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The Type HB Hollo-Bolt is a product for connecting to square, rectangular or circular structural tube or to conventional steel where access is available from one side only. The Hollo-Bolt offers a reduction in installation time over traditional connection methods such as welding, drilling and tapping holes or unsightly strapping. The Hollo-Bolt gives the specifier confidence and peace of mind with guaranteed safe working loads and a 5:1 factor of safety. For aggressive environments the Hollo-Bolt has a HDG corrosion protection finish, alternatively the product is available in stainless steel.
The patented five part 5/8" (M16) and 3/4" (M20) sizes feature a collapse mechanism to maximize clamping force and enable use in primary moment connections. |
Head Variations
The standard Hollo-Bolt features an integral hexagon head bolts. If required the following head variations can be supplied.
Button Head |
Countersunk |
Hexagonal |
Socket Head
Cap Screw |
Electrogalvanized Hollo-Bolt
Note: Three Lengths are available as indicated by the product code.
| Table for Type HB |
Bolt
Size
Metric
(US Equiv) |
Product
Code |
Clamping Range
Combined Material
Thickness (W) |
Across
Flats
Main
Body |
Tightening
Torque
(ft lb) |
Shank
Diam.
(A) |
Hole
Size
(Z) |
Structural
Tube |
Safe Working Load*
(5:1 Factor of Safety) |
| Min |
Max |
Tensile
(lb) |
Shear
(lbs) |
| M8 (5/16") |
LHBM08 #1-EG |
1/8" |
7/8" |
3/4" |
16 |
9/16" |
9/16" |
5" x 5" x
3/16", 1/4",
or 5/16" |
899 |
1124 |
| LHBM08 #2-EG |
7/8" |
1-5/8" |
| LHBM08 #3-EG |
1-5/8" |
2-3/8" |
| M10 (3/8") |
LHBM10 #1-EG |
1/8" |
7/8" |
15/16" |
30 |
3/4" |
3/4" |
5" x 5" x
5/16", 3/8" or 1/2" |
1910 |
2248 |
| LHBM10 #2-EG |
7/8" |
1-5/8" |
| LHBM10 #3-EG |
1-5/8" |
2-3/8" |
| M12 (1/2") |
LHBM12 #1-EG |
1/8" |
1" |
1-3/16" |
59 |
13/16" |
13/16" |
5" x 5" x
5/16", 3/8" or 1/2" |
2360 |
3372 |
| LHBM12 #2-EG |
1" |
1-13/16" |
| LHBM12 #3-EG |
1-13/16" |
2-3/4" |
| M16 (5/8") |
LHBM16 #1-EG |
5/16" ** |
1-1/8" |
1-3/8" |
140 |
1-1/16" |
1-1/8" |
5" x 5" x
1/2" |
4946 |
6744 |
| LHBM16 #2-EG |
1-1/8" |
2" |
| LHBM16 #3-EG |
2" |
2-13/16" |
| M20 (3/4") |
LHBM20 #1-EG |
5/16" ** |
1-5/16" |
1-13/16" |
221 |
1-5/16" |
1-3/8" |
5" x 5" x
1/2" |
8992 |
8992 |
| LHBM20 #2-EG |
1-5/16" |
2-3/8" |
| LHBM20 #3-EG |
2-3/8" |
3-3/8" |
**While the minimum fixing thickness for M16/M20 is 5/16", it is important that the outer ply is at least 5/16" to maximize shear capabilities. Where the outer ply is below 5/16" thickness, spacer washers should be used beneath the collar to increase to 8mm.
***For further structural tube details not listed, please contact our technical department.
The tensile strength of a connection using the Hollo-Bolt may be governed by the structural steel to which it is connected. The tensile value shown above is the tensile strength of the Hollo-Bolt itself. Please consult a structural engineer to check the capacity of your structural steel. Please contact LNA Solutions for test results of some other common structural tube sections.
Hot Dipped Galvanized Hollo-Bolt
Note: Three Lengths are available as indicated by the product code.
| Table for Type HB |
Bolt
Size
Metric
(US Equiv) |
Product
Code |
Clamping Range
Combined Material
Thickness (W) |
Across
Flats
Main
Body |
Tightening
Torque
(ft lb) |
Shank
Diam.
(A) |
Hole
Size
(Z) |
Structural
Tube |
Safe Working Load*
(5:1 Factor of Safety) |
| Min |
Max |
Tensile
(lb) |
Shear
(lbs) |
| M8 (5/16") |
LHBM08 #1-HDG |
1/8" |
7/8" |
3/4" |
16 |
9/16" |
9/16" |
5" x 5" x
3/16", 1/4",
or 5/16" |
899 |
1124 |
| LHBM08 #2-HDG |
7/8" |
1-5/8" |
| LHBM08 #3-HDG |
1-5/8" |
2-3/8" |
| M10 (3/8") |
LHBM10 #1-HDG |
1/8" |
7/8" |
15/16" |
30 |
3/4" |
3/4" |
5" x 5" x
5/16", 3/8" or 1/2" |
1910 |
2248 |
| LHBM10 #2-HDG |
7/8" |
1-5/8" |
| LHBM10 #3-HDG |
1-5/8" |
2-3/8" |
| M12 (1/2") |
LHBM12 #1-HDG |
1/8" |
1" |
1-3/16" |
59 |
13/16" |
13/16" |
5" x 5" x
5/16", 3/8" or 1/2" |
2360 |
3372 |
| LHBM12 #2-HDG |
1" |
1-13/16" |
| LHBM12 #3-HDG |
1-13/16" |
2-3/4" |
| M16 (5/8") |
LHBM16 #1-HDG |
5/16" ** |
1-1/8" |
1-3/8" |
140 |
1-1/16" |
1-1/8" |
5" x 5" x
1/2" |
4946 |
6744 |
| LHBM16 #2-HDG |
1-1/8" |
2" |
| LHBM16 #3-HDG |
2" |
2-13/16" |
| M20 (3/4") |
LHBM20 #1-HDG |
5/16" ** |
1-5/16" |
1-13/16" |
221 |
1-5/16" |
1-3/8" |
5" x 5" x
1/2" |
8992 |
8992 |
| LHBM20 #2-HDG |
1-5/16" |
2-3/8" |
| LHBM20 #3-HDG |
2-3/8" |
3-3/8" |
**While the minimum fixing thickness for M16/M20 is 5/16", it is important that the outer ply is at least 5/16" to maximize shear capabilities. Where the outer ply is below 5/16" thickness, spacer washers should be used beneath the collar to increase to 8mm.
***For further structural tube details not listed, please contact our technical department.
The tensile strength of a connection using the Hollo-Bolt may be governed by the structural steel to which it is connected. The tensile value shown above is the tensile strength of the Hollo-Bolt itself. Please consult a structural engineer to check the capacity of your structural steel. Please contact LNA Solutions for test results of some other common structural tube sections. |
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Stainless Steel Hollo-Bolt
Note: Three Lengths are available as indicated by the product code.
| Table for Stainless Steel Hollo-Bolts |
Bolt Size
Metric
(US Equiv) |
Product
Code |
Combined
Material
Thickness (W) |
Across
Flats
Main
Body |
Tightening
Torque
(ft lb) |
Shank
Diam.
(A) |
Hole
Size
(Z) |
Structural
Tube |
Safe Working Load*
(5:1 Factor of Safety) |
| Min |
Max |
Tensile
(lb) |
Shear
(lbs) |
| M8 (5/16") |
LHBM08 #1-SS |
1/8" |
7/8" |
3/4" |
16 |
9/16" |
9/16" |
5" x 5" x
1/2" |
1348 |
1124 |
| LHBM08 #2-SS |
7/8" |
1-5/8" |
| LHBM08 #3-SS |
1-5/8" |
2-3/8" |
| M10 (3/8") |
LHBM10 #1-SS |
1/8" |
7/8" |
15/16" |
30 |
3/4" |
3/4" |
5" x 5" x
1/2" |
2248 |
2248 |
| LHBM10 #2-SS |
7/8" |
1-5/8" |
| LHBM10 #3-SS |
1-5/8" |
2-3/8" |
| M12 (1/2") |
LHBM12 #1-SS |
1/8" |
1" |
1-3/16" |
59 |
13/16" |
13/16" |
5" x 5" x
1/2" |
3372 |
3372 |
| LHBM12 #2-SS |
1" |
1-13/16" |
| LHBM12 #3-SS |
1-13/16" |
2-3/4" |
| M16 (5/8") |
LHBM16 #1-SS |
5/16" ** |
1-1/8" |
1-3/8" |
140 |
1-1/16" |
1-1/8" |
5" x 5" x
1/2" |
7418 |
6744 |
| LHBM16 #2-SS |
1-1/8" |
2" |
| LHBM16 #3-SS |
2" |
2-13/16" |
| M20 (3/4") |
LHBM20 #1-SS |
5/16" ** |
1-5/16" |
1-13/16" |
221 |
1-5/16" |
1-3/8" |
7" x 7" x
5/16" |
10341 |
8992 |
| LHBM20 #2-SS |
1-5/16" |
2-3/8" |
| LHBM20 #3-SS |
2-3/8" |
3-3/8" |
**While the minimum fixing thickness for M16/M20 is 5/16", it is important that the outer ply is at least 5/16" to maximize shear capabilities. Where the outer ply is below 5/16" thickness, spacer washers should be used beneath the collar to increase to 8mm.
***For further structural tube details not listed, please contact our technical department.
The tensile strength of a connection using the Hollo-Bolt may be governed by the structural steel to which it is connected. The tensile value shown above is the tensile strength of the Hollo-Bolt itself. Please consult a structural engineer to check the capacity of your structural steel. Please contact LNA Solutions for test results of some other common structural tube sections.
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Hole Preparation
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Some care must be taken both in preparation of the drilled hole for the product and in the location of the hole with regard to the structural tube section. The table below gives guidelines for:
- (X) - minimum distance between hole centers for neighboring Hollo-Bolts,
- (Y) - minimum distance of hole center from inside wall of hollow section steel
- (Z) - drill size to be used .
The diagram on the left illustrates these dimensions.
| Hollo-Bolt Hole Preparation |
| Product Code |
X (Min) |
Y(Min) |
Z Hole Size |
Minimum Edge
Distance = (Y + T) |
| LHB08 |
1-3/8" |
1/2" |
9/16" |
11/16" |
| LHB10 |
1-9/16" |
9/16" |
3/4" |
7/8" |
| LHB12 |
2" |
3/4" |
13/16" |
1" |
| LHB16 |
2-3/16" |
13/16" |
1-1/8" |
1-5/16" |
| LHB20 |
2-3/4" |
1" |
1-3/8" |
1-5/16" |
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I nstalling the Hollo-Bolt
Perhaps Hollo-Bolt’s greatest advantage is the ease with which the product can be installed. Detailed below are the three simple installation stages.
- Drill holes in required position (see hole preparation table above for recommended hole size). Position the Hollo-Bolt and fixture to the steel (the example pictured above shows steel angle). Insert product through both fixture and steel, cone end first.
- Grip the Hollo-Bolt collar with an open ended wrench. Using a torque wrench, tighten the central bolt to the recommened torque given in the table on the previous page.
- The Hollo-Bolt cone is drawn up into the body, spreading the product's legs and providing a secure connection.
Note: When installing, ensure that the Hollo-Bolt collar is held firmly against the fixture throughout the installation process.
 For ease of installatin please use pneumatic tools on primary structural connections.
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