Description
New SeaStar Solutions HK6400A-3 SeaStar hydraulic outboard steering system with SeaStar HO5118 18ft hose kit (kit part number HK6318A-3).
Features
- 5 Turns Lock-to-Lock (1.7 cu. in. displacement helm)
- Standard 3/4″ Tapered Keyed Steering Shaft (threaded end of steering shaft is 5/8″-18UNF)
- Patented No FeedBack™ (NFB) Lock Valves
- Replaces and Supersedes Teleflex Marine SeaStar HK6400A and HK6400
- Exceeds NMMA and ABYC Standards
Works ForBoats up to 60 mph with single outboards up to 300 HP or twin outboards up to 450 hp (non-counter rotating) / 600 hp (counter rotating). Twin engine applications require a tie bar kit. High performance boats, top speeds above 60 mph, fast bass boat, or boats with dual-cable steering will require the SeaStar Pro kit. The SeaStar requires a 3″ (76mm) cut-out hole in the dash and a minimum 21″ (534mm) splashwell width.
Cylinder/RamThe HC5345-3 cylinder is suitable for most outboards. Use the application guide in the product images to double-check what cylinder your outboard requires. If you need a cylinder other than the HC5345-3, find the SeaStar kit that comes with it here: HC5347-3, HC5348-3, or HC5358-3. If your outboards needs the HO5090 spacer kit, you can find it here.
HosesThis SeaStar kit comes with a 18 foot hose kit, part number HO5118. If you’re unsure what length you need, use the measuring guide in the product images. For different lengths go here.
| Part Number | Qty | |
|---|---|---|
| Helm | HH5271-3 | 1 |
| Cylinder | HC5345-3 | 1 |
| Hose Kit | HO5118 (18ft) | 1 |
| Fluid/Oil | HA5430H | 2 quarts |
| Filler Kit | HA5438 | 1 |
| Instructions | 1 |
For the tilt helm SeaStar kit, go here.



![Jabsco HotShot HD4 Heavy Duty Washdown Pump – 24V – 4 GPM – 60 PSI [Q402J-118N-3A]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/jabsco-hotshot-hd4-heavy-duty-washdown-pump-24v-4-gpm-60-psi-q402j-118n-3a.webp)
![Blue Sea 7605 BatteryLink Charger – 10Amp – 2-Bank[7605]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-7605-batterylink-charger-10amp-2-bank-7605.webp)
![Rapala Combo Pack – Pliers, Clipper, PunchSharpener [RTC-6PCHS]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/rapala-combo-pack-pliers-clipper-punchsharpener-rtc-6pchs.webp)
![Blue Sea 7542 C-Series Flat Rocker Circuit Breaker – Single Pole – 15A [7542]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/blue-sea-7542-c-series-flat-rocker-circuit-breaker-single-pole-15a-7542.webp)
![Jabsco Mag Drive Centrifugal Pump – 14GPM – 110V AC[436979]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/jabsco-mag-drive-centrifugal-pump-14gpm-110v-ac-436979.webp)
![Ocean Signal RescueME EDF1 Electronic Distress Flare – 7 Mile Range[750S-01710]](https://www.durablemarinebattery.com/wp-content/uploads/2026/08/ocean-signal-rescueme-edf1-electronic-distress-flare-7-mile-range-750s-01710.webp)
