HOME > STEERING & RUDDERS > ADD-ON STEERING SYSTEMS
Sterndrive Hydraulic Cylinders
 
HYDRAULIC CYLINDERS or sometimes called rams are the primary consideration in hydraulic steering systems as they are where the action is! All the hydraulic force of the system is converted to linear motion as the cylinder extends and retracts, moving the sterndrive or outboard. At Latham Marine, we produce high quality, rugged stainless steel thick wall cylinders with incredibly smooth bores using computer controlled precision manufacturing techniques, proven by years of offshore victories and trouble free operation. All cylinders are pressure tested before shipping, to assure you of dependable, trouble free operation.
 
 
THE STERNDRIVE CYLINDER
THE STERNDRIVE CYLINDER is equipped with a stainless steel transom mount and integral clevis joint which allows pivoting action in two planes. Fluid ports are 1/4" NPT and four standard stroke lengths are available, with a choice of polished or white powder coat transom mounts. All part numbers are for one cylinder and mount assembly. Some applications require multiple cylinders - consult your sales specialist.
STERNDRIVE CYLINDER PART NUMBERS
STROKE
STANDARD
CLEVIS JOINT / POLISHED MOUNT
MEDIUM
CLEVIS JOINT /
POLISHED MOUNT
7"
KRSD-9384
KRSD-9388
8"
KRSD-9385
KRSD-9389
9"
KRSD-9386
KRSD-9390
10"
KRSD-9387
KRSD-9391
STROKE
STANDARD
CLEVIS JOINT /
WHITE MOUNT
MEDIUM
CLEVIS JOINT / WHITE MOUNT
7"
KRSD-9508
KRSD-9512
8"
KRSD-9509
KRSD-9513
9"
KRSD-9510
KRSD-9514
10"
KRSD-9511
KRSD-9515
 
 
 
  Return to Top of Page  
Sterndrive Mounting Plates
 
MANY PERFORMANCE STERNDRIVE INSTALLATIONS require special mounting plates and brackets to connect external steering and tie bars. All LATHAM sterndrive plates are made from 316 stainless, computer machined for accurate fit, and polished for long lasting beauty. Attaching hardware is included unless otherwise noted.
 
 
ALPHA® MOUNT
The original MCM I drive has been revised several times; first as the Alpha Drive and now the Generation II. All kits include mounting bolts and spacers.
PLSD-2773     ALPHA, STEERING/TIE BAR PLATE
PLSD-8517     GENERATION II TIE BAR PLATE
PLSD-8518      GENERATION II STEERING AND TIE BAR PLATE
 
 
 
 
BRAVO® MOUNT
MerCruiser's Bravo drive has been the standard on virtually every brand of performance boat for almost two decades. The Bravo drive is also available in the Bravo One X® and XR® models for higher power applications and requires a different steering mount. The LATHAM BRAVO BOLT-ON STEERING MOUNTS are bolted directed onto the stock drive requiring no removal of the stock rear cover or drainage of the drive oil. Mounting studs and lock nuts are included for increased strength.
KPLT-7905 MCM BRAVO BOLT-ON MOUNT - 2005+
KPLT-7914 MCM BRAVO X/XR BOLT-ON MOUNT- 2005+
KPLT-7627 MCM BRAVO BOLT-ON MOUNT - PRE 2005
KPLT-7069 MCM BRAVO CENTER TOP PLATE
KPLT-7070 MCM BRAVO CENTER TOP PLATE - REV. ANGLE BRKT.
         
KPLT-7071 MCM BRAVO X/XR CEN. PLATE - REV. ANGLE BRKT.
KPLT-7409 MCM BRAVO / STELLINGS PLATE - 8" RH
KPLT-7410 MCM BRAVO / STELLINGS PLATE - 9" RH
KPLT-7418 MCM BRAVO / STELLINGS PLATE - 8" LH
KPLT-7419 MCM BRAVO / STELLINGS PLATE - 9" LH
 
 
 
 
TRS® REAR MOUNT
The TRS drive brought offshore powerboating to the masses in the 1970's. This tough sterndrive is still on a lot of transoms, and still going fast! LATHAM'S TRS REAR MOUNT attaches over the stock rear cover on studs (studs and lock nuts are included). Fits stock TRS, TR2, and TRS Speedmaster and allows attachment of rams and/or clevis tie bars.
PLSD-2150     MCM TRS REAR MOUNT
 
 
 
 
MCM III®, IV® and V® WING AND WRAP PLATES
These drives have been used successfully in offshore racing since the '60's. Speedmaster became a familiar term if you wanted to stay competitive. All these drive variations share the same bolt pattern for attaching plates to the Merc rear steering cover. The correct combination of plates is primarily determined by application; i.e. hull type, racing or pleasure, etc. Special wing plates are required for drives on extension boxes, and the cylinders must have medium clevis joints. Call your sales consultant for details.
PLSD-2190     WRAP-AROUND PLATE, CENTER
PLSD-2200      WRAP-AROUND PLATE, OUTSIDE
PLSD-2210     ONE WING WRAP-AROUND PLATE
 
 
 
 
TIE BAR PLATES
TIE BAR PLATES for IV and V drives bolt to back of driveshaft housing above rear anchor pin. Mounting studs and lock nuts are included (machining of housing is required).
PLSD-2240      MCM V TIE BAR PLATE FOR LRG. CLEVIS
 
 
 
 
MERCRUISER VI® & 6A® TIE BAR MOUNTS
MERCRUISER VI® & 6A® TIE BAR MOUNTS provide solid mounting points for a clevis tie bar. Built of 316 stainless steel, they attach to the four studs built into the VI drive, or to the top of the 6A drive. Bolt kits to attach tie bar clevis joints to mounts are included.
KPLT-7139 MCM 6A MOUNT, LRG. CLVS, EAR BELOW
KPLT-7661 MCM 6A MOUNT, LRG. CLVS, EAR ABOVE
KPLT-8575 MCM 6A MOUNT, XLG. CLVS, EAR ABOVE
PLSD-9100 MCM VI MOUNT FOR VEE HULLS
PLSD-8507 MCM VI MOUNT FOR CATAMARANS
 
 
 
 
KONRAD 540 HP STERNDRIVE® STEERING / TIE BAR PLATE
KONRAD 540 HP STERNDRIVE® STEERING / TIE BAR PLATE is designed to bolt directly to the 4 bolt holes on the rear cover without any modification to the drive. It is a universal design allowing attachment of either single or dual rams and a tie bar attaching hole on the drive center allowing smooth synchronization of multiple drives.
KPLT-7974      KONRAD DRIVE STEERING MOUNT KIT
 
 
 
  Mercruiser Alpha, Bravo One, Bravo One XR, Bravo One XZ,TRS, III, IV, V, VI & 6A are all registered trademarks of the Brunswick Corporation. Konrad 540 HP Sterndrive is a registered trademark of Konrad Marine.  
 
 
  Return to Top of Page  
Sterndrive Tie Bars Assemblies
 
ALL MULTIPLE DRIVE INSTALLATIONS require one or more tie bars to keep the drives parallel and equalize loading. Boats running 65 mph or more with multiple sterndrives should use an external tie bar assembly; either in addition to an internal tie bar or by itself, if used in conjunction with Latham external steering. Using only an external clevis bar will allow the driver greater latitude for independent trimming and tilting without damage to tie bar or drive components. The same principles apply to outboards with front and rear tie bars.

LATHAM MARINE INC. TIE BARS are constructed from 316 stainless steel and satin finished for maximum corrosion resistance. Solid bars are used up to 36" long. And tubular construction is utilized for longer bars.
 
 
CLEVIS JOINT BARS
CLEVIS JOINT BARS are available with four sizes of clevis joints in solid or tubular bars. Special bolt kits MUST be used with clevis joints.
CLEVIS JOINT BARS
TBAR-4560 1-1/8" BAR WITH STANDARD CLEVIS
TBAR-4570 1-1/8" BAR WITH MEDIUM CLEVIS JOINTS
TBAR-4490 1-1/4" BAR WITH LARGE CLEVIS JOINTS
TBAR-8508 1-1/4" BAR WITH LARGE SCISSORS CLEVIS
 
TUBULAR BARS
TBAR-4730 1-3/8" BAR WITH MEDIUM CLEVIS JOINTS
TBAR-4770 1-5/8" BAR WITH MEDIUM CLEVIS JOINTS
TBAR-4780 1-5/8" BAR WITH LARGE CLEVIS JOINTS
TBAR-4280 2" SUPER BAR WITH X-LARGE CLEVIS JOINTS
 
CLEVIS JOINT TIE BAR ASSEMBLIES
KTBR-8485 MCM I®/ ALPHA® ASSEMBLY W/STANDARD CLEVIS
KTBR-8581 ALPHA GENERATION II® ASSEMBLY W/STD. CLEVIS
KTBR-4702 BRAVO® ASSEMBLY With Standard Clevis
KTBR-1585 TRS® ASSEMBLY WITH STANDARD CLEVIS
KTBR-4662 TRS HD® ASSEMBLY WITH STANDARD CLEVIS
         
KTBR-8453 MCM III® ASSEMBLY WITH LARGE CLEVIS *
KTBR-8454 MCM IIIA® ASSEMBLY WITH LARGE CLEVIS *
KTBR-4870 MCM VI® TIE BAR KIT FOR VEE HULLS - LARGE CLEVIS
KTBR-4880 MCM VI® TIE BAR KIT FOR CATS - X-LARGE CLEVIS
KTBR-4970 MCM 6A® TIE BAR KIT - VEE - EAR ABOVE - LRG CLEVIS
         
KTBR-4975 MCM 6A® TIE BAR KIT - VEE - EAR BELOW - LRG CLEVIS
KTBR-4980 MCM 6A® TIE BAR KIT - CAT - X-LARGE CLEVIS
KTBR-7415 VOLVO SX®/DPS® ASSEMBLY WITH STANDARD CLEVIS
KTBR-7438 VOLVO DPX® ASSEMBLY WITH STANDARD CLEVIS
 
* Long Anchor Pins Required
ROD END TIE BAR ASSEMBLIES
KTBR-4601 MCM I® ASSEMBLY WITH 1/2" AHT ROD ENDS
KTBR-4610 MCM I® ASSEMBLY WITH 5/8" AHT ROD ENDS
KTBR-4700 BRAVO® ASSEMBLY WITH 3/4"AHT ROD ENDS
   
 
 
 
 
TIE BAR SADDLES
TIE BAR SADDLES can be purchased separately as replacement items. All tie bar saddles are made from 316 stainless and mirror polished, and can be ordered for rod ends or clevis joints. Heavy duty saddles for MCM TRS, III, IV and V drives require long anchor pins (sold separately). IV & V drives cannot use saddles with 1" drive spacers.
SADL-4800 MCM I SADDLE FOR 1/2" ROD END
SADL-4820 MCM I SADDLE FOR 5/8" ROD END
SADL-8353 MCM I SADDLE FOR STANDARD CLEVIS
SADL-4860 BRAVO SADDLE FOR 3/4" ROD END
SADL-1540 BRAVO SADDLE FOR STANDARD CLEVIS
         
SADL-1543 BRAVO SADDLE FOR STD. CLEVIS W /SPACER - '05+
SADL-4810 TRS SADDLE FOR 3/4" ROD END
SADL-4282 TRS HD SADDLE FOR 3/4" ROD END*
SADL-1550 TRS SADDLE FOR STANDARD CLEVIS
SADL-4283 MCM III SADDLE FOR 3/4" ROD END*
         
SADL-4286 MCM III SADDLE FOR LARGE CLEVIS*
SADL-4290 MCM IIIA SADDLE FOR LARGE CLEVIS*
SADL-2260 MCM IV SADDLE FOR LARGE CLEVIS*
SADL-7415 VOLVO SX/DPS SADDLE FOR STANDARD CLEVIS
PINS-3318 TRS LONG ANCHOR PIN
         
PINS-3320 MCM III LONG ANCHOR PIN
PINS-3321 MCM IIIA LONG ANCHOR PIN
     
WARNING: WHEN USING TIE BARS, DRIVES MUST BE TRIMMED AND TILTED TOGETHER TO AVOID DAMAGE TO TIE BARS OR DRIVES
 
 
 
 
LATHAM MARINE CLEVIS JOINTS
LATHAM MARINE CLEVIS JOINTS allow sterndrives or outboards to be trimmed and tilted independently to a much greater extent than typical spherical rod ends. Constructed of stainless steel to exacting tolerances, clevis joints must be used with special bolt kits to provide the proper fit on the clevis poly bushings. Four sizes of male clevis joints are available depending on duty level, and clevis joints are supplied as an integral part of the steering cylinders. Scissors clevis joints are used on triple applications where two tie bars meet at a center point, and allow both bars to attach right on the drive's centerline.
CLVS-1075 STANDARD, MALE 3/4-16 THREADS
CLVS-1076 STANDARD, FEMALE 5/8-18 THREADS
CLVS-1077 MEDIUM, MALE 3/4-16 THREADS
CLVS-1078 MEDIUM, FEMALE 5/8-18 THREADS
CLVS-1079 LARGE, MALE 7/8-14 THREADS
         
CLVS-1080 X-LARGE, MALE 1-1/4-12 THREADS
CLVS-4999 MEDIUM SCISSORS CLEVIS
CLVS-5000 LARGE SCISSORS CLEVIS
   
WARNING: WHEN USING TIE BARS, DRIVES MUST BE TRIMMED AND TILTED TOGETHER TO AVOID DAMAGE TO TIE BARS OR DRIVES
 
 
 
 
LATHAM MARINE RODE ENDS
LATHAM MARINE stocks a large supply of stainless steel, Teflon lined spherical rod ends. These are available in standard AHT SERIES or heavy duty ART SERIES, and are made from several different grades of stainless. Thread size and hole size are the same, and all threads are National Fine Thread.
STANDARD SERIES
RDEN-6010 AHFT3 10-32 FEMALE RH 303
RDEN-6011 AHMT6 3/8-24 MALE RH 303
RDEN-6021 AHMT8 1/2-20 MALE RH 316
RDEN-6022 AHMTL8 1/2-20 MALE LH 316
RDEN-6015 AHMT10 5/8-18 MALE RH 303
         
RDEN-6016 AHMTL10 5/8-18 MALE LH 303
RDEN-6026 AHFT10 5/8-18 FEMALE RH 316
RDEN-6018 AHMT12 3/4-16 MALE RH 303
RDEN-6019 AHMTL12 3/4-16 MALE LH 303
RDEN-6020 AHFT12 3/4-16 FEMALE RH 303
ART SERIES - HEAVY DUTY
RDEN-6030 ART6-ECR 3/8-24 MALE RH 17-4PH
RDEN-6008 ART8-ECR 1/2-20 MALE RH 316
RDEN-6033 ART10-ECR 5/8-18 MALE RH 17-4PH
RDEN-8416 ARTL10-ECR 5/8-18 MALE LH 17-4PH
RDEN-6032 ART10CR 5/8-18 FEMALE RH 17-4PH
         
RDEN-6034 ART12-ECR 3/4-16 MALE RH 17-4PH
RDEN-6037 ARTL12-ECR 3/4-16 MALE LH 17-4PH
     
* PLEASE NOTE: Jam nuts sold separately.
 
 
 
  Mercruiser MCM I, Alpha, Alpha Generation II, Bravo One, Bravo One XR, Bravo One XZ,TRS, III, IV, V, VI & 6A are all registered trademarks of the Brunswick Corporation. Volvo SX, DPS and DPX are all registered trademark of Volvo Penta of the Americas, Inc.  
 
 
  Return to Top of Page  
Sterndrive Bolt Kits
 
 
ATTACHING HARWARE
ATTACHING HARWARE - All steering rams and tie bars require special bolts and spacers to attach them to plates or mounts. Clevis joints require stepped bolts with the exact length to prevent damage to the clevis bushings.
KBLT-1035 BOLT KIT: 5/8" X 2-3/4" - LINK TO TRANSOM MOUNT
KBLT-1036 BOLT KIT: 5/8" X 3" - RAM TO LINK
KBLT-1523
BOLT KIT: 3/8" X 3-3/4" - Sterndrive Ram Mount Through Transom
KBLT-2750 BOLT KIT: STANDARD CLEVIS BETWEEN EARS
KBLT-2751 BOLT KIT: STANDARD CLEVIS ABOVE EAR, NO RAM
         
KBLT-2752 BOLT KIT: MEDIUM CLEVIS ABOVE EAR, NO RAM
KBLT-2757
BOLT KIT: STANDARD CLEVIS BELOW EAR, NO RAM
KBLT-2758 BOLT KIT: MED./LRG. CLEVIS BELOW EAR
KBLT-2760
BOLT KIT: Std. Clevis Below Ears And Rod End To Bravo / Trs Mount
KBLT-2763
BOLT KIT: STANDARD CLEVIS TO 3/8" PLATE
         
KBLT-2767
Bolt Kit: Standard Clevis Below And Between
Ears On Bravo/Trs Mount.
KBLT-2768 BOLT KIT: MED./LRG. CLEVIS ABOVE EARS, STANDARD CLEVIS BETWEEN EARS.
KBLT-2770 BOLT KIT: MED./LRG. CLEVIS BELOW, STD.CLEVIS BETWEEN EARS.
KBLT-2893 BOLT KIT: LARGE CLEVIS TO MERC #6 MOUNT
KBLT-1456 BOLT KIT: X-LARGE CLEVIS TO 6-A TOP MOUNT PLT.
         
KBLT-6030 BOLT KIT: 1/2" X 4" - RAM TO MCM III,IV & V DRIVE
KBLT-6310
BOLT KIT: 1/2" X 4" - WRAP PLATE TO MCM III,IV & V
KBLT-7689
BOLT KIT: MED./LRG. CLEVIS BRAVO XR, BET. EARS
KBLT-7776 BOLT KIT: STANDARD CLEVIS BETWEEN AND BELOW EAR ON B-MAX MOUNT.
KBLT-7438
BOLT KIT: STD. CLEVIS TO VOLVO DPX - TIE BAR
         
KBLT-7866 BOLT KIT: LINK TO TRANSOM MOUNT
KBLT-7867 BOLT KIT: RAM TO LINK
KBLT-8502
BOLT KIT: MEDIUM CLEVIS TO WING PLATE
KBLT-8700
Bolt Kit: Medium Clevis To Bravo /Stellings Top Plate W/Ear.
 
 
 
 
  Return to Top of Page  
Mercury Controller Valve
 
 
LATHAM ADD-ON STEERING SYSTEMS
LATHAM ADD-ON STEERING SYSTEMS are a good compromise between and an economical steering system for boats with Mercruiser® sterndrives with factory power steering and the high quality and durability associated with the Latham Full Power Systems. The stock steering cable and helm diverts the hydraulic flow through the Mercury® controller valve on the inner transom plate to the Latham external hydraulic cylinders. These systems include the same steering cylinders, mounting brackets, tie bars and attaching hardware as in the full power systems. Steering effort is low, but there is no valve to lock out propeller torque and the system is not as responsive as the full power system. The stock Mercury® controller valve requires modification by Latham Marine to be used in the ADD-ON configuration.
 
 
 
 
LABR-2000 MODIFICATION TO CONTROLLER VALVE
LABR-2000 MODIFICATION TO CONTROLLER VALVE

 
 
 
  Mercruiser and Mercury are registered trademarks of the Brunswick Corporation.  
     
 

 
 
I
I
© Latham Marine Inc.
I