We feature Aqualoy marine shafting (AQ17, AQ19, and AQ22 high strength) ranging from ¾" to 8" with lengths up to 28' machined to meet any required specifications.
Engineered for superior corrosion resistance and durability, Aqualoy shafting is a trusted choice for reliability and performance in even the harshest marine environments. Let us provide the quality and customization your project demands.
AQ19 (standard boat shaft)
Always available with quick turn-around time in our machine shop.
Aqualoy 19 shafts have proven to be successful in several types of boats including sport fishing, and other pleasure crafts, as well as workboats where improved corrosion resistance is desired.
Aqualoy 19 boat shafting is a chromium-nickel stainless steel that is fully austenitic, nonmagnetic, and strengthened by a nitrogen addition. Corrosion resistance is superior to type 304 and better than Aqualoy 17 shafting. However, like type 304,
Aqualoy 19 is susceptible to crevice attack when allowed to remain idle for prolonged periods in salt or brackish water. All shafts should have proper cathodic protection against corrosion. Navy Grade zinc anodes, sufficient in number and properly installed, usually provide satisfactory protection.
Aqualoy 19 has also proven itself in demanding service on shrimpers, crabbers, scallopers, and other fishing boats as well as on pleasure boats. Aqualoy 19 provides superior toughness and strength, and Aqualoy 19 shafts are competitive with most carbon steel shafts since the latter are fitted with sleeves and are frequently covered with fiberglass. With AQ19, there is no need for such sleeves or fiberglass, and smaller bearings and stuffing boxes can be used, resulting in lower overall cost.
Aqualoy 19 Available Sizes
AQ22 (high-strength boat shaft)
Stocked locally and readily available for special order.
Aqualoy 22 provides the best combination of corrosion resistance and strength for marine applications for 2” diameter and under. It is ideal for pleasure boats, considering that these boats spend much of their time docked where corrosion factors may be highest.
Aqualoy 22 has corrosion resistance better than any other boat shafting material, even better than most high-nickel alloys. Aqualoy 22 boat shafting provides yield strength in torsion up to 3.5 times that of most boat shafts now used, plus excellent toughness. Special processing controls provide consistent, high-quality AQ22 boat shafts that are precision straightened, centerless ground and polished to exacting marine tolerances. Aqualoy 22 is an austenitic alloy and is non-magnetic.
Superior Corrosion Resistance
Aqualoy 22 provides outstanding corrosion resistance. For example, in quiet seawater tests, Aqualoy AQ22 proved superior to type 316 stainless steel, long considered the standard for corrosion resistance in marine environments. After immersion for nine months, both alloys were covered with barnacles and other marine organisms. After cleaning, the AQ22 boat shaft was found totally unaffected, while type 316 exposed similarly suffered random pitting and crevice corrosion. Results of laboratory tests also demonstrate 22’s superior resistance to different types of corrosion. One such test involved a 50-hour exposure in an acidified 10% ferric chloride solution. Finally, an 18-month test in actual seawater was conducted comparing AQ22 with Alloy 400 (Ni-Cu). Results showed that Aqualoy 22 was superior. Even though AQ22 is so highly resistant to corrosion, cathodic protection is recommended to avoid galvanic corrosion in salt and brackish water. Navy Grade zinc anodes, sufficient in number and properly installed, usually provide satisfactory protection.
Aqualoy 22 Available Sizes
Aqualoy 22 High Strength
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Kruger & Sons
4463 26th Ave W.
Seattle, WA 98199
(206) 283-7707 – Local
(800) 762-7767 – Toll Free
(206) 283-0586 – FAX
Hours
Monday – Friday
8:00 AM – 4:30 PM PST
Saturday-Sunday: Closed