Nozzle Retaining Screw /Screw for nozzles

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Nozzle Retaining Screw – Product Description

Product Overview

The Nozzle Retaining Screw (also referred to as Nozzle Clamping Screw) is a critical fastening component used in hot melt adhesive dispensing equipment to secure the nozzle to the dispensing module or applicator gun. This part plays an essential role in precise positioning and reliable locking within the hot melt spray system, directly affecting spray accuracy, equipment stability, and production efficiency.

Depending on the equipment brand and module design, nozzle fastening methods generally fall into two categories:

• Clamping Screw – Uses a single‑screw clamping mechanism to secure the nozzle to the module. Commonly found on Nordson Universal™ series modules, featuring a patented single‑screw clamp mechanism that enables quick nozzle changes and fast changeovers.

• Retaining Nut – Uses a threaded nut to screw and lock the nozzle onto the front of the applicator gun. Commonly seen on ITW Dynatec®, Macon®, and other brands.

 Features

1. Precision Torque Control
The tightening torque of the nozzle retaining screw directly affects the seal integrity and service life of the module. For example, on Nordson PatternJet series, the recommended tightening torque for the nozzle clamping screw is 1.7 N·m (15 in‑lb) . Overtightening may cause module damage, while insufficient tightening can lead to adhesive leakage or spray pattern deviation.

2. Quick‑Change Design
The single‑screw clamp mechanism allows users to remove and install the nozzle by simply loosening one clamping screw. Some models are equipped with a quick‑release connection mount, replacing traditional bolted fastening and eliminating complex disassembly steps.

3. High‑Temperature and Corrosion‑Resistant Materials
Nozzle retaining screws are typically manufactured from stainless steel or surface‑treated alloy steel, capable of stable long‑term operation at hot melt operating temperatures (70°–230°C) while resisting corrosion and adhesion from adhesive residues.

4. Standardised Interface Compatibility
Nozzle retaining screws are designed to meet industry‑standard‑compatible interfaces, suitable for both direct‑mount and retaining nut‑mount applicator guns. Core components employ a standardised interface design, and the gun, nozzle, and main unit are fixed via standardised connection mounts.

Technical Specifications (Typical Values)

Application Scenarios

• Hot Melt Adhesive Equipment Maintenance – disassembly and installation during regular nozzle replacement or cleaning

• Quick Nozzle Changeover – rapid switching of nozzle types on production lines to meet different spraying process requirements

• Equipment Assembly & Repair – assembly and maintenance of dispensing modules and applicator guns

Selection Guide

When selecting a nozzle retaining screw, consider the following key points:

1. Confirm equipment brand and model – fastener specifications may vary between brands (Nordson, ITW Dynatec, Valco Melton, etc.).

2. Confirm thread size – common threads include 1/2‑24, 3/8‑24 UNF‑2B, 5/16‑24, etc.

3. Confirm fastening method – Clamping Screw or Retaining Nut.

4. Pay attention to torque requirements – always use a torque wrench and tighten to the recommended torque to avoid module damage from overtightening.