SN-2549S Ratchet Crimping Tool 0.08-1.0mm² AWG28-18 JST Dupont Terminals

🔧 SN-2549S Ratcheting Open Barrel Terminal Crimping Tool | AuscomTech

The SN-2549S is a precision ratcheting crimping tool designed for attaching open barrel terminals to electrical wires ranging from 0.08 to 1.0mm². It provides a practical solution for assembling custom connector cables, repairing wiring harnesses and creating secure electrical connections.

Featuring a multi-size crimping die, ratcheting mechanism and ergonomic red and blue handles, this tool is suitable for working with a variety of small electronic connector terminals commonly used in Arduino projects, ESP32 development, robotics, 3D printers and general electronics.

Unlike basic crimping pliers, the ratcheting mechanism helps maintain controlled pressure throughout the crimping cycle, producing more consistent connections when used with correctly matched terminals and wire sizes.

⭐ Key Features

• Ratcheting Crimp Mechanism – Helps deliver consistent compression and secure terminal connections through a controlled crimping cycle.
• Multi-Size Crimping Die – Four crimping positions accommodate wire cross-sections from 0.08 to 1.0mm².
• Open Barrel Terminal Compatibility – Suitable for many compatible JST-style, Dupont, Molex-style and other uninsulated connector contacts.
• Wide Connector Support – Can be used with suitably sized terminals from PH2.0, XH2.54, SM2.54, KF2510, 2.8mm, 3.0mm and 3.96mm connector families.
• Carbon Steel Construction – Durable metal crimping mechanism designed for repeated electronics assembly and repair work.
• Ergonomic Handles – Red and blue non-slip grips provide comfortable handling and improved control during repetitive crimping tasks.
• Precision Crimping Jaws – Shaped die profiles help form terminal conductor and insulation support wings around appropriately sized wires.
• Compact Hand Tool – Approximately 190mm long, suitable for electronics workbenches, repair kits and portable toolboxes.
• Manual Operation – No batteries, external power or specialised equipment required.

📊 Technical Specifications

• Model: SN-2549S
• Tool Type: Ratcheting open barrel terminal crimping pliers
• Crimping Capacity: 0.08–1.0mm²
• Wire Gauge: AWG 28–18 (manufacturer stated)
• Die Positions: 4
• Die Sizes: 0.08 / 0.25 / 0.5 / 1.0mm²
• Mechanism: Manual ratcheting
• Body Material: Carbon steel
• Handle Style: Straight ergonomic grips
• Handle Colours: Red and blue
• Overall Length: Approximately 190mm
• Weight: Approximately 350g

🔌 Compatible Terminal Types

• JST PH2.0: Compatible open barrel contacts used in compact electronic assemblies.
• JST XH2.54: Crimp contacts commonly used for PCB connections, battery balancers and control boards.
• JST SM2.54: Male and female contacts used in wire-to-wire connector assemblies.
• Dupont 2.54mm: Male and female contacts used for jumper wires, development boards and electronic prototyping.
• KF2510: Suitable contacts used in 2.54mm pitch connector housings.
• 2.8mm / 3.0mm / 3.96mm: Selected open barrel connector contacts within the tool’s crimping capacity.
• Molex-Style Connectors: Selected compatible open barrel pin and socket terminals.

📏 Crimping Die Size Guide

• 0.08mm²: Approximately AWG 28–26
• 0.25mm²: Approximately AWG 26–24
• 0.5mm²: Approximately AWG 22–20
• 1.0mm²: Approximately AWG 20–17

These ranges are based on the manufacturer’s die markings. Actual suitability depends on the terminal dimensions, conductor size and insulation diameter. Select the die position that produces a correctly formed crimp without damaging the contact.

🧩 Typical Applications

• Arduino and ESP32 jumper cable assembly
• 3D printer wiring harness construction and repair
• Robotics and RC electronics wiring
• PCB connector cable fabrication
• Battery balance lead and low-voltage cable assembly
• Sensor and microcontroller connection cables
• DIY electronics prototyping and development
• Automotive low-voltage signal wiring using suitable contacts
• Electronic equipment servicing and connector replacement

⚠️ Important Notes

• This tool is designed for compatible open barrel, uninsulated crimp terminals. It is not intended for standard insulated red, blue or yellow electrical crimp connectors.
• Connector series compatibility does not guarantee suitability for every terminal within that series. Always check the contact’s crimp barrel dimensions.
• The pitch of a connector housing does not determine the required crimp die size.
• The advertised 0.08–1.0mm² capacity refers to wire conductor cross-sectional area, not the overall insulated wire diameter.
• The manufacturer-stated AWG range is approximate. Use the terminal manufacturer’s recommended wire and tooling specifications where available.
• A correctly completed crimp should securely grip the conductor and support the insulation without cutting strands or excessively deforming the terminal.
• For critical electrical connections, inspect the finished crimp and perform an appropriate pull test before installation.
• Connector housings, crimp terminals and wires are not included.

📦 Package Includes

• 1 × SN-2549S Ratcheting Open Barrel Terminal Crimping Tool

🔗 Recommended Accessories (Not Included)

• JST XH2.54 Connector Kits – Housings and crimp contacts for PCB and electronic cable assemblies.
• Dupont 2.54mm Connector Kits – Male and female pins with housings for Arduino, ESP32 and breadboard jumper cables.
• JST PH2.0 / SM2.54 Connector Kits – Contacts and housings for compact wire-to-board and wire-to-wire connections.
• Precision Wire Stripper – Prepares wire ends by removing insulation before terminal crimping.