fero strata product brochure 2013_wriggle-bolts

Wriggle Bolts are a simple and effective system that enables resin bolting in large holes for long-term support.

A Division of Fero Group

Wriggle Bolts

www.fero.com.auAll specifications are applicable at the time of publication and may be amended from time to time.

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It is Fero’s unique wriggle system that makes this bolt so effective. The distorted or wriggled section of the bolt increases the effective diameter of the bolt in order to maximise load transfer and assist in resin mixing. The end-shear assembly assists in shredding resin packaging to eliminate gloving. The wriggle section of the bolt assists in mixing the two component polyester resin capsules – resulting in a solid anchor and additional load transfer. Fero Wrigglebolts are offered with a continuous hot rolled T20 or T25 thread over the entire length of the bar or with a rolled 250mm left hand M24 thread.

Fero also manufacture and supply a de-bonded wriggle bolt. The de-bonded section on the wriggle bolt T20, T25 or N24 prevents grout or resin setting around this section of the bar, allowing for the bolt to yield under strata movement.

Manufactured and supplied from Fero Strata’s Perth and Brisbane operations, wriggle bolts are supplied with a pinned nut and dome ball washer as standard and are bound with steel strap and timber packaging for safe transport. The pinned nut eliminates the need to store loose inventory and provides a ready to use torque nut.

Fero wriggle bolts are manufactured to meet Australia’s high quality standards and are extensively quality tested in-house. Field testing has proven the wriggle bolt to be highly effective in both manual and mechanical operations. Our galvanised product provides additional protection in corrosive environments.

Our technical services team are available to provide technical and product advice, operator training and in-situ-pull testing.

Contact the Fero Strata team for more information at [email protected]

1.0 Wriggle Bolts The Fero wriggle bolt has been specifically designed for use in long-term or permanent strata reinforcing of underground mining and tunnelling excavations. This system is highly effective for operations requiring the advantages of resin anchors.

1.1 Features

Provides solid anchor & additional load transfer

Shear end to cut through resin packaging

The wriggles assist in mixing the resin

Comes standard with torque nut (pinned nut & dome ball washer)

Available in threaded bar version

Available in hot dip galvanised or untreated steel

Available in deformed bar version with a rolled left hand thread

Pinned Nut End

Shear End


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1.2 Wriggle Bolt Range

Fero manufactures and supplies wriggle bolts in a thread bar and deformed bar version with a rolled left hand thread in a range of lengths from 1.2m to 3m or can be custom-made to suit various ground conditions.

The type of ground where wriggle bolts may be used should be evaluated to determine the correct length and diameter of wriggle bolt required. The wriggle bolt system will provide a higher load capacity in unstable ground and soft strata may require a longer anchorage length. Pull tests should be performed to determine yield and resin anchorage capabilities.

Wriggle Bolt T20 and T25 Manufactured as a continuous hot-rolled thread, the 20mm and 25mm thread bar provides support in a variety of hole depths in all ground conditions. The continuous thread on the entire length of the bolt provides greater flexibility when tensioning in a range of hole lengths.

Wriggle Bolt N24 The deformed bar has 250mm of rolled left hand thread providing more threads per centimetre, and a greater load capacity. Fero wriggle bolts are available in galvanised or untreated steel in packs of 100.

Wriggle Bolt De-Bonded The de-bonded section on the wriggle bolt T20, T25 or N24 prevents grout or resin setting around this section of the bar, allowing the bar to elongate when placed under yield.


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Fero Strata manufactures and supplies a range of specifically designed accessories for use with wriggle bolts. It is recommended that wriggle bolts are used with associated Fero Strata products.

For more detailed information talk to one of our team or ask for a Fero Accessories brochure.

Email: [email protected]

2.0 Physical & Technical Properties

3.0 Associated Accessories

T20 Minimum

T20 Typical

T25 Minimum

T25 Typical

N24 Minimum

N24 Typical

Physical Properties

Core Diameter (mm) 19.3 19.5 24.4 24.7 23 23.5

Overall Bar Diameter (mm) 22.2 22.5 28.1 28.5 26 27

Effective Wriggle Diameter (mm) - 31 - 33 - 33

Effective Wriggle Length (mm) - 500 - 500 - 500

Thread Pitch, LHT (mm) - 10 - 12.5 - 3

Hex Nut Size (A/F - mm) - 36 - 41 - 36

Pin Nut - Typical Break out Torque (Nm) - 80 - 80 - 80

Weight Per Metre (kg) - 2.48 - 3.85 - 3.55

Installation Details

Optimum Hole Diameter (mm) - 33 - 35 - 35

Mechanical Properties

Yield Strength (MPa) 500 550 500 550 500 550

Yield Force (Metric Tonne) 15.8 17.3 24.6 27.1 22.5 24.8

Tensile Strength (Mpa) 600 650 600 650 600 650

Tensile Force (Metric Tonne) 18.9 20.5 29.5 32.0 27.0 29.3

Cross sectional area (mm2) - 315 - 492 - 450

Uniform Elongation, Agt (%) 10 12 10 12 5 7

Testing Standards

Material AS4671Galvanising AS4680Threading AS1275


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3.1 Strata Support Plates Range

Fero Strata manufactures and supplies a range of support plates for use with wriggle bolts including:

150mm Dome Plate Dome Plates are primarily used when increased load capacity is required. It is the dome shape of this 150 x 8mm general purpose plate that increases the load capacity. Dome Plates are primarily used in conjunction with domed barrel and wedge or a dome ball washer in the installation of solid bolts and cable bolts. Fero can also supply dome plates in a range of thickness and size as per customer requests.

Duplex Franklin Plate The Duplex Plate is a 5mm thick Franklin Plate welded to a 1.9mm thick 300 x 280mm strata plate, the pressed rib sections in the 1.9mm material provide additional strength and minimise deformation upon installation. The Duplex Plate gives greater surface coverage when supporting strata-mesh or when used directly on rock surface. User friendly round edges for increased safety and mesh protection.

300 Strata Plate This lighter gauge 1.9mm plate is used when greater surface coverage is required in fractured ground. The plate is manufactured with four pressed rib sections on the outer perimeters of the plate to provide more strength to the lighter gauge material. The 300 strata plate can be used with any size bolt and in conjunction with smaller diameter plates.

Franklin Plate Fero’s Franklin Plate is another purpose designed product developed in-house. The Franklin Plate is a 5mm ribbed support plate that provides a high load capacity but is more cost effective and stronger than the similar load bearing capacity 8mm dome plate.

This high load and ribbed support plate is used in conjunction with a domed barrel and wedge or dome ball washer in the installation of wriggle bolts, solid bolts and cable bolts. The ribs provide additional strength to the 5mm material, enabling the plate to carry loads in excess of 200kN – therefore eliminating the need to use an 8mm dome plate.


Hanger Nuts

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Fero supplies a full range of purpose designed driver tools for use with both mechanised and hand-held bolting equipment. Threading meets Australian Standards AS1275. Fero Driver Tools are supplied loose per unit, with other packing quantities available on request. Driver Tools for use with Fero Wriggle bolts include:

Resin Bolt Driver Tools Used for mechanised installation (jumbo) of wriggle bolts and other solid bolts that come standard with a pinned nut. Resin Bolt Drivers are available in R38 or T38 thread and in various lengths (Standard lengths 500mm, 600mm, 720mm and 900mm; with other lengths available upon request and to suit different Hex nut sizes.

Fero can also apply standard driver tools for use with Air-Leg mining equipment. The driver tool is inserted directly into the Air-Leg chuck.

3.2 Driver Tools 3.3 Resin Anchors

Resin anchors are used to secure wriggle bolts and solid bolts to provide roof support in underground mining and tunnelling. Fero supplies an extensive range of resin anchors to suit all types of bolting patterns and strata conditions. (See Resin brochure for more details)

3.4 Resin Anchor Insertion System

Various size tubes and lengths available to suit a range of resin diameters. The insertion system ensures quick, safe, efficient insertion of the resin capsule into the hole. (See Resin brochure for more details)

Resin AnchorDriver Tool

Available in both D series and W series, hanger nuts screw onto the thread of the solid bolt to support cabling and other services. Various nut size and thread combinations are available to suit any rock bolt in the Fero Strata range. We can also customise hanger nuts to suit various applications. Standard sizes and other sizes readily available.

3.5 Hanger Nuts

Fero Product Code

Fero Product Description

Length (mm)

Surface Finish

Weight Each (kg)

Pack Qty

Pack Weight (kg)

FWBT20-1800C Wrigglebolt T20 x 1800 c/w Pinned Nut & Dome Ball Washer 1800 Un-Treated 4.8 100 475



FWBT20-1800CG Wrigglebolt T20 x 1800 c/w Pinned Nut & Dome Ball Washer - HDG 1800 Hot Dip Galvanised 5.0 100 500









FWBN24-1800C Wrigglebolt N24 x 1800 c/w Pinned Nut & Dome Ball Washer 1800 Un-Treated 6.8 100 680



FWBN24-1800CG Wrigglebolt N24 x 1800 c/w Pinned Nut & Dome Ball Washer - HDG 1800 Hot Dip Galvanised 7.3 100 725



4.0 Product Codes, Weights & Pack Sizes


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A Division of Fero Group

For further information and ordering contact: [email protected]

www.fero.com.au

Corporate Office & Manufacturing Facility WESTERN AUSTRALIA44 Chisholm Crescent Kewdale WA 6105Tel: +618 9453 0000 Fax: +618 9453 0050

Manufacturing Facility QUEENSLAND9 Boron Street Narangba QLD 4504Tel: +617 3888 4533 Fax: +617 3888 4790

Branch Locations AUSTRALIAKalgoorlie WABurnie TASBendigo VICMount Isa QLDTownsville QLD

fero strata product brochure 2013_wriggle-bolts

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