FIELD: railway transport; track tools for tightening nuts of rail butt joints. SUBSTANCE: wrench has working heads 1 and 2 mounted on handle 3 and torque attachment mounted on head 2 and consisting of body 4 with rigidly fitted in bushings 6 and 8. One bushing has internal thread in two which bolt 7 with calibrated knurling is turned, and pusher with roller is installed in other bushing. Spring 5 is placed between bushings. Retainer 12 engages with wrench head 2. Retainer has shaped surface for rolling over pusher roller. EFFECT: enlarged operating capabilities. 2 cl, 2 dwg
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