Purpose: Used for connecting the middle groove of fully mechanized mining.

Features: Simple structure, easy installation, and reliable connection.

Material: Made of high alloy steel, forged and formed, quenched and tempered, commonly used materials include 40Mn2, 40CrNiMo or 42CrNiMo, and other materials.

Mechanical performance: The dumbbell connection has a strength of up to 3000kn, making it more reliable compared to long ring connections.

Supporting quantity: Generally, the fully mechanized scraper machine is equipped with 200-300 dumbbell pins.

Scraper series: 2S06-1A, 7SD02-1 10S.  54S,  65S-06,  66S-20,  73SA-01,  86SF-01,  90S,  91S 99S-01,  101S,  107S,  111S,  113S11208-1,  125S012006-01,  126S 128S,  130S,  131S,  134S,  150S,  153S01,  159S,  1GL,  4GL01-1,  4GL04-1,  5GL02-2,  5GL03-2,  7GL3-1,  11GL3-1,  17GL3-1,  20G ,  43GL3-1,  3TY-01,  3TY-05/15GL，3TY-47,  320/17B,  Q/ZM164-1988, . Waiting and matching crossbeam bolts. E-bolt series: 54S, 90S, 90SB, 90SH, 11SJB01-5 (U-shaped), 113S, 3TY-02, 3TY-06, 3TY-48, 4GL04-1 (U-shaped), 5GL01-2, 15GL01-2, 16GL01-2, 17G (U-shaped), 21GL04-2, 36GL01-2, 43G, Northwest (M24X120), 520E, Wait. Dumbbell Pin Series: 11SJB01-2 66S, 107SA,  111S,  134S,  150S,  154S,  171S,  182S00/01-1,  196S02/01-1,  3LX01-1,  3LX02-2,  3LX06-1,  3LX09-1,  33G-1,  2LX01-1,  4LX01-1,  4LX02-1,  4LX03-1,  5LX01-1,  5LX02-1,  5LX03-1,  8LX01-1.  DYL-100, DYL-180, DYL-220, Wait. Beam series: 11GL3-1, 10S, 107S, 4GL01-2, 5GL02-2A, 5GL03-1, 5GL03-2, 5GL10-1, 15GL3-2, 25GL01-2, 30GL01-3, 32GL01-2, 35SJ06-2, BGA00-11，111S， 630/150, etc. Production and sales of connecting ring series: 18 * 64, 22 * 86, 26 * 92, 30 * 108, 34 * 126, 38 * 137 and imported 48 * 152 connecting ring.