Model O

dimensions

Length: 5′ 10¾” (180cm) 
Width: 57¾” (147 cm) 
Net Weight:  662 lbs (300 kg)

braces

3 solid spruce with a volume of 1,253 cu. In. (20,528cm3); Spruce provides tensile strength with less weight. Maple dowels fasten braces to rim producing a single homogenous foundation upon which is built the entire tonal component. The Steinway & Sons iron wedge anchors brace ends securely to crossblock assuring permanent rim posture.

scale

Overstrung; combination agraffe; Front AND rear duplex.
Tension: 41,888 lbs. (19,000 kg)

ribs

Made from durable, resinous sugar pine to assure strong and constant support of string down-bearing on the soundboard; rib ends are hand-fitted.

tuning pins

Premium blued steel; rust-resistant, nickeled heads

strings

Treble: ten whole & one-half sizes from high-tensile Swedish steel.
Bass: Swedish steel core wire wound with pure copper.
Longest: Agraffe/bridge: 54⅛” (137 cm)

hammers

Premium wool top felt and under felt; treated to resist insects and moisture. Compression-wired to maintain permanent shape. Hornbeam hammer moldings and shanks.

dampers

Horizontal-cut premium wool for effective dampening with maple heads for endurance.

keys

European spruce, individually weighed-off. Chip-proof, stain-resistant coverings for naturals; slip-proof, adbraded ebonized sharps. Durable Linden wood buttons reinforce keys over balance rail, permitting maximum tonal power with every strike. Longest key: 19″ (48.3 cm).

keybed

Made from planks of quarter-sawn spruce. Horizonal and vertical birch planks present a vented system for humidity escapement. Crowned and reverse-crowned action frame gives a snug fit, intensifies key movement and prevents “slapping” during heavy playing. Large maple dowel ends provide a solid mount for adjustable brass touch-regulating screws. Thickness: 1¾” (4.45 cm).

pedals

Heavy, solid brass. Soft, sustaining, and full sostenuto.