Base-Bolted Sign Post System – Y4992

Base-Bolted Sign Support System

U-Channel post breakaway system
Base-Bolted Sign Support System
Item #:
Pricing Y4992
Price Per Kit:
Per Breakaway System
Need a quote for a large order? Call 800-274-6271 or .
Total Price: $13.95
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99% on-time shipping. Call 800-274-6271 for large orders or expedited shipping. Orders ship when all your items are ready. Shipping options and delivery dates available at checkout.
Special freight arrangements are necessary. Learn more

This breakaway system will support any type of warning, regulatory or guide signs, from small signs on single posts to very large signs or sign clusters on multiple posts. Base-bolted sign posts also work well for construction and temporary signing.

Use this sign support our 2 lbs./ft. U-Channel Posts.

This post anchor + bolting set system can be driven in to strong or weak soil and does not require a concrete foundation, however, when installed in weak soil a soil plate is required on each sign post.

This breakaway sign support system has been crash tested in strong and weak soil and have been adjusted to satisfy the requirements of 1985 AASHTO Standard specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals and the National Cooperative Highway Research Program Report 230.

Components: (2) 1" diameter x 5/8" thick steel spacers. (2) grade 9 hex head bolts measuring 5/16 x 2-1/4", (2) lock washers, (2) washers and (2) nuts

The splice hardware is cadmium plated in accordance with the requirements of ASTM A165-80, TYPE OS.

1 × ⅝″ Spacer & 5/16 × 2¼″ Grade 9 Bolts
Material Packaging Sku Quantity/Price
Cadmium Plated Splice Hardware + Steel Spacers Sold in Kits - Includes 2 bolts, 2 spacers, 2 lock washers, 2 washers, and 2 nuts Y4992 $13.95
Special Freight Arrangement: Due to the size of this product, freight shipping will be required. You may contact our customer service team for a quote or you can place your order and a customer service representative will contact you about freight shipping charges. If you would like to use your own freight carrier, please include your freight carrier account in the special instructions box at the bottom of the checkout page before placing your order. A customer service representative will be in contact with you if there are any questions.

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This breakaway system consist of the components specified below, and has been designed to break away at the stub upon impact. When assembly is struck the only part that suffers any damage is the top post making it easier to replace and install a new top post using the 3' anchor already in the ground.


  • One 3 ft Post Anchor (2 lb/ft green u-channel post) to be used only with 8 ft or 10ft top posts
  • Two high performance Grade 9 full thread bolts, two unique cylindrical spacers and nuts.
U-channel Breakaway sign post system

Our U-Channel Breakaway Sign Post System offers a tensile strength of 70,000 PSI - exactly the right strength for break-away post systems. All this strength, vehicle impact is transmitted through the post to the splice hardware. Systems using higher yield strength posts are brittle and can fracture at the point of impact (bumper height), scraping the bottom of the vehicle or puncturing the passenger compartment, the fuel tank or both.

Our breakaway sign post system costs considerably less than other competitive U-channel break-away systems. We only use two special bolts and spacers to join the base to the top post, your installation crews can install more posts faster; they will spend less time working by the side of the road, thus reducing their exposure to the risk of traffic related injuries.

This system securely nests and bolts two U-Channel posts together, yet breaks away on impact. The system has been tested and approved for multiple post installations. For single or multiple post installations, our Breakaway System stands up to a variety of wind pressure conditions and meets the new FHWA guidelines.

Breakaway Sign Post Installation:

  1. Dig a small, shallow hole approximately 6 inches in diameter and 2 inches deep; drive the ground post into the center of the hole leaving the top 4 inches above grade level exposed.
  2. Place one bolt in the 1st and 5th holes in the ground post. Slide a spacer and push-on retaining washer onto each bolt, leaving both bolts ends exposed.
  3. The top post is then nested over the end of the ground post and seated on the bolts. Lock nuts and washers are then installed and tightened and the earth around the post hole replaced and tamped firmly to complete the installation.
Safety Splice Installation

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