40-Pin Header Connector Kit, 2.54mm Single Row Male, PCB Pin Strip for Arduino, 12-Pack, Multi-Color

Overview
This 40-pin header connector kit is a practical assortment of single-row, 2.54mm pitch male pin strips designed for everyday electronics prototyping and PCB assembly. Each strip is a straight, through-hole style header that can be “breakaway” cut to the exact pin count you need—perfect for Arduino-compatible boards, sensor breakouts, DIY modules, and general-purpose perfboard builds. The included multi-color strips make it easier to visually separate power rails, communication buses, and GPIO groups, reducing wiring mistakes during rapid iteration.

Technical Details
These headers use the common 0.1 inch (2.54mm) pin spacing found across breadboards, prototyping PCBs, and many development boards. The single-row format is widely used for:
- Creating removable module connections (male header on module, female header on carrier board)
- Soldering pin strips onto breakout boards to interface with Dupont-style jumpers
- Repairing or replacing damaged headers on development boards and shields
- Building custom adapters where pin count and spacing must match standard 2.54mm ecosystems

Because the strips are breakaway, you can cut them to length using flush cutters or a precision shear. For best results, cut between pins and lightly dress the cut edge if needed. When soldering, ensure the header is held square to the PCB to maintain consistent mating with female sockets or breadboards. Use a temperature-controlled iron and appropriate solder for your PCB finish; dwell time should be minimized to avoid softening the plastic insulator.

Specifications
- Product type: Single-row male pin header strips (breakaway)
- Pitch: 2.54mm (0.1 inch)
- Pins per strip: 40 pins each
- Row configuration: 1x40 (single row)
- Mounting style: Through-hole, straight
- Color: Multi-color assortment (exact colors/quantities may vary by batch)
- Total quantity: 12 strips (12-pack)
- Compatibility: 2.54mm female headers, breadboards, perfboard/protoboard, Dupont jumper connectors (2.54mm)
- Electrical ratings: Not specified; check datasheet for your chosen header standard if you require certified current/voltage limits
- Materials/plating: Not specified; plating type and thickness may vary by supplier batch—verify if your application requires gold plating or specific corrosion resistance

Applications
- Arduino and compatible boards: adding or replacing GPIO headers, shield interconnects, and module pins
- Sensor and RF modules: soldering male headers to breakout boards for breadboard testing
- Prototyping: quick interconnects on perfboard/stripboard and custom interface boards
- Repairs: replacing bent, oxidized, or broken header pins on development kits and DIY electronics
- Cable and adapter builds: creating pin-to-wire harness interfaces using 2.54mm housings and crimp contacts

Integration Notes
- Cutting to length: Use flush cutters; cut slowly to avoid cracking the plastic carrier. If you need a perfectly straight edge, cut one pin longer and snap to finish.
- Alignment: Insert the header into a breadboard or a matching female socket while soldering to keep it perpendicular to the PCB.
- Mating fit: 2.54mm systems are standardized, but tolerances can vary; test-fit with your target female header or connector housing before final assembly.
- Signal integrity: For high-speed signals, keep lead lengths short and consider ground referencing and routing practices on your PCB; headers are best suited for low-to-moderate speed interconnects typical of hobby and maker projects.

Included Components: 12x 40-pin 2.54mm single-row male header strips (multi-color)