Description
CAT 521-9967 BALL-STE-SEM
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CAT 521-9967 SEM is a Caterpillar genuine ball end stud, suitable for ball joint connections in articulated parts of engineering machinery. The following is purely accurate information (without additional description):
Core Parameters and Information
Item Details
Part Model: CAT 521-9967 SEM (5219967) Ball End Stud
Part Type: External thread ball end stud, used for ball joint connections in articulated structures, transmitting loads and achieving angular deflection
Material: 42CrMo alloy steel, tempered and rolled, hardness HRC33-38, Dacromet coating, salt spray test ≥500h
Key Dimensions: Thread M24×2 (6g tolerance), thread length 50mm; ball end diameter 38mm (R19), ball end radius of curvature 19mm; total length 120mm; shank diameter 24mm, ball end neck fillet R5
Structural Features: One-piece ball end, no oil passages (suitable for grease lubrication), ball end surface roughness… Ra≤0.8μm, thread tail chamfer 1×45°
Matching: Clearance fit with ball joint seat (0.020-0.030mm), thread preload torque 280-300N・m, operating temperature -40℃ to +120℃
Lubrication Requirements: Grease lubrication (CAT MOLY-D No. 2 lithium-based grease), lubrication cycle 500 working hours
Compatible Models and Assemblies:
Loaders: CAT 966M, 972M (boom connecting rod ball joint)
Excavators: CAT 349GC, 352GC (stick connecting rod ball joint)
Graders: CAT 140M, 160M (scraper connecting ball joint)
Matching Parts: 521-9967 ball stud, 521-9968 ball joint seat, 8T-4125 retaining ring, lock nut (e.g.) 108-3456), Dust Cover (431-5968)
Installation and Fitting Points:
Clean the threaded and ball head surfaces, ensuring no burrs or oil contamination. The inner roughness of the ball head seat should be Ra≤1.6μm, and the threads should be undamaged.
Apply CAT threadlocker to the threads and pre-tighten to a torque of 280-300 N·m. Tighten evenly in stages using a torque wrench.
After installation, check that the ball head deflection angle is ±15° without jamming, and the gap between the ball head and the ball head seat is 0.020-0.030 mm.
Install the dust cover and add grease, ensuring the ball head area is fully grease-filled to prevent dust from entering.
