For a 1987 Nissan D21 Hardbody pickup, the factory lug nuts typically use 12 mm diameter studs with a 1.25 thread pitch and a 21 mm hex (3/4 inch). The wheel bolt pattern is 6x5.5 inches (139.7 mm), and the seat type is a 60-degree conical (tapered) design. The standard torque is around 100 ft-lbs, but always verify with the factory manual or the wheel manufacturer, especially if aftermarket wheels or adapters are involved.
Lug Nut Specifications
The following details reflect the typical factory configuration for most 1987 D21 Hardbody trucks. Note that aftermarket wheels can change these specs, so always confirm before purchasing replacements.
- Bolt pattern: 6 on 5.5 inches (139.7 mm)
- Stud diameter: 12 mm
- Thread pitch: commonly 1.25 (some early examples may be 1.5; verify)
- Hex size (nut width across flats): 21 mm (3/4 inch)
- Seat type: 60-degree conical (acorn) seating
- Number of lug nuts per wheel: 6
Because aftermarket wheels or spacers can alter lug nut requirements, always confirm the exact size and seat type for your specific setup.
How to Confirm Your Exact Size
To ensure you’re using the correct lug nuts for your D21, especially after wheel changes or upgrades, follow these steps:
- Inspect the current lug nuts or wheel studs to identify the thread pitch and diameter. If uncertain, bring a lug nut or a ruler to a parts store for comparison.
- Measure the hex size across flats of the lug nut with a caliper or ruler to determine whether you need 21 mm or another size.
- Verify the seat type on the lug nut matches the wheel seat (most D21 factory wheels use a 60-degree conical seat).
- Confirm the bolt pattern is 6x5.5 inches (139.7 mm) to ensure wheel compatibility.
- Check the factory service manual or the wheel manufacturer’s specifications for the exact torque specification, and tighten with a calibrated torque wrench to that value.
In practice, sticking to the factory specs and using the correct hex size and seat type will help ensure safe wheel mounting on the D21.
Notes on Upgrades and Variations
If you’ve swapped to aftermarket wheels or a different hub/adapter setup, lug nut specs may differ. Always verify compatibility for the specific wheel-tire combination you’re using.
Summary
The 1987 Nissan D21 Hardbody typically uses 12 mm diameter studs with a 1.25 (commonly; some examples may be 1.5) thread pitch, 21 mm lug nut hex size, and a 60-degree conical seat to fit a 6x5.5" bolt pattern. Verify exact specs on your vehicle, particularly when changing wheels or tires, and torque to the recommended specification from the manual or wheel manufacturer.