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Model K Overview

The longest bass string in the Steinway K upright is longer than the longest bass string in the Steinway Model S (5’1”) grand, at 46 3/8” on the K versus 45 1/2” on the S. This is why this piano is often called the “upright grand”. It requires 12 months to craft a Steinway grand, 10 months for the K-52, employing precisely the same materials and superb workmanship as the grands. It is the only upright with a solid laminated maple closing rim to configure the soundboard into the shape and sound of a baby grand.

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Available Model Ks

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The New Model K Customer

Who's it for?

  • The K52 is for those without the space for even the baby grand model S (5’1”) yet who want the rich sound of a grand.
  • It is a first choice for serious students and professionals who insist on the best sound and touch available in an upright design.


Who's it not for?

  • Not for those with limited budgets looking at upright pianos.  


Model K Specifications

Introduced in 1903, this piano features a larger soundboard than many grands, for a more resonant voice. The choice for professional players seeking an upright instrument — and perfect for all sizes of homes and apartments.


Height 52″ (132 cm)
Width 60 3/4″ (154 cm)
Depth 26 3/8″ (67 cm)
Net Weight 600 pounds (273 kg)


Posts: 5 full-length tapered solid spruce braces with a volume of 3,600 cu. in. (58,993cm3): assures that backframe will remain straight, promoting stable and consistent tuning. Strategically positioned with bottom ends tenoned into birch foot-piece for positive vertical alignment. Spruce fill-blocks between posts at top of backframe capped with solid birch backing board for positive horizontal alignment.


Overstrung; twenty-six note bass/tenor break. Treble duplex. Tension: 37,500 lbs. (16,875 kg)


Made from durable, resinous sugar pine to assure strong and constant support of string down-bearing on the soundboard. Rib ends are hand-fitted into their mounting surfaces virtually locking in the important soundboard crown.

Tuning Pins

Premium blued steel; rust-resistant, nickeled heads


Treble: Ten whole & one-half sizes from high-tensile Swedish steel. Bass: Swedish steel core wire wound with pure copper. Longest, pressure bar/bridge: 46 3/8″ (118 cm)


Premium wool top felt over premium wool under felt; treated to resist insects and moisture. Compression-wired to retain permanent shape. Hard rock maple hammer moldings and shanks.


Vertical-cut premium wool for effective dampening. Hornbeam heads for endurance.


White, quarter-sawn hornbeam parts are bushed with specially treated wool action cloth for freedom from friction. Parts are anchored in hard maple rails. Dependable, Direct-Blow design permits ALL parts of the action to lie above the brass capstan screws.


European spruce, individually weighed-off. Chip-proof, stain-resistant coverings for naturals; slip-proof, delicately abraded ebonized sharps. Tough, durable Linden wood buttons reinforce keys over balance rail permitting maximum tonal power with every strike. Longest: 16 1/8″ (40.9 cm)


Made from planks of stable, quarter-sawn poplar. Horizontal planks are freely mortised together, while their ends are permanently mortised into vertical planks made of birch, presenting a vented system for humidity escapement while allowing for necessary expansion and contraction. Hand-milled to be flat and true correlating with keyframe for snug fit. Strong, rugged construction provides a solid mount for keyframe and action allowing for precise and prolonged action regulation. Thickness: 1 3/4″ (4.45 cm)


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



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The Piano Buyer’s Guide

Pianists deserve a resource that’s easy to follow and gets them closer to the piano of their dreams without the confusion in between. Our Piano Buyer’s Guide offers tips, facts, and insights into the world of pianos so you can get the answers you need to make the wisest decision.

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