Yielding Rock Bolt

Yielding bolt (also known as constant-resistance yielding bolt) is an active support component designed for roadways under deep high ground pressure, soft rock, large deformation and dynamic pressure. Centered on high-strength load-bearing capacity and controllable yielding, it solves the problems that conventional bolts are prone to tensile fracture and support failure.

Excellent tensile performance, capable of withstanding high ground pressure and dynamic loads.
Accommodates large deformation of surrounding rock and prevents sudden tensile fracture of the bolt.
Specially designed for deep soft rock and large-deformation roadways, ensuring high support stability.

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Diameter	Material	Tensile strength	Starting force	Constant resistance	Yield stroke	Breaking force	Preload torque	Preload	Length
φ20	MG335	≥450	120-150KN	130–160 KN	20 mm、50 mm	≥160KN	114–227 N·m	32–63 kN	1200~3000
φ20	MG400	≥540	150-182KN	160–190KN	50 mm、80 mm	≥190KN	136–271 N·m	38–75 kN	1200~3000
φ20	MG500	≥630	180–220 kN	190–230 KN	50 mm、80 mm、100 mm	≥230KN	170–339 N·m	47–94 kN	1200~3000
φ22	MG335	≥450	140–170 kN	150–180 kN	20 mm、50 mm	≥180KN	151–303 N·m	38–76 kN	1200~3000
φ22	MG400	≥540	170–200 kN	180–210 kN	50 mm、80 mm	≥220KN	181–361 N·m	46–91 kN	1200~3000
φ22	MG500	≥630	200–240 kN	210–250 kN	50 mm、80 mm、100 mm	≥260KN	226–452 N·m	57–114 kN	1200~3000
φ22	MG600	≥750	240–280 kN	250–290 kN	80 mm、100 mm、120 mm	≥320KN	272–545 N·m	68–137 kN	1200~3000
φ25	MG400	≥540	190–230 kN	200–240 kN	50 mm、80 mm、100 mm	≥265KN	236–471 N·m	59–118 kN	1200~3000
φ25	MG500	≥630	230–270 kN	240–280 kN	80 mm、100 mm、120 mm	≥310KN	294–588 N·m	74–147 kN	1200~3000