Duplex Fasteners

Duplex Fasteners

Austenitic-ferritic stainless steels are alloys that contain both austenite and ferrite in an almost equivalent proportion. Hence, they are known as duplex grades. Duplex Fasteners are preferred in highly demanding applications because they have higher mechanical strength along with excellent to good corrosion resistance properties.

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Duplex steel hex bolts and square bolt suppliers in UAE

Duplex fasteners specification


Duplex Fasteners Specifications

Duplex stainless hex bolt sizes Duplex stainless steel washer size chart Duplex steel hex bolts other fasteners
  • Imperial Duplex SS bolt:  1/4″ to 4″
  • Metric ASTM A276 duplex steel bolt: M1.2 – M48
  • Length: 12 – 1200mm (1/2″ – 4.0″)

Most common sizes

  • M8 SA 276 duplex hex bolt
  • M10 SA 182 duplex hex bolt
  • M12 duplex steel hex bolt
  • 1/4″ to 3″
  • M3 – M36
 

 

Duplex steel fasteners grades American standard of Duplex bolts Duplex steel nut bolts temperature range
  • ASTM A276
  • ASTM A479
  • ASTM A182
  •  -50 °C to 300 °C
Duplex bolt
thread class
SA 276 duplex hex bolt head types Duplex steel bolts manufacturing method
  • Class 1A (Loose fit)
  • Class 2A (Medium fit)
  • Class 3A (Tight fit)
  • 5 CSF
  • 5 ONF
  • 5 HF
  • 2G
  • 3G
  • 4G
  • 6G
  • 8G
  • custom

Contact above duplex fasteners manufacturers & suppliers to see thread diameter

  • Flat
  • Oval
  • Pan
  • Truss
  • Hex head
  • Hex washer head
  • Slotted hex washer
  • Socket cap head
  • Button head
  • Phillips Drive
  • Frearson Drive
  • Slotted Drive
  • Combination Drive
  • Hex / Socket / Allen Drive
  • Cold Forged
  • Hot Forged
  • CNC machined

Have custom requirements? Contact above listed duplex fasteners suppliers & manufacturers in UAE

Duplex steel square bolts required testing & certificates Duplex steel countersunk bolts thread types Duplex steel plain washer end
  • EN 10204 / 3.1, 3.2
  • Tensile test
  • Charpy V-notch test
  • Rockwell / Brinell Hardness test
  • Microstructure Analysis
  • Impact testing
  • Coarse thread (UNC)
  • Fine Thread (UNF)
  • 8-Thread Series (8UN)
  • BSF
  • UNEF
  • UNJ
  • 12-thread series (12-UN)
  • Metric coarse
  • Metric fine
  • ACME
  • Trapezoidal
  • Sheared end
  • Chamfer end
  • Semi-cone point
  • Half point
  • Cone point
  • Gimlet point
  • Chisel point
  • 45 degree angle cut
  • Milled end

 

 

Duplex steel spring washer meet standards Duplex steel machined washer applications Duplex steel eye bolts surface treatments
  • ASME B16.5
  • ASME B1.1
  • ASME B1.5
  • DIN 931
  • DIN 933
  • ISO 4014
  • ISO 4017
  • ASTM A722
  • ASTM A1082
  • DAST 021
  • JIS – Japan
  • ANSI – USA
  • ANSI B 18.2.4 2M
  • ANSI B 28.2.4 1M
  • GB T5783 /T5782 / 5783
  • ISO
  • SAE -America
  • DIN – Germany
  • UNI – Italy
  • Polish PN
  • EU – Europe
  • CSN – Spain
  • ASME – USA
  • IS – Indian
  • BS – British
  • Flange joints
  • Petrochemical plants
  • Rigs
  • Bridge construction
  • Offshore
  • Automotive industry
  • Aerospace
  • Wind mills
  • Solar plants
  • Ship building
  • Clear Zinc Plated
  • Cadmium
  • Zinc Nickel
  • Plain
  • Oil
  • Nickel Plated
  • Yellow Zinc Plated
  • Hot Dip Galvanized
  • Black Oxide
  • Green Finish
  • Black Finish
  • PTFE / Teflon
  • Mechanical

Buy duplex bolts at affordable prices from certified duplex steel fasteners manufacturers in Middle East countries

Types of duplex stainless steel fasteners

Duplex Hex Bolts

Duplex Hex Bolts

DSS J-bolts

DSS J-bolts

Duplex Alloy Countersunk Bolts

Duplex Alloy Countersunk Bolts

Duplex Stainless Steel U-bolts

Duplex Stainless Steel U-bolts

Duplex Alloy Friction Grip Bolts

Duplex Alloy Friction Grip Bolts

Duplex Stainless Steel Square Bolts

Duplex Stainless Steel Square Bolts

Duplex Eye Bolts

Duplex Eye Bolts

Duplex Steel Tie Bolts

Duplex Steel Tie Bolts

DSS T Bolts

DSS T Bolts

Duplex Spring Washer

Duplex Spring Washer

Duplex Steel Star Washer

Duplex Steel Star Washer

DSS Machined Washer

DSS Machined Washer

Duplex Stainless Steel Heavy Hex Head Bolt

Duplex Stainless Steel Heavy Hex Head Bolt

Duplex Alloy Heavy Hex Bolt

Duplex Alloy Heavy Hex Bolt

Duplex Stainless Plain Washer

Duplex Stainless Plain Washer

Also find ex-stock of duplex steel nut bolts with verified manufacturers, stockist & suppliers in Qatar, Saudi Arabia (KSA), Oman, Kuwait & middle east

Most common ASTM A276 duplex steel nut bolt Special duplex SS bolting material
  • Duplex stainless steel j bolt
  • Duplex steel lag bolt
  • Duplex stainless hex bolts
  • Stainless steel duplex square bolts
  • Duplex eye bolts
  • DSS flange bolts
  • Duplex SS heavy hex bolt
  • ASTM A276 duplex steel hex head bolt
  • SA 276 duplex shoulder bolt
  • ASTM A182 duplex plow bolt
  • SA 182 duplex carriage bolt
  • Stainless steel duplex socket bolt
  • Duplex stainless round head bolts
  • Duplex stainless steel mushroom head square neck bolts
  • duplex t-head bolt
  • ASTM A276 duplex steel 12 point bolt
  • Duplex SS t-head bolt
  • SA 276 duplex tap bolt
  • DSS machine bolt
  • Duplex step bolt
  • Duplex steel elevator bolt
  • SA 182 duplex stove bolt
  • ASTM A182 duplex hanger bolt
  • DSS draw bolt
  • Duplex stainless foundation bolt

Types of duplex steel washers

Duplex stainless steel plain washer Duplex steel ogee washer
Stainless steel duplex spring washer Duplex dock washer
Duplex SS round washer ASTM A276 duplex steel countersunk washer
ASTM A182 duplex flat washer SA 276 duplex customized washer
SA 182 duplex dome washer DSS hexagonal washer
Duplex stainless steel punched washer Stainless steel duplex dome tooth washer
Duplex stainless lock washer SA 182 duplex fender washer
DSS hex washers ASTM A182 duplex split washer
Duplex SS machined washer Duplex steel square washer
Duplex steel spherical washer ASTM A276 duplex steel tooth lock washer
Stainless steel duplex tab washer

Duplex steel bolts strength

Grade Yield Strength
0.2% Proof min
Tensile Strength
min
UNS S32205 448 MPa 621 MPa
UNS S31803 448 MPa 650 – 880 MPa

Equivalent material of Duplex SS fasteners

STANDARD WERKSTOFF NR. UNS
Duplex 2205 1.4462 S31803 / S32205

Chemical composition of Duplex hex bolts

Grade Mn max C max P max Si max S max Mo Cr N Ni
S31803 2.0 0.03 0.03 1.0 0.02 max 3.5 min 2.5 max 23.0

min 21.0

max 0.20

min 0.08

max 6.5

min 4.5

S32205 2.0 0.03 0.03 1.0 0.02 max 3.5 min 3.0 max 23.0

min 22.0

max 0.20

min 0.14

max 6.5

min 4.5

Mechanical properties of Duplex steel nut bolts

Grade Elongation
(% in 50mm)
Hardness
Rockwell C (HR C)
UNS S31803 25 293 max.
UNS S32205 25 293 max.

Duplex Fasteners Properties

Duplex bolt torque

Nominchal Diameter (inch) Torque ft-lb (Lubricated) Threads (inch) Torque ft-lb (Dry)
1/4″ 4.8 20 6.5
5.5 28 7.4
5/16″ 10 18 13.2
11 24 14.7
3/8″ 17.7 16 23.5
19.9 24 26.6
7/16″ 28.2 16 37.6
31.5 24 42
1/2″ 43.0 13 57.4
48.5 20 64.7
9/16″ 62.1 12 82.7
69.2 18 92.3
5/8″ 85.7 11 114.2
97 18 129.3
3/4″ 152 10 203
170 16 226
7/8″ 245 9 326
270 14 361
1″ 368 8 490
412 14 549
1-1/4″ 639 7 853
708 12 944
1-1/2″ 639 6 1484
1252 12 1669

Find duplex stainless steel fasteners in various types such as duplex j-bolts, carriage bolt, countersunk bolts, and t bolts check sizes, dimensions and price in Dubai

The torque of bolts is calculated using the following formula –
T = KDP
Where T = Torque
K = torque coefficient (dimensionless)
D = nominal diameter in inches
P = bolt clamp load in pounds

Bolts are threaded (shank) fasteners with a head (that may or may not be recessed). Generally, they tend to have higher corrosion resistance properties, due to the inclusion of nickel, chromium and molybdenum in their alloy.

They exhibit good mechanical properties at room temperature, even when the shank of the screws is thinner. Moreover, the minimum yield strength of DSS hex bolts is almost two times that of a conventional austenitic alloy. Fasteners made from duplex alloys have good resistance to stress corrosion cracking.

Wide range of polished & coated duplex steel friction grip bolts in the Middle East. Duplex steel u-bolts with plain / spring /star /machined washer

Like most metals, if exposed to stronger reagents (acid or base), these fasteners may get corroded. However, compared to most austenitic or ferritic stainless steel grades, duplex stainless steel alloys have a considerably higher PREN (pitting resistance equivalent number) value. A higher PREN value indicates excellent resistance to pitting. Grade 2205 is a mid-range Duplex variety whose PREN value ranges between 28 – 38.

Find verified duplex stainless steel washer suppliers, compare response times and price of duplex eye bolts in United Arab Emirates

Duplex Carriage Bolt are ideal in structural applications. They aid in stabilizing structures temporarily or permanently in materials like wood, concrete or metal. They have a good performance and resist corrosion in moderately high-temperature environments.

Duplex Eye bolts vs DSS U bolt

DSS U bolts are threaded fasteners that are used with nuts to fit objects together. Unlike Eye bolts that have a loop at one end, hence they could be used with one (where one end is already attached to a material) or 2 nuts in an assembly.

The following is a list of duplex fasteners grades