BoxBolt Cavity Solutions

Overview

BoxBolt is a fully tested and approved blind connection solution for connecting to hollow section steel or where access is restricted to one side only. The BoxBolt is suitable for use with rectangular, square and even circular hollow sections. The BoxBolt features a hexagon head design to aid installation with a standard wrench. It allows it to be installed with our unique BoxSokTM installation tool for when installation time needs to be kept to an absolute minimum.

The BoxBolt is available in three finishes; Zinc Plated for the less aggressive environments, Hot Dip Galvanized for the more aggressive environments, and Stainless Steel for the most demanding of applications. These finishes combined with three lengths of BoxBolt make it extremely flexible to suit its environment and application. The BoxBolt is approved for use by Lloyds Register (LR) type approval and the Deutsches Institut für Bautechnik (DIBt) to give the specifier and user total confidence.

Materials

  • Mild steel to BS EN 10083 Grade 1.1151
  • Stainless steel to BS EN 10088 Grade 1.4401

Finishes

  • Zinc plated to BS EN 12329 : Class Fe//Zn8//A
  • Hot Dip Spun Galvanized to BS EN ISO 1461

The BoxBolt is often used on high profile projects where the aesthetics of the building are essential. It is for this reason the BoxBolt can be adapted to suit the requirements of the Client and the Architect to make the connection pleasing to the eye.

Technical Specifications

Diagram - BoxBolt
Diagram - BoxBolt

Select the type of finish you require on the BoxBolt by replacing the “_ “ in the code with a Z for zinc plated, a G for Hot Dip Galvanized or an S for Stainless Steel.

Example: BQ2G12 is a 1/2” BoxBolt size 2 in Hot Dip Galvanized Finish.

Part Number & Description Dimensional Information Load Information
Product
code
Bolt
Dia
     Size
 Setscrew
 Length
 Clamping range (X
Across Flats of
Shoulder
Shoulder thickness
Dim A
Dim B 
Hole size
Dia
 Torque
 Galvanised / Zinc Plate
Stainless Steel
       
Min     Max
(mm)
(mm)
(mm)
(mm)
 (mm)
(Nm)
Tensile (kN)
 Shear (kN)
Tensile
 (kN)
Shear
(kN)
BQ1Z06*
M06
1
45
 4
24
17
5
30
11
11 +1.0, -0.25
19
5.71
16.21
 /
 /        
BQ1_08 M08 1 50 5 26 22 6 35 13 14 +1.0, -0.25 25 12.86 21.07 13.29 26.14
BQ2_08 M08 2 70 18 46 22 6 35 13 14 +1.0, -0.25 25 12.86 21.07 13.29 26.14
BQ3_08 M08 3 90 30 66 22 6 35 13 14 +1.0, -0.25 25 12.86 21.07 13.29 26.14
BQ1_10 M10 1 50 5 23 24 7 40 15 18 +1.0, -0.25 45 24.07 37 21.7 47.07
BQ2_10 M10 2 70 18 43 24 7 40 15 18 +1.0, -0.25 45 24.07 37 21.7 47.07
BQ3_10 M10 3 90 35 63 24 7 40 15 18 +1.0, -0.25 45 24.07 37 21.07 47.07
BQ1_12 M12 1 55 5 25 26 8 50 18 20 +1.0, -0.25 80 29.43 48.29 30.64 59.86
BQ2_12 M12 2 80 20 50 26 8 50 18 20 +1.0, -0.25 80 29.43 48.29 30.64 59.86
BQ3_12 M12 3 100 40 70 26 8 50 18 20 +1., -0.25 80 29.43 48.29 30.64 59.86
BQ1_16 M16 1 75 5 35 36 9 55 20 26 +2.0, -0.25 190 52.29 88.21 57.07 108.57
BQ2_16 M16 2 100 30 60 36 9 55 20 26 +2.0, -0.25 190 52.29 88.21 57.07 108.57
BQ3_16 M16 3 120 55 80 36 9 55 20 26 +2.0, -0.25 190 52.29 88.21 57.07 108.57
BQ1_20 M20 1 100 8 42 46 11 70 25 33 +2.0, -0.25 300 92 145.32 89.07 181.79
BQ2_20 M20 2 120 35 72 46 11 70 25 33 +2.0, -0.25 300 92 145.32 89.07 181.79
BQ3_20 M20 3 150 65 102 46 11 70 25 33 +2.0, -0.25 300 92 145.32 89.07 181.79

The loads stated above are based on the LRFD (Load & Resistance Factor Design) method recommended by the AISC for bolted steel connections. This uses a factor of 0.75 of the ultimate load and therefore equates to a 1.33 to 1 factor of safety that we have applied to our published loads above. The overall strength of the connection is governed by the strength of material our BoxBolt is connecting into; therefore, this should be checked for structural capacity by a structural engineer.

Approvals – The published loads are taken from physical testing in hollow structural section which are then verified by Lloyds Register Type Approval. The BoxBolt is also tested and approved by DIBt (Deutsches Institut fur Bautechnik) which complies with the DIN 18800 and Eurocode 3 design methods for bolted steel connections. Please ask our technical team for more information.

Hole Dimensions and Positioning

Box Bolt Size Dim
A (mm)

Dim
B (mm)

Dim
C (mm)
M06 30 11 11 + 1.0,-0.25
M08 35 13 14 + 1.0,-0.25
M10 40 15 18 + 1.0,-0.25
M12 50 18 20 + 1.0,-0.25
M16 55 20 26 + 1.0,-0.25
M20 70 25 33 + 1.0,-0.25

Minimum edge distance = Dim B + the thickness of hollow section