Blind Bolt Technical Data

NOTE: All dimensions are in mm unless stated otherwise.

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

Blind Bolt Product Specification  - Zinc Flake - Property Class 10.9
Product Code Bolt Size Box Qty Hole Diameter
Fixing Thickness
Min Max
Anchor Clearance Depth Clearance Minimum Hole Centers
BB0850DTASM M8 x 50 50 9 9 24 19 25 20
BB1060DTASM M10 x 60 40 11 10 30 23 30 20
BB1095DTASM M10 x 95 20 11 25 65 23 30 20
BB10130DTASM M10 x 130 20 11 55 100 23 30 20
GBB30140DTASM M30 x 140* 5 32 27 60 65 72 75
* We strongly recommend the use of our safety gauges when installing these bolts

Blind Bolt Product Specification - Hot Dip Galvanised - Property Class 10.9
Product Code Bolt Size Box Qty Hole Diameter
Fixing Thickness
Min Max
Anchor Clearance Depth Clearance Minimum Hole Centers
BB1270HDG M12 x 70 20 13 12 35 26 35 25
BB12120HDG M12 x 120 25 13 30 85 26 35 25
BB12180HDG M12 x 180 20 13 80 140 26 35 25
GBB1475HDG M14 x 75* 20 15 14 35 32 38 32
GBB14125HDG M14 x 125* 20 15 28 82 32 38 32
GBB14185HDG M14 x 185* 20 15 75 142 32 38 32
GBB1690HDG M16 x 90* 20 17 13 43 36 43 35
GBB16130HDG M16 x 130* 15 17 40 75 36 43 35
GBB16180HDG M16 x 180* 10 17 55 125 36 43 35
GBB20110HDG M20 x 110* 10 22 21 56 44 56 48
GBB20140HDG M20 x 140* 8 22 21 86 44 56 48
GBB20180HDG M20 x 180* 10 22 80 120 44 56 48
GBB20250HDG M20 x 250* 10 22 130 185 44 56 48
GBB24130HDG M24 x 130* 5 26 21 62 53 64 60
* 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.

High Tensile Zinc Flake 1000Hr SSP Blind Bolt Design to BS 5950-1
Diameter

Tension Capacity

Shear Capacity
Over Thread

Shear Capacity Over Slot

Bearing Capacity
in 10mm Plate

Recommended
Tightening

Pt (kN)
 Ps, thread (kN)
 Ps, slot (kN)
  S275
Pb, (kN)

 S355
Pb, (kN)

 Torque (Nm)
M 8 9.8 14.6 7.9 20.7 24.8 15
M 10 14.1 23.2 15.8 27.6 33.0 24
M 12 22.4 33.7 22.0 32.2 38.5 30
M 14 34.8 46.0 29.0 36.8 44.0 40
M 16 38.8 62.7 43.0 46.0 55.0 50
M 20 71.4 97.9 63.4 55.2 66.0 65
M 24 116.7 141.0 87.8 64.4 77.0 75
M 30 174.5 224.0 137.2 80.5 96.3 85
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 2d.

Combined tension and shear should satisfy the following equation:

High Tensile Zinc Flake 1000Hr SSP  Blind Bolt Design to BS EN 1993-1-8
Diameter Tension
Resistance		 Shear Resistance
Over Thread 		Shear Resistance
Over Slot		 Bearing Resistance
in 10mm Plate 		Recommended
Tightening
Torque
Ft, Rd (kN) Fv, Rd thread (kN) Fv, Rd Slot (kN) S275
Fb, Rd(kN)		 S375
Fb, Rd(kN)		 (Nm)
M 8 9.8 14.6 9.1 65.6 75.2 15
M 10 14.1 23.2 19.0 82.0 94.0 24
M 12 22.4 33.7 26.4 98.4 112.8 30
M 14 34.8 46.7 29.0 114.8 131.6 40
M 16 38.8 62.7 49.1 131.2 150.4 50
M 20 71.4 97.9 76.1 164.0 188.0 65
M 24 116.7 141.0 105.4 196.8 225.6 75
M 30 174.5 224.0 164.6 246.0 282.0 85

These are design values for use with BS EN 1993-1-8, and a partial safety factor of ?M2 = 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.

These design resistances are suitable for design to BS EN 1993 and can be compared directly with design loads. The quoted bearing resistances assume k1 = 2.5 and ?b = 1.0. For different arrangements the bearing resistance should be calculated using the expression in Table 3.4 of BS EN 1993-1-8, with d as the nominal diameter of the blind 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.

Stainless Steel Blind Bolts

Blind Bolt Product Specification Stainless Steel A4-70 
Product Code Bolt Size Box
Qty		 Hole
Diameter
Fixing Thickness
Min Max
Anchor
Clearance		 Depth
Clearance		 Minimum
Hole Centers
BB0850A4ASM M8 x 50 50 9 9 24 19 25 20
BB1060A4ASM M10 x 60 40 11 10 30 23 30 20
BB1290A4ASM M12 x 90 20 13 12 55 26 35 25
GBB16100A4ASM* M16 x 100 20 17 13 53 36 43 35
* We strongly recommend the use of our safety gauges when installing these bolts

Stainless Steel Blind Bolt Design to BS 5950
Diameter Tension Capacity
Pt (kN)		 Shear Capacity
Over Thread
Ps, thread (kN)		 Shear Capacity Over Slot
Ps, slot (kN)		 Bearing Capacity
in 10mm Plate		 Recommended
Tightening
Torque (Nm)
        S275
Pb, (kN)		 S355
Pb, (kN)		  
M 8 5.3 10.3 6.5 20.7 24.8 15
M 10 12.7 16.2 11.1 27.6 33.0 22
M 12 21.4 23.6 15.4 32.2 38.5 28
M 16 42.8 44.0 30.1 46.0 55.0 45

These capacities are suitable for design to BS 5950-1 and can be compared directly with factored loads. Bearing resistances for different thicknesses can be calculated by scaling the values given in proportion to the thickness, but should only be used when the end distance is greater than 2d.

Bolts subject to combined tension and shear should satisfy the following expression:

Important Note

Note that the above tension capacities make no allowance for the deformation or yield of the supporting parts.

Stainless Steel Blind Bolt Design to BS EN 1993
Diameter Tension Resistance
Ft,Rd (kN)		 Shear Resistance
Over Thread
Fv,Rd thread(kN)		 Shear Resistance
Over Slot
Fv,Rd slot (kN)		 Bearing Capacity
in 10mm Plate		 Recommended
Tightening
Torque (Nm)
       

S275
Fb,Rd(kN)

 S355
Fb,Rd(kN)		  
M 8 5.3 12.3 7.8 65.6 75.2 15
M 10 12.7 19.5 13.3 82.0 94.0 22
M 12 22.0 28.3 18.4 98.4 112.8 28
M 16 42.9 52.8 36.1 131.2 150.4 45

These design resistances are suitable for design to BS EN 1993 and can be compared directly with design loads. The quoted bearing resistances assume k1 = 2.5 and ?b = 1.0. For different arrangements the bearing resistance should be calculated using the expression in Table 3.4 of BS EN 1993-1-8, with d as the nominal diameter of the blind bolt.

Bolts subject to combined tension and shear should satisfy the following expression:

Important Note

Note that the above tension capacities make no allowance for the deformation or yield of the supporting parts.

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