Hastings 3.875" Bore Piston Ring Set +.005" (2M4941005)
- Includes top compression rings, second compression rings, and oil control rings.
- Helps in the the heat transfer process between the piston and cylinder wall.
- Controls combustion chamber gases allowing the piston to transfer the energy of the expanding combustion gases, to the crankshaft.
- Reverse twist ring along with a taper-machined ring face duplicates the OD bottom side scraping edge of a positive twist torsional ring.
- Promotes side sealing that prevents oil from being forced under and behind the ring resulting in better oil economy.
- Three-piece design allows rails to be manufactured with a small cross sectional area for better conformability to bore.
- Provides uniform pressure through four steel rails and two expanders assuring positive oil control.
- Made in the USA.
- Includes enough rings for two pistons (unless noted).
- Two rings per groove, except for the rails that will be two rail rings per one expander ring.
Top Compression Rings are Barrel Face.
Second Compression Ring are Napier.
Oil Control Rings are Three Piece Flex Vent.
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2011-2013 | Harley-Davidson | Blackline FXS | |
| 2017 | Harley-Davidson | Breakout CVO Pro Street FXSE | |
| 2013-2017 | Harley-Davidson | Breakout FXSB | |
| 2008-2011 | Harley-Davidson | Cross Bones FLSTSB | |
| 1999-2000 | Harley-Davidson | Dyna Convertible FXDS-Conv | |
| 2008-2017 | Harley-Davidson | Dyna Fat Bob FXDF | |
| 2004-2006 | Harley-Davidson | Dyna Low Rider EFI FXDLI | |
| 1999-2005 | Harley-Davidson | Dyna Low Rider FXDL | |
| 2007-2009 | Harley-Davidson | Dyna Low Rider FXDL | |
| 2015-2017 | Harley-Davidson | Dyna Low Rider FXDL | |
| 2017 | Harley-Davidson | Dyna Low Rider FXDLS | |
| 2006 | Harley-Davidson | Dyna Street Bob EFI FXDBI | |
| 2007-2017 | Harley-Davidson | Dyna Street Bob FXDB | |
| 2006 | Harley-Davidson | Dyna Super Glide 35th Anniversary FXD | |
| 2005-2006 | Harley-Davidson | Dyna Super Glide Custom EFI FXDCI | |
| 2005 | Harley-Davidson | Dyna Super Glide Custom FXDC | |
| 2007-2014 | Harley-Davidson | Dyna Super Glide Custom FXDC | |
| 2004-2006 | Harley-Davidson | Dyna Super Glide EFI FXDI | |
| 1999-2005 | Harley-Davidson | Dyna Super Glide FXD | |
| 2007-2010 | Harley-Davidson | Dyna Super Glide FXD | |
| 2007 | Harley-Davidson | Dyna Super Glide Screamin Eagle FXDSE | |
| 2004-2005 | Harley-Davidson | Dyna Super Glide Sport EFI FXDXI | |
| 1999-2005 | Harley-Davidson | Dyna Super Glide Sport FXDX | |
| 2001-2003 | Harley-Davidson | Dyna Super Glide T-Sport FXDX-T | |
| 2012-2016 | Harley-Davidson | Dyna Switchback FLD | |
| 2004-2006 | Harley-Davidson | Dyna Wide Glide EFI FXDWGI | |
| 1999-2005 | Harley-Davidson | Dyna Wide Glide FXDWG | |
| 2007-2008 | Harley-Davidson | Dyna Wide Glide FXDWG | |
| 2010-2017 | Harley-Davidson | Dyna Wide Glide FXDWG | |
| 2001 | Harley-Davidson | Dyna Wide Glide Screamin Eagle FXDWG2 | |
| 2002 | Harley-Davidson | Dyna Wide Glide Screamin Eagle FXDWG3 | |
| 1999-2006 | Harley-Davidson | Electra Glide Classic EFI FLHTCI | |
| 1999-2005 | Harley-Davidson | Electra Glide Classic FLHTC | |
| 2007-2013 | Harley-Davidson | Electra Glide Classic FLHTC | |
| 2004-2005 | Harley-Davidson | Electra Glide Classic Screamin Eagle FLHTCSE | |
| 2003-2006 | Harley-Davidson | Electra Glide EFI FLHTI | |
| 1999-2009 | Harley-Davidson | Electra Glide FLHT | |
| 2015-2016 | Harley-Davidson | Electra Glide Low Ultra Classic FLHTCUL | |
| 2015 | Harley-Davidson | Electra Glide Low Ultra Limited FLHTKL | |
| 1999-2006 | Harley-Davidson | Electra Glide Ultra Classic EFI FLHTCUI | |
| 2007-2016 | Harley-Davidson | Electra Glide Ultra Classic FLHTCU | |
| 2006-2007 | Harley-Davidson | Electra Glide Ultra Classic Screamin Eagle FLHTCUS | |
| 2010-2015 | Harley-Davidson | Electra Glide Ultra Limited FLHTK | |
| 2001-2006 | Harley-Davidson | Fat Boy EFI FLSTFI | |
| 1999-2017 | Harley-Davidson | Fat Boy FLSTF | |
| 2010-2016 | Harley-Davidson | Fat Boy Lo FLSTFB | |
| 2017 | Harley-Davidson | Fat Boy Lo S FLSTFBS | |
| 2005-2006 | Harley-Davidson | Fat Boy Screamin Eagle FLSTFSE | |
| 2001-2006 | Harley-Davidson | Heritage Softail Classic EFI FLSTCI | |
| 1999-2017 | Harley-Davidson | Heritage Softail Classic FLSTC | |
| 2006 | Harley-Davidson | Heritage Softail EFI FLSTI | |
| 2006 | Harley-Davidson | Heritage Softail FLST | |
| 2001-2003 | Harley-Davidson | Heritage Springer EFI FLSTSI | |
| 1999-2003 | Harley-Davidson | Heritage Springer FLSTS | |
| 2001-2006 | Harley-Davidson | Night Train EFI FXSTBI | |
| 1999-2009 | Harley-Davidson | Night Train FXSTB | |
| 2010-2013 | Harley-Davidson | Road Glide Custom FLTRX | |
| 1999-2006 | Harley-Davidson | Road Glide EFI FLTRI | |
| 1999-2002 | Harley-Davidson | Road Glide FLTR | |
| 2007-2009 | Harley-Davidson | Road Glide FLTR | |
| 2015-2017 | Harley-Davidson | Road Glide FLTRX | |
| 2000-2001 | Harley-Davidson | Road Glide Screamin Eagle EFI FLTRSEI | |
| 2015-2017 | Harley-Davidson | Road Glide Special FLTRXS | |
| 2011-2013 | Harley-Davidson | Road Glide Ultra FLTRU | |
| 2016-2017 | Harley-Davidson | Road Glide Ultra FLTRU | |
| 1999-2006 | Harley-Davidson | Road King Classic EFI FLHRCI | |
| 2007-2013 | Harley-Davidson | Road King Classic FLHRC | |
| 2004-2006 | Harley-Davidson | Road King Custom EFI FLHRSI | |
| 2004-2007 | Harley-Davidson | Road King Custom FLHRS | |
| 2000-2006 | Harley-Davidson | Road King EFI FLHRI | |
| 1999-2016 | Harley-Davidson | Road King FLHR | |
| 2002 | Harley-Davidson | Road King Screamin Eagle EFI FLHRSEI | |
| 2003 | Harley-Davidson | Road King Screamin Eagle EFI FLHRSEI2 | |
| 2008-2011 | Harley-Davidson | Rocker C FXCWC | |
| 2008-2009 | Harley-Davidson | Rocker FXCW | |
| 1999 | Harley-Davidson | Softail Custom FXSTC | |
| 2007-2010 | Harley-Davidson | Softail Custom FXSTC | |
| 2005-2006 | Harley-Davidson | Softail Deluxe EFI FLSTNI | |
| 2005-2017 | Harley-Davidson | Softail Deluxe FLSTN | |
| 2001-2006 | Harley-Davidson | Softail Deuce EFI FXSTDI | |
| 2000-2007 | Harley-Davidson | Softail Deuce FXSTD | |
| 2003-2004 | Harley-Davidson | Softail Deuce Screamin Eagle FXSTDSE | |
| 2012-2017 | Harley-Davidson | Softail Slim FLS | |
| 2017 | Harley-Davidson | Softail Slim S FLSS | |
| 2005-2006 | Harley-Davidson | Softail Springer Classic EFI FLSTSCI | |
| 2005-2007 | Harley-Davidson | Softail Springer Classic FLSTSC | |
| 2001-2006 | Harley-Davidson | Softail Springer EFI FXSTSI | |
| 1999-2006 | Harley-Davidson | Softail Springer FXSTS | |
| 2007 | Harley-Davidson | Softail Springer Screamin Eagle FXSTSSE | |
| 2001-2006 | Harley-Davidson | Softail Standard EFI FXSTI | |
| 1999-2007 | Harley-Davidson | Softail Standard FXST | |
| 2006 | Harley-Davidson | Street Glide EFI FLHXI | |
| 2006-2016 | Harley-Davidson | Street Glide FLHX | |
| 2014-2016 | Harley-Davidson | Street Glide Special FLHXS | |
| 2010-2011 | Harley-Davidson | Street Glide Trike FLHXXX | |
| 1999 | Harley-Davidson | Super Glide CVO FXR2 | |
| 1999 | Harley-Davidson | Super Glide CVO FXR3 | |
| 2000 | Harley-Davidson | Super Glide CVO FXR4 | |
| 2009-2013 | Harley-Davidson | Tri Glide Ultra Classic FLHTCUTG | |
| 2015 | Harley-Davidson | Tri Glide Ultra Classic FLHTCUTG | |
| 2016 | Harley-Davidson | Tri Glide Ultra FLHTCUTG | |
| 2016 | Harley-Davidson | Ultra Limited FLHTK | |
| 2016 | Harley-Davidson | Ultra Limited Low FLHTKL | |