Lug Nut Torque Specifications for a Sierra 1500by Martin Woodfield
Developed and manufactured by GM, the Sierra is the GMC-brand twin of Chevrolet's Silverado 1500 truck. GM trucks have been in production since 1918, but it was not until 1999 that either model received a formal name when the 1500 models adopted their trim option names of Sierra and Silverado. Wheel specifications for the 1500 series vary greatly from trim to trim, but many of the wheel aspects, including lug nut torque specs, are identical throughout.
Lug Nut Torque
Sierra lug nuts require 140 feet-pounds of torque to properly tighten them and hold the wheel in place.
Lug Pattern and Bore Hole
Sierra models from 1999 and beyond have lug bolt patterns of six 14-mm by 1.5-inch lug nuts over a 139.7 mm diameter. Centering the wheel on the hub is a 78.3-mm center bore hole.
Recent Sierra 1500 models are available with various wheels, based on trim option. Wheel options include 17-inch styled steel, 17-inch polished alloy, 17-inch painted steel, 18-inch alloy and 20-inch chrome alloy. All Sierra models are sold with a full-size steel spare wheel of matching size.