PMK Precision Locknuts — PSR Series are compact, high‑strength clamping nuts engineered for accurate axial locking and repeatable preload in small to large rotating assemblies. The PSR family is optimized for applications that demand compact form factor, precise bearing positioning, and reliable resistance to loosening under vibration.

PSR locknuts are offered in many metric sizes and pitches (from M6×0.5 up to M300×4.0 equivalents in the dataset), with purpose‑designed bolt patterns (2–3 radial screws or threaded holes) and machined seating faces to minimise runout. They are manufactured from high‑strength alloy steel and finished for corrosion resistance, providing durable, reusable clamping in production and toolroom environments.

Key benefits

• Performance: reliable axial locking with rated axial capacities from ~17 kN (small sizes) up to ~2,800 kN (largest sizes), suitable for light bearings through extremely heavy‑duty shafts.
• Precision: ground seating faces and tight thread tolerances ensure repeatable bearing preload and minimal axial displacement.
• Compactness: slim axial heights (from ~8 mm upward) make PSR ideal where axial space is constrained.
• Secure fastening: designed bolt patterns (2–3 radial screws or threaded fixing) deliver uniform clamping torque and excellent resistance to vibration‑induced loosening.
• Range: torque ratings span ~3.5 Nm up to 60 Nm (depending on size), matched to axial capacity and thread pitch for safe installation.

Applications

• Bearing and spindle clamping in CNC machine tools and spindles.
• Ball screw end locking, rotary table and indexing drives.
• Precision automation, robotics joints, and small‑ to large‑shaft assemblies.
• Heavy machinery and presses (larger PSR sizes).
• OEM and retrofit use where repeatable axial positioning and low runout are required.