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Super Duplex Steel S32750 fasteners are high-performance fastening components engineered for extreme environments where standard stainless steel fails. Manufactured from UNS S32750 alloy, these fasteners combine high tensile strength with exceptional resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. They are widely specified under ASTM and ISO standards for critical applications in offshore oil & gas, chemical processing, and marine engineering.
| Parameter | Specification |
|---|---|
| Material | Super Duplex Stainless Steel |
| Grade | UNS S32750 (DIN 1.4410) |
| Size Range | M6 to M100 / 1/4" to 4" |
| Thread Type | Metric, UNC, UNF, BSW, BSF |
| Standards | ASTM A479, ASTM A182, ISO, DIN, BS, ASME |
| Types | Hex Bolts, Nuts, Stud Bolts, Threaded Rods, Washers |
| Surface Finish | Plain, Passivated, PTFE Coated, Hot Dip Galvanized |
| Tensile Strength | ≥ 800 MPa |
| Yield Strength | ≥ 550 MPa |
| Hardness | Max 32 HRC |
| STANDARD | WERKSTOFF NR. | UNS |
|---|---|---|
|
Super Duplex 2507
|
1.4410 |
S32750 |
All measurements in millimeters
NOMINAL SIZE (D) |
BODY DIAMETER |
BOLT HEAD THICKNESS |
ACROSS THE FLATS |
ACROSS CORNERS |
||||
|---|---|---|---|---|---|---|---|---|
D (MAX) |
D (MIN) |
H (MAX) |
H (MIN) |
F (MAX) |
F (MIN) |
C (MAX) |
C (MIN) |
|
m10 |
10.00 |
9.78 |
6.63 |
6.17 |
17.00 |
15.73 |
18.48 |
17.77 |
m12 |
12.00 |
11.73 |
7.76 |
4.24 |
19.00 |
17.73 |
20.78 |
20.03 |
m14 |
14.00 |
13.73 |
9.09 |
8.51 |
22.00 |
20.67 |
24.25 |
23.35 |
m16 |
16.00 |
15.73 |
10.32 |
9.68 |
24.00 |
23.67 |
27.71 |
26.75 |
m20 |
20.00 |
19.67 |
12.88 |
12.12 |
30.00 |
29.16 |
34.64 |
32.95 |
m24 |
24.00 |
23.67 |
15.44 |
14.56 |
36.00 |
35.00 |
41.57 |
39.55 |
m30 |
30.00 |
29.67 |
19.48 |
17.92 |
46.00 |
45.00 |
53.12 |
50.85 |
m36 |
36.00 |
35.61 |
23.38 |
21.63 |
55.00 |
53.80 |
63.51 |
60.79 |
m42 |
42.00 |
41.38 |
26.97 |
25.03 |
65.00 |
62.90 |
75.06 |
71.71 |
m48 |
48.00 |
47.38 |
31.07 |
28.93 |
75.00 |
72.60 |
86.60 |
82.76 |
m56 |
56.00 |
55.26 |
36.2 |
33.80 |
85.00 |
82.20 |
98.15 |
93.71 |
m64 |
64.00 |
63.26 |
41.32 |
38.68 |
95.00 |
91.80 |
109.70 |
104.65 |
m72 |
72.00 |
71.26 |
46.45 |
43.55 |
105.00 |
101.40 |
121.24 |
115.60 |
m80 |
80.00 |
79.26 |
51.58 |
48.42 |
115.00 |
111.00 |
132.72 |
126.54 |
m90 |
90.00 |
89.13 |
57.74 |
54.26 |
130.00 |
125.50 |
150.11 |
143.07 |
m100 |
90.00 |
99.13 |
63.9 |
60.10 |
145.00 |
140.00 |
167.43 |
159.60 |
Super Duplex Steel S32750 fasteners are used in environments requiring high strength and exceptional corrosion resistance, particularly in chloride-rich and high-pressure conditions.
Super Duplex Steel S32750 fasteners are typically produced through hot forging followed by CNC machining to achieve precise dimensions and threading. Heat treatment processes ensure optimal microstructure and mechanical properties.
Quality control includes dimensional inspection using calibrated gauges, tensile and hardness testing, and surface finish verification. Each batch is traceable through heat numbers and supported with mill test certificates (MTC as per EN 10204 3.1).
At KK Fasteners, every production lot undergoes strict inspection protocols aligned with ISO 9001 standards, ensuring consistency across global supply requirements and critical project specifications.
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Super Duplex Steel S32750 fasteners are high-strength, corrosion-resistant fastening components made from UNS S32750 alloy. They are specifically designed for use in aggressive environments such as offshore platforms, marine systems, and chemical processing plants where resistance to chloride corrosion and high mechanical strength are essential.
S32750 contains higher levels of chromium, molybdenum, and nitrogen compared to standard duplex grades like S32205. This results in a PREN value above 40, providing superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking, making it suitable for more demanding applications.
Super Duplex S32750 fasteners are manufactured in accordance with international standards such as ASTM A479, ASTM A182, ASME, ISO, DIN, and BS. These standards ensure consistency in mechanical properties, dimensional accuracy, and performance across global industrial applications.
The selection depends on load requirements, environmental exposure, and assembly conditions. Stud bolts are preferred for high-pressure flange connections, while hex bolts are widely used in structural applications. Coatings like PTFE may be selected to reduce galling and improve installation performance.
A reliable supplier should provide full material traceability, mill test certificates, and compliance with international standards. Experience in global exports, consistent quality control, and the ability to handle custom specifications are key factors. KK Fasteners supports such requirements with documented quality assurance and international supply capability.
