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S-9 Undercut Concrete Anchor Installation
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S9U Undercutting Tool
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This tool is required for undercutting the holes to accommodate the S-9 Undercut Anchor. Designed to be attached to concrete coring equipment and apparatus with water flushing capabilities. Specifications available on request. Special length undercut tools can be manufactured upon request.
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Typical Undercut Tools in Stock
Bar
Diameter |
Cone
Migration
into Shell |
Distance per
Revolution |
Part
Number |
1/4" - 20 UNC
(6.4 mm) |
0.4140"
(10.52 mm) |
0.0500"
(1.27 mm) |
8 to 10 |
3/8" - 16 UNC
(10 mm) |
0.6040"
(15.34 mm) |
0.0625"
(1.59 mm) |
9 to 11 |
1/2" - 13 UNC
(12 mm) |
0.7191"
(18.27 mm) |
0.0769"
(1.95 mm) |
9 to 11 |
5/8" - 11 UNC
(16 mm) |
1.097"
(27.86 mm) |
0.0909"
(2.31 mm) |
12 to 14 |
3/4" - 10 UNC
(20 mm) |
1.189"
(30.20 mm) |
0.1000"
(2.54 mm) |
11 to 13 |
1" - 8 UNC
(25 mm) |
1.174"
(29.82 mm) |
0.1250"
(3.18 mm) |
9 to 11 |
1-1/4" - 7 UNC
(32 mm) |
1.622"
(41.20 mm) |
0.1428"
(3.63 mm) |
11 to 13 |
1-1/2" - 6 NC
(38 mm) |
3.044"
(77.32 mm) |
0.1667"
(4.23 mm) |
18 to 20 |
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Torque Setting Chart
Bar
Diameter |
Standard
Embedment
Range |
Part
Number |
1/4" - 20 UNC
(6.4 mm) |
Up to 5"
(127 mm) |
S9U-02H |
3/8" - 16 UNC
(10 mm) |
Up to 6-1/2"
(165 mm) |
S9U-03H |
1/2" - 13 UNC
(12 mm) |
Up to 8"
(203 mm) |
S9U-04H |
5/8" - 11 UNC
(16 mm) |
Up to 10"
(254 mm) |
S9U-05H |
3/4" - 10 UNC
(20 mm) |
Up to 12-1/4"
(311 mm) |
S9U-06H |
1" - 8 UNC
(25 mm) |
Up to 15-1/2"
(394 mm) |
S9U-08H |
1-1/4" - 7 UNC
(32 mm) |
Up to 21"
(533 mm) |
S9U-10H |
1-1/2" - 6 NC
(38 mm) |
Up to 27-1/2"
(699 mm) |
S9U-12H |
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S9T - A-193 B7Bar - Torque Tension Chart
All data based on greased (MolyCoat Gn) threads and surfaces
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Larger diameter anchors should be set and tensioned using a hydraulic test jack.
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S-9 Undercut Concrete Anchor Installation
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| Step 1 |
Step 2 |
Step 3 |
| Before starting the undercutting procedure, be sure the hole is drilled to the proper diameter and depth (2 x bolt dia.). Attach the undercutting tool to the core drill and be sure there is an adequate flow of water through the tool. |
Insert the tool into the hole until the bearing stop contacts the concrete. |
Turn the core drill handle downward with slow even motion until the cutter blades are fully extended. The cutter blades are fully extended when the gap at the top between the innershaft and outerhousing make contact. |
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| Step 4 |
Step 5 |
Step 6 |
| Conical shape is undercut with Williams Undercutting Tool attachment. |
Anchor and sleeve are inserted into hole. |
Anchor is jacked or torqued to draw the cone up into the shell, therefore opening the shell into the undercut hole. |
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S-9 Undercut Flush Mount Concrete Anchor Installation
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Williams also offers a flush mount S-9 Undercut Bearing Anchor that carries all the advantages of the standard S-9 , but adds the ease of installing in special conditions such as heavy machinery or large weldments. Refer to S-9 Undercut Anchor Installation (page 24) for instructions on undercutting the drill hole, steps 1-4. After hole is undercut, proceed as shown below in steps 1-5. |
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| Step 1 |
Step 2 |
Step 3 |
| Attach expansion template and stud extension to anchor. Check for proper anchor embedment by measuring assembled set-up. |
Insert anchor set-up assembly into drill hole. Set embedment to include expansion template. Template allows clearance for S-9 flush mount coupling. |
Attach test coupling and test rod of center hole test jack to stud extension. Tension to set anchor head to load specified for anchor. |
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| Step 4 |
Step 5 |
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| Remove ram and setting tools and install couple to offset per the following chart. Anchor installation is complete and ready for attachments. |
After stud rods, bolts, washers or assemblies are installed, torque hex nut to required tension or tension with hydraulic jack to working load. |
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S-9 Flush Mount Undercut Concrete Anchor Data
Bar
Diameter |
Minimum
Embedment |
Offset |
Coupling |
| Diameter |
Length |
3/8" - 16 UNC
(10 mm) |
4-1/8"
(105 mm) |
3/8"
(10 mm) |
3/4"
(20 mm) |
2-1/4"
(57 mm) |
1/2" - 13 UNC
(12 mm) |
6"
(152 mm) |
3/8"
(10 mm) |
3/4"
(20 mm) |
2-1/4"
(57 mm) |
5/8" - 11 UNC
(16 mm) |
7-1/2"
(191 mm) |
3/8"
(10 mm) |
1"
(25 mm) |
3"
(76 mm) |
3/4" - 10 UNC
(20 mm) |
9-1/4"
(235 mm) |
1/2"
(12 mm) |
1-1/16"
(27 mm) |
3"
(76 mm) |
1" - 8 UNC
(25 mm) |
12-1/2"
(318 mm) |
5/8"
(16 mm) |
1-1/2"
(38 mm) |
4-1/4"
(108 mm) |
1-1/4" - 7 UNC
(32 mm) |
16"
(406 mm) |
3/4"
(20 mm) |
1-7/8"
(48 mm) |
5-5/8"
(143 mm) |
1-1/2" - 6 NC
(38 mm) |
21-1/2"
(546 mm) |
1"
(25 mm) |
2-1/4"
(57 mm) |
8-5/8"
(219 mm) |
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Calibration and Maintenance of S-9 Undercutting Tool
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| Calibrating Blade Width |
Setting Cutter Depth |
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To calibrate the maximum width of the blades of the undercut tool, Loosen hex socket set screw on upper ring. Turn ring clockwise for larger dimension or counter clockwise for smaller dimension of cutter width. Tighten hex socket set screw. |
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To set cutter depth, loosen hex socket set screw on lower ring and slide bearing stop to proper position (Embedment depth + 1/8"). Tighten hex socket set screw. |
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Blade Replacement |
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Cutter blades are to be replaced when they no longer can be adjusted to tolerances when fully opened. |
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| Hold the undercutting tool securely (Vise or second person). Use a punch and hammer to tap out lower pin. |
Depress the top of intershaft of the tool until upper pin lines up with the hole in the tool. Tap out the upper pin. |
To replace the cutter blades, just reverse the procedure beginning with the lower pin. Be sure the diamond inserts on the cutters face outward. |
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 Williams Form Engineering Corp. All rights reserved. |
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