Precision Engineered Helical Bars – Wall Ties and Fixings

Diameter CSA (mm2) 0.2% Proof Stress (N/mm2) Ultimate Tensile Strength (N/mm2) Mean Tensile Capacity #
5mm 6mm2 >880N/mm2 1025-1225N/mm2 7kN
6mm 8mm2 >870N/mm2 1025-1225N/mm2 9kN
7mm 10mm2 >880N/mm2 1025-1225N/mm2 11kN
9mm 16mm2 >850N/mm2 1025-1225N/mm2 17kN
12mm 28mm2 >820N/mm2 1025-1225N/mm2 20kN

* Mean Tensile Capacity derived from CSA x UTS
* Ultimate Tensile Strength is measured within a calibrated tolerance of +/- 2%
Download Materials Technical Specifications


Features Benefits
Patented Precise Pitch Technology
(EP 1307303B1)
Stronger – Reliable – Faster Installation
Accurate Tracking Across Wide Cavities
Balance Robust Profile Greater Torsional Strength
Increased Compression Resistance
(Reduces Buckling Tendencies)
Manufacturing Innovative Design – Precise Engineering
Full In House Control Continuous Improvements over 30 years

* Seismic Movement Test Report by Oxford Brooks University UK (Available upon request)
* OISD Technology – Oxford Institute for Sustainable Development
* UKAS -ce icon Mark Test Reports available upon request



Thor Helical’s leading reputation relies upon perpetual product development, innovative design and manufacturing excellence. Its helical bars, wall ties and insulation fasteners are manufactured under one roof in the UK’s only production facility that has all the skills necessary to transform round feed-wire into finished roll-profiled helical fasteners, delivering unrivaled and patented product consistency.



Crack Stitching – Remedial Wall Ties – Grout Free Wall Anchors – Masonry Reinforcement Bar
Thor Helical – AISI316 Grade Austenitic Stainless Steel Helical Bar

Thor NTC Grout for Crack Stitching, Masonry Reinforcement
and Specific Wall Tie Applications.

Thor NTC Grout is a thixotropic cementitious grout and incorporates a special blend of cement and fillers, 10% silica fume and additives to form a cementitious grout which is highly durable, low chloride content, low porosity, aluminium and metallic expansion agent free and is a one component cement powder which only requires the addition of water to form a thixotropic cementitious grout. The 10% silica fume provides added density and durability for 100 year design life.

The combination of Thor Helical reinforcement bars with the Thor NTC Grout provides a stabilisation system sympathetic to active structures such as masonry. Thor NTC grout allows a degree of flexibility compensating for natural expansion and contraction. Higher strength grouts, polyester and epoxy adhesives may restrict natural masonry movement and induce further cracking within adjacent areas.


Experience has shown that cement based grouts work most effectively with metal reinforcement. Polyester or epoxy and sand grouts are also used in some circumstances but have a mismatch of thermal and moisture movement characteristics, and Youngs modulus with metals, which makes them less effective.

Physical Properties Compressive Strength 
4 Days 20 MPa
7 Days 60 MPa
28 Days 80 MPa


Thor NTC Grout Tubs Indicative Usage Rates

Thor NTC 1.5 litre grout tub Approximate usage = 5 lineal metres
Thor NTC 3.0 litre grout tub Approximate usage = 10 lineal metres
Thor NTC 4.5 litre grout tub Approximate usage = 15 lineal metres
Thor NTC 12 litre grout tub Approximate usage = 40 lineal metres


Thor NTC Grout – 1.5, 3.0, 4.5 & 12 Litre Tubs

ThorBond Water Resistant Concrete Bonding Agent and Additive – 500ml, 5L & 20L