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Seafirst Inboard Steering Cylinder Rams

Marine Tough Hydraulic Steering Cylinders
Seafirst Inboard Steering Cylinder
  • Industry-standard patterns made with 100% stainless, bronze, and brass construction
  • Cylinder rod made from non-magnetic SS pump shafting - hard chrome plated and ground
  • Over-sized SS ball joint w/ stainless inserts for smaller high-strength bolts for better clearance
  • Designed with 3/8" NPT ports for low-restriction fluid flow (125 C & 150 C / 1/4" NPT)
DOWNLOAD SEAFIRST CYLINDERS QUICK REFERENCE & SPECIFICATIONS CHART

How to Identify your Hynautic Marine Steering Hose Diameter
Image Model Bore
(nominal)
inch
Stroke
inch
Displacement
Volume
cubic inch
Typical Applications Purchase
Seafirst Inboard Steering Cylinder HC 125 B-7C

1 ¼ 7 6.5 EXACT Hynautic K-51 Fit with 30% less turns
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Seafirst Inboard Steering Cylinder HC 150 B-5

1 ½ 5 7.3 WAGNER N-40-120 or other short stroke Heavy Duty applications / Jet Boats
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Seafirst Inboard Steering Cylinder HC 150 B-7

1 ½ 7 10.2 Heavy Duty replacement for Teleflex/Seastar HC5318 / BA 150-7
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Seafirst Inboard Steering Cylinder HC 150 B-7C

1 ½ 7 11.4 EXACT Hynautic K-51 Fit
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Seafirst Inboard Steering Cylinder HC 150 B-9

1 ½ 9 13.1 Heavy Duty replacement for Hynautic K1-B, Teleflex HC 5369 / BA 150-9
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Seafirst Inboard Steering Cylinder HC 175 B-7C

1 ¾ 7 13.8 Compact HD 1.75" Bore cylinder-HD Replacement for Teleflex HC 5319 / BA175-7
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Image Model Bore
(nominal)
inch
Stroke
inch
Displacement
Volume
cubic inch
Typical Applications Purchase
Seafirst Inboard Steering Cylinder HC 200 B-7

2 7 16 Heavy Duty replacement for Teleflex / Seastar BA 200-7 or Jastram B 200-7
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Seafirst Inboard Steering Cylinder HC 200 B-9

2 9 20.5 Heavy Duty replacement for Hynautic K3-B, Teleflex / Seastar HC5802 or Jastram B 200-9
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Seafirst Inboard Steering Cylinder HC 200 B-11

2 11 25.1 Heavy Duty replacement for Teleflex BA 200-11, Jastram B 200-12 or upgrade for Hynautic K-31
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Seafirst Inboard Steering Cylinder HC 250 B-9

2 ½ 9 36.6 Heavy Duty replacement for Hynautic K4 or K8
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Seafirst Inboard Steering Cylinder HC 250 B-11

2 ½ 11 44.8 Heavy Duty Brass & Stainless replacement for Teleflex (steel HC 0328)
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Marine Tough Hydraulic Steering Cylinder Seal Kits
Image Model Description Purchase
Hydraulic Steering Cylinder Seal Kits SK 12 Seal kit for 1.25" bore cylinders
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Hydraulic Steering Cylinder Seal Kits SK 15 Seal kit for 1.5" bore cylinders
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Hydraulic Steering Cylinder Seal Kits SK 20 Seal kit for 2.0" bore cylinders
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Hydraulic Steering Cylinder Seal Kits SK 25 Seal kit for 2.5" bore cylinders
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