Bucket Tips 208-5235 201-1235 Earth Moving Equipment Spare Parts

What are the common types of pins

The common types and characteristics of pins are as follows:

1. Positioning pins

Cylindrical pin ‌

Cylindrical structure, used to fix the relative position between parts, transmit torque or serve as an overload protection element.

Interference fit (tolerance ±0.02mm) is required, and the surface roughness should be ≤Ra0.4μm to ensure positioning accuracy.

Applicable scenarios ‌ : combined processing, assembly positioning (such as machine tool guideways).

Conical pin ‌

The 1:50 standard taper design ensures self-locking and anti-loosening after insertion, and its repeat positioning accuracy is higher than that of cylindrical pins.

Installation requires reaming to a depth of 80% to 85% for the pin insertion, with a 2-3mm space reserved at the head for tightening.

Applicable scenarios ‌ : frequently disassembled parts (such as mold alignment).

Ii. Connecting pins

Cotter ‌

U-shaped elastic structure. After insertion, the tail end can be pried open to lock the position, preventing loosening but prone to deformation when disassembled.

It is mostly used for fixing bolts and shaft parts (such as preventing loosening of wheel nuts).

Elastic cylindrical pin (slot pin) ‌

Rolled steel parts with longitudinal grooves generate elastic self-locking on the extrusion hole walls, which have strong anti-vibration capabilities.

Supports repeated disassembly and assembly, and has low requirements for hole accuracy.

Pin shaft ‌

It is combined with a cotter pin to form a hinge connection, which is convenient for installation and disassembly and highly reliable.

Typical application ‌ : joint connection of construction machinery arm.

Iii. Special Function Pins

Safety pin ‌

It breaks preferentially when overloaded (hardness 30-36HRC) to protect the core transmission components.

Pin sleeves are often added to prevent premature compression failure.

Type B spring pin ‌

Made of spring steel, it automatically pops open and locks after insertion. It can be repeatedly disassembled and is easy to operate.

Substitution trend ‌ : gradually replacing traditional cotter pins (such as agricultural machinery pin shaft fixation).

Bereso ‌

The end is equipped with a safety card slot, specifically designed for truss connections, with a shear resistance of ≥800MPa.

The installation direction should be standardized in layers according to the number of rows (for example, for inner rows, insert from the inside out).

Iv. Thread Derivative Types

Internal thread cylindrical pin ‌

Diameter ≥6mm, with threaded holes at the tail for easy disassembly of blind holes.

Screw tail cone pin ‌

The conical and threaded composite design combines high positioning accuracy with vibration resistance.

Note ‌ : The selection should take into account the positioning accuracy (cylindrical/conical pins), disassembly and assembly frequency (B-type pins/elastic pins), and working condition load (safety pins/bailey pins).