084 Single-row precision roller chain

Typical Applications

1. Packaging machinery. Drives for filling lines, sealing machines, and labeling machines

2. Office equipment. Internal drives for printers and copiers    

3. Auxiliary drives for agricultural machinery. Auxiliary drives for small harvesters and seeders    

4. Textile machinery. Drives for looms and yarn-joining machines    

5. Medical equipment. Internal drives for medical devices    

6. Automation equipment. Drives for small conveyor lines and assembly lines.

Structural Features

1. Compact Design

The core feature of the 084 chain is its compact structure. While it shares the same 12.7 mm pitch as the 08B, its roller diameter (7.75 mm) and internal width (4.88 mm) are significantly smaller than those of the 08B, resulting in a more compact overall size that is suitable for power transmission applications with limited space.

2. Single-Row Structure Limitation

The 081, 083, 084, and 085 chains are available only in single-row configurations. Load capacity cannot be increased by adding additional rows; instead, it is determined by the strength of the single-row chain. If the strength of a single-row chain is insufficient during selection, a larger-sized chain (such as the 08B or 10A) must be used.

3. Sprocket Compatibility Requirements

The 084 chain must be used exclusively with 084-specific sprockets, which feature the following key characteristics:

① Type B structure: Features a single-sided hub for stable installation

② Plate-type structure: A hubless, slim design suitable for compact spaces

③ Process hole design: Reduces weight and facilitates installation and removal

Performance Features

1. Smooth operation. 

The small pitch design minimizes polygon effects, resulting in superior stability at high speeds compared to chains with larger pitches.

2. Precise transmission ratio. 

Chain drives eliminate elastic slippage and slippage, ensuring a constant transmission ratio and high transmission efficiency.

3. Excellent wear resistance. 

The sprockets undergo quenching and tempering heat treatment, resulting in high tooth hardness and significantly improved wear resistance.

4. Load Capacity. 

With a maximum tensile load of 15.6–16.0 kN, it is suitable for medium-duty applications.

5. Compact and Lightweight. 

More compact than the 08B chain with the same pitch, making it ideal for equipment with limited space.

6. Limited Interchangeability. 

Compatible only with 084 sprockets; cannot be used interchangeably with 08B sprockets.

7. No Multi-Row Options. 

No double-row or triple-row configurations are available, resulting in an upper limit on load capacity.

Material Selection

Both the chain plates and sprockets are stamped from high-quality carbon structural steel. This material offers excellent overall mechanical properties at a moderate cost, making it suitable for mass production under medium-to-low load conditions.

Manufacturing Process

① Stamping. 

The chain plates are formed using a precision stamping process to ensure accuracy in hole positioning and consistency in shape.

② Gear Milling. 

The matching sprockets are processed using advanced gear milling techniques to achieve more precise tooth profiles. The precision of the sprocket tooth profile directly affects the meshing quality between the chain and the sprocket.

③ Normalizing Heat Treatment. 

The entire sprocket undergoes normalizing heat treatment, resulting in a tooth hardness of 68–72 HRA or higher, which significantly improves overall mechanical properties and wear resistance.

④ Tooth Hardening (Optional).

Sprockets with a small number of teeth are recommended to undergo tip hardening to withstand higher meshing impacts; hardening is generally not performed on sprockets with a large number of teeth.

Surface treatments

① Blackening. 

Alkaline blackening forms a black oxide film that provides a certain level of rust prevention. (For general indoor machinery; lower cost)

② Zinc plating.

 Improves rust prevention and provides a bright appearance. (For transmission components with standard rust prevention requirements)

③ Electroless nickel plating. 

Offers superior corrosion and wear resistance; uses a non-electrolytic process, suitable for precision parts.(For applications with complex shapes and high precision requirements)

④ Phosphating. 

Forms a phosphate protective film .(as a primer for painting or for short-term rust prevention)

Installation and Maintenance

1. Sprocket Alignment.

 The drive and driven sprockets must be in the same plane; misalignment can cause uneven chain wear or derailment.

2. Chain Tension. 

The driven sprocket should be equipped with a tensioning device; the sag should be maintained at 2%–3% of the center distance.

3. Replace as a Set.

 Sprockets and chains should be replaced simultaneously; mixing new and old components will accelerate wear.

4. Regular Lubrication. 

Clean and apply lubricant regularly to extend service life.

5. Drive Sprocket Replacement Interval. 

Drive sprockets operate at higher speeds and have fewer teeth, so they wear out faster than idler sprockets; this is normal.