Tsubaki Drive Chains - Tsubakimoto Chain - #10

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Fig. 4 Summary chart of repetitive load 9 T S U B A K I D R I V E C H A I N Glossary This is the minimum tensile strength determined by ANSI Standard. If a roller chain breaks from a tensile load below this value, then it is non-compliant. In the case of multi-strand roller chain, the single strand value is multiplied by the number of strands. (ANSI B 29.100) This is a fracture load reading obtained after a long period of actual tensile strength testing of a large number of chain strands. Naturally, a roller chain may actually break at a higher or lower value than this, so it does not represent a guaranteed value. This value varies depending on the manufacturer. As shown in Fig. 2, roller chain with over five links is fixed at both ends by clevises and is stretched until breakage occurs (JIS B 1801-2009). The type of fracture is indicated by breakage of the roller chain or failure of its parts (Fig. 3.) This is a minimum value determined by statistical processing at Tsubaki. If any roller chain fractures by a tensile load below this value, then it is noncompliant. This value varies depending on the manufacturer. Note that strength of offset links may be lower than the chain itself. (Refer to each product page for details.) The maximum allowable load of roller chain (excluding Stainless Steel Chain and Engineering Plastic Chain*) is the value derived from the lowest fatigue limit. When a load lower than this value is repetitively applied to the roller chain, fatigue failure will never occur. Tsubaki standards and catalog values are for 107 repetitions, or 2Pa. In other words, if Tsubaki’s maximum allowable load is indicated as maximum load (Pmax), then values in this catalog would increase 10%. According to the former JIS B 1801-1997, the maximum allowable load indicates a breakage load of Pmax = (Pm + Pa) = 2.2Pa at a frequency of 5 × 106, when a new roller chain with over five links receives a repetitive load in linear operation. (Fig. 4) Tsubaki minimum tensile strength Average tensile strength JIS minimum tensile strength Fig. 1 Relationship between three tensile strengths Fig. 2 Tensile strength test Fig. 3 Shape of fracture * Stainless steel and engineered plastic chains: Maximum allowable load is determined from specifying the surface pressure between pins and bushes based on wear performance. Frequency Tensile strength Time Load 1. ANSI Standard Minimum Tensile Strength (Tensile Breakage Strength) 2. Tsubaki Average Tensile Strength 3. Tsubaki Minimum Tensile Strength Testing Method 4.Maximum Allowable Load Before Use For Safe Use Standard Roller Chains Lube-Free Roller Chains Heavy Duty Roller Chains Corrosion Resistant Roller Chains Specialty Roller Chains Accessories Selection Handling