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Ground Anchor Systems
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150 KSI All-Thread-Bar

Threaded
Bar Types
150 KSI
Information
150 KSI
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Case
Histories
Corrosion
Protection
150 KSI All-Thread-Bar
Structural Properties
Yield Stress
Ultimate Stress
127.7 KSI
(880.5 MPa)
150 KSI
(1034 MPa)
Elongation in
20 bar diameters
Reduction
of Area
4%
20% min.
150 KSI All-Thread-Bar
Unique Thread Form
R71 150 KSI All-Thread-Bar - ASTM A722
Nominal
Bar
Diameter
Minimum
Net Area
Thru Threads
Minimum
Ultimate
Strength
Prestressing Force
Nominal
Weight
Approx.
Thread
Major Dia.
Part
Number
0.80f pu A 0.70f pu A 0.60f pu A
1" - 4
(25 mm)
0.85 in2
(549 mm2)
128 kips
(567 kN)
102 kips
(454 kN)
89.3 kips
(397 kN)
76.5 kips
(340 kN)
3.09 lbs./ft.
(4.6 Kg/M)
1-1/8"
(29 mm)
R71-08
1-1/4" - 4
(32 mm)
1.25 in2
(807 mm2)

188 kips
(834 kN)

150 kips
(667 kN)

131 kips
(584 kN)

113 kips
(500 kN)

4.51 lbs./ft.
(6.71 Kg/M)

1-7/16"
(37 mm)
R71-10
1-3/8" - 4
(36 mm)
1.58 in2
(1019 mm2)

237 kips
(1054 kN)

190 kips
(843 kN)

166 kips
(738 kN)

142 kips
(633 kN)

5.71 lbs./ft.
(8.50 Kg/M)

1-9/16"
(40 mm)
R71-11
1-3/4" - 3-1/2
(45 mm)
2.60 in2
(1664 mm2)

390 kips
(1734 kN)

312 kips
(1388 kN)

273 kips
(1214 kN)

234 kips
(1041 kN)

9.06 lbs./ft.
(13.5 Kg/M)
2"
(51 mm)
R71-14
2-1/4"" - 3-1/2
(57 mm) **
4.08 in2
(2632 mm2)

613 kips
(2727 kN)

490 kips
(2181 kN)

429 kips
(1909 kN)

368 kips
(1636 kN)

14.1 lbs./ft.
(20.8 Kg/M)

2-1/2"
(64 mm)
R71-18
2-1/2" - 3
(65 mm)
5.19 in2
(3350 mm2)

778 kips
(3457 kN)

622 kips
(2766 kN)

545 kips
(2422 kN)

467 kips
(2074 kN)

18.2 lbs./ft.
(27.1 Kg/M)

2-3/4"
(70 mm)
R71-20
3" - 3
(75 mm) **
6.46 in2
(4169 mm2)

969 kips
(4311 kN)

775 kips
(3448 kN)

678 kips
(3018 kN)

581 kips
(2587 kN)

22.3 lbs./ft.
(32.7 Kg/M)

3-3/64"
(78 mm)
R71-24
Effective cross sectional areas shown are as required by ASTM A722-07. Actual areas may exceed these values.
ACI 355.1R section 3.2.5.1 indicates an ultimate strength in shear has a range of .6 to .7 of the ultimate tensile strength. Designers should provide adequate safety factors for safe shear strengths based on the condition of use.
Per PTI recommendations for anchoring, anchors should be designed so that:
-
The design load is not more than 60% of the specified minimum tensile strength of the prestressing steel.
- The lock-off load should not exceed 70% of the specified minimum tensile strength of the prestressing steel.
- The maximum test load should not exceed 80% of the specified minimum tensile strength of the prestressing steel.
** The 2-1/4" and 3" diameter bars are not covered under ASTM A722.

Properties
Williams 150 KSI bars are manufactured in strict compliance with ASTM A722-07 and AASHTO M275 Highway Specifications. The prestressing steel is high in strength yet ductile enough to exceed the specified elongation and reduction of area requirements. Selected heats can also pass the 135° supplemental bend test when required. Testing has shown Williams 150 KSI All-Thread-Bars to meet or exceed post tensioning bar and rock anchoring criteria as set by the Post Tensioning Institute including dynamic test requirements beyond 500,000 cycles of loading.

Williams 360° continuous thread deformation pattern has the ideal relative rib area configuration to provide excellent bond strength capability to grout or concrete, far better than traditional reinforcing deformation patterns.

Threads
All-Thread-Bars are cold rolled threaded to close tolerances under continuous monitoring procedures for quality control. Threads for Williams 150 KSI bar are specially designed with a rugged thread pitch wide enough to be fast under job site conditions and easy to assemble. They also have a smooth, wide, concentric, surface suitable for torque tensioning. This combination offers tremendous installation savings over inefficient, hot rolled, non-concentric thread forms. Threads are available in both right and left hand.

Williams All-Thread-Bars are threaded around the full circumference enabling the load transfer from the bar to the fasteners to occur efficiently without eccentric point loading. Williams fasteners easily meet the allowable load transfer limitations set forth by the Post Tensioning Institute. Williams 150 KSI All-Thread-Bars and fasteners are machined to tight tolerances for superior performance and mechanical lock. Precision machining greatly reduces concern of fastener loosening or detensioning. 150 KSI bars meet or exceed the deformation requirements under ASTM A615 for concrete reinforcing bars. Williams special thread deformation pattern projects ultra high relative rib area, much greater than conventional rebar. This provides for superior bond performance in concrete.

Steel Quality
Williams 1”, 1-1/4”, & 1-3/8” 150 KSI bars are smooth, hot rolled, high strength prestressing steel. The bars are cold-stressed and stress relieved to produce the above properties. The 1-3/4” through 3” 150 KSI bars are from an alloy based steel that is hot rolled, quenched-tempered and stress relieved. All bars are produced to the prescribed mechanical properties shown in ASTM A722-07.

Thorough inspection and traceability are carried out during all phases of manufacturing to assure the highest standards of quality. Mill certifications and certificates of conformance can be provided with each shipment as an assurance that the mechanical properties of Williams All-Thread-Bar are as shown.

Cutting (No Welding)
Williams 150 KSI All-Thread-Bar should not be subjected to the heat of a torch, welding or used as a ground. Field cutting should be done with an abrasive wheel or band saw.
Tensile Strength & Working Loads
Williams 150 KSI bars are available with ultimate tensile strengths and working loads as displayed above. Safety factors and functional working loads are at the discretion of the project design engineer, however test loads should never exceed 80% of the published ultimate bar strength.
Williams Form Engineering Corp.
Threaded
Bar Types
150 KSI
Information
150 KSI
Accessories
Case
Histories
Corrosion
Protection
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