Bucket Wear Parts 7Y0357 Earth Moving Equipment Spare Parts

Definition of pitch for construction machinery chains

The core definition and technical key points of the pitch of construction machinery chains are as follows:

The definition of chain pitch is ‌

The chain pitch refers to the distance between the center points of the same side busbars of two adjacent rollers in the tensioned state ‌ (unit: millimeters /mm). This parameter is the core benchmark for chain design, directly affecting transmission matching, load-bearing capacity and service life.

The engineering significance of pitch ‌

Transmission fit ‌

The pitch must precisely match the tooth profile of the sprocket (deviation ≤1%), otherwise it will cause tooth skipping and abnormal wear.

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Example: 08B chain pitch 12.7mm → Matched with sprockets of the same pitch

Load-bearing capacity is associated with ‌

The pitch is positively correlated with the ultimate tensile load, for example

04C-1 chain ‌ : pitch 6.35mm → maximum load 3.5kN

32B chain ‌ : pitch 50.8mm → ultimate load 250.4kN

Size system standard ‌

Mainstream standard pitch comparison

Chain number ‌ ‌ pitch (mm)‌ ‌ applicable scenario ‌

25 (ANSI) 6.35 Precision Component transmission

40 (ANSI) 12.7 conveyor, medium-sized equipment

20A (GB) 31.75 Crane main drive chain

32B (ISO) 50.8 heavy-duty chain for mining machinery

(Insert the model comparison table and scene examples here)

Special specification notes ‌

The pitch deviation of the sprocket ‌ : the actual pitch of the sprocket should have an error of no more than 0.1% with the chain; otherwise, it will accelerate wear.

Non-standard design ‌ : The pitch of the mining chain can reach up to 92mm (such as the 26×92mm model), suitable for extremely heavy loads.

(Illustration shows the measurement method of roller center distance and the influence of pitch deviation)

Key points for selection ‌

When choosing the pitch, it is necessary to confirm synchronously:

Roller diameter (affecting wear resistance, for example, the diameter of 16B roller is 15.88mm)

Inner section inner width (determined by the gap with the chain plate, for example, the inner width of a 12A chain is 11.68mm)

Application scenario classification

Light load ‌ (<3kN) : Select small-section chain (e.g. 03B/6.35mm)

Heavy load ‌ (>100kN) : select large pitch chains (e.g. 24B/38.1mm)

Warning ‌ : It is strictly prohibited to mix chains of different standards (such as ANSI and ISO) in construction machinery, as this may lead to meshing failure.