CAT 116-6816 RETAINER

CAT 116-6816 is a Caterpillar shaft bearing locking retainer (threaded type), which is suitable for axial anti-loosening positioning of the inner ring of bearings in Cat 320/323 excavators, 966K loaders and other models. It is used to replace traditional nuts and locking washers, and is suitable for medium and high speed and medium axial load conditions. It is a key component for preventing loosening of bearings in transmission systems. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 116-6816, Type: Shaft threaded locking fastener, Material: 42CrMo alloy steel (surface anodized black, 240-hour salt spray rust prevention), Single weight: approx. 0.25 kg, Suitable temperature: -40℃ to +150℃, Installation method: thread pre-tightening + anti-loosening adhesive, with internal hexagonal locking hole

Key Dimensions
Suitable shaft diameter: 55 mm (shaft end thread M55×1.5 mm), Fastener inner diameter: 55 mm (thread accuracy 6g), Outer diameter: 70 mm (tolerance g6), Thickness: 8.0 mm (tolerance ±0.1 mm), Flange diameter: 75 mm, Flange thickness: 2.0 mm, Internal hexagonal hole size: 12 mm

Suitable Machine Models and Locations
Suitable for Cat 320 excavator boom bearing inner ring anti-loosening, 323 excavator stick bearing fixing, 966K Axial positioning for loader steering bearings and anti-loosening for D6T bulldozer drive wheel bearings; one piece per bearing, bearing axial load (maximum axial force ≤ 25 kN).

Performance Parameters: Rated axial load 25 kN, hardness HRC38-42, tensile strength ≥ 900 MPa, yield strength ≥ 750 MPa, thread preload torque 55-60 N・m, anti-loosening grade reaches ISO 10993, repeated disassembly/removal cycles ≥ 8 times.

Structural and Performance Advantages:

Excellent anti-loosening effect: Threaded locking structure + flange end face fits the bearing inner ring, used with anti-loosening rubber, effectively preventing loosening caused by vibration, suitable for medium and high speed operating conditions.

Precise installation and positioning: Hexagonal socket design facilitates quick installation and preload; flange end face fits the bearing inner ring, ensuring axial positioning accuracy.

Rust-resistant and durable: 42CrMo alloy steel material + anodized blackening treatment, strong rust resistance, suitable for humid and dusty construction environments, extending service life.

Highly adaptable: Adapts to various Caterpillar heavy machinery bearings, precisely matching the bearing inner ring to ensure stable operation of the transmission system.

Installation and Maintenance Points: Before installation, clean the shaft end threads, bearing inner ring, and retainer, checking for cracks and deformation. Apply medium-strength anti-loosening adhesive (such as Loctite 243) to the retainer threaded end, screw it into the shaft end threads, and pre-tighten with an Allen wrench to 55-60 N·m, ensuring a tight fit between the flange end face and the bearing inner ring.

Maintenance every 2000 hours: Check the retainer pre-tightening torque; if loose, retighten to the specified torque. Inspect the retainer surface for rust and thread wear; replace immediately if problems are found. Also check the bearing clearance to ensure it is normal.

Prioritize genuine parts. Aftermarket parts may have insufficient material strength or thread precision, easily leading to retaining failure, bearing movement, and component wear and malfunction.