What the NN400 Conveyor Belt Is
The NN400 Conveyor Belt is a multi-ply fabric core belt built with nylon (NN) warp and weft cords. The designation indicates a nominal tensile strength of 400 N/mm per ply, and the belt is normally manufactured with two to six plies depending on the duty. It belongs to the broader family of NN Conveyor Belt products and is often chosen where a Fabric Core Conveyor Belt offers a practical balance of strength, flexibility, and spliceability compared with heavier alternatives such as a Steel Cord Conveyor Belt.
Construction and Materials
In a typical NN400 Conveyor Belt, the nylon fabric plies are bonded with rubber skim compounds and protected by top and bottom cover rubber. Common cover combinations include 4+2 mm, 5+2 mm, and 6+2 mm, with thicker covers used in abrasive service. The carcass remains flexible, which helps the belt trough well on conventional idler roller arrangements and run smoothly around conveyor pulleys. Buyers can specify cover grades such as Abrasion Resistant Conveyor Belt, Heat Resistant Conveyor Belt, Flame Retardant Conveyor Belt, or Oil Resistant Conveyor Belt compounds when the duty calls for them.
Common Belt Dimensions
Widths and thicknesses are selected according to the conveyor design rather than fixed rules. The table below lists reference values that appear in normal inquiries; final dimensions are confirmed by the manufacturer.
| Parameter | Typical reference values |
|---|---|
| Belt width | B500, B650, B800, B1000, B1200, B1400, B1600, B1800, B2000 |
| Cover thickness (top + bottom) | 3+1.5 mm, 4+2 mm, 5+2 mm, 6+2 mm, 8+3 mm |
| Number of plies | 2 to 6 plies |
| Nominal strength per ply | 400 N/mm |
These values are reference data, not universal specifications. A wider belt does not automatically dictate a particular pulley diameter, and shaft dimensions are always determined by the conveyor designer.
Where NN400 Belts Are Used
The NN400 Conveyor Belt is common in mining, coal preparation, cement plants, power stations, quarries, and sand and aggregate yards. It handles bulk materials such as crushed rock, ore, clinker, and coal on primary and secondary conveyors. In a Coal Mining Conveyor Belt installation, flame-retardant grades may be specified, while a Quarry Conveyor Belt or Aggregate Conveyor Belt often uses abrasion-resistant covers. The belt runs over idler rollers and conveyor pulleys, with conveyor brackets and frames supporting the idler sets, and it can be supplied as an Endless Conveyor Belt where a vulcanized joint is preferred.
Selection and Maintenance Notes
- Match cover grade to the duty: abrasion, heat, oil, or flame resistance as required.
- Confirm belt width, ply count, and cover thickness with the conveyor design, not by habit.
- Check that pulley diameters and trough idler angles suit the belt carcass.
- Inspect splices, edges, and idler roller condition regularly to avoid premature wear.
For related bulk handling equipment, buyers may also review conveyor pulley and idler roller options at www.example.com/conveyor-pulley and www.example.com/idler-roller, or compare fabric core and steel cord constructions before finalizing a specification. A properly specified NN400 Conveyor Belt, combined with suitable pulleys, idlers, and brackets, supports reliable operation in demanding industrial environments.
