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Belt fastener tension ratings indicate the maximum conveyor belt tension (in N/mm of belt width) the splice can handle. For example, a fastener rated at 800 N/mm is suitable for belts with belt pull up to 800 N per mm of width. The rating must exceed the actual belt tension at the splice location. Consult the manufacturer's selection guide which correlates belt width, thickness, and pulley diameter with fastener size and rating.

Vulcanized splices typically achieve 95-100% of original belt strength and last 3-5 years under ideal conditions. Mechanical splices achieve 80-98% of belt strength (depending on type) and typically last 1-3 years depending on belt tension, material abrasiveness, and operating conditions. For high-abrasion African mining applications, mechanical splice life of 6-18 months is common before scheduled replacement. The speed of field replacement often makes mechanical splices more economical despite shorter service life.

The most common causes of premature mechanical splice failure: incorrect fastener size for belt thickness — fasteners either pull through or don't close properly; belt tracking issues — a misaligned belt wears the splice edges; under-tightened fasteners — allow movement that fatigues the belt; over-tightened fasteners — deform the belt carcass; material carryback — abrasive material buildup between belt and pulleys accelerates fastener wear; improper skiving — insufficient cover rubber removal prevents proper fastener engagement with the carcass.