Blind Bolt Technical Data

All dimensions are in mm unless stated otherwise

The Blind Bolt Company Ltd reserve the right to change these technical details without notice.

Blind Bolt Product Specification
Zinc & Yellow / Dorreltech
Bolt Size
Box
Qty 		Hole
Diameter
Fixing Thickness
Min Max
Anchor
Clearance 		Depth
Clearance 		Minimum
Hole Centers
M8 x 50
50 9 9 24 19 25 20
M10 x 60
40 11 10 30 23 30 20
M10 x 130
20 11 55 100 23 30 20
M12 x 70
20 13 12 35 26 35 25
M16 x 90*
20 17 13 43 36 43 35
M20 x 110*
10 22 21 56 44 56 48
M20 x 140*
10 22 21 86 44 56 48
M20 x 160*
10 22 65 100 44 56 48
M20 x 180*
10 22 80 120 44 56 48
M20 x 250*
10 22 130 185 44 56 48
M24 x 130*
5 26 21 66 53 64 48
* We strongly recommend the use of our safety gauges when installing these bolts


Important Note

The below tension resistances make no allowance for the deformation or yield of the connected parts. An appropriate design model for connections in hollow sections can be found in Joints in Steel Construction: Simple Connections

Click here to download our official SCI Report
High Tensile Zinc & Yellow
Passivated Blind Bolt
Design to BS 5950-1
Diameter Tension Capacity
Pt (kN)		 Shear Capacity
Over Thread
Ps, thread (kN)		 Shear Capacity Over Slot
Ps, slot (kN)		 Bearing Capacity
in 10mm Plate
S275
Pb, (kN)		 S355
Pb, (kN)
M 8 6.9 14.6 9.3 20.7 24.8
M 10 12.9 23.2 15.9 27.6 33.0
M 12 18.8 33.7 22.0 32.2 38.5
M 16 40.2 62.7 42.9 46.0 55.0
M 20 57.9 97.9 63.4 55.2 66.0
M 24 82.4 141.0 87.8 64.4 77.0
These values are suitable for design to BS 5950-1 and can be used without further reduction for comparison to factored loads. Bearing resistances for different plate thicknesses can be calculated by scaling the values in proportion to the thickness, but should only be used where the distance from the centre line of the hole to the end of the plate is greater than 1.25d.

Combined tension and shear should satisfy the following equation:
High Tensile Zinc & Yellow
Passivated Blind Bolt
Design to BS EN 1993-1-8
Diameter Tension Resistance
Ft, Rd (kN)		 Shear Resistance
Over Thread
Fv, Rd, thread (kN)		 Shear Resistance
Over Slot
Fv, Rd, Slot (kN)
M 8 6.9 14.6 11.1
M 10 12.9 23.2 19.0
M 12 18.8 33.7 26.3
M 16 40.1 62.7 51.5
M 20 57.8 97.9 76.1
M 24 82.3 141.0 105.4
These are design values for use with BS EN 1993-1-8, and a partial safety factor of γM2 = 1.25 has already been applied. Bearing resistances should be calculated from BS EN 1993-1-8, Table 3.4, taking d as the nominal diameter of the bolt.

Combined tension and shear should satisfy the following equation:

Important Note

The above tension resistances make no allowance for the deformation or yield of the connected parts. An appropriate design model for connections in hollow sections can be found in Joints in Steel Construction: Simple Connections

Click here to download our official SCI Report
Blind Bolt Product Specification Stainless Steel A4
Bolt Size
Box
Qty 		Hole
Diameter
Fixing Thickness
Min Max
Anchor
Clearance 		Depth
Clearance 		Minimum
Hole Centers
M8 x 50
50 9 9 24 19 25 20
M10 x 60
40 11 10 30 23 30 20
M12 x 90
20 13 12 55 26 35 25
M16 x 100
20 17 13 53 36 43 35
Stainless Steel A4
Blind Bold
Diameter Tensile (kN)
 ULTIMATE 		Shear (kN)
(Over Thread)
ULTIMATE 		Shear (kN)
(Over Slot)
ULTIMATE 		Torque (Nm)
MAX
M 8 9.6 18.6 10.1 5.5
M 10 12.2 35 28.4 12
M 12 16.9 64 34.7 19
M 16 31.4 61.1 46.1 59