Professional Reinforcing STEEL

Nauhria Reinforcing Ltd, established in 1991 and is regarded as one of Aucklands major reinforcing steel suppliers. They are a total rebar product and full service provider who take pride in their continued delivery of high quality, accurate products and services.

Nauhria’s capabilities include a full range of stock length bars to bespoke fabricated Pre-cut’n’bent components, Prefabricated cages, spiral piles and specialised proprietry products and fittings like Reidbar, Ancon and ancillary support items.

Inhouse services include full project takeoff & estimating, Project managment and detailling before advanced automated machines process product to exacting specifications then onsite Hiab delivery throughout New Zealand.

Onsite in-situ rebar tying and placing teams ensure footings, slabs and concrete areas are accurate prepared and ready for inspection and pour in accordance with engineered designs.

Product quality is of paramount importance to Nauhria and their track record of excellence is underpinned by their commissioning of independent compliance monitoring and auditing by SGS NZ ensuring source products remain in full compliance with New Zealand's AS/NZS 4671 standards.

Nauhria Groups purpose is to help build a great and safe New Zealand by providing the best products and services available.

Our Capabilities

Production Capacity

Nauhria Reinforcing operate state of the art leading technology to ensure continuity of fabricated re-bar quality and conformance with the specific requirements of New Zealand's  standards.

  • 5000 m2 Internal production & storage operations
  • 10000m2 Bulk materials storage
  • MAF Certified Import Devanning
  • 2x MEP Syntax Line-28M Straight Stock, Double ended Cut n bend
  • MEP-16 Syntax Coil fed Spiral, Stirrup and Link Machinery.
  • MEP Format-16 Plus
  • MEP Shearline
  • MEP-CS 32 Robotic Bender
  • Electric Benders
  • Electric Shears
  • Radial Former
  • ASA Rebar System
  • Tearproof electromark water proof tagging
  • HIab Deliveries
  • 12-Meter Flat deck Stock length and Prefab cage transporter.

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Reinforcing Products & Services

Reinforcing Technical Section



Nauhria precast is an integral part of New Zealand's construction industry, manufacturing and delivering concrete componenets to the commercial, civil and residential construction sectors. the company specialises in concrete precast wall panels, columns, beams, lintels, stairs, balconies and landings. Nauhria also exclusively manufacture and supply the award-winning Monarc Creative Precast Panels.

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NZ Standards

NZ Standards

Reinforcing Steel should be designed by Professional Engineers in accordance with NZ Standards.

Conforming with the standards will ensure that NZ buildings will perform to keep people safe when faced with New Zealand's unique Climate and Seismic events.

NZ Standard requirements to refer when designing Reinforcing Steel should include:

  • AS/NZS 4671:2019 - Steel reinforcing MaterialsThe AS/NZS 4671 Standard Sets out for New Zealand Steel reinforcing materials (bars, coils and welded mesh). Requirements for chemical, mechanical and physical properties for three different strength grades and the three different ductility classes are also covered. In New Zealand High Tensile Class 500E grade is primarily used.
  • AS/NZS 1554.3:2014 Structural steel welding - Part 3 

    Part 3: Welding of reinforcing steel provides a code for the welding of reinforcing steel. It specifies requirements for the welding of reinforcing steel used in concrete structures that comply with AS 3600 or NZS 3101.1.

    Part 3 applies specifically to the welding of reinforcing steels complying with AS/NZS 4671.


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Material Standard

Material Standard

AS/NZS 4671 was introduced in 2001 and is the joint standard for Steel Reinforcement Materials in New Zealand and Australia.

Specific to New Zealand, AS/NZS 4671:2001 (Page 12, Table 2) stipulates.

 Property 300E
Type of specified value

 Yield stress (Mpa)



> 300
< 380

< 650

CvL: p = 0.95
CvU: p = 0.05


< 1.50
< 1.40

CvL: p = 0.90
CvU: p = 0.10
Uniform elongation

> 5.0


CvL: p = 0.90

AS/NZS 4671 allows for the manufacture of material by both the Quench and Tempered (QT) process and the Micro Alloy (MA) process.


Nat Steel

Natsteel are a wholly owned subsidary of Tata Steel (one of the worlds largest steel producers) and are a leading steel manufacture in the Asia area.  Natsteel posses a vigorous quality management system and are ISO accredited.

Natsteel also hold ACRS Processor and Product Certifications
ref: 'Natsteel Holdings Pty' at for full details.

Bar Types & Bar Markings

Bar Types / Markings

Reinforcing Steel supplied by Nauhria is manufactured by Natseel Singapore and can be clearly identified by Specific markings on the bar in accordance with AS/NZS4671

Instock Product Range:

Bartype (eg: HD16) Description Bar Diameters carried in stock
R (eg. R10) 300E Grade - Round 6mm, 10mm, 12mm, 16mm, 
D (eg. D10) 300E Grade - Deformed 10mm, 12mm, 16mm, 20mm
HR (eg. HR10) 500E High Tensile (MA) - Round 10mm, 12mm, 16mm, 20mm
HD (eg. HD10) 500E High Tensile (MA) - Deformed 10mm, 12mm, 16mm, 20mm
RB (eg. RB10) 500E High Tensile (MA) - Reidbar  10mm, 12mm, 16mm, 20mm, 25mm, 32mm


All grade 500E high tensile bars are manufactured using the Micro Alloy (MA) Process.

For specialised applications - Other bar diameters and product may be available, please enquire with us.  


500E grade (MA) Micro Alloy Deformed Bars.

Minimum Bend Radius

Minimum Bend Radius

Incorrect bending can severely affect the performance of steel reinforcement in service. The result can be premature fracture, which will affect the capacity of the building elements to carry design loads. Of particular concern is the practice of bending reinforcing steel to too small a bend diameter.

Bending then straightening (rebending) the reinforcing on site is of even greater concern.

To avoid fracture or weakening, NZS 3109:1997 Concrete construction requires that hooks and bends are formed in accordance with the bend requirements of Table 3.1. The minimum diameter of bend is measured on the inside of the bar.

Grade, fy (MPa)

Bar type

Bar diameter, db (mm)

Minimum diameter of bend, di (mm)

Plain bars

Deformed bars

300 or 500

Stirrups and ties







All other bars







Note that the above table only gives part of the requirements. For full details of standard hooks, bends, stirrups or ties, for mesh bend diameter requirements and for galvanised bar bend requirements, refer to clause 3.3 of NZS 3109:1997.

Rebending should only be carried out when unavoidable and identified at the design stage. NZS 3109:1997 and NZS 3101.1&2:2006 Concrete structures standard require that rebending is done in the specified manner and to the manufacturer’s requirements.

Specific dimensions by component for your convenience.

MAIN BARS | Minimum Bend Radius


The minimum bend diameter for main bars, measured to the inside of the bar, shall be equal to or greater than five bar diameters (5db) for 6-20mm and six bar diameters (6db) for 25-32mm.

Steel Grade
 Bar Diameter - (Round & Deformed)
 Minimum Bend Diameter 
300E or 500E


 6mm 30mm
 10mm  50mm
 12mm  60mm
 16mm  80mm
 20mm  100mm
 25mm  150mm
 32mm  192mm
STIRRUPS & LINKS | Minimum Bend Radius


The minimum bend diameter for main diameter for main bars, measured to the inside of the bar, shall be equal to or greater than 2-bar diameters for 6-20mm and 3 bar diameters for 25-32mm for plain bar, and equal to or greater than 4-bar diameters for 6-20mm and 6-bar diameters for 25-32mm for deformed bar.

Steel Grade
Bar Diameter
Minimum Bend Diameter  
Round Bar
Deformed Bar
300E or 500E 6mm 12mm 24mm
10mm 20mm 40mm
12mm 24mm 48mm
16mm 32mm 64mm
20mm 40mm 80mm
 25mm 75mm 150mm
32mm 96mm 192mm

If for any reason you believe it is not possible to achieve the minimum bend radius, please seek Engineers' approval before making any adjustments. No adjustments are to be made without engineer approval.

STANDARD HOOKS | Minimum Bend Radius & Hook Length


Standard Hooks

There are three types of standard hooks:

Semi-Circular Hook

A semi-circular turn plus an extension of at least four bar diameters but equal or greater than 65mm at the free end of the bar;

Bar Diameter Minimum Semi-circular Hook Length
 6mm  65mm
 10mm  65mm
 12mm  65mm
 16mm  65mm
 20mm  80mm
 25mm 100mm
 32mm 128 mm

90˚ Hook

A 90˚ turn plus an extension of at least 12 bar diameters at the free end of the bar for a deformed bar and 16 bar diameters for plain bars;

Bar Diameter Minimum 90˚ Hook Length
Deformed Round
6mm 72mm 96mm
10mm 120mm 160mm
12mm 144mm 192mm
16mm 192mm 256mm
20mm 240mm 320mm
25mm 300mm 400mm
32mm 384mm 512mm

Stirrup Hook

A 135˚ turn around a longitudinal bar plus an extension of at least six stirrup bar diameters for deformed bars and eight stirrup bar diameters for plain bars at the free end of the bar embedded in the core concrete member.

Bar Diameter Minimum 90˚ Hook Length 
Deformed Round
6mm 72mm 96mm
10mm 120mm 160mm
12mm 144mm 192mm
16mm 192mm 256mm
20mm 240mm 320mm
25mm 300mm 400mm
32mm 384mm 512mm
PIle Splices

Pile Splices

NZ 3101 and 3109 require the anchorage of all pile splices/laps to be one of the following:

  • A 135˚ hook (as per a stirrup hook)
  • A welded lap splice
  • A mechanical connector

The above technical data is taken from the Standards 3101 and 3109, full copies are available from Standards New Zealand. Or contact us for further information.

Calculating Rebar Weights

Calculating Rebar Weights

NB: All calculations are external dimensions

Calculating Weights (in kg)

To calculate the weight of a bar: take the length of the bar and multiply it by the factor below corresponding to the bar diameter.

Bar size Kg/metre
6mm 0.222
10mm 0.617
12mm 0.888
16mm 1.578
20mm 2.466
25mm 3.853
32mm 6.313
40mm 9.865

Stirrups - Calculating the Cut Length

Length of the bar = (2 x A) + (2 x B) + C

6mm = 100mm
10mm = 120mm
12mm = 150mm
16mm = 180mm

Links - Calculating the Cut Length

Length of bar = A + C

6mm = 150mm

10mm = 200mm
12mm = 250mm
16mm = 300mm
20mm = 360mm

Legs - calculating the Cut Length

Length of bar = A+ B - C

6mm = 10mm
10mm = 25mm
12mm = 30mm
16mm = 40mm
20mm = 50mm
25mm = 70mm
32mm = 90mm

Mesh Substitution

Mesh Substitution

In some instances it may be possible to substitute a ductile mesh products with a more cost effective ductile mesh equivalent product.

Substitution mesh can reduce overlaps adding to economic savings to the mesh component of a project.

Substitutions can accomodate variability in bar diameter requiring less bar and larger spacing between bars without comprimising the minimum total steel reinforcing applied to the application.

All substitutions are subject to product availability and engineers approval.

Mesh Conversion Factors:

Smooth wire fabric/Ribbed wire fabric
Sectional Area Bars/Meter Sectional Area/Meter
668 4.00mm 12.571mm2 1000/150 6.667 12.571 x 6.667 83.811mm2
84 5.60mm 24.640mm2 1000/300 3.333 24.640 x 3.333 82.125mm2
665 5.30mm 22.071mm2 1000/150 6.667 22.071 x 6.667 147.147mm2
147 7.50mm 44.196mm2 1000/300 3.333 44.196 x 3.333 147.305mm2
664 6.00mm 28.286mm2 1000/150 6.667 28.286 x 6.667 185.582mm2
188 7.50mm 44.196mm2 1000/235 4.255 44.196 x 4.255 188.054mm2
663 6.30mm 31.185mm2 1000/150 6.667 31.185 x 6.667 207.910mm2
212 9.00mm 63.643mm2 1000/300 3.333 63.643 x 3.333 212.122mm2
662 7.10mm 39.608mm2 1000/150 6.667 39.608 x 6.667 264.067mm2
265 9.00mm 63.643mm2 1000/240 4.167 63.643 x 4.167 265.200mm2
661 7.50mm 44.196mm2 1000/150 6.667 44.196 x 6.667 294.655mm2
295 9.00mm 63.643mm2 1000/215 4.651 63.643 x 4.651 296.004mm2

Terms & Conditions - Reinforcing

Terms of Trade

Nauhria Reinforcing Terms & Conditions are provided with all quotations and establish an agreed level of expectations for all parties to agree upon.

The document also provides trade specific consideration and interpretation to generic clauses contained in subcontract agreements for the purpose of providing clarity and avoidance of doubt as to their interpretation.

In the event a subcontract shall become in effect they are to be included as subcontract documents for the address of any clauses not contained nor provided for in the Subcontract documents.

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Nauhria Group Policies

Company Policies - Nauhria Group

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Balcrom Reinforcing Ltd

Located in Walter Cres' Cromwell in the South Island of NZ, Balcrom Reinforcing Ltd is a joint venture between the Nauhria Group and Balcrom Precast Owner and Managing Director - Phil Bates.

Balcrom Reo services New Zealands Southern Region of the South Island   with a full range of Reinforcing Products and services.

Baclrom are able to provide a full package for both Precast and Reinforcing Steel products and services for any project.  

Call us on 09 262 1065