AS 1252: 2016 · Nut:AS1252- 2016 2. Mechanical Prooerties Washer:AS1252- 2016 2.1 Bolt ......

NYLOC DRiLLX TDX Conxtruct XBolt ClawBolt TygaBolt SampsonRod 1

Hobson Engineering Volume 33

Engineering

HOBSON NEWS

On LocationEngineering Product Application

www.hobson.com.au NYLOC DRiLLX TDX Conxtruct XBolt ClawBolt TygaBolt SampsonRod 1

AS 1252: 2016 Part 1 & Part 2. A very brief overviewFrom the desk of Peter Hobson

Part 1

This 2016 issue of AS 1252 significantly raises the Quality bar over the 1983/1996 standards, and when product is supplied that adheres to it, will result in higher quality structural assemblies.

Our technical team has a number of technical bulletins available and are also available to answer in depth questions, however this article is purely to give a simple overview of key matters.

The most significant aspect of the 2016 standard is the addition of a mandatory assembly test. The assembly test requires all components of a structural assembly (bolt, nut and washer) to be tested together. Where the nut is on the actual bolt (and not a mandrel) and the rotation is made. Test results of the assembly test give the truest indication of how that batch/

lot/heat number of fasteners will perform in the field. It is a gruelling test that is designed to test many quality aspects of the structural assembly to provide a statistical indication that the batch is fit for purpose. Five samples are required to be tested from each diam x length x batch. Most product seen in the Australian market supplied to the 1983/1996 standard will not consistently be able to pass this test.

The assembly test is time consuming and specialised calibrated equipment is required to carry out the test to the standard and therefore adds extra cost to the product. Testing must be done at an ILAC accredited laboratory. In fact, a lot of the increased cost of supplying product to the 2016 issue is in the QA testing and subsequent test reports that are mandatory. Hobson Product conforms completely to Part 1.

Part 2: Independent Verification Testing

Unfortunately, Part 2 does require a number of tests that are not practical or commercially sensible. It was envisaged an amendment would be issued to rectify these issues,

Continued

AS 1252: 2016 1-2

K0 Documentation 3-4

On Location 5

Using Chainlinks 6

Bumax 7-10

On Location 11

In this issue

HOBSONNEWS

www.hobson.com.auNYLOC DRiLLX TDX Conxtruct XBolt ClawBolt TygaBolt SampsonRod 2

however this has not occurred to date. Hobson Engineering introduced an expectation of independent testing on 1983/1996 product and is again leading the industry with the 2016 standard. We have adopted the sensible anticipated amendments to Part 2 which we refer to as mandatory tests or fit for purpose. Our position is backed by AEFAC and Swinburne University (documents can be provided). In brief, we carry out all current testing requirements of Part 2 with the following exceptions:

Dimensional Testing

This has already been done in Part 1, and the assembly test ensures product is fit for purpose and ensures major dimensions such as AF are correct via the socket test.

We do however measure the washer dimensions, as these are not confirmed with the assembly test and are very important for the assembly to perform correctly.

Surface Integrity Testing

An extremely expensive test on HDG items. The coating has to be

removed by either acid or sand blasting, both of which alters the dimensions of the item. If there are critical surface discontinuities in the product, the assembly test will expose them.

Hardness Testing eight samples of washers and nuts

We test three pieces, as eight pieces is illogical when we are testing only three of the bolts. Again, any issues are highlighted in the assembly test. Remember that these items are sold as assemblies, so eight assemblies would need to be sent to the ILAC lab instead of three. Considering the volume AS 1252 product is sold, this is a significant cost and offers no improvement in quality confidence.

Hobson Test Reports Anti Fake feature and improved traceability over the requirements of the standard

Every AS 1252: 2016 bolt product we sell has a unique trace code to ensure full traceability once the product leaves the carton. This trace code can be entered into our website at ANY time in the future to recall all the supporting documentation. This is a Hobson initiative leading the way in supporting market confidence in Structural Bolting.

To ensure that the correct product is tested (very easy to fake), we show a photo of every bolt head on each Part 2 verification report. See below.

Product may be ordered to part 1, but it is HIGHLY recommended by Hobson Engineering, AEFAC and ASI that all product be ordered to Part 1 & Part 2 (mandatory, fit for purpose).

Engineering

Steel construction washers (SC-washers)Based on the leading Nord-Lock wedge-locking technology, the Nord-Lock SC-washers are specially designed for steel construction applications and to fit EN 14399: 2005 K2 8.8 HR Structural Assemblies.

Nord-Lock SC-washers are designed to directly replace standard washers according to EN 14399. The torque requirements have to be adjusted accordingly to specific torque guidelines for HR bolts.

For more info on the torque guidelines for your application refer wwwhobsoncomau/nord-lock-sc-washers

No loosening in steel structures

www.hobson.com.au

HOBSONNEWS


Ningbo Zhongji Inspection of Machinery Parts Co,LtdT E S T R E P O R T

Report numberZMTC/JC-2017-4-WG2-2(Z)

Page 5 of 6

Sample Picture

THE END

Ningbo Zhongji Inspection of Machinery Parts Co,LtdT E S T R E S U L T


Page 4 of 6

NO Test ItemsTest Method

RequirementTest Results

Item Conclusion

67

NutHardness HRC

AS/NZS 1252.2:2016AS/NZS 1252.1:2016 2436

1#30.2

Pass

2#31.2

3#31.0

4#31.6

5#31.4

6#30.4

7Washer

Hardness HRC

AS/NZS 1252.2:2016AS/NZS 1252.1:20163341

1#34.4

Pass

2#34.8

3#34.4

4#34.8

5#34.9

6#34.28

AssembliesAssembly

testAS/NZS 1252.2:2016AS/NZS 1252.2:2016

bolt tension force183 kNNut rotationDegrees 240

1# 203 kN 245

Pass

2# 212 kN 245

3# 197 kN 245



Page 3 of 6


RequirementTest Results Item

Conclusion

4 BoltCoating(m)

AS/NZS 1252.2:2016AS/NZS 1252.1:2016

Minimum average 50mMinimum individual 40m

1#

88.0

Average

87

Pass

86.676.0

93.089.5

2#

90.5

Average

80

75.071.9

80.381.3

3#

92.8

Average

90

89.487.1

88.092.5

5 NutProof load test

AS/NZS 1252.2:2016 AS/NZS 1252.1:2016

Proof load 285.4 kNand shall be maintained for 15 s and then released.The nut shall be removed using the fingers from the test mandrel

1#The nut be removed using the fingers

Pass





Page 2 of 6


RequirementTest Results Item

Conclusion1

Bolt Ultimate tensile strength

N

AS/NZS 1252.2:2016AS 4291.1-2015 203 000

1# 232 100

Pass

2# 233 700

3# 234 000

2 BoltProof load test

AS/NZS 1252.2:2016AS 4291.1-2015

Proof load 147 000 N, The total length of the fastener after unloading, shall be the same as before loading, within a tolerance of 12.5 m allowed for uncertainty of measurement

1#+5 m

Pass

2#+4 m

3#+6 m

3Bolt

Surface integrity-non-destructive

AS/NZS 1252.2:2016AS 4291.1-2015Should not find surface defect

1#

Six sample not find surface defect Pass

2#

3#

4#

5#

6#

Ningbo Zhongji Inspection of Machinery Parts Co,LtdT E S T R E P O R T

Report number ZMTC/JC-2017-4-WG2-2(Z)

Page 1 of 6

Sample(s)AssemblyBolt,Nut,Washer Test Category Clients ' delegation

ModelM20120

Trademark/

Date of Manufacture/

GradeN/A

Name of Client HOBSON ENGINEERING CO PTY. LTD.Receiving Number of Sample(s) 6 PCS

Add of Client 10 Clay Place,Eastern Creek NSW Australia Properties Grade Bolt Grade 8.8Nut Grade 8

Manufacturer/ Receiving Date of Sample(s) 17Mar2017

Description of Sample

Sales Docket Item Code

Line Desc

2050380 KBHSTGCM200120

AS1252-1983 HDG B/N/W:M20120Trace #G1604168002Test to 2K0 Test Type KLot Number 00059014Shipment #010822Test Summary

The test according to the standard AS/NZS 1252.1:2006 ,AS/NZS

1252.2:2016, ISO 898-1-2013 , ISO 898-2-2012 ,EN 14399-2-2015 and

contract (No: ZMTC/JC-2017-4-WG2-2(Z)) , the test items conform to the

requirements

Date of Approval 24Mar2017

Remarks

/Approved by Audit by

Test by

Customer: Hobson FACTORY:Product: K0 AS1252:2016 HDG BNW:M24x110Class: 8.8Size: M24 x 110 KBHK0GCM240110Marking: 27Apr17

H Assembly Trace No.:10 pcs

Specifications: Set: AS1252- 2016 K-class=K0Bolt: AS1252- 2016Nut: AS1252- 2016 2. Mechanical Prooerties

Washer: AS1252- 2016 2.1 BoltLot No. :

n = 51.Chemical Composition (%)

C Si Mn P S Cr Mo Ni B Cu n = 5100 100 100 1000 1000 100 100 100 10000 100 Min HRC N/m N/m kN

Min 15-25 Max HRC N/m N/m kN Max 40-55 60.00 3 3 3.0000 Min 23 660 830 203

Heat No. 21 22 77 18 2 77 1 19 1 Max 24Min 0.25 Min 28 870 934 335,125Max 58 0.060 0.150 Max 30 889 975 335,877

Heat No. 46 19 72 8 5 Avg 29 878 952 335,445MinMax

Heat No. 44 19 76 11 2 2 1 1 AS4291.1

2.2 Nut 4. Assembly Test Visual & Thread InspectionLot No. :

Min MinMax MaxMin MinMax MaxAvg Avg

63594

2015352400

23366

2015352300

1006596900 1006592400

353 39

Spec. 24 285.4 Spec. 33

AS1815.129 353 38.5

Results28 353

Results38

30

36

2.3 Washer

Division Hardness Proof Load Division Hardness

n =5 n = 5 n =5

N40093 Spec. of Test Method AS4291.1

Wedge Angel

Results Nut Rotation Min

Spec Nut Rotation Min Thread

OkUnit HRC kN Unit RC

Ok

Nut Spec.

ResultsHI06034

Washer Spec.

151615

Wedge Tensile LoadSurface Core Yield Strength

Tensile Strength

Bolt Spec.Spec.HI05999

Division

12 52

Unit

12.5

% % kN mm

% kN

Division

Hardness

Elongation Reduction of Area

Specimen Tensilen = 5

Proof Loadn = 5

Elongation

INSPECTION CERTIFICATE

Bolt:Nut:Washer:

Part No.:

Suface Condition:

Q'ty Shipped:

Certificate No.:

Date Shipped:HEC, 8.8, JJ88 HDG

INV23366 Hobson Engineering approved Factory No.02

J420170123053

27-Apr-17

Ok

Ok

AS4291.1

270

575858

This is to certife that the above results are true and correct in every details

Spec. of Test Method AS4291.2 AS4291.2

WasherSpecification of Test Method AS1252-201641

3d

3d 7d

7d 11d

210

240 Ok

-

Appearance

Quality Control Manager

Invoice No.:S/C No.:P/O No.:

Production Date:

34

3.4

AS4291.1

Spec. of Test Method

Clamped length

Load

147

212,000212,000212,000

%

Lot No. :

Division

Bolt

Nut

K0 Quality Assurance Documentation Online

Page 1 of 1

H o b s o n E n g i n e e r i n g Q u a l i t y S y s t e m : I S O 9 0 0 1 Quality Matters

SDoc Compliance Statement

Hobson Engineering Co Pty Ltd (ABN 38 000 289 958)

10 Clay Place

EASTERN CREEK NSW

2766 AUSTRALIAOperates with an ISO 9001 quality management system

o Hobson Engineering Co Pty Ltd (ABN 38 000 289 958) has reviewed

the Initial Type testing (ITT) reports of the factory that

produced the product.


the Factory Production Control testing (FPC) reports for the

items on this verification report of the factory that produced

the product.

o Hobson Engineering Co Pty Ltd (ABN 38 000 289 958) and the

factory that produced these products have systems satisfying ISO

9001 and procedures are in place to maintain product integrity,

including testing procedures and nonconforming product.


the packaging and traceability requirements.


the MANDATORY attached Verification testing reports (VTR).

o Hobson Engineering Co Pty Ltd (ABN 38 000 289 958) confirms

compliance of this product to AS1252:2016 Part 1 and Part 2

(Mandatory).

Signed as the authorised competent person at Hobson Engineering Co Pty Ltd

Peter Hobson B.Eng (UNSW)

Quality Assurance Manager

CEO

S Suppliers Declaration of Conformity (SDoC)

F Factory Production Control (FPC)

TEST REPORT

Report number ZMTC/JC-2017-4-WG2-2(Z)

Sample name AssemblyBolt,Nut,Washer

C u s t o m e r HOBSON ENGINEERING CO PTY. LTD.

Ningbo Zhongji Inspection of Machinery Parts Co,Ltd

Initial Type Testing (ITT)

161120341352

Product

HOBSONNEWS


K0

AS 1252: 2016 K0 8.8 HR replaces AS 1252: 1983 dimensional (1996 mechanical)

Fully adhering to the new standard.

Unique Batch head marking. See photo below

Verification Testing Reports included in the Supplier Declaration of Conformance [SDoC].

Full Quality Assurance documentation online.

AS 1252: 2016 K0 8.8 HR Structural Assembly

Suppliers mark Unique Heat Code

Property Class as per ISO 898-1

K0 88 HR STRUCTURAL ASSEMBLY HOT DIP GALVANISED / AS1252:2016 K0 / CLASS 88

Part Size Length(mm)

KBHK0GCM120 M12 30-200KBHK0GCM160 M16 40-700KBHK0GCM200 M20 40-800KBHK0GCM220 M22 55-200KBHK0GCM240 M24 50-750KBHK0GCM270 M27 80-200KBHK0GCM300 M30 75-725KBHK0GCM330 M33 130-230KBHK0GCM360 M36 90-600

M20 x 5050 pcs

HOT DIP GALVANISED K0 STRUCTURAL ASSEMBLY AS1252:2016 K0 / CLASS 88

HEAT: JJT-E987654 LOT: A123456 PO: 99999 NS1 CTN WGT: 16.00kg

SDoC: This product complies to AS1252:2016 Part 1 and 2 (mandatory). ALL conforming documentation and quantity production units are available online at hobson.com.au/k0 or scan the below QR code.

9 350629 060574

KBHK0GCM200050

Q:K02050

Product

www.hobson.com.au

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Hobson Goes GreenHOBSON ENGINEERING, EASTERN CREEK NSW

NEW Solar panels were recently added to Hobsons Sydney Branch.

Product

Did You Knowabout our...

EZ Drill Bit Kits*Full details online

On Location

K0

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Product

Examples:

When clicked, the link will show you how this product is packaged:

When clicked, the link will show you detailed information about the product:

This link is for a TradePAX Product.This link is for a Mungo Product.

When you see a Chainlink click it for more information on that product.

Using in the portal

FEATURES: Full product range

Barcoded Re-sealable Strong durable plastic Window for product viewing

Eyelet for hanging on hooks Cone shaped base for standing

Retail packaging specially picked and packed for your business needs

1708

28FL

Full range of quality fasteners online www.hobson.com.au

QUALITY FASTENERS SINCE 1935Product and Service Reliability | Traceability | Accredited | Australian Family Owned

This product comes packaged in a handy

bag.

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1 PRE (Pitting Resistance Equivalent) number shows the pitting corrosion resistance of stainless steels. A higher PRE number indicates better corrosion resistance. The PRE is defined as, in weight-%: PRE = % Cr + 3.3 x % Mo + 16 x % N

2 Standard offer for Bumax Lean Duplex is 1.4162 (PRE 26), but we have also the possibility to supply 1.4661 (PRE 33)

Bumax is Bufabs registered trademark, known as the strongest stainless steel fastener in the world. Bumax is manufactured in Bufabs own plants in Sweden and meets the requirements of high demanding customers when it comes to quality, corrosion resistance, high strength, fatigue strength, traceability and heat resistance. We deliver

safety and reliability. Some of the products in the Bumax-family are completely unique that cannot be found anywhere else on the market. All products have full traceability (3.1 certificates available for each item) and are sourced solely from premium European stainless steel manufacturers according to rigid specifications.

BUMAX GRADESBUMAX 88 offers better corrosion resistance than standard A4 due to higher molybdenum content. Bumax 88 is a very consistent material that offers higher yield strength and lower amount of inclusion than standard A4 fasteners, that gives superior mechanical properties and fatigue resistance. Bumax 88 fasteners are used in many applications that demands very low magnetic permeability, it has lower magnetic permeability and less variation from batch to batch compared to standard A4 fasteners.

BUMAX 109 is the strongest A4 bolt on the market. Same material as Bumax 88 but higher strength due to special manufacturing process.

BUMAX Nitro, austenitic stainless steel with high nitrogen content, characterized by very high strength and fatigue resistance, in combination with good corrosion resistance. Excellent material for marine application and can be supplied in strength class 12.9 up to M42.

BUMAX Super Austenite (SA), high-alloy austenitic stainless steel for seawater and other aggressive chloride bearing medias. Excellent resistance to general, crevice, pitting and stress corrosion.

BUMAX Lean Duplex (LDX) offers economical solution for high strength fasteners in medium corrosive environments.

BUMAX Duplex (DX) are characterized by excellent strength, ductility and fatigue resistance in combination with good general, pitting, crevice and stress corrosion properties.

BUMAX Super Duplex (SDX) are characterized by excellent mechanical properties and very good corrosion resistance. Excellent resistance to general crevice, pitting and stress corrosion in chloride bearing medias.

BUMAX Hyper Duplex (HDX), a groundbreaking alloy used in the most demanding applications. Suited for use in severe corrosive environments such as hot chlorinated sea-water and for aggressive acidic chloride containing media in chemical, oil/gas, marine and petrochemical industry.

BUMAX Ultra, a unique precipitation hardenable stainless steel that can be delivered in ultra high strength levels. Strongest stainless steel fastener on the market. Good corrosion resistance in chloride environments.

BUMAX Heat (HE), high temperature resistant material for applications requiring high strength and good oxidation resistance at temperatures up to 700C. Can be precipitation hardened.

BUMAX Heat Plus (HEP), precipitation hardenable high tempe-rature resistant material with excellent oxidation resistance and high tensile and creep properties at temperatures up to 815C.

Other special grades can be offered on request

GRADE EN UNS Microstructure C max Cr Ni Mo Other PRE1)

BUMAX 88 1.4432, 1.4436, 1.4435 S31603 Austenitic 0.03 17 11.5 2.7 27


BUMAX Nitro S31675 Austenitic 0.035 20.5 10 2.4 N 0.4 35

BUMAX SA 1.4547 S31254 Austenitic 0.01 20 18 6.2 N, Cu 43

BUMAX LDX2) 1.4162 S32101 Ferrite-Austenitic 21.5 1.5 0.3 N 0.22, Mn 5 26

BUMAX DX 1.4462 S31803, S32205 Ferrite-Austenitic 0.03 22 5.2 3.2 N 0.18 36

BUMAX SDX 1.4410 S32750 Ferrite-Austenitic 0.03 25 7 4 N 0.3 42

BUMAX HDX 1.4658 S32707 Ferrite-Austenitic 0.03 27 6.5 4.8 N 0.4, Co 49

BUMAX Ultra S46910 Martensitic 0.02 12 9 4 Al, Ti, Cu 25

BUMAX HE 1.4980 S66286 Austenitic 0.08 15 26 1.5 Ti, V

BUMAX HEP 2.4952 N07080 Austenitic 0.10 19 >65 - Al, Ti, Co

CHEMICAL COMPOSITION Nominal wt%

BUMAX A BUFAB GROUP BRAND





























































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PROPERTIES AT LOW AND HIGH TEMPERATURES

BUMAX FASTENERS

in as delivered condition

Grade DimensionStrengthClass Screws and stud bolts Nuts Washers

Tensile strength Rm, min

Yield strength Rp0.2, min

Elongation, min Stress under proof load, min

Hardness, min

mm MPa ksi MPa ksi mm MPa HV

BUMAX 88 M3 - M36 88 800 116 640 92 0.3 d 800 200

BUMAX 88, PED M6 - M30 88 800 116 640 92 0.4 d 800 200

BUMAX 109M3 - M12 > M12

109109

10001000

145145

900800

130116

0.2 d 1000 300

BUMAX Nitro M42 109129

10001200

145174

9001080

130156

0.2 d 2) 2)

BUMAX SA M42 88109

8001000

116145

640800

92116

0.2 d 2) 2)

BUMAX LDX M4288109129

80010001200

116145174

6409001080

92130156

0.3 d 2) 2)

BUMAX DX M4288109129

80010001200

116145174

6409001080

92130156

0.3 d 2) 2)

BUMAX SDX M4288109129

80010001200

116145174

6409001080

92130156

0.3 d 2) 2)

BUMAX HDX M888109129

80010001200

116145174

6409001080

92130156

0.3 d 2) 2)

BUMAX Ultra1) M16149159169

140015001600

203217232

126013501440

182195208

0.2 d 2) 2)

MECHANICAL PROPERTIES

1 Bumax Ultra is a grade that is tailor made to solve customer needs in regards of strength, ductility, fatigue and wear resistance. Values in the table are typical strength values, but even higher strength levels can be achieved on some designs and dimension, up to tensile strength levels of 2500 MPa.

The data shown in the table are typical and are representative for the majority of standard fasteners. May be subject to alterations, depending on size and design.

2 On request

It is important to understand what happens with the fastener material when operating at elevated temperatures for prolonged times. Properties such as thermal expansion, strength, ductility, corrosion resistance and fatigue resistance are affected by high temperatures and its effect on the jointed application must be considered from case to case. The diagram to the right shows typical yield strength losses that instantly occur in the material when exposed to high temperatures. Property changes during prolonged service at elevated temperature must also be considered. Gas corrosion at high temperature is totally different compared to wet corrosion at lower temperatures. Furthermore, changes in mechanical properties might gradually change over time due to ageing and creep deformation. Ageing that occurs in all stainless steel material over time is enhanced by high stresses in the material in combination with high temperature or temperature fluctuations, and can lead to ductility losses in the material. Creep deformation is a slow plastic deformation under the influence of mechanical stresses. It can occur as a result of long-term exposure to stresses that are still under the yield strength of the material and the effect increases at higher temperatures.Bumax HE and Bumax HEP are high temperature resistant grades optimized for high temperature conditions and are much more stable against ageing, gas oxidation, creeping and strength losses compared to regular stainless steels.

An increased brittleness at subzero and especially cryogenic temperatures is characteristic of all steels and metals in general. Some steel grades become more brittle than others at cryogenic temperatures below -150C. This depends mainly on microstructure, chemical composition and internal stress. Austenitc stainless steels has generally better impact strength at very low temperatures than Duplex, Ferritic and Martensitic stainless steel.

To understand the environment and application requirements is therefore crucial. Your local Bumax sales representative will help you selecting the right material.

Temperature (C)

Temperature (C)

Yield strength Rp0.2 (MPa)

Yield strength Rp0.2 (MPa)

20400

500

450

600

650

550

700

100 200 300 400 500 600

Bumax Heat Plus

Bumax Heat

Fig 1. Typical yield strength losses at elevated temperature for stainless steel

Fig 2. Typical yield strength losses at elevated for heat resistant grades

20400

500

600

700

800

900

1000

1100

1200

1300

1400

100 200 300 400 500 600

Bumax Ultra

Bumax 109

Bumax LDX, DX, SDX, HDX

Bumax 88

www.hobson.com.au

HOBSONNEWS


Grade Thermal expansion, mean values in temperature ranges (x10-6) per CMagnetic permeability

20 to 100C 20 to 200C 20 to 300C 20 to 400C 20 to 500C 20 to 600C

BUMAX 88 16.5 17 17.5 17.5 18 18 1.006

BUMAX 109 16.5 17 17.5 17.5 18 18 1.007

BUMAX Nitro 15 15.5 16 16.5 17 17 1.003

BUMAX SA 16 16 16.5 16.5 17 17 1.003

BUMAX LDX 12.5 13 13.5 13.5 14 14.5 100

BUMAX DX 12.5 13 13.5 13.5 14 14.5 100

BUMAX SDX 12.5 13 13.5 13.5 14 14.5 100

BUMAX HDX 12.5 13 13.5 13.5 14 14.5 100

BUMAX Ultra 11.5 12 12 12.5 12.5 13 1000

BUMAX HE 16.5 16.5 17 17 17.5 17.5 1.007

BUMAX HEP 12 13 13 13.5 13.5 14 1.001

CORROSION RESISTANCE

PHYSICAL PROPERTIES

BUMAX FASTENERS

No corrosion under normal conditions Not suitable, corrosion is likely to occur Possible risk of corrosion, but the steel grade might be suitable depending on requirement, environment, design and maintenance.

Grade Urban Marine, salt water Hydrochloric acid (HCl) at 50C Sulphuric acid (H2SO4) at 50C

High Low High 0.1% 1% 2% 3% 1% 10% 30%

BUMAX 88, 109

BUMAX Nitro

BUMAX SA

BUMAX LDX

BUMAX DX

BUMAX SDX

BUMAX HDX

BUMAX Ultra

Low: Mild condition, such as low concentrations at low temperatures. High: Severe condition, such as high concentrations at elevated temperatures.

PRELOAD AND TIGHTENING TORQUEPreload is needed to keep the jointed part together and function correctly for long periods of time, resisting both static and dynamic loads.The combined stresses in the joint should normally not exceed the yield strength of the fastener. In practical use the recommended pretension vary between 50-80% of the yield strength Rp0.2. Tightening torque is needed to achieve the necessary preload. The recommended tightening torque depends on many parameters such as friction, fastener strength, thread diameter, screw type and tightening procedure. The recommendation use for Bumax products are based on a targeted preload of about 65-70% of the yield load and a friction coefficient of 0.14-0.16, which can only be obtained by a burr-free surface using high quality lubrication. Recommended preload and tightening torque data can be found at www.bumax.se.

at 20C, unless stated otherwise

HOBSONNEWS

www.hobson.com.auNYLOC DRiLLX TDX Conxtruct XBolt ClawBolt TygaBolt SampsonRod 1 0

Taptite trilobular geometry

K


Phone: +46 (0)585-521 00 | Fax: +46 (0)585-521 15 | www.bumax.se | [email protected]

BUMAX HARD SELF- TAPPING SHEET METAL SCREW (ST) Bumax Hard self-tapping screw with ST thread is designed for use in structural steel and cold rolled stainless steel with a maxi-mum hardness of approximately 200 HV.

All Bumax Hard products exhibits excellent surface hardness and are made with the same steel grade as Bumax 88. Bumax Hard is a great and cost-effi cient solution for fi tting to sheet metal and profi les.

Stainless steel fasteners have properties which make them attractive choices for a wide range of applications. It is essential to consider the required properties such as corrosion resistance, temperature resistance, mechanical strength and magnetic permeability. Correctly chosen material will guarantee a trouble-free life time and low life cycle cost.Grade selection cross helps you select the best material suited for your needs.

BUMAX FASTENERS

BUMAX LOCKBumax Lock is an all-metal lock nut made out of the same steel grade as Bumax 88. It is equipped with a specially designed thread profi le that locks when it is tightened, distributing the stresses along the entire nut thread. This allows better load distribution which in turn produces greater gripping strength.

Disclaimer: The information contained in this data sheet is for guidance only and summarizes Bufab best knowledge and considered accurate as of the version date. Since the use of Bumax products is not within the control of Bufab it is the users obligation to determine the suitability of the product for its intended application and assumes all risk and liability for its safe use

BUMAX GRADE SELECTION CROSS

BUMAX SABUMAX SDX

BUMAX HEP

BUMAX Nitro

BUMAX Ultra

BUMAXUltra

BUMAX HE BUMAX HEP

BUMAX HDX

CORROSION RESISTANCE

MECHANICAL STRENGTH

TEMPERATURERESISTANCE

LOW MAGNETICPERMEABILITY

BUMAX NitroBUMAX DX

BUMAX LDXBUMAX DXBUMAX SDXBUMAX HDX

BUMAX 88 BUMAX 109

BUMAX 88 BUMAX 109

BUMAX SA BUMAX Nitro

BUMAX 88

BUMAX 109

A4 BUMAX HE BUMAX HEP

TEMPERATURETEMPERATURERESISTANCERESISTANCE

BUMAX HEP

LOW MAGNETICLOW MAGNETICPERMEABILITYPERMEABILITY

BUMAX SA BUMAX Nitro

BUMAXUltra

BUMAX HEBUMAX HEBUMAX 88 BUMAX 109

BUMAX SA BUMAX NitroBUMAX SA BUMAX Nitro

BUMAX Ultra MECHANICAL STRENGTH

BUMAX HDXRESISTANCE

BUMAX SDXBUMAX HDX

BUMAX Nitro

BUMAX SDXBUMAX SABUMAX SDX

BUMAX LDXBUMAX DXBUMAX DXBUMAX SDX

BUMAX DX

BUMAX 88 BUMAX 109

BUMAX NitroBUMAX DX

BUMAX 88

BUMAX 109

Time

Bumax Lock

Normal nut

Tensile stress

C=External circle diameter D=Trilobular diameter E=Internal circle diameter K=Ovality

Fig 3. Residual stress

Thread shape and entry thread

-7

D E C

BUMAX HARD TAPTITE THREAD-FORMING SCREWBumax Hard Taptite is a thread-forming screw which forms its own thread during assembly because of its trilobular shape, its conical entry thread and its excellent surface hardness. Bumax Hard Taptite is suitable for assembly in structural steel and cold rolled stainless steel with hardness up to 200 HV.

v. 1.1 / Prin

ted 20

14/03

For more information contact your local Bumax salesman or visit www.bumax.se.

www.hobson.com.au

HOBSONNEWS


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