SKU: UBM990-6818-2L
MPN: 990-6818-2L
The U-B Machine 11/16in Left-Hand Steel Jam Nut (Part No. 990-6818-2L) is a precision fastening component designed for firearms, suppressors, and tactical equipment that require secure, vibration-resistant assembly. This jam nut is essential in high-recoil environments where standard fasteners may loosen under sustained firing or mechanical stress.
Manufactured from hardened steel, this jam nut provides the mechanical lock-force necessary to prevent backing out during repeated firing cycles and thermal cycling. The 11/16-inch diameter ensures compatibility with standard threaded applications commonly found in both mil-spec and commercial firearm platforms. Its left-hand threading is specifically designed for counter-rotational locking, making it ideal for suppressor mounts and adjustable components.
Law enforcement and military armorers rely on U-B Machine jam nuts for their durability and effectiveness in suppressor tube assemblies and muzzle devices. The left-hand configuration ensures that forward-firing recoil impulses tighten rather than loosen the assembly, which is critical for maintaining accuracy and component longevity in tactical operations.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
