Fully Insulated Spade Terminal FDFD1-250 Male and Female Plug Spring Connectors for 10-12AWG 4-6mm2 Wire Automotive and Marine Electrical Docking Temperature Control Red Yellow 50 Pairs
Fully Insulated Spade Terminals for 10-12AWG Wire and Vehicle Wiring

This set of fully insulated male and female spade terminals is designed for making push-on wire connections in automotive, maritime, and temperature control wiring. The terminals fit 10-12AWG / 4-6mm2 wire and use a plug spring docking design, so the male and female ends connect without soldering. Each terminal has an insulated sleeve that covers the connection area, supporting an isolated and sealed join. The set contains 50 male and 50 female crimp terminals, with red and yellow colour options and model options 1 250 and 5 250. The female connector measures approximately 22x9x6mm, the male connector measures approximately 20x6x5mm, and the output diameter is approximately 3.5mm. These are practical terminals for routine electrical work where a simple, repeatable connection method is needed.
Features and Construction

The terminals are built around a push-on docking method that suits wiring tasks in vehicles, boats, and control equipment. The insulated design covers the connection point, and the stated wire range is 10-12AWG / 4-6mm2. The set is supplied without retail packing, so it is best suited to trade users or anyone who stores electrical parts in a workshop or tool kit.
Material and Build
The source describes these as fully insulated crimp terminals with an isolated and sealed connection. The insulation covers the terminal body and the docking point, which supports use in applications where the join needs to be covered rather than left exposed. The male and female parts are shaped to push together, and the crimp end accepts 10-12AWG / 4-6mm2 wire. No further material composition is stated, so the practical details here are limited to the insulated construction and the wire range provided.
Size and Practical Fit
The female connector measures approximately 22x9x6mm, while the male connector measures approximately 20x6x5mm. The output diameter is approximately 3.5mm. These dimensions make the terminals suitable for compact wiring spaces where a standard spade connection is required. Manual measurement means a 1-3mm variation is possible, so exact sizing should be checked against the intended connection point before fitting. Model options are 1 250 and 5 250, and colour options are red and yellow.
Uses and Placement

These terminals are intended for 10-12AWG / 4-6mm2 wire and are listed as suitable for maritime transport and automotive applications. They can also be used in temperature control wiring where a male and female plug connection is needed. The push-on design allows the connection to be docked and separated without soldering, which is useful during assembly, testing, or maintenance.
Event or Professional Use
For automotive and maritime work, the terminals support wiring runs that need a covered connection point. The insulated sleeve helps isolate the join, and the spade shape allows the male and female ends to dock securely. The 50-pair set provides enough terminals for multiple connections, making it useful for workshop stock or larger wiring tasks. The stated suitability for maritime transport and automotive applications is the main professional context supported by the source.
Everyday Home Use
For home electrical tasks, these terminals can be used where 10-12AWG / 4-6mm2 wire needs a push-on connection. They are relevant for temperature control wiring and other low-voltage connection points that accept a spade terminal. The insulated cover helps keep the join isolated, and the male and female parts can be docked by hand after crimping. No retail packing is included, so they are supplied as loose terminals for storage in a toolbox or parts drawer.
Benefits and Buying Value

The main value of this set is the combination of insulated male and female terminals in one quantity of 50 pairs. The push-on docking method avoids soldering, and the stated wire range covers 10-12AWG / 4-6mm2. Colour and model options allow the user to select red or yellow and 1 250 or 5 250. Because the source does not provide pricing, performance ratings, or competitor comparisons, the buying value is limited to the supplied quantity, dimensions, and stated applications.
Reuse and Low Maintenance
The male and female terminals can be docked and separated as needed, which supports repeated assembly and testing where the connection is not permanently joined. The insulated sleeve covers the connection point, and the crimp end secures the wire. No specific maintenance instructions are given in the source, so care should be based on the stated materials and the conditions of the application. Keeping the terminals dry and free from damage is a reasonable low-risk approach.
Why Choose This Product
This set is a practical choice when 10-12AWG / 4-6mm2 wire needs an insulated male and female spade connection. It offers 50 male and 50 female crimp terminals, red and yellow colour options, and model options 1 250 and 5 250. The dimensions are stated for both halves, and the terminals are listed as suitable for maritime transport, automotive, and temperature control wiring. Manual measurement error of 1-3mm and monitor colour differences are noted, and no retail packing is included.