Breakaway Bases and Surface Bases

Kleen Break Breakaway Assemblies

Kleen Break

The Kleen Break system is available, depending on the application, in Ground Mount and Surface Mount Assemblies. The Kleen Break system provides flush mounting so that after an impact, the bottom portion will remain flush with the surface to prevent tripping hazard(s) to pedestrians. When properly installed, the Kleen Break assembly supports the sign and post at 100% of the strength of the post for windloading, yet breaks away per NCHRP 350 criteria when impacted.

  • Allows for 360° indexing for proper sign orientation after anchoring half is permanently set
  • All components are reusable with the exception of the shear bolt, which must be replaced after each impact
  • Reuse of rubber bushing and locking wedge is determined by their condition after impact
  • Accepts 1 3/4" and 2" square posts

Surface Mount Ground Mount Shear Bolt

Kleen Break Surface Mount with hardware

Kleen Break Ground Mount with hardware

Shear Bolt Assembly


Slip Bases

Slip Base Assemblies "break away" on impact, therefore reducing damage to the vehicle and its occupants. It's easy to install into the anchor; simply insert the bottom half of the slip base down into the anchor and secure with shoulder bolts. Then, insert the sign post into the top half receiver of the slip base and secure with shoulder bolts.

Upon impact, the top half of the slip base separates from the bottom half and in most instances the post sustains little or no damage. The slip base assembly can be used over and over again reducing waste and costs.

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8" Slip Base Assembly for 3" anchor and 2.5" post

8" Triangular Multi-Directional Slip Base Match Plate Hardware Kit

Surface Bases

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Pedestal Base - cast iron sign post base which attaches to concrete using anchor bolts; for 2" square posts

  • Three slotted anchoring holes in circular base
  • Two set screws positioned on the neck of the base
  • Drain grooves on the underside of bottom
  • Hot dipped galvanized finish

Concrete Barrier Mount - economic way to surface mount to median barriers and bridge rails; for
1 3/4" - 2 1/2" square posts

  • Bi-directional mounting bolt pattern creates a positive attachment that is virtually permanent under any condition
  • Hot dipped galvanized finish

Flat Concrete Base - an economical answer to surface mounting of square signposts; for
1 3/4" - 2 1/2" square posts

  • Installation is easy using a concrete drill and four concrete fasteners
  • Shimming with standard 1/2" washers may be done to plumb unit on sloping surfaces
  • Hot dipped galvanized finish


For additional information on Breakaway Bases and Surface Bases please contact the office and our customer service representatives will gladly provide more information on your options - Email Us or call (800) 296-6050.

  • ALPOLIC 350
  • Roll-Up Signs
  • Type III Barricades
  • Fleet Graphics
  • Traffic Signs
  • Posts and Accessories