NGK Spark Plug Dimensions: 14mm Plugs
NGK Spark Plug Dimensions: 14mm Plugs
683 plugs. The physical dimensions of each plug in the NGK range: thread size, reach, hex, seat type and whether the tip is projected. This is what decides whether a plug will physically fit and seal, before heat range comes into it. Plug codes are links — click one to go straight to that plug on our shop.
Reach and seat type are not interchangeable. A plug that is too long can hit the piston; one that is too short leaves thread exposed in the combustion chamber and will not transfer heat properly. A tapered-seat plug will not seal in a gasket-seat head. Match all of thread, reach and seat, then match the heat range.
14mm Spark Plugs 683 plugs
| NGK plug | Range | Reach | Hex | Seat | Notes |
|---|---|---|---|---|---|
| BCPR5EIX · BCPR6EIX · BCPR7EIX | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected |
| BCPR5EIX-11 · BCPR6EIX-11 · BCPR7EIX-11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected Wide Gap |
| BKR4EIX · BKR5EIX · BKR6EIX · BKR7EIX · BKR8EIX · BKR9EIX | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series |
| BKR5EIX-11 · BKR6EIX-11 · BKR7EIX-11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series Wide Gap |
| BPR5EIX · BPR6EIX · BPR7EIX · BPR8EIX · BPR9EIX · BPR10EIX | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BPR5EIX-11 · BPR6EIX-11 | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| BPR6HIX · BPR7HIX · BPR8HIX | Iridium | 1/2" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BR6FIX · YR5IX | Iridium | .460" Reach | 5/8" Hex | Tapered, Solid | |
| BR6HIX · BR7HIX · BR8HIX · BR9HIX · BR10HIX | Iridium | 1/2" Reach | 13/16" Hex | Gasket, Loose | |
| BR7EIX · BR8EIX · BR9EIX · BR10EIX | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Loose | |
| BR8ECMIX · BR9ECMIX · BR10ECMIX | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Solid | Compact |
| BR8ECSIX · BR9ECSIX | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Solid | Low Angle |
| BR8EIX SOLID · BR9EIX SOLID · BR10EIX SOLID · IGR7A-G | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Solid | |
| BR9ECSIX-5 | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Solid | Low Angle, Narrow Gap |
| DFH6B-11A · DILFR5A11 · DILFR5A11D · DILFR5C11D · DILFR6D11 · DILFR6J11 · DILFR7B10G · DILFR7K9G | Iridium | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected, Wide Gap Dual Fine Electrode |
| DIFR5C11 · DIFR6C11 · DIFR6D13 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected Dual Fine Electrode Wide Gap |
| FR5EI · FR6EI · IFR5T-8N · IFR6B · IFR6B-K · IFR6Q-G · IFR7F-4D · IFR7F-8DS · IFR7X7G | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series |
| FR9BI-11 · IFR5D10 · IFR5E11 · IFR5G11 · IFR5G-11K · IFR5J11 · IFR5L11 · IFR5N10 · IFR5T11 · IFR6B11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series Wide Gap |
| GR4IX · GR5IX | Iridium | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected |
| IFR6D10 · IFR6E11 · IFR6G-11K · IFR6J11 · IFR6L11 · IFR6T11 · IFR6V-10G · IFR7G-11KS · IFR7L11 · IFR8H11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series Wide Gap |
| IFR9H11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series Wide Gap |
| ILFR5B11 · ILFR5T11 · ILFR6J-11K · ILFR6T11 · LFR5AIX-11 · LFR6AIX-11 · SILFR6A11 | Iridium | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected, Wide Gap |
| ILFR6A · ILFR6B · ILFR6G-E · ILFR7H · LFR6AIX · LFR7AIX · SILFR6A | Iridium | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected |
| ILTR5B11 · ILTR5C11 · ILTR5E11 · ILTR5K13 · ILTR5L11 · ILTR6B11 · ILTR6E11 · LTR5BI-13 · LTR5IX-11 · LTR6AI13 | Iridium | 25mm Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| ILTR5D · ILTR5M9G · ILTR6A-8G · ILTR6F9 · ILTR6G8G · ILTR6M9G · ILTR7E9 · ILTR7N8 · LTR6BI-9 · LTR6CI-8 | Iridium | 25mm Reach | 5/8" Hex | Tapered, Solid | Projected |
| ILTR6H8G | Iridium | 25mm Reach | 5/8" Hex | Tapered, Loose | Projected |
| ILZFR6D11 · LZFR5AIX-11E · LZFR5BI-11 · LZFR5CI-11 | Iridium | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Wide Gap Extended Projection |
| ILZTR6A8G | Iridium | 25mm Reach | 5/8" Hex | Tapered, Solid | Extend Shell Extended Projection |
| ITR4A15 · ITR5H13 · ITR6F13 · TR5AI-13 · TR55IX · TR65IX | Iridium | .708" Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| IZFR5B · IZFR5G · IZFR5J · IZFR6J · IZFR6N-E · IZFR6Q · IZFR7M · ZFR5FIX-E | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection |
| IZFR5K11 · IZFR5L11 · IZFR6F11 · IZFR6H11 · IZFR6K11 · IZFR6K13 · IZFR6K-11E · IZFR6K-11S · ZFR5AIX-11 · ZFR5FIX-11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection Wide Gap |
| IZTR4A11 · IZTR5B11 | Iridium | .708" Reach | 5/8" Hex | Tapered, Solid | Extended Projection Wide Gap |
| LTR6BI-13 · LTR6IX-11 · LTR7IX-11 | Iridium | 25mm Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| LTR6DI-8 · LTR6IX · LTR61X · SILTR6A7G | Iridium | 25mm Reach | 5/8" Hex | Tapered, Solid | Projected |
| LZFR6AI | Iridium | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Extended Projection |
| LZTR4AIX-11 · LZTR5AIX-13 · LZTR6AIX-13 · LZTR7AIX-13 | Iridium | 25mm Reach | 5/8" Hex | Tapered, Solid | Extended Projection Wide Gap |
| RE7C-L | Iridium | 21mm Reach | 13/16" Hex | Gasket, Solid | Slant/Slit |
| RE9B-T | Iridium | 19mm Reach | 13/16" Hex | Gasket, Solid | Slant/Slit |
| SIFR6A11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected PSPE Wide Gap |
| SILFR5A11 · SILFR6C11 | Iridium | 26.5mm Reach | 5/8" Hex | Gasket, Solid, PSPE | Projected, Wide Gap |
| SILFR6B8 | Iridium | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected, PSPE |
| TR4IX · TR5IX · TR6IX · TR7IX · TR8IX | Iridium | .708" Reach | 5/8" Hex | Tapered, Solid | Projected |
| TR5-1IX | Iridium | .708" Reach | 5/8" Hex | Tapered, Solid | Projected Extended Shell |
| TR45-1IX · TR55-1IX | Iridium | .708" Reach | 5/8" Hex | Tapered, Solid | Projected Extended Shell Wide Gap |
| UR4IX · UR5IX · UR6IX | Iridium | .460" Reach | 5/8" Hex | Tapered, Solid | Projected |
| UR45IX · UR55IX | Iridium | .460" Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| XR4IX · XR5IX | Iridium | 3/8" Reach | 13/16" Hex | Gasket, Solid | Projected |
| XR45IX | Iridium | 3/8" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| YR55IX | Iridium | .460" Reach | 5/8" Hex | Tapered, Solid | Wide Gap |
| ZFR5FIX-11E · ZFR6AIX-11S · ZFR6FIX-11 | Iridium | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection Wide Gap |
| R5670-5 · R5670-6 · R5670-7 · R5670-8 · R5670-9 | NGK Racing | 3/8" Reach | 13/16" Hex | Gasket, Solid | Projected V-Power Non-Resistor |
| R5673-6 · R5673-7 · R5673-8 | NGK Racing | .460" Reach | 5/8" Hex | V-Power | |
| BCPR5EGP · BCPR5EP-8 · BCPR6EGP | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected |
| BCPR5EP-11 · BCPR6EP-11 · BCPR6EP-N-8 · BCPR6EP-N-11 · PFR5A-11 · PFR6A-11 · PFR6H-10 · PFR7H-10 | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected Wide Gap |
| BKR5EGP · BKR6EGP · BKR6EP-8 | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series |
| BKR5EKPB-11 · BKR6EKPB-11 | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected 2-Ground Electrode Wide gap |
| BKR5EKUP | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected Semi-Surface Discharge |
| BKR5EP-11 · BKR6EP-11 | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series Wide Gap |
| BKR6EQUP · BKR7EQUP | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | 4-Ground Electrode |
| BPR5EGP · BPR6EGP | Platinum | 3/4" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BPR5EP-11 · GR45GP · PGR5A-11 · PGR5C-11 | Platinum | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| BUR7EQP · BUR9EQP | Platinum | 21.5 mm Reach | 13/16" Hex | Gasket, Solid | 4-Ground Electrode |
| FR4GP · FR5GP · PFR6B · PFR6G · PFR6Q · PFR7AB · PFR7B · PFR7N8DS · PFR7Q · PFR7S8EG | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series |
| FR5AP-10 · FR5AP-11 · FR5AP-11E · FR45GP · PFR5B-11 · PFR5B-11B · PFR5C-11 · PFR5G-11 · PFR5G-13E · PFR5J-11 | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series Wide Gap |
| GR4GP · GR5GP · PGR6A · PGR7A | Platinum | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected |
| ITR6G9 | Platinum | .708" Reach | 5/8" Hex | Tapered, Loose | |
| LFR6CGP · PLFR6A-11 · PLFR6C-10G | Platinum | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected, Wide Gap |
| LTR5GP · LTR6GP-8 | Platinum | 25mm Reach | 5/8" Hex | Tapered, Solid | Projected |
| LTR6BP13 · LTR6DP13 · LTR6GP · LTR7CP13 · PLTR6A-10G · PTR5A-13 | Platinum | 25mm Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| LZFR5AGP-E · LZFR6AP116S · PLZFR5B13EG · PLZFR6A-11S | Platinum | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Wide Gap Extended Projection |
| LZTR4AGP · LZTR5AGP · LZTR6AP11EG · PLZTR4A-13 · PLZTR5A-13 | Platinum | 25mm Reach | 5/8" Hex | Tapered, Solid | Extended Projection Wide Gap |
| PFR5L-11 · PFR5N-11 · PFR5R-11 · PFR6B-11 · PFR6G-11 · PFR6G-13 · PFR6G-13E · PFR6J-11 · PFR6L-11 · PFR6L-13 | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series Wide Gap |
| PFR6N-11 · PFR6T-10G · PFR6U-11G · PFR6X-11 · PFR7G-11 · PFR7G-11S | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series Wide Gap |
| PFR6W-TG · PFR7W-TG | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | 3-Ground Electrode |
| PFR8S8EG | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series |
| PLFER7A8EG | Platinum | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected |
| PLFR5A-11 | Platinum | 26.5mm Reach | 5/8" Hex | Gasket, Solid, PSPE | Projected, Wide Gap |
| PTR4B-15 · PTR4G-15 · PTR5C-13 · PTR5D-13 · PTR5F-11 · PTR6D-13 · TR5BP12 · TR6AP-13 · TR6AP-13E · TR55GP | Platinum | .708" Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| PTR5D-10 · TR4GP · TR5GP · TR6GP | Platinum | .708" Reach | 5/8" Hex | Tapered, Solid | Projected |
| PZFR5D-11 · PZFR5F-11 · PZFR5J-11 · PZFR5Q-11 · PZFR6E-11 · PZFR6F-11 · PZFR6J-11 · ZFR5LP-13G · ZFR6AGP | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection Wide Gap |
| PZFR5F · PZFR6F · PZFR6H · PZFR7G-G · ZFR5AP · ZFR5BGP · ZFR5EGP · ZFR5FGP · ZFR5FGP-8E · ZFR5FGP-E | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection |
| PZTR5A-15 | Platinum | .708" Reach | 5/8" Hex | Tapered, Solid | Extended Projection Wide Gap |
| TR5-1GP | Platinum | .708" Reach | 5/8" Hex | Tapered, Solid | Projected Extended Shell |
| TR45-1GP · TR55-1GP | Platinum | .708" Reach | 5/8" Hex | Tapered, Solid | Projected Extended Shell Wide Gap |
| UR4GP · UR5GP · UR6GP | Platinum | .460" Reach | 5/8" Hex | Tapered, Solid | Projected |
| UR45GP | Platinum | .460" Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| YR5GP | Platinum | .460" Reach | 5/8" Hex | Tapered, Solid | |
| ZFR6BGP-S · ZFR6FGP | Platinum | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection |
| ZGR5AGP | Platinum | 3/4" Reach | 13/16" Hex | Gasket, Solid | Extended Projection |
| FR5AHX · FR6AHX-S | Ruthenium HX | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected Wide Gap Dual Fine Electrode |
| FR5AHX-E | Ruthenium HX | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected Dual Fine Electrode |
| FR6BHX-S · FR7BHX-S | Ruthenium HX | 3/4" Reach | 5/8 Hex | Gasket, Solid | ISO Projected PSPE |
| TR4BHX | Ruthenium HX | .708" Reach | 5/8" Hex | Tapered, Solid | Projected PSPE |
| TR5AHX · TR6AHX | Ruthenium HX | .708" Reach | 5/8" Hex | Tapered, Solid | Projected Wide Gap Dual Fine Electrode |
| B2-LM · B4-LM | Standard, non-resistor | 3/8" Reach | 13/16" Hex | Gasket, Loose | Compact |
| B4-L · B6-L | Standard, non-resistor | 7/16" Reach | 13/16" Hex | Gasket, Loose | |
| B4ES · B5ES · B6ES · B7ES · B8ES · B9ES · B10ES | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | |
| B4H · B5HS · B6HS · B7HS · B8HS · B9HS · B10HS | Standard, non-resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | |
| B6ES-11 · B7ES-11 | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Wide Gap |
| B6HS-10 · B7HS-10 · B8HS-10 · B9HS-10 | Standard, non-resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | Wide Gap |
| B6S · B7S · B8S · B-2 · B-4 | Standard, non-resistor | 3/8" Reach | 13/16" Hex | Gasket, Loose | |
| B7ES SOLID · B8ES SOLID · B9ES SOLID | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | |
| B8EFS · B9EFS | Standard, non-resistor | .708" Reach | 5/8" Hex | Tapered, Loose | |
| BCP4ES-11 · BCP6ES-11 | Standard, non-resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected Wide Gap |
| BCP5ES · BCP6ES · BCP7ES | Standard, non-resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected |
| BCP6ET | Standard, non-resistor | 3/4" Reach | 5/8" Hex | Gasket, Loose | 3-Ground Electrode JIS Projected |
| BM4A · BM6A · BM7A | Standard, non-resistor | 3/8" Reach | 3/4" Hex | Gasket, Loose | Compact |
| BM4A SOLID · BM6A SOLID | Standard, non-resistor | 3/8" Reach | 3/4" Hex | Gasket, Solid | Compact |
| BM6F · BM7F | Standard, non-resistor | 3/8" Reach | 5/8" Hex | Tapered, Loose | Compact |
| BP4ES · BP5ES · BP6ES · BP7ES · BP8ES · BP9ES | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BP4HS · BP5HS · BP6HS · BP7HS · BP8HS | Standard, non-resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BP4HS-10 · BP6HS-10 · BP7HS-10 · BP8HS-10 | Standard, non-resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | Projected, Wide Gap |
| BP5EA-L · BP5ES SOLID · BP6ES SOLID · BP7ES SOLID · BP8ES SOLID | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected |
| BP5ES-11 · BP6ES-11 | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| BP6ET | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | 3-Ground Electrode Projected |
| BP7EFS | Standard, non-resistor | .708" Reach | 5/8" Hex | Tapered, Loose | Projected |
| BP8HS-15 | Standard, non-resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| BPM4A · BPM6A · BPM7A | Standard, non-resistor | 3/8" Reach | 3/4" Hex | Gasket, Loose | Compact, Projected |
| BPM6A-10 | Standard, non-resistor | 3/8" Reach | 3/4" Hex | Gasket, Solid | Compact, Projected Wide Gap |
| BPM6F | Standard, non-resistor | 3/8" Reach | 5/8" Hex | Tapered, Solid | Compact, Projected |
| BPM7A SOLID | Standard, non-resistor | 3/8" Reach | 3/4" Hex | Gasket, Solid | Compact, Projected |
| BU8H · BUH · BUHX | Standard, non-resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | Surface Discharge |
| BUE | Standard, non-resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Surface Discharge |
| BUHW · BUHW-2 · BUHXW-1 | Standard, non-resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | Tungsten Electrode |
| BCPR5ES · BCPR6ES · BCPR7ES | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected |
| BCPR5ES-11 · BCPR6ES-11 · BCPR7ES-11 | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected Wide Gap |
| BCPR7ET | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Loose | 3-Ground Electrode JIS Projected |
| BKR4ESA-11 · BKR5ES-11 · BKR5ESA-11 · BKR6ES-11 · BKR7ES-11 | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series Wide Gap |
| BKR5EK · BKR6EK · BKR6EKC · BKR7EKC-N | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected 2-Ground Electrode |
| BKR5EKB-11 | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected 2-Ground Electrode Wide gap |
| BKR5EKU · BKR6EKU · BKR6EKUB · BKR6EKUE · BKR7EKU | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected Semi-Surface Discharge |
| BKR5ES · BKR6ES | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series |
| BKR6EKE | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Loose | ISO Projected 2-Ground Electrode |
| BKR6EQUA | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | 4-Ground Electrode |
| BKUR6ET · BKUR6ET-10 · BKUR6ETB · BKUR7ET | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | 3-Ground Electrode |
| BMR2A · BMR4A · BMR6A · BMR7A | Standard, resistor | 3/8" Reach | 3/4" Hex | Gasket, Loose | Compact |
| BMR2A SOLID · BMR4A SOLID · BMR6A SOLID | Standard, resistor | 3/8" Reach | 3/4" Hex | Gasket, Solid | Compact |
| BMR2A-10 | Standard, resistor | 3/8" Reach | 3/4" Hex | Gasket, Loose | Compact, Wide Gap |
| BPMR4A SOLID · BPMR7A SOLID | Standard, resistor | 3/8" Reach | 3/4" Hex | Gasket, Solid | Compact, Projected |
| BPMR4A-10 · BPMR6A-10 | Standard, resistor | 3/8" Reach | 3/4" Hex | Gasket, Solid | Compact, Projected Wide Gap |
| BPMR6A · BPMR7A | Standard, resistor | 3/8" Reach | 3/4" Hex | Gasket, Loose | Compact, Projected |
| BPMR6F | Standard, resistor | 3/8" Reach | 5/8" Hex | Tapered, Loose | Compact, Projected |
| BPR2ES · BPR4ES · BPR5ES · BPR6ES · BPR7ES · BPR8ES | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BPR2ES SOLID · BPR4ES SOLID · BPR5ES SOLID · BPR6ES SOLID · BPR7ES SOLID · BPR9ES · GR9A-EG | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected |
| BPR4ES-11 · BPR5ES-11 · BPR6ES-11 · BPR7ES-11 | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| BPR4ES-H | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Extended Thread Shell Projected |
| BPR4HS · BPR5HS · BPR6HS · BPR7HS · BPR8HS | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BPR4HS-10 · BPR6HS-10 · BPR7HS-10 | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | Projected, Wide Gap |
| BPR5EFS-13 · TR5C-12 | Standard, resistor | .708" Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| BPR5EKU | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | Projected 2-Ground Electrode |
| BPR6EFS | Standard, resistor | .708" Reach | 5/8" Hex | Tapered, Solid | Projected |
| BPR6EKN | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected 2-Ground Electrode |
| BPR6FS | Standard, resistor | .460" Reach | 5/8" Hex | Tapered, Solid | Projected |
| BPR6HSA | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Stud | Projected |
| BPZ8HS-10 · BPZ8HS-15 | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap Inductive Resistor |
| BR2-LM · BR4-LM | Standard, resistor | 3/8" Reach | 13/16" Hex | Gasket, Loose | Compact |
| BR2-LM SOLID | Standard, resistor | 3/8" Reach | 13/16" Hex | Gasket, Solid | Compact |
| BR4ES · BR5ES · BR6ES · BR7ES · BR8ES · BR9ES · BR10ES | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | |
| BR4HS · BR5HS · BR6HS · BR7HS · BR8HS · BR9HS | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | |
| BR6ES-11 · BR8ES-11 | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Wide Gap |
| BR6FS | Standard, resistor | .460" Reach | 5/8" Hex | Tapered, Solid | |
| BR6HS-10 · BR7HS-10 · BR8HS-10 · BR9HS-10 | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | Wide Gap |
| BR6HSA · BR8HSA | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Stud | |
| BR6S | Standard, resistor | 3/8" Reach | 13/16" Hex | Gasket, Loose | |
| BR7EFS | Standard, resistor | .708" Reach | 5/8" Hex | Tapered, Solid | |
| BR7ES SOLID · BR8ES SOLID · BR9ES SOLID · BR10ES SOLID | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | |
| BR7ET · BR8ET · BR9ET | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | 3-Ground Electrode |
| BR8ECM · BR9ECM · BR10ECM | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Compact |
| BR8ECS · BR9ECS · BR10ECS SOLID | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Low Angle |
| BR8EQ-14 · BR9EQ-14 | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | 4-Ground Electrode Wide Gap |
| BR8HCS-10 | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Loose | Low Angle Ground Electrode Wide Gap |
| BR8HS SOLID | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | |
| BR9ECS-5 | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Low Angle, Narrow Gap |
| BUR4EB-11 · BUR5EB-11 · BUR6EB-11 · BUR7EB-11 | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Solid | Semi-Surface Discharge Wide Gap |
| BUR6ET | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | 3-Ground Electrode Projected |
| BUR7EQ · BUR9EQ | Standard, resistor | 21.5 mm Reach | 13/16" Hex | Gasket, Solid | 4-Ground Electrode |
| BUZ8H | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | Surface Discharge Inductive Resistor |
| BUZHW · BUZHW-2 | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | Tungsten Electrode Inductive Resistor |
| BZ7HS-10 | Standard, resistor | 1/2" Reach | 13/16" Hex | Gasket, Solid | Inductive Resistor, Wide Gap |
| FR2B-D | Standard, resistor | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected Partial Thread FR - Series |
| LFR6D | Standard, resistor | 26.5mm Reach | 5/8" Hex | Gasket, Solid | 3-Ground Electrode |
| LZFR5C-11 | Standard, resistor | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Wide Gap Extended Projection |
| ZGR5A | Standard, resistor | 3/4" Reach | 13/16" Hex | Gasket, Loose | Extended Projection |
| B2LMY BL1 · B4LMY BL1 | V-Power | 3/8" Reach | 13/16" Hex | Gasket, Loose | Compact |
| B6LY BL1 | V-Power | 7/16" Reach | 13/16" Hex | Gasket, Loose | |
| BCPR5E-11 · BCPR5EY-11 · BCPR6E-11 · BCPR6EY-11 · BCPR6EY-N-11 · BCPR7EY-11 | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected Wide Gap |
| BCPR5EY · BCPR6E | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | JIS Projected |
| BKR4E · BKR5E · BKR5EY · BKR5EYA · BKR6E · BKR6EY · BKR6EYA · BKR6EZB · BKR7E · BKR7E-E | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series |
| BKR4E-11 · BKR5E-11 · BKR5E-N-11 · BKR5EY-11 · BKR5EYA-11 · BKR6E-11 · BKR6E-N-11 · BKR7E-11 | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected BK-Series Wide Gap |
| BM4Y BL1 · BM6Y BL1 · BM7Y BL1 | V-Power | 3/8" Reach | 3/4" Hex | Gasket, Loose | Compact |
| BM6FY BL1 | V-Power | 3/8" Reach | 5/8" Hex | Tapered, Loose | Compact |
| BP5EY · BPR5EY BL1 · BPR6EY BL1 | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Loose | Projected |
| BP6EY · BPR4EY · BPR5EY · BPR6EY · GR4 · GR5 | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected |
| BP8H-N-10 | V-Power | 1/2" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| BPM6Y · BPM7Y · BPM7Y BL1 | V-Power | 3/8" Reach | 3/4" Hex | Gasket, Loose | Compact, Projected |
| BPM8Y S25 SOLID · BPM8Y SOLID · BPMR6Y BL1 · BPMR7Y · BPMR8Y | V-Power | 3/8" Reach | 3/4" Hex | Gasket, Solid | Compact, Projected |
| BPR5EY-11 · BPR6EY-11 · GR45 | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| BPZ8H-N-10 | V-Power | 1/2" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap Inductive Resistor |
| BR6EB-L-11 | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Solid | Wide Gap |
| BR6EF · BR7EF | V-Power | .708" Reach | 5/8" Hex | Tapered, Solid | |
| BR9EYA · BR10EYA | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Solid | |
| BUR6EA-11 · BUR7EA-11 | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Solid | Semi-Surface Discharge Wide Gap |
| FR4 · FR5 | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series |
| FR5-1 | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection Extended Shell Projection |
| FR45 | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Projected FR-Series Wide Gap |
| LFR4A-E · LFR6A | V-Power | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected |
| LFR5A-11 · LFR6A-11 · LFR6C-11 | V-Power | 26.5mm Reach | 5/8" Hex | Gasket, Solid | Projected, Wide Gap |
| LZTR4A-11 · LZTR5A-13 | V-Power | 25mm Reach | 5/8" Hex | Tapered, Solid | Extended Projection Wide Gap |
| TR4 · TR5 · TR6 | V-Power | .708" Reach | 5/8" Hex | Tapered, Solid | Projected |
| TR5-1 | V-Power | .708" Reach | 5/8" Hex | Tapered, Solid | Projected Extended Shell |
| TR55 | V-Power | .708" Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| TR55-1 | V-Power | .708" Reach | 5/8" Hex | Tapered, Solid | Projected Extended Shell Wide Gap |
| UR4 · UR5 · UR6 | V-Power | .460" Reach | 5/8" Hex | Tapered, Solid | Projected |
| UR45 · UR55 | V-Power | .460" Reach | 5/8" Hex | Tapered, Solid | Projected, Wide Gap |
| XR4 · XR5 | V-Power | 3/8" Reach | 13/16" Hex | Gasket, Solid | Projected |
| XR45 | V-Power | 3/8" Reach | 13/16" Hex | Gasket, Solid | Projected, Wide Gap |
| YR5 | V-Power | .460" Reach | 5/8" Hex | Tapered, Solid | |
| YR55 | V-Power | .460" Reach | 5/8" Hex | Tapered, Solid | Wide Gap |
| ZFR4F-11 · ZFR5A-11 · ZFR5D-11 · ZFR5E-11 · ZFR5F-11 · ZFR5J-11 · ZFR6A-11 · ZFR6F-11 · ZFR6F-11G · ZFR6J-11 | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection Wide Gap |
| ZFR5F · ZFR5F-4 · ZFR5N · ZFR7F | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection |
| ZFR6K-9E · ZFR6U-9 · ZFR7F-11 | V-Power | 3/4" Reach | 5/8" Hex | Gasket, Solid | ISO Extended Projection Wide Gap |
| ZGR5A-4 | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Solid | Extended Projection |
| ZGR5C | V-Power | 3/4" Reach | 13/16" Hex | Gasket, Solid | Extended Projection Extended Shell |
Reading the specification
Reach is the threaded length that screws into the head. Hex is the spanner size — 5/8" and 13/16" are the two common plug sockets. Seat is how the plug seals: a gasket seat uses a captive washer, a tapered seat seals on the cone and takes no washer. Solid and loose describe the gasket, and stud means the terminal nut screws off so the plug takes either a threaded or a push-on cap.
Projected means the insulator nose reaches further into the chamber, which suits engines designed for it and can foul or contact in engines that are not. Wide gap plugs come pre-gapped wider for high-energy ignition systems. Fit what the engine manufacturer specifies rather than substituting on dimensions alone.