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Super Duplex Fasteners

Super duplex fasteners

What are the advantages of using Super Duplex Fasteners over other materials?

A distinctive microstructure containing ferrite and austenite grades (50-50) lends superior corrosion resistance and strength to these components. Popular choices of super duplex fasteners include 2507 and 2760. Their constitutions have similar chromium and nickel proportions (25, 7%). But the latter has more silicon and copper; molybdenum, nitrogen, and manganese are lesser.

Super duplex screws deliver several sought-after advantages:

  • Their tensile and yield strength exceeds duplex alternatives at 800 and 550 Mpa.
  • Super duplex steel washers resist stress-corrosion cracking.
  • These fasteners are available in different types and sizes, like rods, washers, and bolts.

Super duplex nuts can work in ballast water systems, desalination plants, industrial scrubbers, pollution control, and power generation.


Manufacturer of SDSS Hex Bolt and Nut at Lowest Price in India, Check Specification

Super Duplex Fasteners Specification



Stainless Steel Super Duplex Bolt Delivery Schedules


Country Name Oman Qatar Israel Saudi Arabia Egypt
Delivery Time (Days) 7-8 8-10 12-15 8-10 11-13

Find Super Duplex Steel Studs and Threaded Rod in Metric, BSF, UNC and UNF Thread, Check American Standards

American Standards of Super Duplex Alloy Screws


Super duplex fasteners american standards
 

What are the specific application requirements that Super Duplex Fasteners can meet? How can buyers choose the right product to suit their needs?

Super duplex steel U-bolts adapt to diverse settings, from petrochemicals and marine industries to seawater cooling systems and mining. These fasteners offer longer service life under elevated temperatures (-50 to 300° C) and stress. SDSS hex bolts also have good wear resistance.

However, this material is expensive and tricky to work with, mainly due to its hardness and strength. Buyers should consider application compatibility, budget, availability, and long-term performance. The chosen vendor should prioritise quality control and tight tolerance while offering low lead times for consistent supply.

We are top SDSS bolt and nut manufacturer in India, check our huge stock for your applications, We supply SDSS fasteners to Congo, Gabon, and Guinea in 7-10 days.

Types of SDSS Fasteners


SDSS hex bolts

SDSS hex bolts

Super duplex eye bolt

Super duplex eye bolt

Steel super duplex nut bolts

Steel super duplex nut bolts

SS super duplex square bolts

SS super duplex square bolts

SDSS flange bolts

SDSS flange bolts

Stainless steel super duplex U bolts

Stainless steel super duplex U bolts

Super duplex alloy carriage bolts

Super duplex alloy carriage bolts

Stainless super duplex J bolts

Stainless super duplex J bolts

SDSS washers

SDSS washers

Super duplex steel screws

Super duplex steel screws

Get Super Duplex Stainless Steel Screws in Metric Size Ranging From M1.2 – M48, Check Size Chart

Super Duplex Nuts Size chart


Nut size(mm) Diameter*(mm) Height(mm)
hex nuts nylock nuts jam nuts
2 4 1.6 - 1.2
3 5.5 2.4 4 1.8
2.5 5 2 - 1.6
4 7 3.2 5 2.2
5 8 4 5 2.7
6 10 5 6 3.2
8 13 6.5 8 4
7 11 5.5 - 3.5
10 17 8 10 5
14 22 11 14 7
12 19 10 12 6
16 24 13 16 8
20 30 16 20 10
18 27 15 18.5 9

What is the pitting resistance equivalent (PRE) of Super Duplex Fasteners? How does this value impact their performance in corrosive environments?

Brilliant corrosion resistance is a coveted characteristic of super duplex stainless steel fasteners. Their PREN (pitting resistance equivalent number) is also at 40 to 45, thanks to the inclusion of elements like molybdenum and nitrogen. Different super duplex threaded rod grades have slightly variable PRENs but are usually over 40.

Pitting resistance makes a super duplex stud bolt ideal for demanding conditions in flue gas desulphurisation and oil and gas exploration. It can also withstand brine, formic acids, chlorides, and acetic acid.

Check Super Duplex Alloy Socket Head Cap Screw Chemical Composition and Torque Chart

Super Duplex Steel Hex Bolts Chemical Composition



SDSS Bolt Torque Chart


Nominal Diameter (in) 1-1/2″ 5/16″ 7/8″ 3/8″ 5/8″ 1/2″ 3/4″ 7/16″ 1″ 1/4″ 9/16″ 1-1/4″
Threads (in) 6 12 18 24 9 14 16 24 11 18 13 20 10 16 14 20 8 14 20 28 12 18 7 12
Torque ft-lb (Lubricated) 1271 1430 11.4 12.6 280 309 20.2 22.8 97.9 110.9 49.1 55.4 174 194 32.3 36 420 471 5.5 6.3 71 79.1 730 809
Torque ft-lb (Dry) 1696 1908 15.1 16.8 373 412 26.9 30.4 130.5 147.8 65.6 73.9 232 258 43 48 560 628 7.4 8.4 94.5 105.5 975 1079

Super Duplex Steel Fasteners Useful Informations


SDSS fasteners useful informations
Find Stainless Steel Super Duplex Washers in Milled, Half Point and Sheared End, View Properties

SDSS Hex Threaded Rod Mechanical Properties


Grade Density Melting point Yield strength(0.2% offset) Tensile strength Elongation
S32750/S32760 7.8g/cm3 1350°C(2460°F) PSi-80000, MPa-550 PSi-116000, MPa-800 15%

Equivalent Grade of Super Duplex Stud Bolt


Grade Common Name EN UNS ASTM/ASME
European North America US
2507 Alloy 2507 ® SAF 1.4410 UNS S32750 SA479 / F53 / A479

SDSS Nut Dimensions


SDSS nut dimensions  
Thread diameter (nominal size) F G H
Width across flats Width across corners Nut thickness
Max Basic Min Min Max Basic Min Max
5/16 0.3125 .500 1/2 .489 .557 .577 17/64 .258 .273
7/16 0.4375 .688 11/16 .675 .768 .794 3/8 .365 .385
3/8 0.3750 .562 9/16 .551 .628 .650 21/64 .479 .337
1/2 0.5000 .750 3/4 .736 .840 .866 7/16 .427 .448
5/8 0.6250 .938 15/16 .922 1.051 1.083 35/64 .535 .559
9/16 0.5625 .875 7/8 .861 .982 1.010 31/64 .473 .496
3/4 0.7500 1.125 1-1/8 1.088 1.240 1.299 41/64 .617 .665
1 1.0000 1.500 1-1/2 1.450 1.653 1.732 55/64 .831 .887
7/8 0.8750 1.312 1-5/16 1.269 1.447 1.516 3/4 .724 .776
1-1/8 1.1250 1.688 1-11/16 1.631 1.859 1.949 31/32 .939 .999
1-1/2 1.500 2.250 2-1/4 2.175 2.480 2.598 1-9/32 1.245 1.ASTM A194 GR. 8
1-3/8 1.3750 2.062 2-1/16 1.994 2.273 2.382 1-11/64 1.138 1.206
1-5/8 1.6250 2.438 2-7/16 2.356 2.686 2.815 1-25/64 1.353 1.429
1/4 0.2500 .438 7/16 .428 .488 .505 7/32 .212 .226
2 2.0000 3.000 3 2.900 3.306 3.464 1-23/32 1.675 1.763
1-3/4 1.7500 2.625 2-5/8 2.538 2.893 3.031 1-1/2 1.460 1.540
2-1/4 2.2500 3.375 3-3/8 3.263 3.719 3.897 1-15/16 1.890 1.986
2-3/4 2.7500 4.125 4-1/8 3.988 4.546 4.763 2-3/8 2.319 2.431
2-1/2 2.5000 3.750 3-3/4 3.625 4.133 4.330 2-5/32 2.105 2.209

Applications of ASTM A1082M SDSS J Bolts


Applications of ASTM A1082M SDSS J bolts

Super Duplex Steel Hex Bolt Price List


RATE/50 NOS.

Length 10 12 16 20 25 30 35 40 45 50 55
DIA INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD INR USD
6 690 8.28 703 8.44 792 9.504 894 10.728 996 11.952 1112 13.34 1228 14.74 1341 16.09 1494 17.93 1621 19.45 1785 21.42
8         1618 19.416 1804 21.648 2009 24.108 2224 26.69 2436 29.23 2644 31.73 2892 34.70 3071 36.85 3322 39.86
10         3071 36.852 3357 40.284 3672 44.064 3980 47.76 4281 51.37 4624 55.49 4956 59.47 5305 63.66 5646 67.75
12             5006 60.072 5421 65.052 5893 70.71 6401 76.81 6890 82.68 7189 86.27 7870 94.44 8160 97.92
14                 8388 100.656 8926 107.11 9589 115.07 10118 121.42 10840 130.08 11466 137.59 12290 147.48
16                 10929 131.148 11445 137.34 12329 147.95 13221 158.65 14059 168.71 15000 180.00 15900 190.80
20                             22844 274.13 24557 294.68 25801 309.61 26807 321.68
24                                     40947 491.36 43214 518.57
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
6 1785 21.42 1879 22.55 2083 25.00 2192 26.30 2370 28.44 2468 29.62 2789 33.47 2853 34.24 3129 37.55
8 3322 39.86 3501 42.01 3782 45.38 3924 47.09 4131 49.57 4409 52.91 4776 57.31 4956 59.47 5329 63.95
10 5646 67.75 5994 71.93 6452 77.42 6641 79.69 7134 85.61 7344 88.13 7902 94.82 8054 96.65 8614 103.37
12 8160 97.92 8842 106.10 9101 109.22 9811 117.73 10340 124.08 10837 130.04 11169 134.03 11884 142.61 12885 154.62
14 12290 147.48 12731 152.77 13644 163.73 14174 170.09 14887 178.64 15594 187.13 16965 203.58 17834 214.01 18345 220.14
16 15900 190.80 16900 202.80 17564 210.77 18491 221.89 19224 230.69 20508 246.10 21470 257.64 22350 268.20 23958 287.50
20 26807 321.68 28238 338.86 29766 357.19 31469 377.63 32821 393.85 34380 412.56 - - 37168 446.02 39861 478.33
24 43214 518.57 45452 545.42 47609 571.31 49981 599.77 52017 624.20 54226 650.71 56404 676.85 56826 681.91 61178 734.14

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"
BSW RATE/50 NOS (US $)
1/4" 10.57 12.28 14.21 16.46 18.19 22.08 27.53 31.81 35 39.78    
5/16" 18.74 21.56 24.76 27.89 31.12 37.34 43.8 50.26 58.24 70.64    
3/8" 29.1 33.32 37.75 42.41 47.08 56.29 65.49 74.74 83.89 93.19 119.2 142.84
1/2"     79.93 88.48 96.3 112.29 128.87 145.49 161.89 177.85 210.49 239.87
5/8"     146.23 151.49 163.68 191.27 215.16 251.71 263.96 287.62 355.16 408.13
3/4"         325.07 358.52 402.14 446.32 489.91 535.82 625.13 714.44
Length 1/2" 3/4" 1" 1.1/4" 1.1/2" 2" 2.1/2" 3" 3.1/2" 4" 5" 6"
BSW RATE/50 NOS (INR)
1/4" 881 1023 1184 1372 1516 1840 2294 2651 2917 3315    
5/16" 1562 1797 2063 2324 2593 3112 3650 4188 4853 5887    
3/8" 2425 2777 3146 3534 3923 4691 5457 6228 6991 7766 9933 11903
1/2"     6661 7373 8025 9358 10739 12124 13491 14821 17541 19989
5/8"     12186 12624 13640 15939 17930 20976 21997 23968 29598 34011
3/4"         27089 29877 33512 37193 40838 44652 52094 59536