APDTY 162420 is a brand-new pack of 60 M8x1.25mm hex head serrated lock nuts, zinc-plated for corrosion resistance, used on exhaust manifold studs for select GM 8.1L trucks and stabilizer end links on numerous GM cars and crossovers. It replaces GM number 12384973.
Key Takeaways
- What it is: a bulk pack of 60 M8x1.25mm serrated flange lock nuts.
- Two common uses: exhaust manifold stud nuts on GM 8.1L trucks, and stabilizer (sway bar) end-link nuts on numerous GM cars and crossovers.
- Finish: premium zinc plating to prevent corrosion.
- Fits: a wide range of GM applications — verify your specific thread and application below.
Buy APDTY 162420 directly from APDTY
What is a serrated hex head lock nut used for?
A serrated flange lock nut has small teeth under the flange that bite into the mating surface, helping resist loosening from vibration. APDTY 162420 is an M8x1.25mm metric coarse-thread version used in two common GM applications: exhaust manifold stud nuts on 8.1L trucks, and stabilizer bar end-link nuts on a wide range of GM passenger cars and crossovers.
What vehicles does APDTY 162420 fit?
For exhaust manifold studs, APDTY lists compatibility with 8.1L applications including:
- 2002–2006 Chevrolet Avalanche, Silverado 2500 HD/3500, Suburban 2500 (w/8.1L)
- 2002 Chevrolet C3500HD, Express 3500 (w/8.1L)
- 2001–2006 GMC Sierra 2500 HD/3500, Yukon XL 2500 (w/8.1L)
- 2002 GMC C3500HD, Savana 3500 (w/8.1L)
- 2007 Silverado/Sierra 2500 HD and 3500 Classic (w/8.1L)
For stabilizer end links, applications include select 2007–2023 Cadillac (ATS, CTS, XTS, ELR, CT4), Chevrolet (Camaro, Corvette, Sonic, Equinox, Malibu, Cobalt, Captiva Sport, Spark EV), GMC Terrain, Buick (Verano, LaCrosse), Pontiac G5, and Saturn (Sky, Vue). Always confirm your specific year, make, and model against the live APDTY compatibility chart before ordering.
APDTY 162420 specifications at a glance
| Specification | APDTY 162420 |
|---|---|
| Part type | Hex head serrated lock nut |
| Thread | M8x1.25mm metric coarse |
| Pack size | 60 nuts |
| Finish | Premium zinc plated |
| Replaces | 12384973 |
| Common uses | Exhaust manifold studs (8.1L); stabilizer end links (various GM) |
How do you install a serrated lock nut?
This is a general overview only.
- Confirm the thread size and application match your specific stud or bolt.
- Clean the threads before installing the new nut.
- Torque to the manufacturer's specification for the specific application — exhaust manifold and suspension fasteners have different torque values.
- Verify the connection is secure and does not loosen under normal operation.
Frequently asked questions
What does APDTY 162420 replace?
It replaces GM lock nut number 12384973 on compatible exhaust manifold and stabilizer end-link applications.
How many nuts come in a pack?
60 nuts per pack.
What thread size is this?
M8x1.25mm metric coarse thread.
Stock up on GM serrated lock nuts
APDTY 162420 gives DIY owners and shops a bulk supply of the correct M8x1.25mm serrated lock nut for common GM exhaust manifold and stabilizer applications. Verify your specific vehicle before ordering.