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Polished brass mortise lockset body, left-hand, vestibule function, scissor and anti-friction latch, no thumb turn

Marks USA

Marks USA 6DW/3 Grade 2 Mortise Lockset Body Polished Brass Left Hand Vestibule Function

SKU CH-37D1-AXBGQ

Grade 2 mortise lockset body with vestibule function, scissor and anti-friction latch, no interior thumb turn, polished brass finish, left-hand operation

  • FinishPolished Brass
  • TypeMortise Lockset
  • KeyingKeyed Different
  • Grade 2 mortise body withstands heavy commercial use
  • Vestibule function keeps exterior locked while interior stays free
  • Scissor and anti-friction latches ensure smooth, reliable operation
  • No interior thumb turn prevents unauthorised lock changes
  • Polished brass finish resists corrosion and matches classic hardware

Mortise Lockset Body for Handlesets

This Grade 2 mortise lockset body fits Marks 6 Series handlesets including Crown, Towne and Grand Towne designs. It provides a vestibule function with a scissor latch and anti-friction latch only, omitting a bolt and rocker mechanism. The polished brass finish suits period hardware. No thumb turn is present on the interior side.

Sustained Duty in Commercial Use

Built to Grade 2 standards, the lockset body withstands repeated operation in commercial vestibule doors where the outside lever remains locked. The scissor and anti-friction latches engage smoothly over high cycle counts. The wide 1-1/4" x 8" front face plate distributes load across the mortise pocket. Left-hand orientation ensures consistent latch action.

Compatibility Checks Before Ordering

Verify your existing handleset trim matches the listed Marks styles such as Crown or Towne, as discontinued designs may still fit but are not guaranteed. Confirm the door preparation uses a 2-3/4" backset and accommodates the wide face plate dimensions. Ensure the door handing is left hand and that no interior thumb turn is required for your application.

Highlights

  • Grade 2 mortise body withstands heavy commercial use
  • Vestibule function keeps exterior locked while interior stays free
  • Scissor and anti-friction latches ensure smooth, reliable operation
  • No interior thumb turn prevents unauthorised lock changes
  • Polished brass finish resists corrosion and matches classic hardware

Specifications

FinishPolished Brass
TypeMortise Lockset
KeyingKeyed Different

Questions about this item

Does the 2-3/4" backset mortise body generate noticeable heat or noise during continuous daily use?

The lock body contains only mechanical scissor and anti-friction latches with no motor or electronic components, so it produces no heat and operates silently.

Which handleset trim must I already own for this left-hand vestibule body to function?

It fits Marks Cambridge, Crown, Grand Crown, Georgetown, Heritage, Madison, Grand Madison, Newport, Portland, Towne, Grand Towne, Claremont, Wharton and Georgian handleset styles.

Will the scissor latch engage correctly with an existing 1-1/4" wide strike plate and standard door prep?

Yes — the wide front face plate measures 1-1/4" x 8" and the 2-3/4" backset matches standard commercial mortise preparation.

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