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Stainless Steel 904L Fasteners are high-alloy, super austenitic fastening components designed for extreme corrosion environments where standard stainless steels like 304 or 316 fail. Manufactured using a low-carbon, high-nickel, high-molybdenum composition (UNS N08904), these fasteners deliver exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking—especially in chloride-rich and acidic conditions.
They are widely used in chemical processing plants, offshore oil & gas systems, desalination units, and pharmaceutical equipment where long-term structural integrity is critical. Conforming to standards such as ASTM B649, DIN, and ISO, these fasteners ensure dimensional accuracy and metallurgical reliability in mission-critical assemblies.
KK Fasteners supplies Stainless Steel 904L Fasteners with full traceability, precision machining, and export-grade quality control for industries operating across aggressive environments worldwide.
| Parameter | Specification |
|---|---|
| Material | Stainless Steel 904L (UNS N08904), Austenitic Super Alloy |
| Grade Options | 904L, 1.4539 Equivalent |
| Size Range | M3 to M100 / 1/8" to 4" |
| Thread Type | Metric, UNC, UNF, BSW, Custom Threads |
| Standards | ASTM B649, DIN 1.4539, ISO 3506, BS, JIS |
| Surface Finish | Bright, Polished, Passivated, Anti-galling Coated |
| Types | Bolts, Nuts, Screws, Studs, Washers, Anchors |
| Tensile Strength | 490–700 MPa (depending on cold work condition) |
| 904L | C | Mn | Si | P | S | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
|
min. |
– |
– |
– |
– |
– |
19.0 |
4.00 |
23.00 |
0.10
|
|
max. |
0.20 |
2.00 |
1.00 |
0.045 |
0.035 |
23.0 |
5.00 |
28.00 |
0.25 |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness Rockwell B (HR B) max | Hardness Brinell (HB) max |
|---|---|---|---|---|---|
|
904L |
490 |
220 |
35 |
70-90 typical |
– |
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
0-1000C |
0-3150C |
0-5380C |
at 1000C |
at 5000C
|
|
|
|
904L
|
8000
|
200
|
15.0
|
–
|
–
|
13.0 |
–
|
500
|
850 |
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
|---|---|---|---|---|---|---|---|
|
|
|
BS |
En |
No |
Name
|
|
|
|
904L
|
N08904
|
904S13
|
X1NiCrMoCu25-20-5
|
1.4539
|
–
|
–
|
SUS 890L
|
All measurements in millimeters
| NOMINAL SIZE (D) | BODY DIAMETER | HEAD THICKNESS ASTM A193 | ACRO ASTMA193 THE FLATS | ACRO ASTM A193 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
|
Stainless Steel 904L Fasteners are used in highly corrosive industrial environments where standard stainless steel grades cannot maintain long-term structural integrity.
Stainless Steel 904L Fasteners are manufactured using precision cold forging followed by CNC thread rolling to ensure dimensional accuracy and mechanical consistency. Heat treatment is carefully controlled to maintain optimal corrosion resistance without compromising structural integrity.
Each batch undergoes rigorous quality inspection including hardness testing, tensile strength verification, and surface finish evaluation. Spectrochemical analysis ensures alloy composition consistency in line with ASTM B649 requirements.
KK Fasteners implements full lot traceability and ISO 9001:2015-certified quality systems, ensuring that every fastener meets global industrial compliance standards. Additional certifications such as RoHS and REACH compliance support export readiness for regulated markets.
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Stainless Steel 904L Fasteners are high-alloy fastening components made from UNS N08904 super austenitic stainless steel. They are designed for highly corrosive environments such as chemical processing, seawater exposure, and acidic conditions. Their high nickel and molybdenum content provides excellent resistance to pitting, crevice corrosion, and stress corrosion cracking.
904L contains significantly higher levels of nickel, chromium, and molybdenum compared to grades like 304 and 316. This enhanced alloy composition gives it superior corrosion resistance, especially in chloride-rich and acidic environments, making it suitable for extreme industrial applications where standard stainless steels fail.
Stainless Steel 904L Fasteners are typically manufactured according to ASTM B649, DIN 1.4539, ISO 3506, BS, and JIS standards. These specifications ensure consistent mechanical strength, accurate dimensions, and reliable corrosion resistance for global industrial use.
These fasteners are widely used in chemical processing plants, offshore oil and gas platforms, desalination units, pharmaceutical equipment, and power generation systems. They are chosen for applications involving exposure to seawater, acids, and other highly corrosive media.
A reliable supplier should offer ISO-certified production, full material traceability, compliance with ASTM/DIN standards, and proven export experience. Companies like KK Fasteners also provide testing certificates, quality inspection reports, and global supply support for industrial buyers.
Stainless Steel 904L Fasteners are engineered for environments where corrosion resistance directly determines system reliability and lifecycle cost. With precision manufacturing, certified quality systems, and global export capability, KK Fasteners delivers consistent performance for critical engineering applications worldwide.
For technical specifications, project pricing, or custom manufacturing support, contact the engineering team at KK Fasteners to request a detailed quotation or material test certificate.
