Many projects benefit from high strength bolts equivalent to A490 that are also hot dipped galvanized. Thought it couldn't be done? It couldn't, until now! High strength, hot dipped galvanized bolts equivalent to A490 are used around the world in the most demanding environments. These include thousands of wind towers erected across the United States. Hot Dipped, A490 equivalent bolts also can be found in some of the worlds tallest buildings where critical fasteners are vital. For the first time, these high performance bolts are available in the U.S. You will fast appreciate the strength of these newly accessible German bolts while your clients realize long term maintenance cost savings - two features you won't find in your everyday bolt. Engineers considering 150KSI hot dip galvanized fasteners will find the following benefits for their project: Highest corrosion resistance achieved with hot dip galvanization HV fastener sets (bolt, nut and washers) designed as one unit with close tolerances Suitability for preloading of the set calibrated by the manufacturer More Efficient connection design possibilities with more size options than ASTM A490 Excellent lot traceability of each set due to ID mark on the fasteners Steel Works Bolt Company 549 Heimer Rd San Antonio, TX 78232 Brad Dove 702-290-9625 brad@steelworkbolts.com

1. HV Sets- HDG, A490 equivalent
High-Strength Structural Bolting
Assemblies for Preloading
- Made in Germany -
August Friedberg GmbH
Developing Fasteners since 1884
NASCC 17-19. April 2013

2. Introduction
Engineers considering 150KSI hot dip galvanized fasteners will find
the following benefits for their project:
 Highest corrosion resistance achieved with hot dip galvanization
 HV fasteners set designed as one unit
 Suitability for preloading of the set calibrated by the manufacturer
 Efficient connection design with more options than ASTM A490
 Excellent lot traceability of each set due to ID mark on the fasteners
Saving assembly time and costs
Reduction of maintenance costs
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3. Product Standards
Relevant standards for hot dip galvanized fasteners
EN 14399-1: General Requirements
EN 14399-2: Suitability test for preloading
EN 14399-4: Hexagon bolt and nut assemblies M12-M36
EN 14399-6: Plain chamfered washers M12-36
EN 14399-8: Hexagon fit bolt and nut assemblies M12-M36
EN 14399-9: Direct tension indicators for bolt and nut assemblies
DASt-Guideline 021: Hexagon bolting assemblies M39-M64
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4. Introduction
HV Sets are currently utilized around the world in the most
demanding environments in steel structures.
These include thousands of onshore and offshore wind towers
erected across the United States. Global players in the wind
industry including- General Electric, Vestas and GAMESA have
trusted FRIEDBERG to supply hot dip galvanized bolts and
double ended studs for decades.
They can also found in some of the world's tallest buildings,
bridges, offshore platforms and most roller coasters where
critical fasteners are vital.
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5. Also that which is BREATH-TAKING is
built on TRUST.
World Wide Projects
Windpark Veltins-Arena Köhlbrand-Bridge Hamburg
Horns Reef, Denmark
Different roller coasters
Diamond of Istanbul Commerzbank tower Gasometer Oberhausen Burj al Arab
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6. Hot Dip Galvanization
Hot Dip Galvanization
You may be concerned that hot dip galvanization of high
strength fasteners will cause hydrogen and liquid metal
induced embrittlement.
This process has been refined for over 60 years, so let us show you
how it works with high certainty!
Key points for manufacturing HDG HV Sets:
 Utilizes a unique high quality raw material steel alloy
 Highly controlled, precision manufacturing processes
 Highly controlled hot dip galvanization processes
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7. Hot Dip Galvanization
Essential Parameters:
 Restriction of phosphorus P and sulfur S in the raw material
 Limiting the non-metallic inclusions in the raw material
 Avoid using d-Ferrite due to insufficient pretreatment/cleaning
 Precision heat treating that avoids carburization
 Restriction of the maximum tensile capacity to 1170 N/mm²
 Restriction of the maximum surface hardness to 375 HV 0.3
 Use of proven inhibitors in the pickling bath
 Limiting the pickling time
 Defined zinc bath concentration according to DASt Guideline 022
 Defined zinc bath temperature range depending on the bolt size
 … Long established manufacturer and galvanizer know-How !!!
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8. Hot Dip Galvanization
Schematic HDG Process Steps
Degreasing with prior shot blasting (optional)
Acid pickling (defined inhibitors, acid concentration, pickling time)
Tempering process if necessary
Application of a special flux material with subsequent drying phase
Zinc Bath Dip (defined zinc bath consistence and dipping time)
Centrifuge process to avoid zinc residuals mainly in the threads
Quenching to reduce undefined layer growth and similar optical appearance
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9. Hot Dip Galvanization
Geometrical bolt optimization
Larger wrench size
for uniform stress concentration under head
Larger under head radius for lower notch effect
special rounded thread run-out for decreasing
notch effect
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10. Corrosion Resistance
Hot dip galvanized coatings usually used for EN high-strength
structural bolting assemblies and zinc flake coating for ASTM
when exposed to extreme outdoor conditions (pictures show
condition after 2 years offshore conditions)
Hot dip galvanization zinc flake coating
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11. EN – ASTM Comparison
Size variation and corrosion protection
EN 14399-4 ASTM A490
M12 ---
M16 5/8”
M20 3/4”
M22 ---
Size Range M24 7/8”
M27 1”
M30 1 1/8”
M36 1 3/8”
M39 – M64 (DASt Guideline 021) Not Available(1 1/2” - 2 1/2”)
As processed As processed
Surface finish Hot dip galvanization Hot dip galvanization not avail.
Other coatings to be agreed Zinc flake coatings
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12. ENASTM Comparison
EN – – ASTM Comparison
Design Values (Example M20 vs. ¾”)
EN 14399-4 ASTM A490 equivalent
Size M20 ¾“
Available Tensile Capacity Minimum tensile strength 150 ksi
ASD (W=2) [kips] 27.54 25.00
LRFD (f=0,75) [kips] 41.31 37.40
Available Shear Capacity Loading X (threads excluded)
ASD (Wv=2) - S/D [kips] 20.45 / 40.90 18.55 / 37.09
LRFD (f=0,75) [kips] 30.68 / 61.36 27.82 / / 55.64
Slip Critical Connection STD – Standard Hole
ASD (Wv=2) - S/D [kips] 9.48 / 18.97 9.23 / 18.46
LRFD (f=1,0) [kips] 14.23 / 28.45 13.84 / 27.69
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13. Traceability
Further specifics are a fully traceability of fasteners
Friedberg Fasteners have their own brain.
The entire manufacturing process is fully
traceable from the Material Test Reports of
the raw materials, the manufacturing
processes, heat treatment and the
galvanizing.
All information for each production batch
manufactured is fully documented going back
over 20 years.
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14. Bolt Traceability
Manufacturer ID Friedberg
Manufacturer ID
Opt. torque values > M36
Manufacturing Batch
System HV Property class
Property Class
Manufacturing year
System HV:
High strength for defined preloading
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15. Traceability
Manufacturer ID
Manufacturer ID AF: Friedberg
Tolerance oversized
Certification CE-sign
System HV
Manufacturing
batch(1) and year (T)
Property Class
HV-Nuts are hot dip galvanized, tapped after galvanization process and afterwards
lubricated by the manufacturer to a calibrated torque-tension relation. No additional
lubrication on site is necessary and should be avoided! Threads are oversized to a
tolerance grade 6AZ according to ISO 965-5 and therefore marked with sign „Z“.
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16. Washer Traceability
Marking H or HV
System HV
Certification CE-sign
Manufacturer ID
Manufacturer ID AF: Friedberg
Marking of the washer on its bearing surface. Washer shows internal and external
chamfers. Chamfers are oriented to the hexagon bolt head and nut bearing surface.
The external chamfer shows the existence of an internal chamfer for this system.
Traceability through the delivery notes.
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17. In-House Manufac. Processes
Friedberg Professional Competence
 Cold forming of bolt sizes up to M36
 Hot forging of bolts up to M72 and nuts up to M42
 In house heat treatment processes in continuous and batch type furnaces
 Various threading machines
 Computer aided mechanical machining/turning centers for customized parts
 Surface coatings at ISO certified companies and under Friedberg surveillance
 Hot dip galvanization acc. to ISO 10684
 Zinc flake coatings acc. to ISO 10683
 Electroplated coatings acc. to ISO 4042
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18. Delivering in branches…
Steel
Wind Industry Automotive Industry
Construction
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19. Company Overview
August Friedberg GmbH
Headquarter Gelsenkirchen, Germany
Sales / Production Sales Offices
(South America) (Commission merchant for the German production facilities)
Production facilities
A. Friedberg do Brasil Formteil- und Prepart GmbH August Friedberg
Friedberg Produktions- Schraubenwerk August Friedberg Asia Inc.
Ind. E Com. Ldta. gesellschaft mbH Lichtenfels- Americas Inc.
Finsterwalde GmbH Busan (South Korea)
Monte Mor (Brazil) Gelsenkirchen (GER) Goddelsheim (GER) Cleveland (USA)
Finsterwalde (GER)
Indianapolis (USA)
Warehouse
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20. Thank you for your attention
Contact
August Friedberg Americas Inc.
1250 Linda Street
Rocky River, OH 44116
USA
August Friedberg GmbH
Achternbergstraße 38A
D-45884 Gelsenkirchen
Germany
Tel.: +49 209 9132 - 0
Fax: +49 209 3132 - 178
Email: info@august-friedberg.de
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