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Anchors & Concrete Fixings · Trade series (Hilti HDA-T)

A2 (304) Stainless Steel Hilti HDA-T Self-Undercutting Mechanical Anchors

Mechanical properties, corrosion behaviour and the full dimensional range for this grade.

A2 Stainless Steel Hilti HDA-T Self-Undercutting Mechanical Anchors are supplied to ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70. Corrosion behaviour is good general corrosion resistance, the material is largely non-magnetic, and the usable service range is approx. -200 °C to +400 °C, subject to the property class and the joint. In practice this grade is the most common stainless group for indoor and general outdoor fasteners.

Grade
ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70
Corrosion resistance
Good general corrosion resistance
Magnetic response
Largely non-magnetic
Service temperature
approx. -200 °C to +400 °C, subject to the property class and the joint

Property values are typical for the grade. Certified mechanical test data is available on request for production orders.

A2 (304) Stainless Steel Hilti HDA-T Self-Undercutting Mechanical Anchors reference image

Material specification page for hilti hda-t self-undercutting mechanical anchors in A2 Stainless Steel. Covers the grade designation (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to Trade series (Hilti HDA-T).

Why Choose A2 Stainless Steel for Hilti HDA-T Self-Undercutting Mechanical Anchors

The most common stainless group for indoor and general outdoor fasteners. For hilti hda-t self-undercutting mechanical anchors, this matters when good general corrosion resistance is the primary requirement.

Mechanical & Physical Properties

Grade designationISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70
Magnetic responseLargely non-magnetic
Service temperatureapprox. -200 °C to +400 °C, subject to the property class and the joint
Corrosion characteristicGood general corrosion resistance

Corrosion Behavior in Service

A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Hilti HDA-T Self-Undercutting Mechanical Anchors in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).

Comparable Grades

For Hilti HDA-T Self-Undercutting Mechanical Anchors, the alternative stainless grade is A4 (316). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.

Using Stainless Fasteners in Aluminum

Stainless steel is more noble than aluminum, so in the presence of an electrolyte — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. The effect is driven by the area ratio: a small stainless fastener in a large aluminum section is normally acceptable, while a large stainless fastener in thin aluminum is not. Where the joint is wet, isolate the two metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.

Sizes of Hilti HDA-T Self-Undercutting Mechanical Anchors Available in A2 Stainless Steel

Anchor sizeAvailable embedment options (mm)Maximum fixture thickness options (mm)FinishBase materialLoad cases
M10100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic
M12100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic
M16100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic
M20100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic

Technical Drawing

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Specification
Business Information

Dimensions & Specifications (Trade series (Hilti HDA-T))

Anchor sizeAvailable embedment options (mm)Maximum fixture thickness options (mm)FinishBase materialLoad cases
M10100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic
M12100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic
M16100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic
M20100 / 125 / 190 / 25020 / 30 / 40 / 50 / 60 / 100electro-zinc plated, minimum 5 u00b5mcracked and non-cracked concretestatic / dynamic / seismic

Applications & Industries

What Hilti HDA-T Self-Undercutting Mechanical Anchors are specified for, industry by industry. Stocked from M10 to M20.

Industries that specify Hilti HDA-T Self-Undercutting Mechanical Anchors

  • Plant installation Machine hold-downs where edge distance and spacing need design control.
  • Infrastructure maintenance Anchored rails, barriers and brackets in existing concrete.
  • Concrete base plates Post-installed threaded anchors for steel columns and equipment frames.
  • Bridge retrofit Removable structural attachments installed in existing cracked concrete.
  • Plant installation Machines and equipment held down to a concrete floor.
  • Fit-out & drylining Fixings into board, block and hollow wall.

Typical applications

  • using an externally threaded fixing where the fixture may be removed
  • selecting the installation from the applicable Hilti approval or design report
  • creating a mechanical undercut in a drilled concrete hole
  • installing a threaded anchor with a specified embedment and fixture thickness
  • suspended services on threaded rod
  • making a load-bearing threaded fixing in concrete or masonry

Service conditions to specify against

Marine and coastal
Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
The concrete governs
Capacity is a property of the base material and the geometry — grade, edge distance, spacing and cracked or uncracked — not of the anchor alone. Work to the anchor manufacturer's ETA or ICC-ES report.
Hole preparation
Drilled diameter, depth and cleanliness are part of the specification; an uncleaned hole is the single most common cause of a failed anchor.

Where to use something else

  • Do not use the catalog series options as an allowable load table; the approval controls concrete condition and capacity.
  • Not for a substrate the type is not qualified in — an expansion anchor near an edge or in hollow block will split it.

Full application guide: where Hilti HDA-T Self-Undercutting Mechanical Anchors are used, how to specify them, and the cases they are wrong for

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Frequently Asked Questions

What's the service temperature limit for A2 Stainless Steel?

The practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint.

Can A2 Stainless Steel replace plated alloy steel structurally?

Only at the standard strength classes — A2-70 / A4-80 are roughly equivalent to class 7 steel; A4-100 reaches class 8.8. For class 10.9 or 12.9 strength, plated alloy steel is required.

Are A2 Stainless Steel Hilti HDA-T Self-Undercutting Mechanical Anchors magnetic?

A2 Stainless Steel Hilti HDA-T Self-Undercutting Mechanical Anchors are largely non-magnetic.

What corrosion resistance do A2 Stainless Steel Hilti HDA-T Self-Undercutting Mechanical Anchors offer?

A2 Stainless Steel Hilti HDA-T Self-Undercutting Mechanical Anchors provide good general corrosion resistance with a service range of approx. -200 °C to +400 °C, subject to the property class and the joint.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.