Redhead Trubolt

The Redhead trubolt is a wedge anchor manufactured by ITW RedHead and sold under the brand name of Trubolt.  All Trubolt wedge anchors feature a stainless steel expansion clip. The anchor body is manufactured from carbon steel that is zinc plated or hot-dipped galvanized, or 304 and 316 stainless steel.  All types of Trubolt wedge anchors can be purchased on-line at www.confast.com or by calling 888-498-5747 to reach Concrete Fastening Systems, Inc.

Uses

Concrete is the only base material into which the trubolt wedge anchor should be installed.  They are not designed for use in brick, block or other porous base materials.

Length Identification

For ease of inspection, a letter is stamped onto the threaded end allowing for embedment verification once the Trubolt wedge anchor has been installed in the concrete .  The table below shows the letter and identifies the overall length of the trubolt wedge anchor:

Letter Designation

Anchor Length

A

1-1/2 < 2

B

2 < 2-1/2

C

2-1/2 < 3

D

3 < 3-1/2

E

3-1/2 < 4

F

4 < 4-1/2

G

4-1/2 < 5

H

5 < 5-1/2

I

5-1/2 < 6

J

6 < 6-1/2

K

6-1/2 < 7

L

7 < 7-1/2

M

7-1/2 < 8

N

8 < 8-1/2

O

8-1/2 < 9

P

9 < 9-1/2

Q

9-1/2 < 10

R

10 < 11

S

11 < 12

T

12 < 13

Once the length of the anchor is known, subtracting the length of the anchor above the concrete from the overall length will give the amount of the trubolt’s embedment into the concrete.  This is important because each diameter trubolt wedge anchor must be installed to a minimum embedment.

 

Full Threads
The trubolt wedge anchor is fully threaded because the stud portion is threaded for a major portion of its length.  These full threads eliminate subsurface obstruction problems and provide extra threads for leveling and shimming if needed.

Hole Size
The hole diameter needed to be drilled into the concrete base material is equal to the diameter of trubolt wedge anchor being installed.  The bit that is used to drill the hole must be carbide tipped and used in a hammer drill.  The carbide tipped bit must meet ANSI standards B212.15-1994.

Hole Depth
The trubolt wedge anchor does not need the bottom of the hole for proper installation. In fact, the trubolt wedge anchor can be used in a hole that is deeper than the length of the anchor.

Fixture
Each diameter of trubolt wedge anchor can be placed through a hole in the fixture being attached without the spotting of the hole.  The hole in the fixture needs to be slightly larger than the designated diameter of trubolt wedge anchor being installed.

Trubolt Anchor Diameter

Minimum Diameter of Hole In Fixture

1/4”

5/16”

3/8”

7/16”

1/2”

9/16”

5/8”

11/16”

3/4”

13/16”

7/8”

1”

1”

1-1/8”


Expansion Clip
The expansion clip on the trubolt wedge anchor is manufactured to provide a full 360 degrees of expansion for reliable holding values.

Types

 

  • Carbon Steel Zinc Plated – are designed for use in dry indoor applications.
  • Hot-Dipped Galvanized – for use in wet atmospheres, outdoors but not submerged in water.
  • 304 Stainless Steel – outdoors applications, wet atmospheres where water is present.
  • 316 Stainless Steel – applications submerged in water and other types of chemicals where rust resistance is critical.

Diameters
The trubolt wedge anchor comes in seven diameters which are designated in fractional sizes of 1/4”, 3/8”, 1/2”, 5/8”, 3/4”, 7/8” and 1”

Lengths
Each diameter has different unique lengths ranging from 1-3/4” long for the shortest 1/4” trubolt wedge anchor up to 12” in length for diameters of 3/4” and 1”. The chart below shows each diameter and the corresponding length for each as well as the thread length:

Diameter x Length

Thread Length

1/4” x 1-3/4”

3/4”

1/4” x 2-1/4”

1-1/4”

1/4” x 1-3/4

2-1/4”

3/8” x 2-1/4”

1-1/8”

3/8” x 2-3/4”

1-5/8”

3/8” x 3”

1-3/4”

3/8” x 3-3/4”

2-1/2”

3/8” x 5

3-3/4”

3/8” x 7”

3-7/8”

1/2” x 2-3/4”

1-1/4”

1/2” x 3-3/4”

2-1/4”

1/2” x 4-1/4”

2-3/4”

1/2” x 4-1/2”

3”

1/2” x 5-1/2”

4”

1/2” x 7”

5-1/2”

5/8” x 3-1/2”

1-3/4”

5/8” x 4-1/2”

2-1/2”

5/8” x 5”

3-1/4”

5/8” x 6”

4-1/4”

5/8” x 7”

5-1/4”

5/8” x 8-1/2”

5-3/4”

5/8” x 10”

6-3/4”

3/4” x 4-1/4”

2-3/8”

3/4” x 4-3/4”

2-7/8”

3/4” x 5-1/2”

3-5/8”

3/4” x 6-1/4”

4-3/8”

3/4” x 7”

5-1/8”

3/4” x 8-1/2”

5-3/4”

3/4” x 10”

5-3/4”

3/4” x 12”

1-3/4”

7/8” x 6”

2-1/2”

7/8” x 8”

2-1/2”

7/8” x 10”

2-1/2”

1” x 6”

2-1/2”

1” x 9”

2-1/2”

1” x 12”

2-1/2”


Minimum Embedment
The minimum embedment is determined by subtracting the overall length of the trubolt wedge anchor being installed from the maximum fixture thickness.  The trubolt wedge anchor must be embedded into the concrete a minimum distance for the trubolt wedge anchor to achieve minimum holding values. 

Trubolt Size

Maximum Fixture Thickness

Minimum Embedment

1/4” x 1-3/4”

3/8”

1-3/8”

1/4” x 2-1/4”

7/8”

1-3/8”

1/4” x 3-1/4

1-7/8”

1-3/8”

3/8” x 2-1/4”

3/8”

2-7/8”

3/8” x 2-3/4”

7/8”

2-7/8”

3/8” x 3”

1-1/8”

2-7/8”

3/8” x 3-3/4”

1-7/8”

2-7/8”

3/8” x 5

3-1/8”

2-7/8”

3/8” x 7”

5-1/8”

2-7/8”

1/2” x 2-3/4”

1/8”

2-5/8”

1/2” x 3-3/4”

1”

2-3/4”

1/2” x 4-1/4”

1-1/2”

2-3/4”

1/2” x 4-1/2”

1-3/4”

2-3/4”

1/2” x 5-1/2”

2-3/4”

2-3/4”

1/2” x 7”

4-1/4”

2-3/4”

5/8” x 3-1/2”

1/8”

3-3/8”

5/8” x 4-1/2”

7/8”

3-3/8”

5/8” x 5”

1-5/8”

3-3/8”

5/8” x 6”

2-5/8”

3-3/8”

5/8” x 7”

3-5/8”

3-3/8”

5/8” x 8-1/2”

5-1/8”

3-3/8”

5/8” x 10”

6-5/8”

3-3/8”

3/4” x 4-1/4”

1/4”

4”

3/4” x 4-3/4”

3/4”

4”

3/4” x 5-1/2”

1-1/2”

4”

3/4” x 6-1/4”

2-1/4”

4”

3/4” x 7”

3”

4”

3/4” x 8-1/2”

4-1/2”

4”

3/4” x 10”

6”

4”

3/4” x 12”

8”

4”

7/8” x 6”

1-3/8”

5-5/8”

7/8” x 8”

3-3/8”

5-5/8”

7/8” x 10”

5-3/8”

5-5/8”

1” x 6”

1/2”

5-1/2”

1” x 9”

3-1/2”

5-1/2”

1” x 12”

6-1/2”

5-1/2”


Torque Values*
The trubolt wedge anchor must be torqued to a specific torque value based on the designated diameter of the trubolt being installed. Torqueing the trubolt wedge anchor to a lesser value will cause a decrease in holding values.  Torqueing to a higher value may cause the trubolt wedge anchor to slip or spin in the hole, creating a lesser to zero holding value as well creating a situation where the trubolt wedge anchor is unable to be removed.

Trubolt Diameter

Torque Values in ft-lb

1/4”

4

3/8”

25

1/2”

55

5/8”

90

3/4”

110

*Torque values not available for the 7/8” and 1” – call Red Head @ 800-897-7890

                                 ALLOWABLE STATIC HOLDING VALUES LIGHT WEIGHT UNCRACKED CONCRETE
                                                                                              2500 PSI Concrete

Nominal

Embedment

Tension

Shear

Diameter

Depth

 

1/4”

1-1/2”

611 lbs.

628 lbs.

3/8”

1-3/4”

965 lbs.

1307 lbs.

1/2”

1-7/8”

1,054 lbs.

1,954 lbs.

5/8”

2-1/2”

1,825 lbs.

2,655 lbs.

3/4”

3-1/2”

3,527 lbs.

4,827 lbs.

For complete technical information on the trubolt wedge anchor: http://www.itwredhead.com/trubolt.asp

Installation:

 

  1. Select carbide tipped drill bit that meets ANSI standards and is equal to the diameter of the trubolt wedge anchor being installed. 
  2. Drill the hole to a depth that exceeds the desired embedment as well as the minimum embedment depth for the diameter of trubolt being installed.
  3. Clean the hole of all dust using a wire brush, vacuum or compressed air.
  4. Assemble the nut and washer on to the threaded end of the trubolt wedge anchor. The nut should be flush with the top of the anchor body to protect the threads during installation. 
  5. Insert the trubolt wedge anchor through the fixture and into the predrilled hole in the concrete.
    Using a hammer, strike the nutted end of the trubolt wedge anchor until the washer is tight against the surface of the fixture.
  6. By hand, tighten the nut and then use the correct size wrench to turn the nut clockwise 3-5 turns to the specified torque value.




 

Please remember with all fastening jobs to keep safety in mind. Always follow safety instructions on all tools, and refer to manufacturer's installation instructions when available and always remember to wear safety goggles!

Article written by: Bob Carlisle, President Concrete Fastening Systems, Inc

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