91mm Knife Main Knife Back Spring Internal Spring Back Shrapnel Sak Parts Tool

Restore full function to your 91mm SAK-style knife with this internal back spring, designed specifically for the main knife blade layer. Also known as the internal spring shrapnel, this essential part ensures your main blade opens smoothly and locks with firm, reliable tension — perfect for repairs, mods, or full restorations.

✅ Product Details:

• Part Type: Back spring (internal spring/shrapnel for main blade)
• Compatibility: Fits 91mm SAK-style multi-tools
• Material: Hardened stainless steel – heat-treated for strength and durability
• Function: Applies blade tension, supports safe open/close mechanism
• Includes: 1x Internal Back Spring only

🌟 Why Choose This Back Spring?

• Reliable Tension: Restores original snap and blade stability
• Precision Fit: Designed for standard 91mm tool stack alignment
• Essential Component: A must-have for main blade functionality
• Durable Steel: Engineered to withstand continuous use

🛠️ Perfect For:

• 91mm SAK main blade restorations
• Custom builds requiring exact-fit back springs
• Knife repair kits and spare part inventories
• Modders looking to rebuild from the core

✨ Bring your 91mm SAK knife back to life with a genuine-style internal back spring — engineered for strength, fit, and function.

👉 Add this critical replacement part to your toolkit today.