R thread self-drilling anchor bolt system is composed of a hollow rock bolt, anchor nut, anchor plate, anchor coupler, drill bit, centralizer, and the hollow anchor bars can be cut and lengthened by coupling on request.

Functions:
R thread self-drilling anchor bolt system is an advanced system that can ensure the anchoring effect for complex ground conditions. It can be integrated with the functions of drilling, grouting, and anchoring.

Conditions:
• Tunneling
• Mining
• Slope Stabilization
• Foundation Support


Features and advantages:
1. Safe, reliable, and time-saving.
2. Simple installation & operation.
3. Choice of drill bits for different ground conditions.
4. Grouting works synchronize with drilling or after drilling. Grout can fill fractures effectively.
5. Anchor bars can be cut and lengthened on request, applying to narrow spaces.
6. It provides higher bonding stress than smooth steel pipe depending on continuous wave thread.

Technical Data:




    Hollow Bar

Size	Outer Dia. (mm)	Ultimate Load (kN)	Yield Load (kN)	Weight (Kg/m)
SER25N	25	200	150	2.35

    Coupler

Size	Outer Dia. (mm)	Length (mm)	Weight (Kg/pc)	Note
SSR25	36	150	0.66	With sealing structure
SER25	36	150	0.68	Without sealing structure

    Hex Nut

Size	Key Size (mm)	Length (mm)	Weight (Kg/pc)	Note
SSR25	41	30	0.20	Heat treatment
SER25	41	35	0.23	Without heat treatment

    Domed Nut

Size	Key Size (mm)	Length (mm)	Weight (Kg/pc)	Note
SER25	41	40.5	0.31	Without heat treatment

    Domed Plate

Size	Dimensions (mm)	Thickness (mm)	Hole Dia. (mm)	Weight (Kg/pc)
SER25	150×150	8	30	1.40
	150×150	5	28	0.85
	200×200	10	32	3.20

    

    Drill Bit

Size	Outer Dia. (mm)	Application Range (Advice)
EX			Sand, fills, gravel
SSR25/42	42
SSR25/51	51
EXX			Softer sedimentary rocks such as marls, mudstones, siltstone
SSR25/42	42
SSR25/51	51
ES-F			Gravel, soft rock
SSR25/42	42
SSR25/51	57.5
ESS-F			Weathered rock, stone walls, rubble
SSR25/42	42
SSR25/51	51
EY			Competent ground, strong rock
SSR25/51	51