Nut Lock M12

Enhance your heavy equipment’s performance with the Case Construction Nut Lock M12 #412126. Designed for durability and reliability, this essential component ensures secure fastening, making it perfect for maintaining your machinery’s optimal functionality on any job site.

Compatible equipment

This part fits WHEEL LOADER - TIER 4 (NA), WHEEL LOADER - TIER 4B (NA), GRAIN HEADER, CASE LONG TRACK/TURNABLE LEVELER CRAWLER EXCAVATOR, WHEEL LOADER TIER 4 (NA), SERIES 3 CRAWLER DOZER TIER 3 (NA/EU), CRAWLER DOZER - TIER 4A, CRAWLER DOZER - TIER 4B, VERSATILE LARGE 4WD TRACTOR, POCLAIN CRAWLER EXCAVATOR, COMPACT WHEEL LOADER W/MONO BOOM (NA), CASE CRAWLER EXCAVATOR (NORTH AMERICA), VERSATILE AUGER HEADER SWATHER, SERIES - CASE IH MANURE SPREADERS, NH HAY TEDDER, POCLAIN CRAWLER EXCAVATOR (S/N 12321 & AFTER), POCLAIN CRAWLER EXCAVATOR (S/N 8321 & AFTER), CRAWLER DOZER TIER 3 (NA/EU) (HYDRO), CASE CRAWLER EXCAVATOR, CASE UNI-LOADER SKID STEER LOADER, CASE UNI-LOADER SKID STEER LOADER (NORTH AMERICA), VERSATILE COMBINE - 1981, VERSATILE COMBINE - 1986, VERSATILE COMBINE, PICKUP HEADER, COMBINE PICKUP HEAD, FLEXIBLE GRAIN HEAD, 30F - FLEXIBLE GRAIN HEAD (BR), COMBINE HEADER, GRAIN HEADERS, 15 - GRAIN HEADER (CHN), 17 - GRAIN HEADER (CHN), 20 - GRAIN HEADER (CHN), CASE IH AXIAL-FLOW COMBINE (NA), COMPACT WHEEL LOADER TIER 2 (NA), SMALL WHEEL LOADER, POCLAIN CRAWLER EXCAVATOR - CK (12440-13030) - CL (8441-8714), POCLAIN CRAWLER EXCAVATOR - ELECTRICAL MOTOR (ZAIRE), DROTT LOGGER & HEAVY DUTY CRAWLER EXCAVATOR, 3 CYL AG HIGHWAY TRACTOR, VERSATILE BIDIRECTIONAL TRACTOR, COMBINE CORN HEADER, 20 - FLEXIBLE GRAIN HEADER, 25 - FLEXIBLE GRAIN HEADER, 30 - FLEXIBLE GRAIN HEADER, 35 - FLEXIBLE GRAIN HEADER, CASE IH TRACTOR (AFTER S/N 11070000) (NORTH AMERICA), CASE IH TRACTOR (NORTH AMERICA), 30 - CORN HEADER, 30 - CORN HEAD, ROW INDEPENDENT MAIZHEADER (NA), INTERNATIONAL DIESEL TRACTOR, INTERNATIONAL DIESEL TRACTOR W/SILENT 85 CAB, WEATHER CAB, SKID STEER - BSN N7M425032, SKID STEER - TIER 3 ASN N7M425032, 36 - CORN HEADER, 38 - CORN HEAD, CORN HEADER 8 ROW 22IN SPACING, 38 - CORN HEADER, 70 - CORN HEADER, CORN HEADER 12 ROW 20IN SPACING, CORN HEADER 12 ROW 22IN SPACING, 30 - CORN HEADER 30FT, CORN HEADER 16 ROW 20IN SPACING, CORN HEADER 16 ROW 22IN SPACING, CORN HEADER 18 ROW 20IN SPACING, CORN HEADER 18 ROW 22IN SPACING, SKID STEER - BSN N7M454787, SKID STEER - TIER 3 ASN N7M454787, COMPACT TRACK LOADER - BSN N8M458846, COMPACT TRACK LOADER - TIER 3 ASN N8M458846, SKID STEER TIER 2 P.I.N. N7M458414 & PRIOR, SKID STEER TIER 3 P.I.N. N7M464019 & AFTER, COMPACT TRACK LOADER - BSN N7M464019, COMPACT TRACK LOADER - SERIES 3 ASN N7M464019, 3 CYL TRACTOR LOADER BACKHOE, SKID STEER - TIER 3 ASN N7M452623, SKID STEER BSN N7M452623, CASE IH TRACTOR, HESSTON BIG RECTANGULAR BALER - BELGIUM, AXIAL-FLOW COMBINE (NA), 4 CYL AG TRACTOR 10 SERIES, CASE IH MAXXUM TRACTOR (NORTH AMERICA), COMBINE - TIER 4 COMMON CAB, COMBINE TIER 4, COMBINE - TIER 4 (NA), COMBINE - TIER 4B (NA), COMBINE - TIER 4B (NA) ASN - YFG014001, MY18 COMBINE TIER 4B (NA), CASE IH DIESEL TRACTOR, COMBINE - TIER 3, MY20 COMBINE TIER 4B (NA), CASE WHEEL LOADER (BEFORE S/N JEE0135500), CASE WHEEL LOADER (S/N JEE0135501 & AFTER) - ENGINE SUPPLEMENT, CASE WHEEL LOADER - NA (S/N JEE0135501 & AFTER), WHEEL LOADER TIER 3 (NA), CASE IH MAXXUM TRACTOR, 4 CYL TRACTOR LOADER BACKHOE, 4 CYL AG TRACTOR, 4 CYL AG TRACTOR 40 SERIES, LOADER LANDSCAPER, SERIES 3 LOADER LANDSCAPER TIER 3 - ASN N8C510600, LOADER LANDSCAPER - LIVERY - TIER 4B, LOADER LANDSCAPER - TIER 4B, LOADER LANDSCAPER - TIER 4A ASN NCC570600, CASE CONSTRUCTION KING LOADER BACKHOE AFTER S/N 3739160 (EUROPE), LOADER BACKHOE (NORTH AMERICA), SERIES 2 LOADER BACKHOE - ASN JJG0239360, LOADER BACKHOE (NA) - ASN JJG0285001, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C303000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C500000, BACKHOE LOADER (LIVERY) - TIER 3 NRC, BACKHOE LOADER (LIVERY) - TIER 4B, BACKHOE LOADER - TIER 3 NRC, BACKHOE LOADER - TIER 4A - FROM PIN NCC560000, BACKHOE LOADER - TIER 4B, BACKHOE LOADER 2WD - TIER 3 NRC - MY18, BACKHOE LOADER 2WD - TIER 3 NRC - MY19, BACKHOE LOADER 2WD - TIER 4B - MY18, BACKHOE LOADER 2WD - TIER 4B - MY19, BACKHOE LOADER 4WD - TIER 3 NRC - MY18, BACKHOE LOADER 4WD - TIER 3 NRC - MY19, BACKHOE LOADER 4WD - TIER 4B - MY18, BACKHOE LOADER 4WD - TIER 4B - MY19, LOADER BACKHOE (TIER 3), LOADER BACKHOE - TIER 3 NRC, LOADER BACKHOE - BSN JJG0239361, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C304000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C5040000, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C307000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C508000, BACKHOE LOADER - TIER 4A - FROM PIN NCC564000, LOADER BACKHOE - TIER 3, BACKHOE LOADER (LIVERY) - WIDE TRACK - TIER 3 NRC, BACKHOE LOADER (LIVERY) - WIDE TRACK - TIER 4B, BACKHOE LOADER - WIDE TRACK - TIER 4B, BACKHOE LOADER 4WD - WIDE TRACK - TIER 3 NRC - MY18, BACKHOE LOADER 4WD - WIDE TRACK - TIER 3 NRC - MY19, BACKHOE LOADER 4WD - WIDE TRACK - TIER 4B - MY18, BACKHOE LOADER 4WD - WIDE TRACK - TIER 4B - MY19, BACKHOE LOADER WIDE TRACK - TIER 3, BACKHOE LOADER WIDE TRACK - TIER 3 NRC, BACKHOE LOADER WIDE TRACK - TIER 4A, INTERNATIONAL TRACTOR, HESSTON ROUND BALER - U.S. VERSION, CASE FORKLIFT, SERIES 3 FORKLIFT TIER 3 - ASN N8C510000 (NA), FORKLIFT - LIVERY - TIER 4B, FORKLIFT - TIER 4A, FORKLIFT - TIER 4B, NH BIG BALER, 4 CYL AG TRACTOR MEXICO, NH BIG BALER W/CUTTER, LOADER BACKHOE, SERIES 2 LOADER BACKHOE - ASN JJG0210575, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C309000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C508500, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N7C431854, BACKHOE LOADER - TIER 4A, CASE TURBO HORIZONTAL DIRECTIONAL DRILLING MACHINE, MY18 COMBINE TIER 4B (EU), CASE WHEEL LOADER (PRIOR TO S/N JAK0021701) (NORTH AMERICA), CASE WHEEL LOADER (S/N JAK0021701 & AFTER) (NORTH AMERICA), CASE WHEEL LOADER, WHEEL LOADER WASTE HANDLING - TIER 4A (NA), 4 CYL AG TRACTOR 10 SERIES (U.K. ONLY), NH ROUND BALER, SERIES 1 CRAWLER - 07/01/2002 - 01/31/2005, SERIES 2 CRAWLER TIER 2 - 01/21/2005 - 06/16/2006, SERIES 3 CRAWLER TIER 2 - 06/20/2006 - 12/31/2008, CRAWLER DOZER TIER 3 (HYDRO), MCCORMICK-INTERNATIONAL 6-ROW PLANTER, 4 CYL ORCHARD TRACTOR 10 SERIES, 4 CYL ORCHARD TRACTOR 40 SERIES, COULTER CHISEL - HYDRAULIC DISC LEVER, 4 CYL AG TRACTOR FLAT DECK 10 SERIES, 4 CYL AG TRACTOR (MEXICO ONLY), CASE CRAWLER EXCAVATOR (PRIOR TO S/N CGG0011601), CASE CRAWLER EXCAVATOR (S/N CGG0011601 & AFTER), AXIAL-FLOW COMBINE, CASE IH MAGNUM TRACTOR (NORTH AMERICA), COMBINE - TIER 4B (NA) - 2014, COMBINE - TIER 4B (NA) - 2016, CASE IH MAGNUM TRACTOR, CASE WHEEL LOADER (NORTH AMERICA), WHEEL LOADER - TIER 4 / TIER 2 (NA), COMBINE - TIER 4, COMBINE - TIER 4B (NA) ASN YFG230001, COMBINE - TIER 4B (NA) BSN YFG230000, MY19 COMBINE TIER 4B (NA), ROW INDEPENDENT MAIZHEADER (NA) - 2012, ROW INDEPENDENT MAIZHEADER (NA) - 2015, CRAWLER DOZER TIER 3, PICK-UP HEADER, POCLAIN WHEELED EXCAVATOR, CASE SKID STEER LOADER, CASE SKID STEER LOADER - ASN JAF0318922 (NA) JAF0352169 (EU), COMBINE PICKUP HEADER P.I.N. PPP004000 & PRIOR, COMBINE PICKUP HEADER P.I.N. PPP004001 & AFTER, 6 CYL AG TRACTOR, 6 CYL ORCHARD TRACTOR, 6 CYL AG TRACTOR 40 SERIES, 6 CYL ORCHARD TRACTOR 40 SERIES, COMBINE - BASE UNIT, FORD TRACTOR, CASE WHEEL LOADER (S/N JEE0155000 & BEFORE), CASE WHEEL LOADER (S/N JEE0155001 & AFTER), WHEEL LOADER TIER 3 NA/EU, MY18 COMBINE TIER 4B REDEKOP CHOPPER OPTION (NA), INTERNATIONAL DIESEL TRACTOR (S/N 018000 & AFTER), MOTOR GRADER - DIRECT DRIVE - TIER 3 (BR), MOTOR GRADER - TORQUE CONVERTER - TIER 3 (BR), CASE SKID STEER LOADER - ASN JAF0352234 (NA) JAF0352715 (EU), CASE IH BALE WRAPPER, INTERNATIONAL DIESEL TRACTOR (UP TO S/N 3083), CASE CRAWLER EXCAVATOR (S/N 15401-) (S/N 106801-), CASE CRAWLER EXCAVATOR (S/N 74163-74418) (S/N 15201-), CASE TURNTABLE LEVELER CRAWLER EXCAVATOR, BIDIRECTIONAL TRACTOR W/EMISSIONIZED ENGINE, BIDIRECTIONAL TRACTOR, GRAPE HARVESTER, GRAPE HARVESTER - GRANDE EXPORT VERSION, GRAPE HARVESTER - HIGHER VERSION, GRAPE HARVESTER - SIDE HOPPER VERSION, GRAPE HARVESTER - STANDARD VERSION, GRAPE HARVESTER - GRANDE EXPORT VERSION., GRAPE HARVESTER - OLIVE VERSION, GRAPE HARVESTER - OLIVE GRAND EXPORT VERSION - 2013, CASE SKID STEER LOADER - ASN JAF0320050 (NA) JAF0274262 (EU), LARGE 4WD TRACTOR, WHEEL LOADER TIER 3 (NA/EU), VERSATILE 4WD TRACTOR, VERSATILE TRACTOR, SERIES - CARRARO TRACTOR AXLE, CASE SKID STEER LOADER - ASN JAF0311357 (NA) JAF0274360 (EU), 1230 - CORN HEADER, 830 - CORN HEADER, 575 - CORN HEADER, 630 - CORN HEADER, 836 - CORN HEADER, 838 - CORN HEADER, C9 12V ENGINE, SUGAR CANE HARVESTER (BRAZIL) (TYRE MACHINE) - ASN 880001, SUGAR CANE HARVESTER TYRE MACHINE - TIER 3 (INT) - MY17, SUGAR CANE HARVESTER TYRE MACHINE - TIER 3 (NAR) - MY17, SUGAR CANE HARVESTER (BRAZIL) (TRACK MACHINE) - ASN 880001, SUGAR CANE MULTI ROW BR, SUGAR CANE HARVESTER TRACK MACHINE - TIER 3 (NAR) - MY17, SUGAR CANE HARVESTER TRACK MACHINE - SR - T4.B (NAFTA), SUGAR CANE HARVESTER TRACK MACHINE SR - TIER 3, BACKHOE LOADER - TIER 3, BACKHOE LOADER - STRAIGHT LOADER ARM (LIVERY) - TIER 3 NRC (LAR), BACKHOE LOADER CENTER PIVOT STRAIGHT LOADER ARM 2WD - TIER 3 - MY19, BACKHOE LOADER CENTER PIVOT STRAIGHT LOADER ARM 4WD (LAR) - TIER 3 - MY19, BACKHOE LOADER (LIVERY) - TIER 4B (NA), BACKHOE LOADER CENTER PIVOT STRAIGHT LOADER ARM 2WD - TIER 4B - MY19, BACKHOE LOADER CENTER PIVOT STRAIGHT LOADER ARM 4WD - TIER 4B - MY19, NH BALE WRAPPER, BACKHOE LOADER CENTER PIVOT STRAIGHT LOADER ARM 4WD - TIER 3 - MY19, BACKHOE LOADER - STRAIGHT LOADER ARM (LIVERY) - TIER 3 NRC, BACKHOE LOADER - TOOL CARRIER (LIVERY) - TIER 3 NRC, BACKHOE LOADER CENTER PIVOT TOOL CARRIER 4WD - TIER 3 - MY19 including models 1021F, 1021G, 1030, 1088, 1121F, 1121G, 1150K, 1150M LT, 1150M WT, 1150M WT/LGP, 1150V, 1156V, 115CL, 121E, 125B, 1400V, 1500, 156, 160CK, 160CKS, 160CL, 162, 1650L, 1650M LGP PAT, 1650M WT/LGP.

Frequently asked questions

What is the part number?

The manufacturer part number is 412126.

Is this a genuine OEM part?

Yes. Southeastern Equipment stocks OEM and quality aftermarket parts for heavy equipment. Contact us if you need a specific OEM source or aftermarket option.

Will this fit my machine?

See the compatible equipment list above. If your model is not listed, call us with your machine's serial number and we can confirm.

Where does this ship from?

Southeastern Equipment Company ships parts nationwide from our US warehouse. Orders placed before 2 PM ET typically ship same day.

Free pickup at any of our 17 branches across Ohio, Indiana, Michigan, and Kentucky. Select your preferred branch at checkout.

30-day no-fault returns. Bought the wrong part? Send it back for a full refund — no restocking fees, no minimums.