ICC-ES AC133 is an ICC Evaluation Service (ICC-ES) acceptance criteria used to evaluate mechanical splice (coupler) systems for steel reinforcing bars (rebar) installed in concrete construction.
AC133 is commonly referenced when manufacturers need a consistent qualification path for rebar couplers, and when project teams need documentation that supports code acceptance and evaluation reports for a specific splice system. If you need help mapping your coupler type and bar sizes to a practical lab setup, talk with our team.
ICC-ES AC133: Acceptance Criteria for Mechanical Splice Systems for Steel Reinforcing Bars
AC133 is an acceptance criteria document (not a single bench-level “test method”) that defines how mechanical splice systems for reinforcing steel are evaluated for recognition within the ICC-ES evaluation report program.
Because AC133 is used for product acceptance and code-facing documentation, testing is typically performed by qualified laboratories using controlled axial loading and clearly defined measurement and reporting practices.
Quick definition
What it is: ICC-ES acceptance criteria for qualifying mechanical rebar splice systems (couplers and related components) used to connect deformed steel reinforcing bars in concrete construction.
What it does: Establishes evaluation and testing expectations (including cyclic and monotonic loading and slip/strain measurement concepts) used to support ICC-ES recognition of a splice system.
What it is not: A universal substitute for project specifications, ACI detailing requirements, or manufacturer installation instructions.
What This Standard Covers
AC133 addresses mechanical splice systems used to connect uncoated, deformed steel reinforcing bars installed in concrete. It is applicable to splice systems that are field-assembled onto reinforcing bar ends (prepared either at a factory or at the jobsite) and to systems that include components factory-attached to the reinforcing bars.
Depending on the splice design, the “system” under evaluation can include the coupler itself and/or sleeves, grout, specially prepared bar ends (such as threaded ends), and other components required to form the mechanical connection.
Why This Standard Matters in Testing
Mechanical splices are often selected to reduce congestion, support prefabrication, or avoid long lap lengths. AC133 provides a uniform evaluation framework so splice systems can be compared and documented under a consistent acceptance pathway.
From a testing standpoint, AC133-driven programs often require controlled axial loading in both tension and compression, including cyclic loading that passes through zero load, with measurement practices that can quantify splice behavior under repeated demand.
Common Materials, Product Types, or Applications Covered
Common product types: Mechanical rebar couplers and splice systems (including sleeve-style and threaded-style systems), and assemblies that incorporate two reinforcing bar segments with the splice hardware.
Common applications: Reinforced concrete construction where a mechanical connection is used in place of a lap splice, including situations where bar continuity, constructability, or staging drives the use of couplers.
Typical evaluation target: The installed splice assembly (coupler + reinforcing bar ends) rather than the reinforcing bar material alone.
Common Test or Verification Workflow
AC133 is frequently used as the basis for a qualification program that builds a record for product acceptance. While the exact plan depends on the splice type and the recognition being sought, the workflow commonly centers on assembling representative splice specimens using the manufacturer’s required preparation/installation steps, then applying axial loading sequences that can include both monotonic and cyclic tension/compression demands.
Common workflow elements: Specimen assembly using the specified bar size(s) and splice model(s); axial loading in tension and compression; cyclic loading profiles for qualifying performance under repeated demand; and measurement practices intended to track deformation behavior (such as slip/strain measurement concepts) during and after cycling.
Equipment Commonly Used for This Standard
Because AC133 evaluations can involve high-force rebar assemblies and cyclic tension/compression, equipment selection typically focuses on load capacity, alignment, gripping reliability, and closed-loop control capability.
Common equipment families: High-capacity universal testing machines (UTMs) or servo-hydraulic test frames capable of axial tension and compression; high-strength rebar grips or wedge-style gripping systems designed for deformed bar; load cells sized for the target bar grades and diameters; and extensometry/displacement measurement suitable for tracking deformation during cyclic loading.
Practical quoting caution: The required capacity and gripping approach often depend on the largest bar size, target strength level, and whether the program includes through-zero cyclic loading. If you are specifying a new system for coupler qualification work, you can request a detailed quote with your bar sizes and target loads so the frame, grips, and control package are matched to the program.
How to Read This Designation or Revision
Designation: “AC133” identifies the ICC-ES acceptance criteria document number for mechanical splice systems for steel reinforcing bars.
Edition sensitivity: ICC-ES acceptance criteria can be revised and re-issued as new editions. Project specifications, evaluation reports, or approval submittals may cite a particular edition year or edition number—so lab setup, loading profiles, and reporting expectations should be matched to the exact cited AC133 edition.
Related Standards, Methods, or Frameworks when useful
AC133 is commonly used alongside broader building-code and reinforced concrete frameworks that govern when mechanical splices are permitted and how they are classified for structural use. In many programs, separate tensile testing references for reinforcing bar material properties may also be used as part of the overall evaluation plan.
Note: Always align the test plan with the project specification and the specific ICC-ES evaluation report pathway being pursued, since those documents drive what “compliance” means for your specific splice system.
Talk through an AC133 test setup
If you’re planning AC133 qualification testing for a coupler line (or upgrading capacity for larger bars and cyclic loading), contact our team with your bar sizes, coupler type, and target acceptance path so we can help you narrow the right frame capacity, grips, and measurement package.