Nut Lock M4

Enhance your heavy equipment’s performance with the Case Construction Nut Lock M4 #385681. Designed for durability and reliability, this essential component ensures secure fastening, keeping your machinery running smoothly on any job site. Perfect for Case equipment maintenance and repairs.

Compatible equipment

This part fits SKID STEER - SERIES 3 410 NA ASN N7M480924 410 EU ASN N7M468736, SKID STEER - TIER 3 420NA N7M466710 420EU ASN N8M466713, COMPACT TRACK LOADER - SERIES 3 ASN N7M455401, SKID STEER - SERIES 3 ASN 430 NA N7M479683 430 EU N7M479546, SKID STEER - TIER 3 ASN N7M425032, SKID STEER - SERIES 3 440 NA ASN N8M474469 440 EU ASN N8M407542, COMPACT TRACK LOADER - SERIES 3 ASN N7M483467, SKID STEER - TIER 3 ASN N7M454787, COMPACT TRACK LOADER - TIER 3 ASN N8M458846, SKID STEER TIER 3 P.I.N. N7M464019 & AFTER, COMPACT TRACK LOADER - SERIES 3 ASN N7M464019, SKID STEER - TIER 3 ASN N7M452623, 4WD MOTOR GRADER (LIVERY) - TIER 4, 4WD MOTOR GRADER MY20 - STAGE V, AWD MOTOR GRADER (LIVERY) - TIER 4, AWD MOTOR GRADER MY20 - STAGE V, SKID STEER LOADER - NRC, SKID STEER LOADER - TIER 4B, SKID STEER LOADER, SKID STEER LOADER - TIER 4A, SKID STEER LOADER - TIER 4B-C, SKID STEER LOADER TIER 4, COMPACT TRACK LOADER - NRC, COMPACT TRACK LOADER - TIER 4B, COMPACT TRACK LOADER - TIER 4A, COMPACT TRACK LOADER - TIER 4B-C including models 410, 420, 420CT, 430, 435, 440, 440CT, 445, 445CT, 450, 450CT, 465, 836C, 836C AWD, 856C, 856C AWD, SR130, SR150, SR160, SR175, SR200, SR210, SR220, SR240, SR250.

Frequently asked questions

What is the part number?

The manufacturer part number is 385681.

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.

Ships nationwide. In-stock parts ordered before 2:30 PM ET ship the same business day. Your exact shipping cost and delivery estimate are calculated at checkout from your ZIP code and the part’s size and weight; oversized and truck-freight items may need extra transit time and freight charges.

Free branch pickup is also available across Ohio, Indiana, Michigan, and Kentucky — just choose it at checkout.

30-day returns. New, unused parts in original packaging may be returned within 30 days. Some items — including electrical, special-order, and direct-from-supplier parts — are non-returnable. See our full return policy.