Hot-rolled Continurous Thread Rock Bolt

There are 2 types of rock bolt with different raw materials – Hot Rolled Threaded Rebar and Rebar with Thread Rolling Process. Threaded rebar can be directly used with nut with no thread rolling process, it only need to be cut to length; for rebar with no continuous thread, thread rolling and inspection is needed. Bolt Nut used for threaded rebar and thread deformed bar is also different, which is decided by thread dimension. Rock Bolt with Hot Rolled Continuous Thread Rebar and Heat Treated Thread Deformed Bar can be used in most applications with no difference.

 

Continurous Threaded Rebar Rock Bolt Types:

 

Dimensions of Threaded Rebar Rock Bolt

Diameter	dh/mm		dv/mm		h/mm		b/mm		I/mm		r/mm	a
/mm	Size	Tolerance I	Size	Tolerance	Size	Tolerance	Size	Tolerance	i Size |	Tolerance
15	147	±0.2	14,4	±0.5	1.0	±0.2	4.2	±0.3	10.0	±0.2	0.5	78.5*
20	20.0	±0.4	20.0	+0.4-0.8	1.3	±0.3	4.8	±0.5	10.0		1.2	80.5
25	250		25.0	+0.4-0.8	1.6		6.0		12.0		1.5	81*
32	32.0	±0.5	32.0	+0.5-1.2	2.0	±0.4	7.0		16.0		2.0	81.5*
36	36.0		36.0		2.2	±0,4	8.0		18.0	±0.3	2.5	81.5
40	40.0		40.0		2.5	±0.5	8.0		20.0		2.5	81.5*
50	50.0		50.0		3.0	-0.5	9.0		24.0		2.5	81.8
63.5	63.5		63.5		3.0	±0.6	12.0		22.0	±0.4	2.5	84*

 

Mechanical Property of Threaded Rebar Rock Bolt

Mechanical Properties
Diameter /mm	Cross- sectional area/mm2	Weight (kg/m)	PSB830				PSB930				PSB1080
			Min Yield Stress/Load		Min Utimate Stress/Load		Min Yield Stress/Load		Min Utimate Stress/Load		Min Yield Stress/Load		Min Utimate Stress/Load
			Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN
15	177	1.4	830	147	1030	182	930	165	1080	191	1080	191	1230	218
20	314	2.47	830	261	1030	323	930	292	1080	339	1080	339	1230	386
25	491	4.1	830	408	1030	506	930	457	1080	530	1080	530	1230	604
32	804	6.65	830	667	1030	828	930	748	1080	868	1080	868	1230	989
36	1018	8.41	830	845	1030	1049	930	947	1080	1099	1080	1099	1230	1252
40	1257	10.34	830	1043	1030	1295	930	1169	1080	1358	1080	1358	1230	1546
50	1963	16.28	830	1629	1030	2022	930	1826	1080	2120	1080	2120	1230	2414
Elongation at fracture A/%			≥7				≥7				≥6
Total Elongation at max force Agt/%			≥3.5
Relaxation at 1000h			≥4
Modulus of elasticity/Mpa			2*10^5

 

Length Chart of Threaded Rebar Rock Bolt

Dia (mm)	Length of Bar (L mm)
	1400	1600	1800	2000	2200	2400	2600	2800	3000
16	–	+	+	+	+	–	–	–	–
18	–	+	+	+	+	–	–	–	–
20	–	+	+	+	+	–	–	–	–
22	–	+	+	+	+	–	–	–	–
25	–	+	+	+	+	–	–	–	–
Note: 1. + means precedence length 2. According to customers requirements, other specific length are available

 

Threaded Rebar Rock Bolt Application