The typical factory setup for Chevy S10 pickups uses 12 mm diameter studs with a 1.5 mm thread pitch (M12x1.5) and lug nuts that are 19 mm across flats, with a 60-degree conical seat. However, wheel choices and model years can introduce variations, so it’s best to confirm for your exact vehicle.
Understanding the standard specs
Here are the specs that apply to most S10 models with factory wheels. These details cover the common configuration you’ll encounter on the road.
- Bolt pattern: 5 x 4.75 inches (5x114.3 mm)
- Wheel stud size: 12 mm diameter, 1.5 mm thread pitch (M12x1.5)
- Lug nut type: conical seat (60-degree)
- Lug nut hex size: typically 19 mm across flats
These specifications fit the majority of 1982–2004 S-10 pickups and many late-model S-10 variants with factory wheels. If you have aftermarket wheels, or a non-standard trim, sizes can differ.
How to verify the exact lug nut size for your S10
To ensure you get the correct lug nuts for your specific vehicle, follow these steps.
- Identify your exact year and model (e.g., S-10 pickup, Blazer, trim level) since minor year-to-year changes can occur.
- Check the owner's manual or a GM parts catalog for wheel hardware specifications for your year/model.
- Inspect an existing lug nut or the wheel itself: measure the hex size across flats with a caliper or ruler and confirm the seat type (conical vs. alternate) and thread on the studs (M12x1.5 is common).
- If you’re using aftermarket wheels, consult the wheel manufacturer or retailer to confirm the correct lug nut size, seat type, and length for those wheels.
- When in doubt, bring a sample lug nut or wheel/spec sheet to a tire shop or dealership parts counter to verify the exact size.
Accurate verification helps prevent cross-threading, wheel damage, or safety issues caused by using the wrong lug nuts.
Summary
For most Chevy S10 models, the standard lug nut setup is 12 mm diameter studs with 1.5 mm thread pitch (M12x1.5), 60-degree conical seat, and 19 mm across flats for the lug nuts, on a 5x4.75" bolt pattern. Variations can occur based on year, trim, and aftermarket wheels, so always confirm the exact spec for your vehicle by checking manuals, wheel manufacturer information, or a professional parts advisor.