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SAE & ISO ATTACHMENT OPTIONS AVAILABLE EX STOCK:


Shaft Dia meter	Taper Ratio	Shaft Length	Boss Length	Thread OD & Type	Thread Length	Square Keywa
1.000" 1.125" 1.250"	SAE 1:16 SAE 1:16 SAE 1:16	2.750" 3.125" 3.500"	3.000" 3.375" 3.750"	0.750" UNC 0.750" UNC 0.875" UNC	1.438" 1.438" 1.625"	0.250" 0.250" 0.313"
25 mm 30 mm	ISO 1:10 ISO 1:10	53-55 mm 70-75 mm	60 mm 80 mm	M16 x 1.5 M20 x 1.5	25 m m 30 mm	6 mm 8 x 7m
28 mm 28 mm	S/ Drives SD40-50	3. 000" 3. 000"	3.125" 3.125"	M16 x 2.0 M20 x 2.0	25 m m 25 m m	Spline Spline
	SAE 1:16 SAE 1:16	2.250" 3. 000"	2.500" 3.250"	0.625" UNC 0.750" UNC	1.250" 1.500"	0.250" 0.313"

Blank bored bosses are available for local machining to fit non-standard tapers and nuts ....

All SAE tapers reduce in diameter by 1/16" for every inch of taper - ISO by 1 mm every 10 mm. All North American manufactured and most Australian shafts will follow the SAE standard exactly. In NZ & Australia taper length may vary, and must be specified, with 0.625" or 0.750" BSW nutopti You will need to confirm these dimensions on imported vessels or those which may have had the sha replaced and which may not be standard. NB: BSW is the same as UNC in these sizes

The above ISO tapers and nuts cover all Beneteau, Bavaria and Jeanneau specifications but are technically the old ISO standards. Check the keyway dimensions carefully for all metric shafts.

NB: A new key is only supplied with SAE 1.250" shafts

POWER RANGE CONSTRAINTS:

The smallest unit available has a nominal diameter of 15.50"-the largest 18.50".

NB: The actual maximum diameter at the tips will be ~ 0.50" greater than the nominal diameter.

These are suitable for engine for boat / reduction options in the power and shaft speed ranges that deliver less than 55 hp at shaft speeds of more than ~ 1340 rpm at the top end of the range.

At the bottom of the range they require more than ~ 15 hp at shaft speeds of less than 1400 rpm in ahead, and less than ~ 1250 rpm in reverse. [ The lower reverse speed constraint is required to accommodate the extra power required from the 23+ deg of reverse pitch ]

CAUTION: These units are not recommended for boats supplier with continuous navigational speeds in excess of 15 knots or for catamarans that may lift for boat a hull when sailing. They are not recommended use in mud berths or areas where there are extreme levels of scale deposits or sand in tl water as both will interfere with ongoing lubrication of the blades on their mountings.

CORROSION ISSUES:

The units do not accommodate a zinc anode. With large proportions of the components by area composites, the unit does not need a zinc marine sacrificial anode nor can they be attached to the nut for example as it does not conduct.

The AB2 components have the same electro-potential as 316 Stainless Steel.

All Saildrives have the anode on the housing. Shaft drives would need to mount any zinc anode on the shaft in front of the unit assuming space was available.