product type 1.speed grade:type A is for conventional speed and speed of 250km/h, type B is for high speed; 2.structure type: A is for straight registration arm, B is for bending registration arm, C is for elastic structure; 3.defined conventional speed parameters: retangular tube type steady arm with stop (for for conventional speed and speed of 250km/h railway) a) the maximum tensile working load:2.5kN b) the tensile proof load:3.75kN c) breaking load ≥7.5kN retangular tube type steady arm with stop (for 350km/h high speed railway) a) the maximum tensile working load:3.0kN b) the tensile proof load:4.5kN c) breaking load≥9.0kN round tube type steady arm with stop (for conventional speed and speed of 250km/h railway) a) the maximum tensile working load:2.5kN b) the tensile proof load:3.75kN c) the compression proof load:2.5kN d) breaking load ≥7.5kN elastic steady arm with stop (for conventional speed and speed of 250km/h railway) a) the maximum tensile working load:2.5kN b) the tensile proof load:3.75kN c) compressioin proof load:2.5kN d) breaking load ≥7.5kN elastic steady arm with stop (for 350km/h high speed railway) a) the maximum tensile working load:3.2kN b) the tensile proof load:4.8kN c) compressioin proof load:3.2kN d) breaking load ≥9.6kN