Technical Data

Blindbolt Logo

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 Technical Data

Blind Bolt Product Specification Geomet 500B - Property Class 10.9

Product CodeBolt SizeBox
Qty
Hole
Diameter
Fixing Thickness
MinMax
Anchor
Clearance
Depth
Clearance
Minimum
Hole Centers
BB0850DTASMM8 x 50509924192520
BB1060DTASMM10 x 6040111030233020
BB1095DTASMM10 x 9520112565233020
BB10130DTASMM10 x 130201155100233020
BB1270DTASMM12 x 7020131235263525
BB12120DTASMM12 x 12025133085263525
BB12180DTASMM12 x 180201380140263525
GBB1690DTASMM16 x 90*20171343364335
GBB16130DTASMM16 x 130*15174075364335
GBB16180DTASMM16 x 180*101755125364335
GBB20110DTASMM20 x 110*10222156445648
GBB20140DTASMM20 x 140*8222186445648
GBB20180DTASMM20 x 180*102280120445648
GBB20250DTASMM20 x 250*1022130185445648
GBB24130DTASMM24 x 130*5262166536460
GBB30140DTASMM30 x 140*5322760657275
* 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.

Blind Bolt Design Capacities NZS 3404:1997 or AS 4100:1998

DiameterTension Capacity
Φ'Ntf (kN)
Shear Capacity
Over Thread
Φ'Vf (thread) (kN)
Shear Capacity
Over Slot
Φ'Vf (slot) (kN)
Recommended
Tightening
Torque (Nm)
M86.914.611.115
M 1012.923.219.024
M 1218.833.726.330
M 1640.162.751.550
M 2057.897.976.165
M 2482.3141.0105.475
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

DiameterTension Capacity
Φ'Ntf (kN)
Shear Capacity
Over Slot
Φ'Vf (slot) (kN)
M 1012.020.6
M 2063.7122.5
M 2486.7202.6
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

Blind Bolt Product Specification Stainless Steel A4-70 

Product CodeBolt SizeBox
Qty
Hole
Diameter
Fixing Thickness
MinMax
Anchor
Clearance
Depth
Clearance
Minimum
Hole Centers
BB0850A4ASMM8 x 50509924192520
BB1060A4ASMM10 x 6040111030233020
BB1290A4ASMM12 x 9020131255263525
GBB16100A4ASM*M16 x 10020171353364335
* We strongly recommend the use of our safety gauges when installing these bolts

Stainless Steel Blind Bolt Design to BS 5950

DiameterTension 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
P
b, (kN)
S355
Pb, (kN)
 
M 87.710.36.520.724.815
M 1014.316.211.127.633.022
M 1220.823.615.432.238.528
M 1643.544.030.146.055.045

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:



Stainless Steel Blind Bolt Design to BS EN 1993

DiameterTension Resistance
Ft,Rd (kN)
Shear Resistance
Over Thread
Pv,Rd,thread(kN)
Shear Resistance
Over Slot
Fv,Rd,slot (kN)
Bearing Capacity
in 10mm Plate

Recommended
Tightening
Torque (Nm)

    

S275
Pbs (kN)

S355
Pbs (kN)
 
M 87.712.37.865.675.215
M 1014.319.513.382.094.022
M 1220.828.318.598.4112.828
M 1643.552.836.1131.2150.445

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 inαTable 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: