Cusco Service WRENCH COIL OVER

Cusco's Fixed-Jaw Coilover Service Wrench for Adjusting Spring Perch and Lock Ring Height on Cusco Coilover Kits

The Cusco 00A 670 SK5 is the official Cusco service wrench for adjusting the spring perch and lower lock rings on Cusco coilover suspension kits. Designed by Cusco to fit the spanner ring notches on their coilover bodies, this fixed-jaw (non-adjustable) wrench delivers a secure, no-slip engagement that prevents rounding the aluminum lock rings during ride height adjustment or spring preload changes. Unlike generic spanner wrenches that require size adjustment and can slip under torque, the 00A 670 SK5 is machined to the exact engagement geometry of Cusco coilovers for reliable service use.

The wrench is compact enough to work in tight engine bay and wheel well clearances common on sport compact and performance vehicles. Whether you are setting initial ride height at installation, fine-tuning corner balance at the track, or performing periodic maintenance, the 00A 670 SK5 is the correct tool to protect your coilover investment. Sold individually as one wrench.

00A 670 SK5 Key Features

• Official Cusco service tool for adjusting spring perch and lock rings on Cusco coilover kits
• Fixed-jaw design machined to Cusco coilover spanner ring specifications
• Prevents rounding of aluminum lock rings during adjustment
• Compatible with Cusco Street Zero, Street Zero A, Sports Zero, Zero A, and other Cusco coilover series
• Compact profile for use in tight wheel well and engine bay spaces
• Sold individually (one wrench per listing)
• Made by Cusco, Japan

Specifications

What's Included

• 1 x Cusco 00A 670 SK5 Fixed-Jaw Coilover Service Wrench

Coilover kits and replacement components are sold separately.

Frequently Asked Questions

What does the Cusco 00A 670 SK5 wrench do?
The 00A 670 SK5 is a fixed spanner wrench used to turn the spring perch and lower lock ring on Cusco coilover suspension kits. Turning the spring perch raises or lowers the ride height; the lock ring is then tightened against the spring perch to secure the position. The 00A 670 SK5 engages the notches on the Cusco coilover aluminum rings for a secure grip without slipping.

What Cusco coilover kits is the 00A 670 SK5 compatible with?
The 00A 670 SK5 is designed for use with Cusco coilover kits that use the standard Cusco spanner ring notch pattern. This includes the Street Zero, Street Zero A, Sports Zero, Zero A, and most other current Cusco coilover series. If you are unsure whether this wrench fits your specific Cusco kit, contact Cusco or your Cusco dealer to confirm ring diameter and notch pattern before ordering.

Can I use the Cusco 00A 670 SK5 on non-Cusco coilovers?
The 00A 670 SK5 is specifically designed for Cusco coilover ring geometry. It may or may not physically fit other brands depending on ring diameter and notch size. Generic adjustable spanner wrenches are typically used for non-Cusco brands. Using an improperly sized wrench on aluminum coilover rings risks rounding the notches and damaging the coilover body.

Is the Cusco 00A 670 SK5 adjustable?
No. The 00A 670 SK5 is a fixed-jaw (non-adjustable) spanner wrench. The jaw width is set to the Cusco coilover specification and cannot be changed. Cusco also offers the adjustable C-spanner version for applications requiring variable jaw width.

How do I adjust ride height on my Cusco coilovers using the 00A 670 SK5?
First loosen the lower lock ring by turning it counter-clockwise with the 00A 670 SK5. Then turn the spring perch in the desired direction: counter-clockwise to lower the vehicle, clockwise to raise it. Once the desired height is set, re-engage the 00A 670 SK5 on the lock ring and turn clockwise until firm to lock the spring perch in position. Re-check ride height and corner balance after adjustment and retorque all suspension fasteners per the Cusco installation guide.

Will the Cusco 00A 670 SK5 damage my coilover lock rings?
No, when used correctly. The 00A 670 SK5 is designed to match the notch geometry of Cusco coilover rings, providing full engagement contact and distributing force evenly. The risk of ring damage comes from using improperly sized generic wrenches that only contact the notch edges under load.

Is the Cusco 00A 670 SK5 the same as an adjustable C-spanner?
No. Adjustable C-spanners have a movable pin that can be repositioned to different diameters. The 00A 670 SK5 is a fixed-jaw wrench with two prongs set to a specific engagement width for Cusco coilover rings. For coilovers from other manufacturers, an adjustable spanner may be more versatile.

Does the Cusco 00A 670 SK5 come with any warranty?
Cusco backs its service tools against manufacturing defects. As a precision-machined tool, the 00A 670 SK5 is built for long-term service use. Damage from misuse, such as using the wrench on incompatible ring sizes, is not covered under warranty.

Installation Instructions

To use the Cusco 00A 670 SK5, engage the two prongs of the wrench into the notches on the coilover lock ring or spring perch ring. Apply steady downward pressure to keep the prongs seated in the notches and rotate the wrench in the desired direction. Counter-clockwise loosens or lowers; clockwise tightens or raises, depending on which ring you are turning. Work in small increments and check vehicle height after each adjustment. Always retighten the lock ring firmly against the spring perch before driving. Verify all four corner heights with the vehicle loaded at ride height. Re-check fastener torque on the full suspension after the first 100 miles following any ride height change.