Back to Concrete Wedge Anchor ~ Thunderstud®
Technical Information:
The
ThunderStud® wedge anchor consists of two
pieces, permanently preassembled
into a single unit. The carbon steel
rod is threaded
for a portion of its length. The extreme end
of the threaded portion is rounded
to protect the threads from damage
while the anchor is being driven into the
hole drilled
in the concrete. The other end of
the rod has a necked down diameter,
which runs
for a short distance, at the end of which it
tapers outwardly to the full diameter
of the rod. A precision formed universal
clip made of carbon steel is permanently assembled
around the necked down diameter to
complete the anchor. Each package
contains the correct number of nuts and washers.
Concrete Wedge Anchor -
Approvals:
Listed by Underwriters Laboratories (UL), International
Conference of Building Officials (ICBO) carbon steel only, Board
of Standards and Appeals (BSA), City of L.A. Meets or exceeds
U.S. Government G.S.A. Specifications FF-S-325 Group 11, Type
4, Class
Concrete Wedge Anchor -
Applications:
Medium to heavy duty into concrete.
Concrete Wedge Anchor -
Installation:
(1) Drill hole into concrete
with a carbide tipped masonry drill bit conforming
to
ANSI B94, 12-77, the
same size as the ThunderStud® wedge anchor. If the fixture being
fastened is in place and being used as a template to locate
the ThunderStud® anchor, the mounting hole in the fixture should
afford clearance for the universal wedge clip on the stud. (2)
Clean hole, place the ThunderStud® wedge anchor
through the hole in the fixture or directly
into the concrete and hammer
it in to the drilled hole until the threads
are below the surface of the fixture/concrete.
(3) Turn the nut by hand until the
unit is snugged up. Tighten the nut with
a wrench, approximately three or four full
turns,
to complete the fastening.
Concrete Wedge Anchor -
Anchor Length:
Minimum
embedment, plus fixture, plus
nut and washer. The ThunderStud® wedge
anchor requires no maximum hole
depth. The depth of the hole in the
concrete should be
the length of the wedge anchor minus
the thickness of the material being
fastened. This will
result in some extra depth to
accommodate a minor amount of concrete
cutting which may not be able to be cleaned out of
hole.
Concrete Wedge Anchor -
Anchor Spacing:
The
forces on a ThunderStud® wedge anchor
are transferred to the material that
it is installed in. If the anchors
are installed too close
together, it can cause an
interaction of the forces, thus reducing
the holding power of the anchor.
As a rule of thumb, the concrete
anchor industry has established a minimum standard
of
ten (10) anchor diameters for
spacing between anchors and
five (5) anchor diameters from
an unsupported edge. When vibration or
sudden impact are part of the
load condition anchor spacing
should be increased.
Concrete Wedge Anchor -
Material Composition
| MATERIAL |
STEEL |
STAINLESS |
SPECIFICATION |
STEEL |
STAINLESS |
| Stud |
AISI C12L14 |
303 304 316 |
ASTM |
A108 A510 |
A276 A479 |
| Clip |
AISI
C1010-10181037 |
304
316 |
FEDERAL |
FF-SS325
GROUP II TYPE 4 CLASS 1 |
A581
A582 FF-S-325 |
| Washer |
AISI C1010-1018 |
TYPE 18-8 316 |
PLATING |
ZINC QQ-Z-325C |
GROUP II |
| Nut |
LOW CARBON ASTM A 563 GRADE A |
TYPE
18-8 316 |
GALVANIZED |
TYPE
II CLASS 3 ASTM A 153 CLASS C |
TYPE
4 CLASS 1 PASSIVATED |
Concrete Wedge Anchor -
Length Identification
System - Technical
Data
| Anchor Diameter (in.) |
Embed. Depth (in.) |
Torque Ft/Lb |
2000 PSI |
4000 PSI |
6000 PSI |
| Tension (LB) |
Shear (LB) |
Tension (LB) |
Shear (LB) |
Tension (LB) |
Shear (LB) |
| 1/4 |
1-1/8 |
5-10 |
1170 |
1443 |
1771 |
1813 |
2773 |
2635 |
| 1-3/4 |
1841 |
1443 |
2408 |
1813 |
2773 |
2635 |
| 2-3/4 |
1975 |
1443 |
2748 |
1813 |
2830 |
2635 |
| 3/8 |
1-1/2 |
25-30 |
1631 |
4318 |
3636 |
5121 |
4448 |
6232 |
| 3 |
3229 |
4318 |
5653 |
5121 |
5975 |
6232 |
| 5 |
4075 |
4318 |
6328 |
5121 |
6360 |
6232 |
| 1/2 |
2-1/4 |
50-60 |
3999 |
7419 |
6714 |
9377 |
9616 |
9888 |
| 4 |
6336 |
7419 |
8942 |
9377 |
10192 |
9888 |
| 6 |
6902 |
7419 |
10175 |
9377 |
12064 |
9888 |
| 5/8 |
3-3/4 |
75-90 |
4999 |
8264 |
8747 |
12928 |
9760 |
16373 |
| 5 |
8854 |
8264 |
15590 |
12928 |
19802 |
16373 |
| 7 |
9381 |
8264 |
16710 |
12928 |
17732 |
16373 |
| 3/4 |
3-1/4 |
150-175 |
6638 |
12504 |
11314 |
17050 |
16230 |
22965 |
| 6 |
10084 |
12504 |
18408 |
17050 |
21092 |
22965 |
| 8 |
11170 |
12504 |
19805 |
17050 |
22522 |
22965 |
| 7/8 |
3-7/8 |
200-250 |
8392 |
18250 |
16354 |
20234 |
16801 |
23980 |
| 5-3/4 |
12064 |
18250 |
18250 |
20234 |
23404 |
23980 |
| 8-3/4 |
12784 |
18250 |
16850 |
20234 |
25575 |
23980 |
| 1 |
4-1/2 |
250-300 |
9773 |
23617 |
18250 |
27605 |
27460 |
28909 |
| 7-1/2 |
11890 |
23617 |
26726 |
27605 |
34960 |
28909 |
| 10 |
15590 |
23617 |
30491 |
27605 |
37840 |
28909 |
| 1-1/4 |
5-1/2 |
400-450 |
17550 |
32275 |
22971 |
42690 |
32368 |
55566 |
| 7 |
21050 |
32275 |
27845 |
42690 |
48366 |
55566 |
| 10 |
27893 |
32275 |
34788 |
42690 |
61272 |
55566 |
| Anchor Size |
Hole Size |
Min. Embedment |
Std. Thread Length |
| 1/4” all sizes |
1/4” |
1-1/8” |
3/4” |
| 3/8” x 2-1/4” |
3/8” |
1-1/2” |
7/8” |
| 3/8” |
3/8” |
1-1/2” |
1-1/8” |
| 1/2” all
sizes |
1/2” |
2-1/4” |
1-1/4” |
| *1/2”
x 7” |
1/2” |
2-1/4” |
1-1/4” |
| 5/8” all
sizes |
5/8” |
2-3/4” |
2” |
| *5/8” x 7” |
5/8” |
2-3/4” |
2” |
| *5/8” x 8-1/2” |
5/8” |
2-3/4” |
2” |
| 3/4” all
sizes |
3/4” |
3-1/4” |
2” |
| *3/4” x 7” |
3/4” |
3-1/4” |
2” |
| *3/4” x 8-1/2” |
3/4” |
3-1/4” |
2” |
| 7/8” |
7/8” |
3-7/8” |
2-1/4” |
| 1” |
1” |
4-1/2” |
2-1/4” |
| 1-1/4” |
1-1/4” |
5-1/2” |
3-1/4” |
Values shown are average ultimate values and are offered only as a guide and are not guaranteed. A safety factor of 4:1 or 25% is generally accepted as a safe working load. Reference should be made to applicable codes for the specific working ratio. *Tested by ATEC in accordance with ASTM E488-90 and ICBO Minimum embedment for satisfactory anchor performance is 4-1/2 bolt diameters. Deeper embedments will yield higher tension and shear capacity.
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