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Why the thread is not continuous on hot-rolled fully thread rebars?

Author: May

Oct. 10, 2022

Mechanical Parts & Fabrication Services

Fully thread rebars are widely used for pre-stressing and post-tesnioning purposes.

The reason why it’s chosen is, despite its high mechanical properties, but also because it can fit a nut directly without screw a new thread.

WHY HOT ROLLED FULLY THREAD REBARS ARE NOT CONTINUOUSLY THREADED?

But Why these threads are not continuous?

As we all know, threads can be cut, cold-rolled, and cast. These hot-rolled pre-stressing rebars are cast by modules. During production, there are two modules cover the rod body, then the thread shape. So there are always a gap that haven’t been covered. So this is why the thread is not continuous on hot-rolled fully thread rebars. But don’t worry, the nuts can still fastened well enough.

Rolling Method: Hot rolled, Heat-treated

Grade: PSB500, PSB780, PSB830, PSB930, PSB1080

Standard: KSD3504, JIS3112,CAN/CSAG30.18-M92,BS4449-1998,ASTM615/706, DIN488-1

Diameter: regular 15, 20, 25, 28, 32, 36, 40, 50 mm or as customer’s demands

Length: As customer’s demands

Yield strength: 500/780/830/930/1080 MPa

Tensile strength: 630/980/1030/1080/1230 Mpa

Accessories: Full force hex nut, dome washer, bearing plate, coupler, nylon nut

Place of origin: China

Application: Mining, tunneling, construction,slope stabilization

Supply ability: 500 Tons per month

Steel Grade	Yield Strength MPa	Tensile Strength MPa	Elongation after Fragure A%	uniform Elongation Agt%	Stress Relaxation
Steel Grade	Yield Strength MPa	Tensile Strength MPa	Elongation after Fragure A%	uniform Elongation Agt%	Original Stress	Relaxation rate after 1000h r/%
PSB500	≥500	≥630	≥10	≥2.5	–	≤3
PSB830	≥830	≥1030	≥6	≥3.5	0.8R	≤3
PSB930	≥930	≥1080	≥6	≥3.5	0.8R	≤3
PSB1080	≥1080	≥1230	≥6	–	0.8R	≤3

Nominal Diameter, mm	Nominal Cross Section Area, mm²	Theoretical Weight. kg/m
6(6.5)	28.27(33.18)	0.222(0.260)
18	254.5	2
20	314.2	2.47
22	380.1	2.98
25	490.9	3.85
28	615.8	4.83
32	804.2	6.31
36	1018	7.99
40	1257	9.87
50	1964	15.42
Theoretical weight in this table is according to steel density 7.85g/cmm³.