R7S 150 KSI Spin-Lock Rock Bolt
The R7S Spin-Lock incorporates a high strength post-tension steel giving the designer the highest strength to anchor diameter ratio available for use with the Spin-Lock head assembly
R7S Structural Properties
| Yield Stress |
Ultimate Stress |
Elongation in 20 Bar Dia. |
Reduction of Area |
|---|---|---|---|
| 120 KSI (827 MPa) |
150 KSI (1034 MPa) |
4% min | 20% min |
R7S 150 KSI Spin-Lock Rock Anchor
ASTM A722
| Dia & Threads per In |
Max Recommended Design Load at 2:1 Safety Factor |
Yield Strength (fy) |
Ultimate Strength (fu) |
Drill Hole Diameter (1) |
Type Head Ass’y |
Torque (ft-lbs) | Part Number |
|
|---|---|---|---|---|---|---|---|---|
| To Expand Shell (2) |
On Nut for Tension (3) |
|||||||
| 1” – 8 (25 mm) |
45.5 kips (202 kN) |
72.7 kips (324 kN) |
90.9 kips (404 kN) |
2” – (51 mm) | B 16 | 500 ft-lbs (650*) |
680 | R7S08B16 |
| 1-1/4” – 7 (32 mm) |
72.7 kips (323 kN) |
116 kips (517 kN) |
145 kips (647 kN) |
2-1/2” – (64 mm) | B 20 | 750 ft-lbs (1200*) |
Note (4) | R7S10B20 |
| 1-1/2” – 6 (38 mm) |
105 kips (469 kN) |
169 kips (750 kN) |
211 kips (937 kN) |
3” – (76 mm) | B 24 | 1000 ft-lbs (1700*) |
Note (4) | R7S12B24 |
| 1-7/8” – 8 (48 mm) |
181 kips (804 kN) |
289 kips (1286 kN) |
362 kips (1608 kN) |
3-1/2” – (89 mm) | C 28 | 1000 ft-lbs (3400*) |
Note (4) | R7S15C28 |
(*) Do not exceed these numbers
(1) Care should be taken to drill a straight and properly sized hole.
(2) A function of strata strength. More torque may be required on long anchors or in special rock conditions. Consult your Williams Representative.
(3) Torque value listed will achieve approximate load of 50% of the anchor ultimate strength, and is based on the torque tension curves here.
(4) Stress to desired tensile load using a hollow ram hydraulic jack. Consult your Williams Representative. – Inconsistencies in rock from site to site and even from hole to hole may affect anchor performances. Fissures, voids, seams, rock psi, drilling through clay or bentonite and direction of bedding planes are all possible variables. Should problems occur, consult Williams for troubleshooting.
– Spin-Locks come standard with 12” of threaded area. Other lengths available upon request.
– WILLIAMS reserves the right to ship full length or coupled units as necessary.
Head Assemblies
The Williams Spin-Lock anchor assembly gives full 300° bearing area. The smooth shell design allows for maximum shell to rock contact and eliminates “point of contact” created by serrated designs. The cone design supports the shell 300°, thereby eliminating any possible collapse of the shell under high load conditions. The thrust ring stop in front of the shell prevents any possible rebound of the expanded shell down the cone when subjected to nearby blasting. The Williams Spin-Lock anchor has been field proven on the world’s largest projects to far exceed in tension capacity any other mechanical anchor on the market.
| Head Assembly |
Drill Hole Diameter |
Bolt Diameter & Pitch |
Cone | Shell | Thrust Ring | Slip Rings |
Overall Assembly Length |
|||
|---|---|---|---|---|---|---|---|---|---|---|
| Length | Part No. | Length | Part No. | Diameter | Thickness | |||||
| B16 | 2” (51 mm) |
1” – 8 NC (25 mm) |
2-1/2” (64 mm) |
LC-200-8 | 4” (102 mm) |
LS-200 | 1-7/8” (48 mm) |
15/16″ (24 mm) |
1/16″ (1.6 mm) |
7-3/8” (187 mm) |
| B20 | 2-1/2” (64 mm) |
1-1/4” – 7 NC (32 mm) |
4” (102 mm) |
LC-250 | 4” (102 mm) |
LS-250 | 2-1/8” (54 mm) |
1-1/4″ (32 mm) |
9/64″ (3.6 mm) |
9-1/2” (241 mm) |
| B24 | 3” (76 mm) |
1-1/2” – 6 NC (38 mm) |
5-1/2” (140 mm) |
LC-300 | 5-1/2” (140 mm) |
LS-300 | 2-3/4” (70 mm) |
1-1/2″ ( 38mm) |
5/32″ (4 mm) |
12-7/8” (325 mm) |
| C28 | 3-1/2” (89 mm) |
1-7/8” – 8 UN (48 mm) |
7” (178 mm) |
LCF-350-16 | 6” (152 mm) |
LS-350 | 2-7/8” (73 mm) |
1-7/8” (48 mm) |
1/8″ (3.2 mm) |
15” (381 mm) |
Coupled Head Assemblies
Williams can manufacture Spin-Lock Anchor systems with the use of a transition coupling, which allows the anchor to be designed with a continuously workable thread-form. This is advantageous when the anchor length may need to be adjusted in the field due to variable site conditions. The transition coupling engages a continuously threaded U.N. bar into the head assembly and the All-Thread Bar (typically Grade 75 & Grade 80 All-Thread Rebar or 150 KSI All-Thread-Bar) is attached to the other end of the coupling.
C2T Stop-Type Couplings & C2D Flange Couplings
| Bar Diameter |
Outside Diameter |
Overall Length |
Stop-Type Part Number |
Flange Coupling | |
|---|---|---|---|---|---|
| Flange Size | Part Number | ||||
| 1” (25 mm) |
1-1/2” (38 mm) |
3” (76 mm) |
C2T-08 | 3” x 3” (76 x 76 mm) |
C2D-08 |
| 1-1/4” (32 mm) |
1-7/8” (48 mm) |
3-3/4” (95 mm) |
C2T-10 | 3” x 3” (76 x 76 mm) |
C2D-10 |
| 1-1/2” (38 mm) |
2-1/4” (57 mm) |
5” (127 mm) |
C2T-12 | 3” x 3” (76 x 76 mm) |
C2D-12 |
| 1-7/8” (48 mm) |
2-7/8” (73 mm) |
6” (152 mm) |
C2T-15 | – | – |
H1F Heavy Duty Hex Nuts
| Bar Diameter |
Across Flats |
Across Corners |
Thickness | Part Number |
|---|---|---|---|---|
| 1” (25 mm) |
1-5/8” (41 mm) |
1.9” (48 mm) |
63/64” (25 mm) |
H1F-08 |
| 1-1/4” (32 mm) |
2” (51 mm) |
2.3” (59 mm) |
1-7/32” (31 mm) |
H1F-10 |
| 1-1/2” (38 mm) |
2-3/8” (60 mm) |
2.7” (70 mm) |
1-15/32” (37 mm) |
H1F-12 |
| 1-7/8” (48 mm) |
2-15/16” (75 mm) |
3.4” (86 mm) |
1-27/32” (47 mm) |
H1F-15 |
R9F Hardened Washers
| Bar Diameter |
Outside Diameter |
Inside Diameter |
Thickness | Part Number |
|---|---|---|---|---|
| 1” (25 mm) |
2” (51 mm) |
1-1/16” (29 mm) |
5/32” (4 mm) |
R9F-08-436 |
| 1-1/4” (32 mm) |
2-1/2” (64 mm) |
1-3/8” (35 mm) |
5/32” (4 mm) |
R9F-10-436 |
| 1-1/2” (38 mm) |
3” (76 mm) |
1-5/8” (41 mm) |
5/32” (4 mm) |
R9F-12-436 |
| 1-7/8” (48 mm) |
3-3/4” (95 mm) |
2-1/8” (54 mm) |
7/32” (5.6 mm) |
R9F-16-436 |
R8M Beveled Washers
| Bar Diameter |
Degree of Bevel |
Outside Diameter |
Inside Diameter |
Maximum Thickness |
Minimum Thickness |
Part Number |
|---|---|---|---|---|---|---|
| 1” (25 mm) |
15° | 2-1/16” (52 mm) |
1” (25 mm) |
3/4” (19 mm) |
1/4” (6 mm) |
R8M-08S |
| 1-3/8” (36 mm) |
15° | 3-3/8” (86 mm) |
1-9/16” (40 mm) |
1-15/64” (31 mm) |
3/8” (9.5 mm) |
R8M-12S |
| 2” (51 mm) |
5° | 3-9/16” (91 mm) |
2-1/16” (52 mm) |
13/16” (21 mm) |
1/2” (13 mm) |
R8M-16 |
To achieve full strength of the nut, beveled washers must be used in conjunction with a hardened washer.
