Stock:Yes

Standard cylinder bore: 4.016" (102mm).
1st. ring: 1.2mm.
2nd ring: 1.2mm.
Oil ring: 2.0mm.
Stock replacement for 114" models. Comes with a chrome top ring, a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 114" M8 chrome piston ring set. +.010"

#938827

Stock:Yes

Standard cylinder bore: 3.937" (100mm) bore.
1st. ring: 1.2mm.
2nd ring: 1.2mm
Oil ring: 2.0mm
Stock replacement for 107" models. Comes with a chrome top ring, a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Information provided by Hastings Manufacturing Company, Inc.)

Hastings, 107" M8 chrome piston ring set. STD

#938821

Stock:Yes