Loctite 561 Thread sealant Controlled Strength 19g Stick 561-019G/LOCTITEWhite, semi solid methacrylate stick thread sealant, ideal toolbox product for all metal fittings that wont spill or leak. NSF approved. LOCTITE 561 is an white, semi solid methacrylate thread sealant stick, an ideal toolbox product for maintenance and repair that wont spill or leak. Fast, reliable curing on metal, tapered pipe threads and fittings with a thread size up to M80 R3; its breakaway torque rating is 2Nm. This is a low strength product for