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THB21 Filament Wound Self-lubricating Bearing with Special PTFE Fiber Lubricating Layer High Load Self-lubricating Bearings For Port Machinery. PTFE layer forms a transfer film; no oil supply needed. Static load up to 260 MPa; ideal for heavy-load oscillating motion. Low starting resistance, smooth operation. PTFE + fiber composite layer; long service life. Composite structure absorbs vibration and noise. Low thermal expansion; stable clearance, no seizure.