1. Home
  2. Programs
  3. Engineering Services (DES)
  4. Authorized Materials Lists (AML)
  5. Undercut Type Mechanical Expansion Anchors (MEA)

Undercut Type Mechanical Expansion Anchors (MEA)

Last edit date: 11/4/2022
MEA
Diameter		 Manufacturer Product Name Material Type ESR (4) Stud
Diameter		 Anchor
Length (5)		 hef (3)BABA Act Information*
3/8"Dewalt CCU + Undercut Anchor Stainless steel 4810 3/8" 6" 4"Unconfirmed
Hilti Corporation North America HDA Undercut Anchor Stainless steel 1546 10 mm (3/8" equiv.) 150 mm (5.91") 3.94"Unconfirmed
1/2"Dewalt CCU + Undercut Anchor Stainless steel 4810 1/2" 7-1/2" 5"Unconfirmed
Hilti Corporation North America HDA Undercut Anchor Stainless steel 1546 12 mm (1/2" equiv.) 190 mm (7.48") 4.92"Unconfirmed
5/8"Dewalt CCU + Undercut Anchor Stainless steel 4810 5/8" 10-3/4" 7-1/2"Unconfirmed
Hilti Corporation North America HDA Undercut Anchor Stainless steel 1546 16 mm (5/8" equiv.) 275 mm (10.83") 7.48"Unconfirmed
3/4"Dewalt CCU + Undercut Anchor Stainless steel 4810 3/4" 14" 10"Unconfirmed

Notes:

  1. The Undercut MEA size and structural capacity of an individual Undercut MEA anchor or anchor group shall be determined based on ACI 318-14, or later editions. Refer to the Division of Engineering Service’s Structural Design Alert – Anchorage to Concrete, dated 5/11/2020.
  2. The Undercut MEAs are to be installed in accordance with the manufacturer’s installation instructions.
  3. ‘equiv.’ = Equivalent, ‘hef’ = Effective Embedment Depth.
  4. International Code Council - Evaluation Service Report (ICC-ESR) per ACI 355.2.
  5. Anchor lengths shown are minimum acceptable lengths. The use of longer anchors is permitted.
  6. See Figure 1: Undercut MEA.
Figure 2: Undercut MEA
Figure 1: Undercut MEA

Caltrans contact: Joe Harline, (916) 206-4373, joe.harline@dot.ca.gov

*As attested to by the supplier as of April 14, 2026 per definition in 2 CFR 184 and 23 CFR 635.410. Stakeholders should use this information in conjunction with corresponding Caltrans special provision section 6-1.04 to understand applicable requirement for the project.

The California Department of Transportation (Caltrans) is implementing statutory changes required by the Bipartisan Infrastructure Law -Build America, Buy America Act (BABA), as outlined in 2 CFR 184 and 23 CFR 635.410.

https://www.fhwa.dot.gov/construction/cqit/buyam.cfm