Square Nut

Enhance your heavy equipment’s performance with the Case Construction Square Nut #R25688. Designed for durability and precision, this essential part ensures secure connections in your machinery, optimizing efficiency and reliability on the job site. Perfect for Case equipment maintenance and repairs.

Compatible equipment

This part fits CASE CRAWLER EXCAVATOR, CASE CRAWLER TRACTOR, CASE CRAWLER TRACTOR (NORTH AMERICA), SERIES 3 CRAWLER DOZER TIER 3 (NA/EU), CRAWLER DOZER - TIER 4A, CASE LOGGER CRAWLER EXCAVATOR, DROTT SERIES-B FELLER/BUNCHER CRAWLER EXCAVATOR, DROTT SERIES-B CRAWLER EXCAVATOR, DROTT SERIES-A CRAWLER EXCAVATOR, 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 including models 1080, 1080B, 1150B, 1150C, 1150D, 1150E, 1150G, 1150H, 1150K, 1150M LT, 1150M WT/LGP, 1155D, 1155E, 1187, 1187B, 1280, 1280B, 40BLC, 40EC, 40YC, 50, 650G, 650H, 650K, 750H.

Frequently asked questions

What is the part number?

The manufacturer part number is R25688.

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.