• Customer Reviews

Grainger Trubolt

Purchase Wedge Anchors

Red Head

Red Head Concrete Anchoring Solutions include the Trubolt® wedge type expansion anchor. It is heavy duty and dependable for anchoring into solid concrete. It should never be used in hollow block or brick. All Trubolt® wedge anchors have a stainless steel expansion clip, a threaded stud body, nut, and washer.


  • Anchor bodies, nuts, and washers are made from carbon steel that is either zinc plated or hot-dipped galvanized, type 304 stainless steel and 316 stainless steel.
  • Each anchor is stamped to allow inspection for depth of embedment.
  • The diameter of anchor drilled in concrete is equal to the diameter of Trubolt® being installed.
  • Fully threaded design in anchors up to 3/4” in diameter and 10” in length.
  • Can be installed through fixture while in place.
  • Non- bottom bearing type anchor, does not need the bottom of the hole to be set, which means that the hole can be any depth longer than the length of the Trubolt® being used.

Trubolt Installation

  • When installing any Trubolt® wedge anchor, use a carbide tipped hammer drill bit with the bits that are made in accordance with ANSI B212.15-1994 to ensure proper hole tolerance. The carbide tipped hammer drill bit must be used in a hammer drill and the drill must be set to the hammer and rotation mode while drilling the hole in the concrete.
  • Using a carbide tipped bit that is the same diameter as the Trubolt® wedge anchor being installed, drill the hole exceeding the minimum embedment of the anchor. (See Chart Below)
  • Clean hole and drill the hole to a depth to accommodate drill fines.
  • Assemble the nut and washer onto the threaded end of the Trubolt® wedge anchor, leaving the top of the nut flush with the top of the anchor in order to protect the threads during installation.
  • Using a hammer, drive the Trubolt® wedge anchor through the fixture and into the hole in the concrete until the nut and washer are tight against the surface of the fixture.
  • Finger-tighten the nut and use a wrench to turn the nut clockwise 3 to 5 turns, or to the specified torque value.

Length Identification Chart

Stamped Letter Designation Anchor Length in Inches
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

Minimum Embedment Chart

Trubolt Wedge Anchor

Diameter of Trubolt Wedge Anchor Minimum Embedment Depth
1/4” 1-1/8”
3/8” 1-1/2”
1/2” 2-1/4”
5/8” 2-3/4”
3/4” 3-1/4”
7/8” 3-3/4”
1” 4-1/2

Installation Torque Value

Trubolt Wedge Anchor

Trubolt Wedge Anchor Diameter Recommended Torque Requirement
1/4” 4 ft./lbs.
3/8” 25 ft./lbs.
1/2” 55 ft./lbs.
5/8” 90 ft./lbs.
3/4” 110 ft./lbs.
7/8” 250 ft./lbs.
1” 300 ft./lbs.

Technical Information

The holding values at different embedment depths installed in different strength concrete as well as lightweight concrete can be found at ITW Red Head. The values cited on the website are for the Ultimate load capacity of the Trubolt® wedge anchor in different weight concrete. The safe working load is determined by dividing by 4 or 25%. Spacing information for placing the Trubolt® wedge anchors away from each other and from an unsupported edge can also be found. The holding values are stated in lbs. as well as k/N and the values refer to zinc plated carbon steel, hot-dipped galvanized, 304 and 316 stainless steel. Combined tension and shear loading applications holding values can be determined by using the following equation. Click on Performance Data for all the technical information published by ITW Red Head.

Ps = Applied tension load Vs = Applied shear load Pt = Allowable tension load Vt = Allowable shear load

(Ps/Pt) 5/3 + (Vs/Vt) 5/3 < 1

Product Information

Each diameter of Trubolt® wedge anchor comes in different lengths; the longer lengths do not necessarily mean deeper embedment. The different lengths are to accommodate different thickness of materials being fastened. The length of Trubolt® wedge anchor to use on any particular application is determined by adding the thickness of the material being fastened to the minimum embedment for the diameter of Trubolt® wedge anchor being used plus space for the nut and washer. The space required for the nut and washer is approximately equal to the diameter of the anchor being installed. Each length of Trubolt® wedge anchor also has different thread length. Go to Selection and Order Information for complete information.

Additional Links

Concrete Fastening Systems

ITW RedHead


Purchase Wedge Anchors

Nov 6th 2011 Bob Carlisle

Recent Posts

  • Best Masonry Anchors

    Get the job done right the first time by using the best masonry anchors for the application. A mason …
    Nov 24th 2020 Bob Carlisle
  • Best Brick Anchors

    Male or Female Anchor? Female anchors would require the spotting of the anchor and then place th …
    Feb 21st 2019 Bob Carlisle