NUT.31-18 Nylock Zinc

Genuine Briggs & Stratton OEM · Part number 15X123MA

The NUT.31-18 Nylock Zinc is a genuine Briggs & Stratton hardware part, OEM part number 15X123MA. Dykes Motors sells it for $3.38. It is in stock to order online, or you can pick it up at our store. Not sure it fits your machine? Send the model and serial number to the parts desk before you order. Dykes Motors is an authorized Bobcat, LS Tractor, and Ferris dealer with genuine parts and service on site.

Price and availability checked Oct 18, 2026

$3.38

We accept Visa, Mastercard, American Express, Discover, Apple Pay, Google Pay, Amazon Pay, PayPal, Venmo, and Klarna.

In stock. Ships in 2 to 3 business days, arrives in 1 to 2 more — by Wed, Oct 28. Free shipping on every parts order. Free pickup at 3069 Hwy 49.

Genuine OEM part. Manufacturer warranty honored at our dealership.

Authorized Briggs and Stratton Dealer

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Fits these models

447 more models in the OEM parts diagram, unverified

Plus 387 more models. Text your model and serial number below and we confirm the exact fit.

Details

Briggs & Stratton NUT.31-18 NYLOCK ZINC (OEM part number 15X123MA). This is a nylon-insert lock nut used in engine assembly and fastening applications. This part is specific to certain Briggs & Stratton engines, so verify your equipment model or engine number against the fitment list before ordering to ensure compatibility.

Verify your fitment before you order

Text your equipment model and serial number to 601.516.7255 and we confirm the exact part before you pay. Prefer to talk? Call (601) 516-7255.

Questions about part 15X123MA

What machines does part 15X123MA fit?

We do not list a confirmed fitment for part 15X123MA on this page. Send the model and serial number of your machine to the parts desk and we will check it before you order.