Most 2014 GMC Sierra lug nuts use a metric M14x1.5 thread with a 60-degree conical (acorn) seat. The 1500 models use six lug nuts, while the heavier 2500HD/3500HD models use eight lug nuts. The typical lug nut hex size is commonly 22 mm.
Model-specific lug nut sizing
The following outlines lug nut specs for the main 2014 Sierra configurations.
- 2014 Sierra 1500 (six-lug): Lug nuts use M14x1.5 thread with a 60-degree conical (acorn) seat. The standard lug nut hex size is typically 22 mm (7/8 in). Bolt pattern: 6x139.7 mm.
- 2014 Sierra 2500HD and 3500HD (eight-lug): Lug nuts use M14x1.5 thread with a 60-degree conical seat. The standard lug nut hex size is typically 22 mm. Bolt pattern: 8x165.1 mm.
Note: Variations can occur with aftermarket wheels or special packages. Always verify by counting lugs and checking the owner’s manual or wheel specifications for your exact vehicle configuration.
Installation and maintenance tips
When replacing lug nuts, use a torque wrench and tighten in a star pattern to the OEM specification. Re-torque after the first 50–100 miles and periodically thereafter. If you have aftermarket wheels, ensure the lug nuts match the seat type and thread size required by the wheels.
Summary
In summary, the 2014 GMC Sierra typically uses M14x1.5 lug nuts with a 60-degree conical seat. The 1500 models have six lugs (6x139.7 mm), while the HD models have eight lugs (8x165.1 mm). Always confirm the exact specifications for your vehicle based on VIN and wheel configuration.