Nut Lock

Enhance your heavy equipment’s performance with the Case Construction Nut Lock #12577021. Designed for durability and reliability, this essential component ensures secure fastening, keeping your machinery running smoothly on the toughest job sites. Perfect for Case equipment maintenance and repairs.

Compatible equipment

This part fits 90 - FIAT TRACTOR, 90 DT - FIAT TRACTOR, 90 DT - FIAT TRACTOR (LA), NARROW TRACTOR (LATIN AMERICA), 3 CYL AG TRACTOR ALL PURPOSE, CASE IH MAXXUM TRACTOR (NORTH AMERICA), CASE IH DIESEL TRACTOR, CASE IH MAXXUM TRACTOR, TRACTOR LOADER BACKHOE, 4 CYL AG TRACTOR, 4 CYL AG TRACTOR (LA), 4 CYL AG TRACTOR 40 SERIES, LOADER BACKHOE (NORTH AMERICA), LOADER BACKHOE (NORTH AMERICA) (ASN JJG0020000), CASE SUPER-K CONSTRUCTION KING LOADER BACKHOE, 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, TURBO LOADER BACKHOE, 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, 4 CYL ORCHARD TRACTOR 40 SERIES, CASE CONSTRUCTION KING LOADER BACKHOE, 4 CYL AG TRACTOR (MEXICO ONLY), CASE IH TRACTOR (NORTH AMERICA), 4 CYL TRACTOR LOADER BACKHOE, 6 CYL AG TRACTOR 40 SERIES, 6 CYL ORCHARD TRACTOR 40 SERIES, FORD TRACTOR, CASE IH STEIGER 4WD TRACTOR (FROM S/N 17900650 TO JCB0003599), CASE IH STEIGER 4WD TRACTOR (PRIOR TO S/N 17900650), CASE IH STEIGER 4WD TRACTOR (S/N JCB0003600 & AFTER), CASE IH STEIGER 4WD TRACTOR (AFTER S/N 17900649), CASE TURBO TRENCHER, CRUSHER, WIDE COMFORT CAB, WIDE SUPER COMFORT CAB - 90 SERIES, SPECIAL TRACTOR - L/CAB - TIER 4A, SPECIAL TRACTOR - L/CAB - TIER 4A - MY18, SPECIAL TRACTOR - W/CAB - TIER 4A, SPECIAL TRACTOR - W/CAB - TIER 4A - MY18, AG TRACTOR (MEX), TRACTOR - TIER 4B (MEX), TRACTOR (04/08), TRACTOR, BACKHOE LOADER, CASE IH MAXXUM DIESEL TRACTOR, CASE IH MX SERIES TRACTOR, DELUXE TRACTOR, STANDARD TRACTOR, TRACTOR - TIER 4, TRACTOR - TIER 4B, TRACTOR - TIER 4B - MY18, AUTOCOMMAND TRACTOR - TIER 4, AUTOCOMMAND TRACTOR - STAGE V, AUTOCOMMAND TRACTOR - TIER 4B, AUTOCOMMAND TRACTOR - TIER 4B - MY18, DYNAMIC COMMAND TRACTOR - STAGE V, ELECTRO COMMAND TRACTOR - STAGE V, TRACTOR DUAL CLUTCH - TIER 4B, TRACTOR - TIER 3 PLUS, TRACTOR - TIER 3 ELITE, POWER COMMAND TRACTOR, POWER COMMAND TRACTOR - SERIAL NUMBER Z*BK 40001 --> 50000, RANGE COMMAND TRACTOR, RANGE COMMAND TRACTOR - SERIAL NUMBER Z*BK 40001 --> 50000, CLASSIC TRACTOR - TIER 4B - MY18, CLASSIC TRACTOR - STAGE V, CLASSIC TRACTOR - TIER 4B, AUTOCOMMAND TRACTOR, AUTOCOMMAND TRACTOR - TIER 4B - MY15, CLASSIC TRACTOR - TIER 4B - MY15, SIDEWINDER II TRACTOR - STAGE V, SIDEWINDER II TRACTOR - TIER 4B - MY15, SIDEWINDER II TRACTOR - TIER 4B - MY18, AUTO COMMAND TRACTOR - STAGE V, AUTO COMMAND TRACTOR - TIER 4B - MY18, POWER COMMAND TRACTOR FROM S/N Z9BG07156 / Z9BG40124, POWER COMMAND TRACTOR FROM S/N Z9BG07719 / Z9BG40112, POWER COMMAND TRACTOR FROM S/N Z9BG07XXX / Z9BG40114, POWER COMMAND TRACTOR FROM S/N Z9BG07XXX / Z9BG40117, 6 CYL AG TRACTOR, CRAWLER TRACTOR - W/O CAB - TIER 4A, SUPERSTEER TRACTOR, PLUS/DELUXE TRACTOR, TRACTOR HC - TIER 4B (MEX), TRACTOR (INTERNATIONAL REGIONS INCLUDING MEXICO), TRACTOR (NA) including models 115, 130, 140, 160, 180, 4610N, 4630, 5120, 5130, 5140, 5150, 5220, 5230, 5240, 5250, 555E, 5610S, 5640, 575E, 580K, 580SK, 580SM, 590, 590L, 590SL.

Frequently asked questions

What is the part number?

The manufacturer part number is 12577021.

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.