Throughbolt Stainless Steel Technical Data

The Throughbolt is a through fixing designed for medium duty applications in sold concrete. The drill hole diameter in the concrete is the same as the thread diameter. The hole into the concrete is drilled through a pre-drilled clearance hole in the fixture and with the fixture in situ. They are made from A4-316 grade stainless steel and are suitable for use in concrete over 20N/mm².

Typical applications for the Stainless Steel versions of this product include holding down bolts for Brickwork Support Angle, Cladding Brackets, Cold Storage Racking,  Food Preparation Areas and Marine Envirnoments.

Installation Instructions

1 – Position fixture and drill correct diameter hole to minimum recommended depth through the fixture

2 – Clean hole by brushing and blowing to remove drilling debris and dust

3 – Insert the Throughbolt through the fixture into the drilled hole

4 – Tighten the anchor to the recommended Torque

When embedded correctly, the technical specifications are as follows:

Spec Dimensions M6 M8 M10 M12 M16 M20
Thread Diam mm 6 8 10 12 16 20
Drill Hole Diam mm 6 8 10 12 16 20
Clearance Hole Diam mm 7 9 12 14 18 22
Min. Hole Depth mm 35 60 65 75 105 130
Min. Embedment Depth mm 30 55 60 70 95 120
Ultimate Tensile Strength N/mm2 600 600 600 600 600 600
Yield Strength N/mm2 530 530 530 530 530 530
Nut Dimension A/F mm 10 13 17 19 24 30
Rec. Tightening Torque Nm 7 20 35 55 100 240
Rec. Tensile Load kN 1.7 4.1 4.9 8.1 11.7 15.1
Rec. Shear Load kN 1.4 3.5 5.6 8.8 11.0 16.8
Minimum Spacing mm 120 160 200 240 320 400
Minimum Edge Distance mm 60 80 100 120 160 200

The loads shown in both cases are for 30N/mm² concrete. Shear loads are away from a free edge.

 

When specifiying a throughbolt, please use the following tables to see the various options available for each thread size:

 

For throughbolts with a 6mm thread diameter, the nut will be 10 mm across the flat (A/F), and they are available in the following variations:

Anchor Length (mm) 40 65
Maximum fixture thickness (mm) 2 15
Thread Length (mm) 18 28

For throughbolts with a 8mm thread diameter, the nut will be 13 mm across the flat (A/F), and they are available in the following variations:

Anchor Length (mm) 50 75 95 120
Maximum Fixture Thickness (mm) 2 10 30 55
Thread Length (mm) 25 32 41 66

For throughbolts with a 10mm thread diameter, the nut will be 17 mm across the flat (A/F), and they are available in the following variations:

Anchor Length (mm) 60 80 100 125
Maximum Fixture Thickness (mm) 3 10 30 55
Thread Length (mm) 28 34 54 67

For throughbolts with a 12mm thread diameter, the nut will be 19 mm across the flat (A/F), and they are available in the following variations:

Anchor Length (mm) 80 100 115 145 180
Maximum Fixture Thickness (mm) 5 20 35 65 100
Thread Length (mm) 35 50 52 82 46

For throughbolts with a 16mm thread diameter, the nut will be 24 mm across the flat (A/F), and they are available in the following variations:

Anchor Length (mm) 100 125 150 200
Maximum Fixture Thickness (mm) 5 20 45 95
Thread Length (mm) 53 65 76 55

For throughbolts with a 20mm thread diameter, the nut will be 30 mm across the flat (A/F), and they are available in the following variations:

Anchor Length (mm) 170 220 280
Maximum Fixture Thickness (mm) 20 70 130
Thread Length (mm) 55 55 55