• An ISO 9001:2015 Certified Company
  • Call

    +91 9930108105

  • Address

    Sanghvi Galaxy, Shop No.2, Khetwadi
    10th Lane, Mumbai-400004, India

Duplex fasteners manufacturer in India

Duplex Fasteners

What are duplex fasteners?

Applications demanding performance under duress prefer these components. Duplex fasteners have an austenite-ferrite microstructure that lends them wide temperature tolerance and corrosion resistance.

Customers can order different fasteners per their requirements, like duplex steel hex bolts, nuts, and washers.

Duplex bolts manufacturer in Mumbai

What are the key performance parameters listed in the duplex screws datasheet?

Datasheets for duplex countersunk bolts specify dimensions, hardness, thread pitch, nominal diameter, surface treatment, etc. These fasteners exhibit a high melting point (1350°C) and endure -50 to 300°C. Although Inconel and titanium provide better corrosion and fatigue resistance, duplex screws are more affordable.


Specifications of duplex fasteners


Duplex steel Hex nuts specification DSS heavy hex bolt length Duplex steel studs sizes
  • ANSI B18.2.2
  • DIN 934
  • ISO 4032
  • BS1768
  • BS 1769
  • 3 mm to 200 mm
  • M10 to M100
SA 182 duplex fasteners grades  Stainless steel duplex washer size chart SA 276 duplex hex bolt sizes
  • 1/4" to 3"
  • M3 - M36
  • Imperial :  1/4" to 4"
  • Metric : M1.2 – M48
  • Length: 12 - 1200mm (1/2" - 4.0")
ASTM A276 duplex steel bolts temperature range Hardness range of duplex SS fully threaded studs Duplex stainless steel eye bolt melting point
  • -50°C to 300°C
  • 293 HRC
  • 1350°C
Duplex socket head bolts density Duplex stainless bolts head drive ASTM A276 duplex steel heavy hex bolt thread types
  • 7.805 g/cm³
  • Slotted
  • Phillips/Slot
  • Phillips
  • Six-Lobe
  • ACME
  • Metric fine
  • UNJ
  • Trapezoidal
  • UNEF
  • Metric coarse
  • Fine Thread (UNF)
  • BSF
  • 8-Thread Series (8UN)
  • 12-thread series (12-UN)
  • Coarse thread (UNC)

Manifest alloys is duplex hex bolt supplier in India, to know more about our stock visit us

What are the lead times for procuring duplex stud bolt? How can these be optimized to reduce supply chain disruptions?

Procuring duplex stud bolts from vendors with short lead times and quick delivery helps application continuity. Around 5-10 business days is standard, but it may take 2-4 weeks for custom sizing and additional processing.

While manufacturers usually offer attractive prices, you may struggle to obtain customized sizes in smaller quantities. We advise developing business relationships with trusted suppliers with a repository of multi-sized DSS nuts.

We ship DSS bolts to Uruguay, Peru, Chile, and Brazil in 7-10 days.

Types of DSS fasteners


Duplex bolts

Duplex bolts

DSS nuts

DSS nuts

duplex SS washers

Duplex SS washers

Duplex stainless steel hex bolts

Duplex stainless steel hex bolts

DSS plain washer

DSS plain washer

Duplex steel stud bolt

Duplex steel stud bolt

SA 276 duplex Square bolts

SA 276 duplex Square bolts

Duplex stainless eye bolts

Duplex stainless eye bolts

Duplex dowel pin

Duplex dowel pin

ASTM A182 duplex threaded stud

ASTM A182 duplex threaded stud

Duplex stainless steel heavy hex bolt

Duplex stainless steel heavy hex bolt

SA 182 duplex Fully threaded studs

SA 182 duplex Fully threaded studs

Duplex steel flat washer

Duplex steel flat washer

Stainless steel duplex hex head bolt

Stainless steel duplex hex head bolt

DSS flange bolts

DSS flange bolts

ASTM A182 duplex j bolt

ASTM A182 duplex j bolt

Duplex stainless steel carriage bolt

Duplex stainless steel carriage bolt

DSS shoulder bolt

DSS shoulder bolt

SA 276 duplex rivets

SA 276 duplex rivets

Duplex threaded stud bolts

Duplex threaded stud bolts

Stainless steel duplex studs

Stainless steel duplex studs

SA 182 duplex round head bolts

SA 182 duplex round head bolts

Duplex SS Double end stud bolts

Duplex SS Double end stud bolts

Duplex steel countersunk washer

Duplex steel countersunk washer

Buy duplex stainless steel fasteners from manifest alloys in india at factory price

What is the maximum strength of duplex stainless steel fasteners ? How does this compare to other materials used in high-stress applications?

The tensile strength of duplex stainless steel fasteners can be up to 800 MPa. The minimum yield strength is 550 MPa for Grade 2205. They work excellently in offshore oil and gas refineries, chemical processing, and marine applications.

Compared to conventional stainless steel, a duplex washer is strong, resilient, and suited to chloride environments and sub-zero temperatures.

Chemical composition of duplex steel fasteners


Mo C Mn Cr Ni Si P S N Fe
3.00-3.50 .030 Max 2.00 Max 22.0-23.0 4.50-6.50 1.00 Max .030 Max .020 Max 0.14-0.20 Balance
We produce duplex washers to meet your requirements, also read our datasheet to know more about their benifits and applications

What is the fatigue strength of Duplex Fasteners? How does this compare to other materials used in high-cycle fatigue applications?

A duplex square bolt displays impressive fatigue strength depending on the stress fluctuation frequency. It has a tensile rating of 650 to 880 Mpa and a fatigue limit of around 50% of this (~ yield strength).

However, their strength may not rival materials like titanium and Inconel.

Mechanical properties of DSS bolts


Grade % Elongation YS (MPa) Hardness(BHN) UTS (MPa)
S31803 25 min. 450 min. 293 max. 620 min.
Select our duplex steel eye bolts, likewise to read the specification properties, connect with us

How do the mechanical properties of duplex threaded rod make them suitable for use in critical structural applications?

A duplex threaded rod shows 290 Brinell hardness, fatigue resistance, energy absorption, and high torque management. They fulfill structural roles in bridge and building construction.

Equivalent properties of duplex washer


STANDARD WERKSTOFF NR. UNS
Duplex 1.4462 S31803 / S32205

Manufacturing types of duplex bolts


Duplex bolts manufacturing types
 

Duplex threaded rod threads, types and length


Length: 4mm to 250 mm, also custom length available

Types:

  • Fully threaded
  • Double-end threaded
  • Tap-end studding
  • Hollow threaded
  • Fine threaded

Looking for a trustworthy duplex fastener manufacturer in India? For further details, see our specification table.

American standard of duplex stainless steel fasteners


Duplex stainless steel fasteners american standard
 

Duplex fasteners tensile strength


  • At least 5-10%

DIN standard of duplex steel nuts


  • DIN 975
  • BS 4882
  • DIN 976
  • ANSI B16.5

Tightening torques for duplex steel bolts


 

Nominal Diameter (in)

1/4″ 5/16″ 3/8″ 7/16″ 1/2″ 9/16″
Threads (in) 20 28 18 24 16 24 16 24 13 20 12 18
Torque ft-lb (Dry) 6.5 7.4 13.2 14.7 23.5 26.6 37.6 42.0 57.4 64.7 82.7 92.3
Torque ft-lb (Lubricated) 4.8 5.5 10.0 11.0 17.7 19.9 28.2 31.5 43.0 48.5 62.1 69.2

 

Nominal Diameter (in)

3/4″ 7/8″ 1″ 1-1/4″ 1-1/2″ 5/8″
Threads (in) 10 16 9 14 8 14 7 12 6 12 11 18
Torque ft-lb (Dry) 203 226 326 361 490 549 853 944 1484 1669 114.2 129.3
Torque ft-lb (Lubricated) 152 170 245 270 368 412 639 708 639 1252 85.7 97.0

Size chart of duplex stainless steel nuts


Diameter
(millimetre )
Nut size
(millimetre )
Height
(millimetre )
Hex nut Nylock nut Jam nut
5 2.5 2 - 1.6
4 2 1.6 - 1.2
5.5 3 2.4 4 1.8
8 5 4 5 2.7
7 4 3.2 5 2.2
10 6 5 6 3.2
13 8 6.5 8 4
11 7 5.5 - 3.5
17 10 8 10 5
22 14 11 14 7
19 12 10 12 6
24 16 13 16 8
30 20 16 20 10
27 18 15 18.5 9

Dimensions of duplex steel hex bolts


Bolt Size USS SAE
OD (inches) Thickness ID (inches) OD (inches) Thickness ID (inches)
5/32 (#8) - - - 0.438 .036/.065 0.188
1/8 (#6) - - - 0.375 .036/.065 0.156
7/32 (#12) - - - 0.562 .051/.080 0.250
3/16 (#10) 0.560 .036/.065 0.250 0.500 .036/.065 0.220
1/4 (#14) 0.734 .051/.080 0.312 0.625 .051/.080 0.281
3/8 1.000 .064/.104 0.438 0.812 .051/.080 0.406
5/16 0.875 .064/.104 0.375 0.688 .051/.080 0.344
7/16 1.250 .064/.104 0.500 0.922 .051/.080 0.469
9/16 1.469 .086/.132 0.625 1.156 .074/.121 0.594
1/2 1.375 .086/.132 0.562 1.062 .074/.121 0.531
5/8 1.750 .108/.160 0.688 1.312 .074/.121 0.656
7/8 2.250 .136/.192 0.938 1.750 .108/.160 0.938
3/4 2.000 .122/.177 0.812 1.469 .108/.160 0.812
1 2.500 .136/.192 1.062 2.000 .108/.160 1.062
1 1/4 3.000 .136/.192 1.375 2.500 .136/.192 1.375
1 1/8 2.750 .136/.192 1.250 2.250 .108/.160 1.250
1 3/8 3.250 .153/.213 1.500 2.750 .136/.213 1.500
1 5/8 3.750 .153/.213 1.750 - - -
1 1/2 3.500 .153/.213 1.625 3.000 .153/.213 1.625
1 3/4 4.000 .153/.213 1.875 - - -
2 4.500 .153/.213 2.125 - - -
1 7/8 4.250 .153/.213 2.000 - - -
2 1/4 4.750 .320/.248 2.375 - - -
3 5.500 .249/.327 3.125 - - -
2 1/2 5.000 .210/.280 2.625 - - -
2 3/4 5.250 .228/.410S 2.875 - - -
 

Applications and uses of duplex stainless steel fasteners


Duplex stainless steel fasteners applications
 

Duplex steel hex bolts price list


RATE/50 NOS

Length 10 12 16 20 25 30 35 40 45 50
DIA INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD
M3 180 US $ 2.16 198 US $ 2.38 206 US $ 2.47 229 US $ 2.75 262 US $ 3.14 418 US $ 5.02 505 US $ 6.06 626 US $ 7.512 711 US $ 8.532 728 US $ 8.736
M4 223 US $ 2.68 229 US $ 2.75 249 US $ 2.99 275 US $ 3.30 308 US $ 3.70 369 US $ 4.43 430 US $ 5.16 597 US $ 7.164 641 US $ 7.692 667 US $ 8.004
M5 303 US $ 3.64 322 US $ 3.86 344 US $ 4.13 385 US $ 4.62 433 US $ 5.20 496 US $ 5.95 579 US $6.95 691 US $ 8.292 758 US $ 9.096 808 US $ 9.696
M6 419 US $ 5.02 437 US $ 5.24 480 US $ 5.76 524 US $ 6.29 586 US $ 7.03 677 US $ 8.12 740 US $ 8.88 810 US $ 9.72 887 US $ 10.644 945 US $ 11.34
M8 - - - - 955 US $ 11.46 1048 US $ 12.58 1156 US $ 13.87 1314 US $ 15.77 1446 US $ 17.35 1567 US $ 18.804 1745 US $ 20.94 1845 US $ 22.14
M10 - - - - 1861 US $ 22.33 1909 US $ 22.91 2108 US $ 25.30 2281 US $ 27.37 2470 US $ 29.64 2671 US $ 32.052 2956 US $ 35.472 3185 US $ 38.22
M12 - - - - - - 2953 US $ 35.44 3115 US $ 37.38 3332 US $ 39.98 3666 US $ 43.99 3957 US $ 47.484 4315 US $ 51.78 4547 US $ 54.564
M14 - - - - - - - - 5498 US $ 65.98 5822 US $ 69.86 6256 US $ 75.07 6602 US $ 79.224 7078 US $ 84.936 7480 US $ 89.76
M16 - - - - - - - - 6760 US $ 81.12 6934 US $ 83.21 7468 US $ 89.68 8008 US $ 96.096 8517 US $ 102.204 9085 US $ 108.42
M18 - - - - - - - - - - - - - - 12310 US $ 147.72 13250 US $ 159 13766 US $ 165.192
M20 - - - - - - - - - - - - - - 13910 US $ 166.92 14954 US $ 179.448 15711 US $ 188.532
M24 - - - - - - - - - - - - - - - - - - 26886 US $ 322.632
Length 55 60 65 70 75 80 85 90 100
DIA INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD
4 712 US $ 8.544 752 US $ 9.024 797 US $ 9.564 843 US $ 10.116 892 US $ 10.704 944 US $ 11.328 995 US $ 11.94 1047 US $ 12.564 1152 US $ 13.824
5 1513 US $ 18.156 1703 US $ 20.436 1905 US $ 22.86 1997 US $ 23.964 2110 US $ 25.32 2291 US $ 27.492 2463 US $ 29.556 2623 US $ 31.476 2990 US $ 35.88
6 1109 US $ 13.308 1161 US $ 13.932 1266 US $ 15.192 1326 US $ 15.912 1473 US $ 17.676 1527 US $ 18.324 1710 US $ 20.52 1746 US $ 20.952 1946 US $ 23.352
8 2007 US $ 24.084 2095 US $ 25.14 2284 US $ 27.408 2351 US $ 28.212 2461 US $ 29.532 2677 US $ 32.124 2838 US $ 34.056 3044 US $ 36.528 3266 US $ 39.192
10 3400 US $ 40.8 3609 US $ 43.308 3885 US $ 46.62 3999 US $ 47.988 4297 US $ 51.564 4430 US $ 53.16 4767 US $ 57.204 4864 US $ 58.368 5211 US $ 62.532
12 4895 US $ 58.74 5186 US $ 62.232 5461 US $ 65.532 5735 US $ 68.82 6044 US $ 72.528 6310 US $ 75.72 6649 US $ 79.788 6902 US $ 82.824 7514 US $ 90.168
14 8020 US $ 96.24 8285 US $ 99.42 8904 US $ 106.848 9237 US $ 110.844 9681 US $ 116.172 10147 US $ 121.764 11042 US $ 132.504 11600 US $ 139.2 11942 US $ 143.304
16 9633 US $ 115.596 10236 US $ 122.832 10637 US $ 127.644 10932 US $ 131.184 11559 US $ 138.708 12255 US $ 147.06 12797 US $ 153.564 13305 US $ 159.66 14555 US $ 174.66
18 14906 US $ 178.872 15487 US $ 185.844 16448 US $ 197.376 17036 US $ 204.432 18000 US $ 216.0 18706 US $ 224.472 19469 US $ 233.628 20084 US $ 241.008 21200 US $ 254.4
20 16324 US $ 195.888 17195 US $ 206.34 18204 US $ 218.448 19251 US $ 231.012 19986 US $ 239.832 20935 US $ 251.22 21751 US $ 261.012 22632 US $ 271.584 24272 US $ 291.264
24 28375 US $ 340.5 29844 US $ 358.1288 31260 US $ 375.12 32818 US $ 393.816 34155 US $ 409.86 35606 US $ 427.272 37035 US $ 444.42 37313 US $ 447.756 40170 US $ 482.04

Price as per dia and length (inches)

Length 1/2" 3/4" 1" 1.1/4" 1.1/2" 2" 2.1/2" 3" 3.1/2" 4" 5" 6" 7" 8"
BSW RATE/50 NOS (USD)
1/8" 3.216 3.456 3.708 6.348 7.896 8.832                
3/16" 3.468 4.008 4.536 5.472 7.092 8.82 12.924 15.54            
1/4" 6.72 7.704 8.904 10.116 11.436 13.884 17.856 20.7 22.44 25.5        
5/16" 11.928 13.572 15.564 17.52 19.56 23.424 27.504 31.584 37.188 43.668 52.992      
3/8" 18.552 21.084 23.832 26.796 29.76 35.604 41.412 47.292 53.052 58.98 78.372 95.124    
7/16"     43.704 48.468 52.644 61.248 70.38 79.536 88.5 97.08 116.196 133.332    
1/2"     50.256 55.74 60.54 70.428 80.94 91.464 101.772 111.648 133.62 153.336 225.996 272.292
5/8"     93.336 95.196 102.9 119.772 134.148 158.196 165.924 181.896 225.516 259.788 321.6 363.672
3/4"         192.564 212.388 238.224 264.396 290.304 317.412 419.232 479.124    
Length 1/2" 3/4" 1" 1.1/4" 1.1/2" 2" 2.1/2" 3" 3.1/2" 4" 5" 6" 7" 8"
BSW RATE/50 NOS (INR)
1/8" 268 288 309 529 658 736                
3/16" 289 334 378 456 591 735 1077 1295            
1/4" 560 642 742 843 953 1157 1488 1725 1870 2125        
5/16" 994 1131 1297 1460 1630 1952 2292 2632 3099 3639 4416      
3/8" 1546 1757 1986 2233 2480 2967 3451 3941 4421 4915 6531 7927    
7/16"     3642 4039 4387 5104 5865 6628 7375 8090 9683 11111    
1/2"     4188 4645 5045 5869 6745 7622 8481 9304 11135 12778 18833 22691
5/8"     7778 7933 8575 9981 11179 13183 13827 15082 18793 21649 26800 30306
3/4"         16047 17699 19852 22033 24192 26451 34936 39927