Home » Lag Shield Anchors for Masonry & Concrete Fastening | Zinc Alloy | For DIN 571 Lag Screws

Lag Shield Anchors for Masonry & Concrete Fastening | Zinc Alloy | For DIN 571 Lag Screws

FULLERKREG Lag Shield Anchors — Zinc Alloy | For Use with DIN 571 Lag Screws

FULLERKREG lag shield anchors are heavy-duty expansion anchors designed for secure fastening into concrete, brick, block, and solid masonry substrates. When a DIN 571 hex head lag screw is driven into the shield, the anchor expands outward against the hole wall, generating high radial clamping force for a reliable, load-bearing connection.

Manufactured from die-cast zinc alloy, FULLERKREG lag shields offer excellent corrosion resistance, dimensional consistency, and reliable expansion performance across a wide range of base materials.

Lag Shield Anchor Product Overview Lag Shield Anchor Structure Diagram Lag Shield Anchor Installation Steps Lag Shield Anchor Short vs Long Comparison Lag Shield Anchor Dimensional Drawing

Key Features

  • Material: Die-cast zinc alloy — corrosion-resistant, dimensionally precise, consistent expansion performance
  • Anchor Type: Lag shield (shell expansion anchor) — expands radially as lag screw is driven in
  • Compatible Fastener: DIN 571 hex head lag screws (coach screws, metric thread)
  • Base Materials: Concrete (normal and lightweight), solid brick, hollow brick, concrete block, natural stone
  • Types Available: Short (S) and Long (L) — short for hard/dense substrates; long for softer or hollow-core masonry
  • Installation: Hammer-set into pre-drilled hole; no special tooling required beyond standard drill and wrench
  • Reusability: Lag screw can be removed and re-driven; anchor remains in place

How Lag Shield Anchors Work

  1. Drill: Drill a hole in the masonry substrate to the specified diameter and minimum embedment depth using a carbide-tipped masonry bit.
  2. Clean: Remove dust and debris from the hole (blow out or vacuum).
  3. Insert: Tap the lag shield into the hole flush with or slightly below the surface.
  4. Drive: Pass the DIN 571 lag screw through the fixture and into the shield. As the screw is tightened, the shield expands outward against the hole wall.
  5. Torque: Tighten to the recommended installation torque for the anchor size. The expansion is complete when the screw meets resistance.

Short Type vs. Long Type

Type Description Best For
Short (S) Shorter body, single-piece expansion Hard concrete, dense solid brick, natural stone — high-strength base materials
Long (L) Longer body, greater embedment depth Softer masonry, lightweight concrete block, hollow brick — lower-strength or porous substrates

Dimensional Specifications

All dimensions per standard lag shield anchor specifications. Anchor body length (L) refers to the overall length of the shield body before installation.

Anchor Size DIN 571 Screw Dia. Drill Bit Dia. (mm) Short Body Length (mm) Long Body Length (mm) Min. Embedment — Short (mm) Min. Embedment — Long (mm) Min. Hole Depth — Short (mm) Min. Hole Depth — Long (mm)
1/4" (M6) 1/4" / M6 12 25 38 32 44 38 51
5/16" (M8) 5/16" / M8 14 32 44 38 51 44 57
3/8" (M10) 3/8" / M10 16 38 57 44 63 51 70
1/2" (M12) 1/2" / M12 19 51 76 57 82 64 89
5/8" (M16) 5/8" / M16 22 64 95 70 102 76 108
3/4" (M20) 3/4" / M20 28 76 114 82 121 89 127

Dimensions are nominal reference values. Always verify against the specific product datasheet for your application. Hole depth = embedment depth + fixture thickness allowance.

Compatible Fastener: DIN 571 Lag Screw

FULLERKREG lag shield anchors are specifically designed for use with DIN 571 hex head lag screws (also known as coach screws). Key pairing requirements:

  • Match the lag screw nominal diameter to the anchor size designation (e.g., M10 lag screw → 3/8" lag shield)
  • Lag screw length must be sufficient to engage the full depth of the shield body plus the fixture thickness
  • DIN 571 lag screws have a coarse wood-screw thread form that engages the interior of the zinc alloy shield as it expands
  • Do not substitute with machine screws or bolts — the thread form and taper are specific to lag screw geometry

Load Capacity Guidance

Actual load capacities depend on base material strength, embedment depth, anchor type (short/long), and installation quality. The following are general reference ranges for normal-weight concrete (≥ 25 MPa / 3,600 psi):

Anchor Size Type Approx. Tensile Load (kN) Approx. Shear Load (kN)
1/4" (M6) Short 2.2 – 3.1 1.8 – 2.5
3/8" (M10) Short 5.3 – 7.1 4.0 – 5.8
3/8" (M10) Long 6.7 – 8.9 5.3 – 7.1
1/2" (M12) Short 8.0 – 11.1 6.2 – 8.9
1/2" (M12) Long 10.7 – 14.2 8.0 – 11.1
5/8" (M16) Long 15.6 – 20.0 11.6 – 15.6
3/4" (M20) Long 22.2 – 28.9 16.9 – 22.2

Values are indicative only. For structural or safety-critical applications, consult a qualified engineer and refer to project-specific pull-out test data. Loads shown are ultimate values; apply appropriate safety factors per local building codes.

Typical Applications

  • Anchoring wood sill plates, ledger boards, and structural lumber to concrete foundations
  • Securing shelving brackets, handrails, and guardrails to masonry walls
  • Mounting electrical conduit, pipe hangers, and HVAC supports to concrete ceilings and walls
  • Attaching door frames, window frames, and curtain wall elements to block or brick
  • Fixing machinery bases, equipment pads, and anchor bolts in industrial settings
  • General construction, renovation, and MRO fastening into masonry substrates

Installation Best Practices

  • Drill perpendicular: Ensure the hole is drilled straight and perpendicular to the surface for uniform expansion.
  • Correct bit size: Use the exact recommended carbide-tipped masonry drill bit diameter — oversized holes reduce holding power significantly.
  • Clean the hole: Blow out or vacuum all dust before inserting the anchor; debris reduces expansion contact area.
  • Full insertion: Drive the shield fully into the hole so it is flush or slightly recessed — do not leave it proud of the surface.
  • Do not over-torque: Tighten the lag screw to the recommended torque. Over-torquing can strip the shield or crack the base material.
  • Edge and spacing distances: Maintain minimum edge distance ≥ 5× anchor diameter and center-to-center spacing ≥ 10× anchor diameter to prevent concrete splitting.
  • Avoid cracked concrete: Lag shield anchors are not rated for use in cracked concrete. Use seismic-rated anchors for such applications.

Material: Die-Cast Zinc Alloy

  • High-pressure die-cast zinc alloy (Zamak-grade equivalent) — consistent wall thickness and dimensional accuracy
  • Good corrosion resistance in dry indoor and sheltered outdoor environments
  • Ductile enough to expand uniformly without cracking under installation torque
  • Non-sparking — suitable for use in environments with flammable materials
  • Not recommended for prolonged immersion or highly corrosive (marine/chemical) environments without additional protection

Packaging & Supply

  • Available in standard retail boxes (anchor only) and combo packs (anchor + DIN 571 lag screw)
  • Bulk supply available for contractors, distributors, and OEM customers
  • Packaging quantities: 25 pcs, 50 pcs, 100 pcs, 500 pcs per box (custom quantities on request)
  • Full dimensional and material documentation available on request
  • B2B wholesale pricing available — contact FULLERKREG for volume quotations

Why Choose FULLERKREG Lag Shield Anchors?

  • Die-cast zinc alloy construction ensures consistent wall thickness and reliable, uniform expansion every time
  • Precisely matched to DIN 571 lag screw thread geometry for optimal engagement and holding power
  • Short and Long types available to match substrate hardness and embedment requirements
  • Full size range from 1/4" to 3/4" (M6–M20) for versatile application coverage
  • Competitive lead times for standard sizes; custom configurations on request
  • Consistent quality with dimensional inspection and material certification available
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