Propeller blade and hub bolts, fitted shaft coupling bolts, bearing, gearbox and engine holding-down bolts, rudder and steering gear bolting and deck machinery foundation bolts, made in Houston to your drawings and specifications.
One shaft line of a generic twin-shaft surface ship with controllable-pitch propellers: a five-blade propeller on a 520 mm tail shaft, 400 mm hollow line shafting with flanged couplings, a thrust bearing, a reduction gear and a gas turbine on resilient mounts. The hull is an outline only and lifts clear, then the line is stripped from the propeller forward: blade bolts out and the blades off the hub, the hub off the shaft flange, the strut bearing rings and shaft seal, the couplings unbolted and the shafts parted, then the bearings, gear case and turbine off their seatings, and last the rudder, steering gear and deck machinery. Every nut and screw backs off before its joint opens. The bolting we make is in colour. Press Solid view for a steel model, or Cutaway to see the hollow shafts, hub, stern tube, bearings and couplings in section.
Bolt each blade's foot to the crank ring inside the hub that sets its pitch: eight per blade and five blades here, typically in a seawater-resistant alloy such as nickel-copper K-500.
A ring of bolts holding the propeller hub on the 130 mm thick flange at the end of the hollow tail shaft, with torque pins and O-ring seals.
Cap screws through the retaining rings that hold the water-lubricated stave bearing in each end of the strut barrel.
Studs and nuts holding the stern tube's flange to the aft peak bulkhead, and cap screws holding the shaft seal housing on the end of the tube.
Fitted bolts driven into reamed holes in the forged flanges of the shaft sections: ten 65 mm bolts on a 640 mm bolt circle per coupling, sized by class rule for a 400 mm shaft.
Hold each line shaft bearing down on its seating and bolt its top cap to the base.
Clamp the thrust bearing to its seating through chocks, with collision chocks fore and aft.
Twelve a side through the main reduction gear's mounting flanges, onto chocks on the seating; some are fitted bolts that hold the shaft alignment.
Four screws under each of the eight resilient mounts and a centre bolt tying each mount to the module's base frame.
Fitted bolts with locked nuts joining the rudder stock's flange to the palm on the rudder blade: class rules ask for at least six; eight 75 mm bolts here.
Hold the carrier bearing, which takes the weight of the rudder and stock, down on its seating.
Bolt the rotary-vane steering gear's two anchor arms to their seatings, carrying the rudder torque into the hull.
Hold the anchor windlass's bedplate down on its seating on the forecastle against the pull of the chain.
Eight bolts through the base plate of each leg of the lattice mast, into stools on the deckhouse roof.
Propeller blade bolts, fitted coupling bolts, machinery holding-down bolts and rudder bolting, to your drawing. Send us your drawings and material spec.
Request a quote832-446-3442A generic illustration, not any ship, class or maker's design. The shaft diameters, coupling flanges, coupling bolts and rudder coupling bolts are sized from published classification rules for an assumed 20 MW at 200 rpm on the shaft; the hull outline (drawn much shorter than a real ship), propeller, bearings, gear case, turbine module, steering gear and deck machinery are illustrative, and the other bolt counts, sizes and materials are typical. Bolting is drawn on the starboard shaft line; the port side, in outline, carries the same. Your drawings and specifications govern. We manufacture to your drawings and specifications.
Shaft, coupling flange and coupling bolt sizes follow the published classification rules for propulsion shafting (IACS UR M68 and the ABS Marine Vessel Rules), and the rudder coupling follows IACS UR S10; everything else is drawn to typical proportions.
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