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Heavy Duty Bolt

The Heavy Duty Bolt (HD) is a shorter blind fixing which provides improved performance when the shear plane of the materials being fixed falls across the legs of a standard Blind Bolt.

A HD Bolt is the perfect solution when heavy weight steel sections need to be fixed in place. The straightforward activation process requires no specialist equipment, needing just a spanner and hammer to set the unique pin locking mechanism. Thanks to this, the Heavy Duty Bolt can save both time and money during installation.

Advantages of Using The Heavy Duty Bolt:

  • Installation is quick and simple
  • An oversized hole is not needed
  • The Zinc Flake 1000Hr SSP coating offers 1000 hours of salt spray protection
  • Increased efficiency for any assembly
  • Unique pin locking activation

If you require solutions for a specific project then please contact us using the details given below. We’ll listen and set out just how using Blind Bolts could help you. For detailed information on installation, please view our Heavy Duty Bolt Installation guide, Heavy Duty Bolt Fitting Instructions.

Heavy Duty Bolts

HEAVY DUTY BOLT

Technical Details

Heavy Duty Blind Fastener

NOTE: All dimensions are in mm unless stated otherwise.

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

Heavy Duty Product Specification Zinc Flake 1000Hr SSP

Product Code
Bolt Size
Hole Diameter Fixing Thickness Depth Clearance

Corrosion Protection

Salt Spray (hours)

Min Max
HD0845ZF M8 x 45 8 7 25 10 Zinc Flake 1000Hr SSP
HD1045ZF M10 x 45 10 7 25 12 Zinc Flake 1000Hr SSP
HD1060ZF M10 x 60 10 7 40 12 Zinc Flake 1000Hr SSP
HD1245ZF M12 x 45 12 8 22 15 Zinc Flake 1000Hr SSP
HD1260ZF M12 x 60 12 8 34 15 Zinc Flake 1000Hr SSP
HD1275ZF M12 x 75 12 8 48 15 Zinc Flake 1000Hr SSP
HD1660ZF M16 x 60 16 12 30 25 Zinc Flake 1000Hr SSP
HD1675ZF M16 x 75 16 12 45 25 Zinc Flake 1000Hr SSP
HD2070ZF M20 x 70 20 15 32 30 Zinc Flake 1000Hr SSP
HD2085ZF M20 x 85 20 15 47 30 Zinc Flake 1000Hr SSP

Design Resistance for HD Type Blind Bolts
Design to BS EN 1993-1-8
Zinc Flake 1000Hr SSP

Bolt Size Tensile (kN) Single Shear (kN) Recommended Pre-load
Tightening Torque (Nm)
M8

8.5

13.6 20
M10 25.2 21.9 35
M12 46.4 32.2 45
M16 57.5 60.8 95
 M20  77.5 95.5  120

Important Note

The above resistances are equally appropriate for designs to BS 5950

Stainless Steel HD Bolts

Heavy Duty Product Specification
A4-70 STAINLESS STEEL

Product Code
Bolt Size
Hole Diameter Fixing Thickness Depth Clearance
Min Max
HD0845SS M8 x 45 8 7 25 10
HD1045SS M10 x 45 10 7 25 12
HD1060SS M10 x 60 10 7 40 12
HD1245SS M12 x 45 12 8 22 15
HD1260SS M12 x 60 12 8 37 15
HD1660SS M16 x 60 16 12 30 25
HD2070SS M20 x 70 20 15 32 30

Design Resistance for HD Type Blind Bolts
Design to BS EN 1993-1-8
A4-70 STAINLESS STEEL

Bolt Size Tensile (kN) Shear (kN) Recommended Pre-load
Tightening Torque (Nm)
M8

10.5

11.5 18
M10 20.2 18.4 24
M12 31.4 27.1 30
M16 40.1 51.1 45
M20 68.7 80.2 80

Important Note

The above resistances are equally appropriate for designs to BS 5950

HEAVY DUTY BOLT

Testing Terms Explained

Heavy Duty Bolt Technical Data

The HD Bolt has an innovative and unique design. This means that anyone using them has to be aware of exactly how the dimensions of the bolts are measured, and the way in which these measurements are used during fitting.

The image above shows a pictorial representation of these measurements, while the details are set out below.

If you have further questions on the fixing terms of Blind Bolts please get in touch with us. Use the contact details at the bottom of the page or click here to send us an email.

HEAVY DUTY BOLT

Fitting Instructions

The following videos visually represents the detailed installation of the Heavy Duty Bolt.

HD Bolt Installation Instruction

HD Bolt fitting instructions

HD Bolt Installation Instruction (PDF Download)