DIN 981 Slotted Round Nut

Wanluo’s China DIN 981 Slotted Round Nut solves common mechanical problems such as shaft end displacement, bearing looseness and axial runout during equipment operation, achieving high-precision fixed limiting and anti-loosening effects for rotating shaft parts. It is a core precision fastener for transmission machinery, bearing assembly and automated spindle systems.

Structural Slot Design & Mechanical Stability

DIN 981 Slotted Round Nut adopt a solid circular integral structure with precisely milled symmetrical open slots on the outer circumference. The unique slotted structure allows direct locking and loosening via special hook wrenches, enabling precise fine-tuning of pre-tightening force during shaft assembly. The full-circle thread body provides uniform axial stress, effectively eliminating eccentric pressure and ensuring concentricity of shaft parts after locking. Processed through precision turning and thread rolling, the internal thread features high matching accuracy and smooth screwing performance. Premium stainless steel material delivers outstanding wear resistance and structural stability, maintaining long-term precise locking accuracy during high-speed rotation and cyclic operation of mechanical shafts.

Product Parameter

Core Functions & Mechanical Application Advantages

1. Professional circular shaft locking structure perfectly matches mechanical spindles, bearing inner rings and threaded shafts, achieving accurate axial limit and effectively preventing component displacement during high-speed rotation.

2. Reserved side locking slot design supports adjustable pre-tightening force via professional hook tools, realizing fine calibration of assembly clearance, which is irreplaceable for precision mechanical debugging compared with ordinary nuts.

3. Full-circle uniform stress structure avoids local pressure deviation, protecting shaft surface accuracy and roundness, ensuring stable rotation precision and low jitter of transmission equipment.

4. High-density stainless steel material features excellent wear resistance and fatigue resistance, adapting to long-term high-speed operation and alternating load working conditions, reducing mechanical failure rate caused by loose shaft parts.

5. Strict dimensional tolerance control ensures high-precision matching with standard shaft parts, widely used in precision machine tools, transmission equipment, hydraulic machinery and bearing assembly systems.

Product Actual Performance Test Standard

All our standard and customized hardware DIN 981 Slotted Round Nut will pass the following universal factory performance tests before delivery:

✅ Material Composition Test : Detect metal material content to meet carbon steel, alloy steel and stainless steel material standards

✅ Dimensional Tolerance Test : Check size, thread specification and assembly tolerance to ensure perfect fitting

✅ Mechanical Load Test : Tensile test, breaking load test, static pressure and impact resistance test (Core test for all lifting and fastening parts)

✅ Surface Anti-Corrosion Test : Salt spray test, rust resistance detection for galvanized and passivated products

✅ Fatigue Resistance Test : Long-term reciprocating load test for repeated use industrial hardware

We can provide formal factory test reports and support designated third-party institution testing according to customer requirements.