Project Kics Kyokugen Heptagon 42mm Closed-End Lug Nuts (AE86 & AW11)
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Project Kics Kyokugen Heptagon 42mm Closed-End Lug Nut Set
For 1983–1987 Toyota AE86 & 1984–1989 Toyota MR2 AW11 with M12 x 1.5 Wheel Studs and Aftermarket 60° Conical-Seat Wheels
Overview
The Project Kics Kyokugen Heptagon Lug Nut Set is a forged chromoly-steel wheel-hardware upgrade for Toyota AE86 and first-generation MR2 AW11 applications using M12 x 1.5 wheel studs and aftermarket wheels with 60° conical lug seats.
Each nut uses Project Kics' distinctive seven-sided heptagon profile and requires the supplied matching adapter for installation and removal. The 42 mm closed-end design provides an extended tuner-style appearance while covering the end of the wheel stud.
The set contains 20 lug nuts plus the dedicated heptagon adapter. Both the AE86 and AW11 use four-lug wheel configurations requiring 16 lug nuts for a complete vehicle, leaving four additional nuts as spares.
Key Features
- M12 x 1.5 thread size for supported Toyota AE86 and MR2 AW11 wheel studs
- Forged SCM435 chromoly-steel construction
- 42 mm overall length
- Seven-sided heptagon profile requiring the supplied dedicated adapter
- 60° conical / tapered seat for appropriate aftermarket wheels
- Closed-end construction covers the exposed end of the wheel stud
- Compact tuner-style profile suitable for many aftermarket wheel designs
- Black finish
- 20-piece set provides four spare lug nuts on a standard four-lug AE86 or AW11
- Dedicated heptagon installation/removal adapter included
Heptagon Design & Wheel Compatibility
The Kyokugen design replaces a conventional six-sided hex profile with a seven-sided heptagon shape. A normal hex socket cannot properly engage the nut, so the supplied Project Kics adapter is required for installation and removal.
This design provides an additional level of removal deterrence compared with conventional hex lug nuts, although it should not be considered a dedicated locking-lug system.
Wheel-seat design is critical. These lug nuts use a 60° conical seat and are intended for aftermarket wheels designed for tapered-seat lug hardware. Matching the M12 x 1.5 thread alone does not guarantee proper wheel compatibility.
Vehicle Fitment
Toyota Corolla Levin
- 1983–1987 Toyota Corolla Levin – Corolla Family – AE86 – M12 x 1.5 wheel studs – aftermarket 60° conical-seat wheels
Toyota Sprinter Trueno
- 1983–1987 Toyota Sprinter Trueno – Corolla Family – AE86 – M12 x 1.5 wheel studs – aftermarket 60° conical-seat wheels
Toyota Corolla Sport SR5
- 1984–1987 Toyota Corolla Sport SR5 – Corolla Family – AE86 – M12 x 1.5 wheel studs – aftermarket 60° conical-seat wheels
Toyota Corolla Sport GT-S
- 1985–1987 Toyota Corolla Sport GT-S – Corolla Family – AE86 – M12 x 1.5 wheel studs – aftermarket 60° conical-seat wheels
Toyota MR2 AW11
- 1984–1989 Toyota MR2 AW11 – W10 / AW11 – M12 x 1.5 wheel studs – aftermarket 60° conical-seat wheels
- North American AW11 model-year coverage is 1985–1989
Fitment Notes
- For aftermarket wheels using a 60° conical / tapered lug seat only.
- Do not use with factory wheels that require a different lug-seat design.
- Does not fit wheels requiring inverted, reverse-style, ball-seat, flat-seat, or other non-60° conical lug hardware.
- AE86 models use a 4x114.3 wheel bolt pattern and require 16 lug nuts per vehicle.
- MR2 AW11 models use a 4x100 wheel bolt pattern and require 16 lug nuts per vehicle.
- Wheel bolt pattern does not determine lug-nut thread compatibility; both applications use M12 x 1.5 wheel studs.
- The 20-piece set provides four spare lug nuts when installed on a standard four-lug AE86 or AW11.
- Verify adequate internal clearance when using extended wheel studs. The stud must not bottom out inside the closed-end lug nut before the wheel is properly clamped.
- Confirm the aftermarket wheel manufacturer's required lug-seat profile before installation.
- Follow the wheel or vehicle manufacturer's specified tightening procedure and torque specification.
- The supplied heptagon adapter is required for installation and removal.
Product Specifications
Brand: Project Kics
Series: Kyokugen Heptagon
Product Type: Wheel Lug Nut Set
Thread Size: M12 x 1.5
Seat Type: 60° Conical / Tapered
Overall Length: 42 mm
Material: Forged SCM435 Chromoly Steel
Design: Seven-Sided Heptagon
End Type: Closed End
Color: Black
Quantity: 20 Lug Nuts
Installation Tool: Dedicated Heptagon Adapter Included
Wheel Application: Aftermarket Wheels with 60° Conical Lug Seats
Vehicle Lug Configuration: Four-Lug Applications
Lug Nuts Required per AE86 / AW11: 16
What's Included
- (20) Project Kics Kyokugen Heptagon 42 mm Closed-End Lug Nuts
- (1) Dedicated Heptagon Adapter