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Polished brass mortise cylinder door lock 125B SE1 keyway

Tuff Stuff

Tuff Stuff 125B Polished Brass 1-1/4" Mortise Cylinder Door Lock SE1 Keyway

SKU CH-QP16-JE0QH MPN 125B

Solid brass mortise cylinder with Segal SE1 keyway fits standard 1-1/4 inch locks and includes a Yale cam

  • Lock keyingKeyed Different
  • Surface finishPolished Brass
  • Sold asBox
  • Solid brass cylinder resists corrosion
  • Polished brass US3 finish matches classic hardware
  • SE1 Segal keyway fits existing key systems
  • 1-1/4" mortise size suits standard door prep
  • Five-pin tumbler mechanism allows re-keying flexibility

Solid brass mortise cylinder

The Tuff Stuff 125B is a solid brass mortise cylinder with a US3 polished brass finish. It uses a Segal SE1 keyway and ships keyed different. The cylinder measures 1-1/4 inches and includes a standard Yale cam. It is designed for indoor and outdoor door lock replacement.

Check door thickness and cam fit

Verify that the existing mortise pocket accepts a 1-1/4 inch cylinder before ordering. Confirm the current lock uses a compatible cam or that the supplied Yale cam matches the hardware. The cylinder can be re-keyed and works with different cams, but the original cam must suit the lock mechanism.

Replaces worn or mismatched cylinders

This cylinder replaces damaged or incompatible mortise cylinders in residential or commercial doors. The jump is worth it when the original cylinder binds, loses pins, or uses a keyway that no longer matches the building system. Solid brass construction resists corrosion better than plated zinc alternatives.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 77% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameTuff Stuff
Model name125B
Size & build
Surface finishPolished Brass
More details
Lock keyingKeyed Different

Questions about this item

What comes in the box and do I need to buy keys or cams separately?

The box contains the solid brass mortise cylinder with a standard Yale cam already fitted and two cut keys for the Segal SE1 keyway. No extra keys or cams are required for installation.

Should I choose this 1-1/4" cylinder or a different length for my door?

Select the 1-1/4" length when your existing mortise pocket measures that depth; it is the common size for standard residential and light commercial mortise locks.

What does the 5-pin tumbler and SE1 keyway mean for everyday security and key duplication?

The 5-pin Segal SE1 keyway provides standard pick resistance and can be duplicated at most locksmiths or hardware stores that stock SE1 blanks.

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