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.
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Blind Bolt Product Specification Geomet 500B - Property Class 10.9 |
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| Product Code | Bolt Size | Box Qty |
Hole Diameter |
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Anchor Clearance |
Depth Clearance |
Minimum Hole Centers |
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| 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 | ||||
| BB1270DTASM | M12 x 70 | 20 | 13 | 12 | 35 | 26 | 35 | 25 | ||||
| BB12120DTASM | M12 x 120 | 25 | 13 | 30 | 85 | 26 | 35 | 25 | ||||
| BB12180DTASM | M12 x 180 | 20 | 13 | 80 | 140 | 26 | 35 | 25 | ||||
| GBB1690DTASM | M16 x 90* | 20 | 17 | 13 | 43 | 36 | 43 | 35 | ||||
| GBB16130DTASM | M16 x 130* | 15 | 17 | 40 | 75 | 36 | 43 | 35 | ||||
| GBB16180DTASM | M16 x 180* | 10 | 17 | 55 | 125 | 36 | 43 | 35 | ||||
| GBB20110DTASM | M20 x 110* | 10 | 22 | 21 | 56 | 44 | 56 | 48 | ||||
| GBB20140DTASM | M20 x 140* | 8 | 22 | 21 | 86 | 44 | 56 | 48 | ||||
| GBB20180DTASM | M20 x 180* | 10 | 22 | 80 | 120 | 44 | 56 | 48 | ||||
| GBB20250DTASM | M20 x 250* | 10 | 22 | 130 | 185 | 44 | 56 | 48 | ||||
| GBB24130DTASM | M24 x 130* | 5 | 26 | 21 | 66 | 53 | 64 | 60 | ||||
| GBB30140DTASM | M30 x 140* | 5 | 32 | 27 | 60 | 65 | 72 | 75 | ||||
| * 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.
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Blind Bolt Design Capacities NZS 3404:1997 or AS 4100:1998 |
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| Diameter | Tension Capacity Φ'Ntf (kN) |
Shear Capacity Over Thread Φ'Vf (thread) (kN) |
Shear Capacity Over Slot Φ'Vf (slot) (kN) |
Recommended Tightening Torque (Nm) |
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| M8 | 6.9 | 14.6 | 11.1 | 15 | |
| M 10 | 12.9 | 23.2 | 19.0 | 24 | |
| M 12 | 18.8 | 33.7 | 26.3 | 30 | |
| M 16 | 40.1 | 62.7 | 51.5 | 50 | |
| M 20 | 57.8 | 97.9 | 76.1 | 65 | |
| M 24 | 82.3 | 141.0 | 105.4 | 75 | |
| 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 | |||||
The bearing capacity of the ply should be calculated in accordance with the design Standard, based on the nominal diameter df of the bolt. No reduction for the slot is necessary. Bolts subject to combined shear and tension should be verified in accordance with the design Standard, using the values of Φ'Vf (slot) and Φ'Ntf from the table above. The above design values were prepared by SCI, UK, following a program of tests. Design values verified by HERA, NZ are shown below
| Diameter | Tension Capacity Φ'Ntf (kN) |
Shear Capacity Over Slot Φ'Vf (slot) (kN) |
| M 10 | 12.0 | 20.6 |
| M 20 | 63.7 | 122.5 |
| M 24 | 86.7 | 202.6 |
| 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 Technical Data
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Blind Bolt Product Specification Stainless Steel A4-70 |
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| Product Code | Bolt Size | Box Qty |
Hole Diameter |
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Anchor Clearance |
Depth Clearance |
Minimum Hole Centers |
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| 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 | ||||||||||||
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Stainless Steel Blind Bolt Design to BS 5950 |
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| 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) |
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| S275 Pb, (kN) |
S355 Pb, (kN) |
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| 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 | |
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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:  |
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Stainless Steel Blind Bolt Design to BS EN 1993 |
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| 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) |
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S275 |
S355 Fb,Rd(kN) |
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| 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 | |
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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 αb = 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:
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