Hilti HST3 Anchor Installation Guide and Specifications

Document Identifier: 2107685-06.2021

Anchor Specifications

HST3 / HST3-R	t_{fix, min}	t_{fix, max}	h_{nom, min}	h_{nom, max}	h_min	h_nom
M8x75 10/-	10	10	54	54	80	54
M8x95 30/-	30	30	54	54	80	54
M8x115 50/7	7	50	54	97	26+h_nom	54

Diagram illustrating anchor dimensions: h_{nom, min} / h_nom ⭕, h₁ / h_{1, nc}, t_{fix, min}, t_{fix, max}, h_{nom, max}, h_min. Also shows minimum edge distance and spacing requirements: (h_min-h₁) / (h_min-h_{1, nc}).

Installation Procedure

Step 1a: Drilling

Drill a hole perpendicular (90°) to the surface. The required hole diameter (d₀) is 8mm. The hole depth (h₁) must be equal to h_nom + 5mm.

[Illustration: Drill bit, 90° angle indicator]

Step 1b: Hole Cleaning

Clean the drilled hole thoroughly using a brush and compressed air. Recommended air pressure is 6 bar / 90 psi. Tools such as DD EC-1 or DD 30-W are indicated for this process.

[Illustration: Brush, compressed air gun with pressure indicator]

Step 1c: Final Hole Preparation

Ensure the effective thread engagement depth (h_1,nc) is h_nom + 17mm. Verify that the minimum hole depth (h_min) minus the effective thread engagement depth (h_1,nc) is greater than 21mm (h_min - h_{1, nc} > 21mm). The diagram suggests drilling 3 times.

[Illustration: Hole depth measurement, condition h_min - h_{1, nc} > 21mm, 3x drill indicator]

Step 2a: Anchor Insertion

Insert the anchor into the prepared hole. Use a hammer [hammer] to gently tap the anchor until it is flush with the surface. Visual inspection [eye] is advised.

[Illustration: Anchor being hammered into concrete, flush with surface]

Step 2b: Anchor Setting

Set the anchor using the designated setting tool (HS-SC). The tool engages the anchor head, and arrows indicate the direction of force application.

[Illustration: Setting tool HS-SC applied to anchor]

Step 3: Nut Tightening

Tighten the nut using a wrench. The diagram shows correct tightening (✔️) and incorrect tightening (❌). An eye symbol [eye] highlights the importance of visual inspection during this step.

[Illustration: Nut being tightened, correct/incorrect indicators, eye symbol]

Step 4a: Torque Application

Apply the specified installation torque (T_inst = 20Nm) using a 13mm socket and a torque wrench [torque-wrench].

[Illustration: Torque wrench with 13mm socket]

Step 4b: Final Tightening

Perform final tightening with a power drill [power-drill] and a 13mm socket. The diagram shows the anchor head correctly seated against the fixture, with a checkmark [check] indicating proper installation.

[Illustration: Power drill with 13mm socket, properly seated anchor head]

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