21700 Insulator Rings – 550pcs Adhesive

Precision-fit 21700 battery insulator rings made from heat‑resistant fish paper with a peel‑and‑stick adhesive backing. Designed to sit perfectly on the positive terminal of 21700 cells to help prevent shorts during spot welding and pack assembly.

• Perfect fit for 21700 cells – sized to prevent sliding or misalignment.
• Adhesive backing – easy peel & stick; speeds up assembly and stays put under weld pressure.
• Durable fish paper – high dielectric strength and heat resistance.
• Ideal for DIY pack builders – e‑bikes, power tools, robotics, and energy storage projects.

Specifications
Material: Fish paper (adhesive-backed)
Outer Diameter: 19.8 mm (approx.)
Inner Diameter: 10.5 mm (approx.)
Thickness: 0.2 mm (approx.)
Quantity: 550 pieces per pack