“Quality materials make it strong... Our designs make it better.”

COMPANY HISTORY & INTRODUCTION Thank you for taking the time to look at our company as a supplier of parts for your boating needs. We started Marine Hardware Inc. in 1979. Growing up around boating as a kid and working for a few of our new local Seattle boat builders, John Pugh saw the need to manufacture shafts, struts and rudders specifically designed to fit the “new fiberglass” boats coming to the marketplace. Traditional suppliers for running gear had a long history of making parts for wood boats and were slow to re-design parts to fit these new fiberglass boats. In 1979, Marine Hardware...

46-57 SERVICE PARTS WORKSHEETS 48-49 Inboard Rudder-Ski Boat 53 Flat Based Strut 54 Angle Based Strut 56 Direct Drive In-Line Coupler 57 V-Drive with Reverse Coupler 7 Shaft Strength & Alloy Analysis 11 Correct Fit of Propeller/Coupler on Shaft 12-14 Couplers 16 Cotter Pins 16-17 Prop Nuts 18 Coupler Removal Tool 20 Process of a Custom Strut 21 How to Order a Custom Strut 21 Strut Washers & Backing Plates 24 Hoses, Clamps & Hose Assemblies 26-27 Shaft Stuffing Boxes 28 Rudder Stuffing Boxes 29 Rudder Support Bearings 33 Motor Mounts & Washers 34-35 Outboard Rudder Assemblies 40-41 Tournament...

BRASS AND BRONZE STANDARD CASTING ALLOYS

Marine Hardware™, Inc. worked for years with most of the world's leading stainless steel bar mills to provide the ultimate in boat shafting quality. By combining our field experience with our metallurgical excellence, our goal is to bring to our customers a product that is superior in materials and exacting tolerances. Our aquanox™ shafting is used in yachts manufactured by Bayliner, Maxum, and Luhrs, to ski boats such as Malibu and Fineline as well as Unlimited Hydroplanes like the Miss Budweiser and Miss Bardahl. We supply bars in type 17, 19, 22 and 22HS with diameters ranging from 1 inch...

BEARING SPACING ANALYSIS - ABYC When calculating overall assembled length, please refer to the following formula to minimize whip of the shaft. L = Max Unsupported length, feet (m) D = Shaft diameter, inches (mm) E = Modulus of elasticity in tension, lbs/in2 (MPa) W1 = Weight of one cubic inch (cm3) of material, pounds (gm) SHAFT ANALYSIS Boat shaft requirements vary dramatically by both the alloy you select as well as the horsepower and gear ratio used to propel your boat. The alloy selection really is a choice of corrosion protection versus strength. Higher strength alloys are typically very...

'Ski Boat Flanged Nylock Nut MACHINING SPECIFICATIONS Nom. Shaft Dia. Note: For shafts of 3” diameter and larger, keystock material is machine-planed on one side so that it is no longer square. Keyway side depths on both shafts and couplers of these larger diameters are equal. All shafts 3/4” through 6” in diameter have 3/4” per foot taper. * Used on high-performance ski/surf boat shaft assemblies

DIAMETER TOLERANCES Allowable tolerance in overall diameter by size. PROPELLER SHAFTING WEIGHT PER LENGTH SHAFTING Diameter, inches SHAFT ASSEMBLIES STRAIGHTNESS TOLERANCES Specific diameter of shafting in inches * If bars sag excessively by the end method, it is advisable to test using 42” method. Marine Hardware™, Inc. inspects all Shaft Assemblies to American Boat and Yacht Council (ABYC) specifications. The green above indicates we inspect to .002 inches beyond the most stringent standards. Engineering Note: Safety factor for both ABYC and SAE specify when calculating appropriate shaft diameters,...

Shaft Assemblies When replacing a shaft, we recommend replacement with a factoryassembled shaft/coupler set. Our assemblies are precision bored, honed, faced, straightened, and balanced to ensure concentricity and reduce vibration and shaft whip. Materials are the highest quality available in the industry, and all machining meets or exceeds ABYC standards. Our assemblies can be shipped complete with all keys, nuts, and cotter pin. Specify loose fit assembly for applications where shaft & coupler must be disassembled for installation, such as refits. Specify tight fit assembly for applications...

1. Put propeller snugly onto shaft taper without the key in place. 2. Make a line with a non-graphite marker on the shaft around the forward edge of the prop hub. 3. Remove prop from shaft. 4. Put key into keyway on shaft taper with radiused or chamfered corners in keyway. 5. Put propeller onto shaft taper. 6. Check to see that propeller moves forward to line made in Step 2. If it does, skip to Step 7. If not, perform Steps 6a through 6f. a. If prop does not move forward to line, remove prop from shaft. Remove key and secure in vise with radiused or chamfered corners down and square corners up....

Couplers Marine Hardware™, Inc. manufactures a full range of shaft couplers, plus many special models depending on installation requirements, including V-drives. All are cast from pure bronze ingot or billet 6061-T6 aluminum and Computer Numerical Controlled (CNC) turned to insure absolute concentricity of the bore with the registration ring, part after part. All bolt patterns are jig-drilled and registered from the finished bore. We make all models and styles of couplers (except solid style) from 70 manganese bronze; also available in mild steel by special order. Certain styles for ski boats...

Couplers Marine Hardware™, Inc. manufactures and assembles a variety of couplings to meet your needs. As always, if room allows, a double taper bronze coupling insures the tightest tolerances for better accuracies. TAPERED BORE STYLE The many advantages of Marine Hardware™, Inc.’s tapered-bore coupler assembly have made it the style of choice for more than two decades. It has racked up an impressive durability and performance record in all types of craft from competition ski boats to large motor yachts. Tapered bore couplers offer many advantages over standard straight bore styles. Since the...