Williams Form Engineering Corp. Williams Form Engineering Corp.
Williams Form Engineering Corp.
DownloadsDownloadsWhat's NewContact UsAbout UsWilliams Form Engineering Corp.
Ground Anchor Systems
Concrete Anchor Systems
Post Tensioning Systems
Threaded Bars with Fasteners
Tie Rods & Tie Backs
Micro Piles
Concrete Forming Hardware Systems
Williams products are made in the USA

S9 Undercut Concrete Anchor System

S9 Undercut
Information
Parts &
Accessories
S9 Undercut
Installation
Installation
Equipment
Case
Histories
Corrosion
Protection
Williams S-9 Undercut Bearing Anchor was designed to eliminate the direct lateral stress found in the setting of conventional anchors and to bring its characteristics closer to those of cast-in-place anchors. Through the use of Williams undercutting tool, along with Williams undercut anchor, the conical shape of the anchor fits into the conical cut of the hole. This produces a positive expansion anchoring system that develops the tensile capacity of the bolt without slip or concrete failure. Because the anchor head is larger than the drill hole size, a properly embedded anchor will consistently develop 100% of the ASTM A193 Grade B7 bolting material. S-9 Undercut Concrete Anchor in an Undercut Hole
S-9 Undercut Concrete Anchor
S-9 Undercut Concrete Anchor
S-9 Undercut Concrete Anchor
S-9 Undercut Concrete Anchor

Advantages of Williams Undercut Anchor

  • Cyclic Loading in Cracked Concrete - In situations where the diameter of the hole is increased due to changes caused by nature, the S-9 Undercut Bearing Anchor withstands cyclic loads in the cracked concrete member because the undercut of the hole is much larger than the top of the hole.
  • High Levels of Preload - Williams high strength stud bolt is threaded the total length of the bar to provide uniform stress throughout the bolt. When combined with Williams undercut head assembly the product is an anchor which will retain a much higher preload than a standard friction anchor.
  • Vibratory Loads - Throughout the destructive testing on Williams undercut anchor there has been consistent ductile failure on the stud bolt demonstrating a high reliability of safety. Therefore the S-9 Undercut anchor may be used safely with vibration equipment and piping.
S-9 Undercut Concrete Anchor - ASTM A193 Grade B7
Diameter
& Threads
per Inch
Maximum
Factored
Design Load
Yield
Strength
(fy)
Ultimate
Strength
(fu)
Drill Hole
Diameter
Minimum
Embedment
(3000 PSI - f’c)
Minimum
Embedment
(6500 PSI - f’c)
Part
Number
1/4” - 20
(6.4 mm)
2.98 kips
(13.3 kN)
3.34 kips
(14.9 kN)
3.98 kips
(17.7 kN)
5/8”
(16 mm)
3”
(77 mm)
2”
(51 mm)
S9T-02
3/8” - 16
(9.5 mm)
7.27 kips
(32.3 kN)
8.14 kips
(36.2 kN)
9.69 kips
(43.1 kN)
7/8”
(22 mm)
5”
(127 mm)
4”
(102 mm)
S9T-03
1/2” - 13
(13 mm)
13.3 kips
(59.2 kN)
14.9 kips
(66.3 kN)
17.7 kips
(78.9 kN)
7/8”
(22 mm)
8”
(204 mm)
6”
(153 mm)
S9T-04
5/8” - 11
(16 mm)
21.2 kips
(94.2 kN)
23.7 kips
(105 kN)
28.2 kips
(125 kN)
1-1/8”
(29 mm)
10”
(254 mm)
8”
(204 mm)
S9T-05
3/4” - 10
(19 mm)
31.3 kips
(139 kN)
35.1 kips
(156 kN)
41.8 kips
(186 kN)
1-1/8”
(29 mm)
13”
(331 mm)
10”
(254 mm)
S9T-06
1” - 8
(25 mm)
56.8 kips
(253 kN)
63.6 kips
(283 kN)
75.8 kips
(337 kN)
1-5/8”
(41 mm)
19”
(483 mm)
15”
(381 mm)
S9T-08
1-1/4” - 7
(32 mm)
90.8 kips
(404 kN)
102 kips
(453 kN)
121 kips
(539 kN)
2”
(51 mm)
26”
(661 mm)
20”
(508 mm)
S9T-10
1-1/2” - 6
(38 mm)
132 kips
(586 kN)
148 kips
(656 kN)
176 kips
(781 kN)
2-1/2”
(64 mm)
33”
(839 mm)
25”
(635 mm)
S9T-12
These loads are valid where embedment is sufficient to assure steel failure; that is concrete shear cone strength is greater than steel strength.
Minimum ultimate static tension values based on physicals of ASTM A193 Grade B7 bolting material having 125,000 PSI minimum ultimate strength.
Structural Properties
Yield
Stress
Ultimate
Stress
Elongation in
20 Bar Dia
Reduction
of Area
Charpy at
-40? F (-40? C)
105 KSI
(723 MPa)
125 KSI
(861 MPa)
16% min 50% min 20 ft/lbs
(27 Joules)
Stainless S-9 Undercut Concrete Anchors
Presented below are four different stainless steel options for the S-9 Undercut Concrete Anchor. Generally, the Stainless 304 B8 Class 1 and the Stainless 316 B8M Class I S-9 Undercut Concrete Anchors are the least expensive and most readily available of the Stainless Steels. The Stainless 304 B8 Class II S-9 boasts the highest strength among the Stainless Steels, while the 316 B8M Class II S-9 provides the combination of high strength and the highest level of corrosion resistance.
Stainless S-9 Undercut Anchor - ASTM A193 304 B8 & 316 B8M Class I
Diameter
& Threads
per Inch
Maximum
Factored
Design Load
Yield
Strength
(fy)
Ultimate
Strength
(fu)
Drill Hole
Diameter
Minimum
Embedment
(3000 PSI - f’c)
Minimum
Embedment
(6500 PSI - f’c)
Part
Number
1/4” - 20
(6.4 mm)
0.95 kips
(4.23 kN)
0.95 kips
(4.23 kN)
2.39 kips
(10.6 kN)
5/8”
(16 mm)
2”
(51 mm)
2”
(51 mm)
S9T-02-S4
S9T-02-S6
3/8” - 16
(9.5 mm)
2.32 kips
(10.3 kN)
2.32 kips
(10.3 kN)
5.81 kips
(25.8 kN)
7/8”
(22 mm)
4”
(102 mm)
3”
(77 mm)
S9T-03-S4
S9T-03-S6
1/2” - 13
(13 mm)
4.26 kips
(18.9 kN)
4.26 kips
(18.9 kN)
10.6 kips
(47.3 kN)
7/8”
(22 mm)
5”
(127 mm)
4”
(102 mm)
S9T-04-S4
S9T-04-S6
5/8” - 11
(16 mm)
6.78 kips
(30.2 kN)
6.78 kips
(30.2 kN)
16.9 kips
(75.2 kN)
1-1/8”
(29 mm)
7”
(178 mm)
6”
(153 mm)
S9T-05-S4
S9T-05-S6
3/4” - 10
(19 mm)
10.0 kips
(44.6 kN)
10.0 kips
(44.6 kN)
25.1 kips
(111 kN)
1-1/8”
(29 mm)
9”
(229 mm)
7”
(178 mm)
S9T-06-S4
S9T-06-S6
1” - 8
(25 mm)
18.2 kips
(80.9 kN)
18.2 kips
(80.9 kN)
45.5 kips
(202 kN)
1-5/8”
(41 mm)
14”
(356 mm)
11”
(280 mm)
S9T-08-S4
S9T-08-S6
1-1/4” - 7
(32 mm)
29.1 kips
(129 kN)
29.1 kips
(129 kN)
72.7 kips
(323 kN)
2”
(51 mm)
18”
(458 mm)
14”
(356 mm)
S9T-10-S4
S9T-10-S6
1-1/2” - 6
(38 mm)
42.2 kips
(188 kN)
42.2 kips
(188 kN)
105 kips
(469 kN)
2-1/2”
(64 mm)
23”
(585 mm)
18”
(458 mm)
S9T-12-S4
S9T-12-S6
These loads are valid where embedment is sufficient to assure steel failure; that is concrete shear cone strength is greater than steel strength.
NOTE: All diameters SS S-9 - ASTM A193 - 304 B8 & 316 B8M Class 1 Max Factored Design Loads are limited to the yield strength per Section R17.4.1.2 of ACI 318.
Structural Properties
Yield
Stress
Ultimate
Stress
Elongation in
20 Bar Dia
Reduction
of Area
30 KSI
(207 MPa)
75 KSI
(517 MPa)
30% min 50% min
Stainless S-9 Undercut Concrete Anchor - ASTM A193 304 B8 Class II
Diameter
& Threads
per Inch
Maximum
Factored
Design Load
Yield
Strength
(fy)
Ultimate
Strength
(fu)
Drill Hole
Diameter
Minimum
Embedment
(3000 PSI - f’c)
Minimum
Embedment
(6500 PSI - f’c)
Part
Number
1/4” - 20
(6.4 mm)
2.98 kips
(13.3 kN)
3.18 kips
(14.1 kN)
3.98 kips
(17.7 kN)
5/8”
(16 mm)
3”
(77 mm)
2”
(51 mm)
S9T-02-S42
3/8” - 16
(9.5 mm)
7.27 kips
(32.3 kN)
7.75 kips
(34.5 kN)
9.69 kips
(43.1 kN)
7/8”
(22 mm)
5”
(127 mm)
4”
(102 mm)
S9T-03-S42
1/2” - 13
(13 mm)
13.3 kips
(59.2 kN)
14.2 kips
(63.1 kN)
17.7 kips
(78.9 kN)
7/8”
(22 mm)
8”
(204 mm)
6”
(153 mm)
S9T-04-S42
5/8” - 11
(16 mm)
21.2 kips
(94.2 kN)
22.6 kips
(101 kN)
28.2 kips
(126 kN)
1-1/8”
(29 mm)
10”
(254 mm)
8”
(204 mm)
S9T-05-S42
3/4” - 10
(19 mm)
31.3 kips
(139 kN)
33.4 kips
(149 kN)
41.8 kips
(186 kN)
1-1/8”
(29 mm)
13”
(331 mm)
10”
(254 mm)
S9T-06-S42
1” - 8
(25 mm)
48.4 kips
(215 kN)
48.4 kips
(215 kN)
69.7 kips
(310 kN)
1-5/8”
(41 mm)
18”
(458 mm)
14”
(356 mm)
S9T-08-S42
1-1/4” - 7
(32 mm)
63.0 kips
(280 kN)
63.0 kips
(280 kN)
102 kips
(453 kN)
2”
(51 mm)
23”
(585 mm)
18”
(458 mm)
S9T-10-S42
1-1/2” - 6
(38 mm)
70.2 kips
(312 kN)
70.2 kips
(312 kN)
141 kips
(625 kN)
2-1/2”
(64 mm)
28”
(712 mm)
22”
(559 mm)
S9T-12-S42
These loads are valid where embedment is sufficient to assure steel failure; that is concrete shear cone strength is greater than steel strength.
NOTE: 1”, 1-1/4” & 1-1/2” diameter SS S-9 - ASTM A193 - 304 B8 Class 2 Max Factored Design Loads are limited to the yields strength per Section R17.4.1.2 of ACI 318.
Structural Properties
Diameter
Range
Yield
Stress
Ultimate
Stress
Elongation in
4 Bar Dia
Reduction
of Area
1/4” - 3/4"
(6.4 to 19 mm)
100 KSI
(690 MPa)
125 KSI
(861 MPa)
12% min 35% min
1”
(25 mm)
80 KSI
(552 MPa)
115 KSI
(793 MPa)
15% min 35% min
1-1/4”
(32 mm)
65 KSI
(448 MPa)
105 KSI
(724 MPa)
20% min 35% min
1-1/2”
(38 mm)
50 KSI
(375 MPa)
100 KSI
(670 MPa)
28% min 45% min
Stainless S-9 Undercut Concrete Anchor - ASTM A193 316 B8M Class II
Diameter
& Threads
per Inch
Maximum
Factored
Design Load
Yield
Strength
(fy)
Ultimate
Strength
(fu)
Drill Hole
Diameter
Minimum
Embedment
(3000 PSI - f’c)
Minimum
Embedment
(6500 PSI - f’c)
Part
Number
1/4” - 20
(6.4 mm)
2.63 kips
(11.7 kN)
3.05 kips
(13.6 kN)
3.50 kips
(15.6 kN)
5/8”
(16 mm)
3”
(77 mm)
2”
(51 mm)
S9T-02-S62
3/8” - 16
(9.5 mm)
6.39 kips
(28.4 kN)
7.44 kips
(33.1 kN)
8.53 kips
(37.9 kN)
7/8”
(22 mm)
5”
(127 mm)
4”
(102 mm)
S9T-03-S62
1/2” - 13
(13 mm)
11.7 kips
(52.1 kN)
13.6 kips
(60.6 kN)
15.6 kips
(69.4 kN)
7/8”
(22 mm)
7”
(178 mm)
5”
(127 mm)
S9T-04-S62
5/8” - 11
(16 mm)
18.6 kips
(82.9 kN)
21.7 kips
(96.5 kN)
24.9 kips
(110 kN)
1-1/8”
(29 mm)
9”
(229 mm)
7”
(178 mm)
S9T-05-S62
3/4” - 10
(19 mm)
27.6 kips
(123 kN)
32.1 kips
(143 kN)
36.7 kips
(163 kN)
1-1/8”
(29 mm)
12”
(305 mm)
9”
(229 mm)
S9T-06-S62
1” - 8
(25 mm)
45.4 kips
(202 kN)
48.5 kips
(216 kN)
60.6 kips
(269 kN)
1-5/8”
(41 mm)
16”
(407 mm)
13”
(331 mm)
S9T-08-S62
1-1/4” - 7
(32 mm)
63.0 kips
(280 kN)
63.0 kips
(280 kN)
92.0 kips
(409 kN)
2”
(51 mm)
22”
(559 mm)
17”
(432 mm)
S9T-10-S62
1-1/2” - 6
(38 mm)
70.2 kips
(312 kN)
70.2 kips
(312 kN)
126 kips
(562 kN)
2-1/2”
(64 mm)
26”
(660 mm)
21”
(534 mm)
S9T-12-S62
These loads are valid where embedment is sufficient to assure steel failure; that is concrete shear cone strength is greater than steel strength.
NOTE: 1-1/4” & 1-1/2” diameter SS S-9 - ASTM A193 - 316 B8M Class 2 Max Factored Design Loads are limited to the yield strength per Section R17.4.1.2 of ACI 318.
Structural Properties
Diameter
Range
Yield
Stress
Ultimate
Stress
Elongation in
4 Bar Dia
Reduction
of Area
1/4” - 3/4"
(6.4 to 19 mm)
96 KSI
(662 MPa)
110 KSI
(861 MPa)
15% min 45% min
1”
(25 mm)
80 KSI
(552 MPa)
100 KSI
(670 MPa)
20% min 45% min
1-1/4”
(32 mm)
65 KSI
(448 MPa)
95 KSI
(655 MPa)
25% min 45% min
1-1/2”
(38 mm)
50 KSI
(375 MPa)
90 KSI
(621 MPa)
30% min 45% min
Williams Form Engineering Corp.
S9 Undercut
Information
Parts &
Accessories
S9 Undercut
Installation
Installation
Equipment
Case
Histories
Corrosion
Protection
Contact Us Home
Williams Form Engineering Corp. All rights reserved.