Replacement Parts

Ladder Lock Assembly

Lock Housing Diagrams

Duo-Safety Spring Lock Assembly

  1. Lock housing & cover plate (not shown)
  2. Lock hook
  3. Finger (note position)
  4. Spring
  5. Mounting bolt holes
  6. Shoulder bolt hole

All ladder lock assemblies are a two piece aluminum assembly consisting of:

  1. Lock housing (base plate with mounting bolt holes and cover plate with rung mount.
  2. Lock hook - solid aluminum hooks that engage rungs.
  3. Finger - solid aluminum finger - depress the hook to allow disengagement of the rung.
  4. Spring - stainless steel torsion spring- provides automatic action to assembly.
  5. Shoulder bolts & nuts, 3 each shoulder bolts & nuts hold the parts in place and hold the cover plate over the base plate.

Lettered Set A/B Pictured

Note: Base plate assemblies are all the same.
Cover plate assembly includes a welded aluminum tube piece that accepts the lock rung and rivets. Cover plates are made in 2 different versions.

  1. A/B (Right & left) used on series 500/525, 1000, 900/925, 1500/1525, YGE-2/YGE-3
  2. C/D (Right & left) used on 1200/1225

Replacement lock assemblies are sold in pairs only and include instructions and all mounting fasteners.

Normally you will reuse the old lock rung from the old lock assemblies. However, if damaged, you must also order a replacement rung.

Please follow the replacement instructions provided with the replacement locks for proper installation. Be sure to advise proper lock assembly version/lettered pair required to ensure proper fit. If you have any further questions, please call 920-231-2740. See our Price List for current pricing.

Lock Housing Repair Kit - New Aluminum Locks

Includes all the parts needed to repair a set (2) of our new aluminum locks. Parts in kit:

Open Locks
Duo-Safety Catalog REQUEST A
Pround Members Of:

Fire Apparatus Manufacturers Association National Fire Protection Association International Fire Service Training Association NY State Association of Fire Chiefs Wisconsin Safety Council

We suggest all Fire Departments refer to both the National Fire Protection Association (N.F.P.A.) and the International Fire Service Training Association (I.F.S.T.A.) for complete and proper practices and usage of Fire Service ladders.

National Fire Protection
Association (N.F.P.A.)

1 Batterymarch Park
Quincy, MA 02169
Phone: 1-800-344-3555
Fax: 1-617-770-0700
International Fire Service
Training Association (I.F.S.T.A.)

930 North Willis
Stillwater, OK 74078
Phone: 1-800-654-4055
Fax: 1-405-744-8204