HKS 1.1 kg N-Type Radiator Cap - 2013-2016 Scion FR-S / 2013-2024 Subaru BRZ / 2017-2024 Toyota GR86 / 1993-1998 Toyota Supra

1.1 kg N-Type Radiator Cap for FR-S, BRZ, GR86, and Supra

The HKS 1.1 kg N-Type Radiator Cap provides a 1.1 bar (approximately 16 psi) pressure cap for a broad range of applications including the 2013-2016 Scion FR-S, 2013-2024 Subaru BRZ, 2017-2024 Toyota GR86, and 1993-1998 Toyota Supra. The N-Type designation refers to the cap's connector style. Verify your upper radiator hose and overflow system use the N-Type connection before ordering.

Specs & Highlights

• 1.1 kg / 1.1 bar / approximately 16 psi pressure rating
• N-Type cap connector style
• Raises coolant boiling point
• Precision pressure relief valve
• Fitment: 2013-2016 FR-S / 2013-2024 BRZ / 2017-2024 GR86 / 1993-1998 Supra

1.1 Bar, ±0.05 Bar Tolerance, 52mm N-Type Neck

The N-Type designation refers to the narrower 52mm filler neck diameter used on the FA20-series BRZ/GR86 applications and the A70/A80 Supra platform, as opposed to the wider 69mm neck on WRX/STI models. The 1.1 bar pressure rating and ±0.05 bar tolerance valve specification are identical to the AK004. The N-Type cap uses a different lower seal diameter, 52mm versus 69mm, meaning the two cap versions are not interchangeable despite having the same pressure rating.

N-Type vs Wide-Neck: Not Interchangeable

Higher cap pressure means a higher boiling point for the coolant. A meaningful benefit for any high-load driving situation. The precision pressure valve in the HKS cap maintains consistent pressure across operating conditions.

Same Pressure Rating as AK004, Different Connector

Verify your cap connector type, the N-Type may not be interchangeable with all radiator neck configurations on the listed vehicles. Check your current cap's connector style before ordering. If your application uses a different connector type, refer to the HKS AK004 cap.

The FT Breakdown

The radiator cap is the minimal-cost cooling system upgrade with real engineering behind it. The HKS N-Type cap provides the correct pressure and precision valve for applications where the factory cap specification is adequate for the street but you want additional margin for performance use. The 52mm N-Type neck versus the 69mm wide neck on the AK004 is the detail that makes ordering the wrong cap an installation problem rather than just a mismatch. On the FA20 and A70/A80 Supra applications where the narrow neck is specified, the wide-neck cap physically cannot be installed — but the reverse is also true, and forcing a narrow cap into a wide neck risks neck damage. Verify before ordering.