Duplex fasteners

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Duplex fasteners
What is Duplex fasteners ?

Duplex stainless steel has high chromium and moderate nickel content in its alloy. The duplex fasteners have high tensile strength with increased hardness and toughness. The material is less likely to get deformed as well. The WNR 1.4462 dowel pin has mixed yet balanced austenite and ferritic structures, which contributes to its good mechanical properties. The alloy 2205 washer can show its optimal performance, even with low weight and leads to cost saving.

The UNS S31803 threaded rod shows good resistance to chloride ion related stress corrosion cracking. Duplex 2205 is one of the most widely used grades that show better corrosion resistance than the standard austenitic stainless steel. The ASTM A1082 UNS S32205 studs can also withstand pitting, crevice and stress corrosion cracking. However, they are difficult to machine and form.

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India's first ever manufacturer of duplex 2205 fasteners as per ASTM A1082, know can duplex screws be used in harsh environments ?

Can duplex screws be used in harsh environments?

The duplex screws have high strength and corrosion resistance, which makes them perfect for harsh environments. It can be used in highly acidic, alkaline, elevated temperature and chemical environments.

We are most reliable supplier of duplex bolts and nuts in Mumbai use for seawater equipment, check distinction between 316 and duplex 2205 bolts

Duplex screws

Duplex screws

Duplex 2205 fasteners

Duplex 2205 fasteners

Duplex bolts

Duplex bolts

What is the distinction between 316 and duplex 2205 fasteners?
  • The duplex 2205 fasteners have higher chromium but lower nickel content than 316 ss. It also has dual ferritic and austenitic microstructure along with added nitrogen in the alloy unlike grade 316.
  • Duplex 2205 has better corrosion resistance properties.
  • 2205 grip fast duplex screws have higher mechanical strength & toughness and they can withstand higher loads than 316 stainless steel.
  • The 2205 duplex screws are more expensive than the standard 316 ss grade.

We are most affordable stockist of duplex steel fasteners, we have ready stock of UNS S32205 studs and threaded rod ranging from #00 – 4” inch diameter. Order online to save money.

Duplex fasteners specification
Duplex fasteners specification

 

Hot Forged CNC machined Length
upto M39/ 1-1/2" upto M100/ 4" Dia upto 1100 to 3500 mm
Specification Grades Thread
ASTM A1082 | ASME SA1082 Duplex 2205 (UNS S32205/ S31803) BSW, METRIC, UNF, UNC, BSF, custom
We provide UNS S31803 hex bolts and socket head cap screw that is in any size in accordance with the needs of the client, explore duplex stainless steel bolts more available types
Most selling types of duplex 2205 fasteners
UNS S32205 Studs

UNS S32205 Studs

  • ASTM A1082 | ASME SA1082
  • M3 - M56
  • Length: 3 - 200 mm
Alloy 2205 nuts

Alloy 2205 nuts

  • UNF, UNR
  • UNC
  • UNJ, Rolled or Cut
UNS S31803 Threaded Rod

UNS S31803 Threaded Rod

  • Teflon Coated
  • Cadmium Coated
  • Zinc Coated
Are odd sizes of WNR 1.4462 dowel pin and washer hard to find? Don't worry, we are duplex fasteners manufacturer, you can now order online at factory prices, see properties
Duplex bolts equivalent
STANDARD UNS WNR
Duplex UNS S31803 / UNS S32205 1.4462 / 1.4462
Duplex screws mechanical properties
Material Hardness (HB) MAX Yield Strength 0.2% ksi (min) Elongation % Tensile Strength ksi (min)
Duplex 217 65 25 90
Duplex steel fasteners chemical properties
Mn N C S Si P Cr Mo Ni
2205 (S32205) 2.0 max min: 0.14
max: 0.20
0.03 max 0.02 max 1.0
max
0.03 max min: 22.0 max: 23.0 min: 3.0
max: 3.5
min: 4.5 max: 6.5
2205
(S31803)
2.0
max
min: 0.08
max: 0.20
0.03
max
0.02
max
1.0
max
0.03
max
min: 21.0
max: 23.0
min: 2.5
max: 3.5
min: 4.5
max: 6.5
How do Duplex and Super Duplex fasteners differ?
  • Super duplex is an upgraded version of duplex steel fasteners and hence they have higher chromium, nickel and molybdenum content.
  • Super duplex offers better corrosion resistance due to the higher alloy content.
  • The super duplex material offers higher mechanical strength than duplex stainless steel bolts.
  • The duplex fasteners are more affordable than the super duplex ones.
What is the best way to store duplex bolts?
  • The duplex fasteners manufacturer recommends the following for proper bolt storage:
  • They should be stored in a clean, dry and well-ventilated environment, away from contamination.
  • They should be protected from weather elements including moisture from grounds.
  • The duplex bolts must not come in direct contact with other materials, or galvanic erosion might occur.
  • The packaging should be non-abrasive and they must not be stacked.
  • The bolts should be regularly inspected to check for any signs of damage, contamination or corrosion.
What factors should be considered when choosing duplex steel fasteners?
  • Determine the particular conditions of the application, including corrosion to determine if duplex steel fasteners are suitable for it.
  • The applied load of the service should be compatible with the fasteners.
  • Determine the temperature range of the application and see if it fits with the fasteners.
Torque chart of duplex fasteners
Flange
Size
B16.5 Class 150 FF/ Full Face Gaskets B16.5 Class 150 RF/ Ring Gaskets
Torque / Round (ft-lbs) Stud Bolts Tighten Sequence Torque / Round (ft-lbs) Stud Bolts Tighten Sequence
2nd 1st Final Bolt Size Dwg*/No. 2nd 1st Final Bolt Size Dwg/No.
1/2 40 20 60 1/2 4-bolt 20 10 30 1/2 4-bolt
3/4 40 20 60 1/2 4-bolt 27 13 40 1/2 4-bolt
1 40 20 60 1/2 4-bolt 30 15 50 1/2 4-bolt
1-1/4 40 20 60 1/2 4-bolt 40 20 60 1/2 4-bolt
1-1/2 40 20 60 1/2 4-bolt 40 20 60 1/2 4-bolt
2 80 40 120 5/8 4-bolt 80 40 120 5/8 4-bolt
2-1/2 80 40 120 5/8 4-bolt 80 40 120 5/8 4-bolt
3 80 40 120 5/8 4-bolt 80 40 120 5/8 4-bolt
3-1/2 80 40 120 5/8 8-bolt 80 40 120 5/8 8-bolt
4 80 40 120 5/8 8-bolt 80 40 120 5/8 8-bolt
5 120 60 200 3/4 8-bolt 120 60 200 3/4 8-bolt
6 120 60 200 3/4 8-bolt 120 60 200 3/4 8-bolt
8 120 60 200 3/4 8-bolt 120 60 200 3/4 8-bolt
10 190 95 320 7/8 12-bolt 190 95 320 7/8 12-bolt
12 190 95 320 7/8 12-bolt 190 95 320 7/8 12-bolt
14 294 147 490 1 12-bolt 294 147 490 1 12-bolt
16 294 147 490 1 16-bolt 294 147 490 1 16-bolt
18 426 213 710 1-1/8 16-bolt 426 213 710 1-1/8 16-bolt
20 426 213 710 1-1/8 20-bolt 426 213 710 1-1/8 20-bolt
24 600 300 1,000 1-1/4 20-bolt 600 300 1,000 1-1/4 20-bolt
Weight chart of duplex 2205 bolts
APPROXIMATE WEIGHT IN KGS
LENGTH D I A M E T E R
M 10 M 6 M 5 M 8 M 20 M 16 M 14 M 18 M 22
16 mm 3.211 0.743 0.448 1.590
25 mm 3.660 0.897 0.660 1.871 8.170
20 mm 3.411 0.812 0.598 1.711
35 mm 4.223 1.120 0.804 2.271 19.608 11.416 10.000 16.026
30 mm 3.912 1.010 0.737 2.070 18.657 10.707 9.690
45 mm 4.840 1.340 0.958 2.671 21.739 12.821 10.504 17.241
40 mm 4.533 1.230 0.881 2.470 20.747 12.107 10.288 16.667
50 mm 5.155 1.450 1.030 2.870 22.727 13.624 11.261 17.857 28.409
60 mm 5.774 1.670 3.270 25.126 15.244 12.255 20.000 32.051
55 mm 5.464 1.560 3.071 23.810 14.409 11.628 18.868 30.120
65 mm 6.083 1.781 3.472 26.455 16.026 12.626 21.008 34.014
75 mm 6.702 2.000 3.873 29.070 17.606 13.228 23.256 39.063
70 mm 6.394 1.890 3.671 27.778 16.835 12.987 22.124 35.461
80 mm 7.013 2.111 4.072 30.303 18.248 13.889 24.510 40.000
100 mm 8.251 4.873 35.714 21.459 16.340 27.778 46.296
90 mm 7.634 4.472 33.113 19.841 14.925 26.042 41.667
110 mm 8.881 38.168 23.041 17.730 31.250 47.170
130 mm 10.101 43.478 26.316 20.000 34.722 52.632
120 mm 9.506 40.984 24.631 18.797 32.895 50.000
140 mm 10.707 46.296 27.933 20.833 35.461 55.556
160 mm 11.905 50.505 31.056 24.272 40.984 61.728
150 mm 11.312 48.544 29.412 22.222 37.594 58.824
180 mm 13.123 55.556 34.247 26.882 67.568
170 mm 12.500 53.191 32.680 64.935
190 mm 13.736 58.140 35.971 70.423
220 mm 15.528 65.789 40.650 79.365
200 mm 14.327 60.976 37.594 29.586 49.020 73.529
240 mm 16.722 71.429 43.860 84.746
260 mm 17.921 76.923 47.170 90.909
250 mm 17.301 74.627 45.455 87.719
280 mm 19.157 81.967 50.505 98.039
320 mm 92.593 56.818
300 mm 20.325 87.719 53.763 104.167
360 mm 104.167 63.291
340 mm 98.039 60.241
380 mm 108.696 66.667
400 mm 113.636 69.444
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