HILTI HST4-R (BW) M16 Wedge Anchor Operating Instructions

Product Overview

This document provides essential operating instructions and technical data for the HILTI HST4-R (BW) M16 wedge anchor. The HST4-R is a high-performance stainless steel anchor designed for secure and reliable fastening in concrete applications.

General Information and Dimensions

The HILTI HST4-R (BW) M16 anchor system is characterized by several key dimensions crucial for correct installation and performance:

• L: Overall length of the anchor.
• h_nom: Nominal embedment depth into the concrete.
• h_1: Minimum required embedment depth for installation.
• h_a: Depth of the drilled hole.
• d_f: Diameter of the anchor.
• The relationship h_1 = h + h_nom defines the minimum installation depth based on the anchor's design.

Critical minimum edge distances (c_min) and spacing between anchors (s_min) must be observed to ensure the structural integrity and load-bearing capacity of the fastening. These values are illustrated in the diagrams.

Installation Procedure

Proper installation is vital for the performance and safety of the HST4-R anchor. The process involves the following steps:

Step 1: Drilling the Hole

Drill a hole with a specified diameter (d_0) of 16 mm. The required drill hole depth (h_a) must be greater than the minimum embedment depth (h_1) plus an allowance for cleaning (e.g., h_min - h_1 > 34 mm). Ensure the drilled hole is thoroughly cleaned of dust and debris. Different drilling depths (6 mm, 20 mm, 6 mm, 10 mm) are indicated for specific installation requirements.

Installation may involve various Hilti drilling systems such as DD EC-1, DD 30-W, DD 150-U, or TE-CD/TE-YD systems, often operating at 6 bar / 90 psi.

Step 2: Inserting the Anchor

Insert the HST4-R anchor into the cleaned and prepared drill hole. Ensure the anchor is fully seated and aligned correctly.

Step 3: Setting the Anchor

The anchor is set by tightening the hexagonal nut. This action expands the wedge mechanism at the base of the anchor, creating a secure mechanical interlock with the concrete. A tool like HS-SC might be used for initial positioning or to assist in the setting process.

Step 4: Final Tightening

Apply the specified installation torque (T_inst) to the anchor nut to achieve the final secure fastening. For the HST4-R M16 anchor, a torque of 120 Nm is required. This is typically achieved using a calibrated torque wrench or an appropriate impact driver, such as the HILTI SIW 6AT-22 with an SI-AT-22 (AT Module), ensuring the nut is tightened to 24 mm.

Technical Data Table

The following table provides key technical data, including recommended embedment depths (h_nom) and corresponding tightening torque ranges (t_fix,max and t_fix,min) for various anchor lengths (L) of the HST4-R M16 anchor.

Note: The table provides torque values in Nm. Always refer to the latest HILTI technical documentation for precise load capacities and application guidelines.