OT Copper Crimp Ring Terminals 3A–250A | Cable Wire Ends

OT Series Copper Crimp Ring Terminals – Reliable Wire Connections from 3A to 250A

Achieve secure, professional-grade electrical connections with these OT Type Copper Open Crimping Ring Terminals. Made from high-purity purple copper, these crimp connectors deliver outstanding conductivity and long-lasting durability for a wide range of wiring applications — from automotive and marine wiring to industrial panels, battery banks, and home electrical projects.

Key Features

• Wide Range of Sizes: Available in OT-3A, OT-5A, OT-10A, OT-20A, OT-30A, OT-40A, OT-50A, OT-60A, OT-80A, OT-100A, OT-150A, OT-200A, and OT-250A — covering wire gauges from 1–2.5 mm² up to large cable runs.
• High-Purity Purple Copper: Excellent electrical conductivity, corrosion resistance, and mechanical strength for dependable, long-term performance.
• Open-Barrel Design: Easy to crimp with standard crimping tools; the open ring end fits securely over bolt terminals and bus bars.
• Safe & Reliable: Low-voltage rated (below 50V AC or 75V DC); no hazardous chemicals.
• Flexible Packaging: Available in packs of 5, 10, or 50 — stock up for any job size.
• Easy to Use: Simply match the amperage rating to your wire size, insert the wire, and crimp — no soldering required.

Specifications

• Type: OT Series Crimp Ring Terminal (Open Barrel)
• Material: Purple (High-Purity) Copper
• Color: Copper
• Size Range: OT-3A to OT-250A
• Compatible Wire: OT-3A = 1–2.5 mm² wire (and up proportionally)
• Voltage Rating: Low Voltage — Below 50V AC / 75V DC
• Battery Included: No
• Made in: Mainland China

Common Applications

• Automotive & marine wiring harnesses
• Battery terminals and bus bar connections
• Industrial control panels and switchboards
• Solar panel and inverter wiring
• Home electrical and DIY wiring projects

Related Products You May Like

• 10pcs 2-Pin Spring Wire Connectors – Quick Splice Lock Terminals
• 10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips
• 12pcs 16mm Momentary Push Button Switch 1NO Metal 2-Pin Self-Reset

Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What wire size is compatible with the OT-3A copper crimp ring terminal?

A: The OT-3A terminal is designed for 1–2.5 mm² (square) wire. Each size in the OT series corresponds to a specific wire gauge range — always match the terminal amperage rating to your cable's cross-sectional area for the safest, most reliable connection.

Q: Do I need a special crimping tool for these OT copper ring terminals?

A: These OT series open-barrel ring terminals work with standard cable crimping tools readily available at hardware stores. No soldering is required — simply insert your wire and crimp firmly for a secure, professional connection.

Q: Can these copper crimp terminals be used outdoors or in automotive applications?

A: Yes. The high-purity purple copper construction offers good corrosion resistance, making these terminals suitable for automotive, marine, solar, and other demanding environments. For extremely harsh or fully exposed outdoor conditions, additional insulation or heat-shrink tubing is recommended for added protection.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.