904L Stainless Steel Fasteners
904L is an unstabilized highly alloyed, low carbon stainless steel grade belonging to the austenitic class of steels. What makes 904L different from the other austenitic alloys is the significant content of copper in its alloy. The addition of copper in its alloy plays a major role in its resistance to acids, especially solutions containing sulfuric acid.

Although the 904L Stainless Steel Fasteners is highly resistant to acetic acid, sulfuric acid and phosphoric acid in comparison to the more traditional chromium steel grades, use of 904L in halide acidic solutions and acids, such chlorine, fluorine, etc must be limited. This is because halogen containing solutions such as hydrochloric acid quickly decays the alloy. However, the 904L Bolts Nuts has an excellent performance in chloride solutions, due to its high resistance to pitting, crevice corrosion as well as stress related corrosion cracking.
This being said, SS 904L Screws outperforms other austenitic stainless steels since this particular alloy has a higher alloying content of both nickel as well as molybdenum. 904L Stainless Steel Washers are a disk shaped fitting, available in different shapes and are usually used where a load of a threaded fastener is to be distributed. The threaded fastener in this instance could be a 904L Hex Nut. Generally used in applications such as building, plumbing and general maintenance, the Stainless Steel 904L Threaded Rod helps to stabilise objects made from wood, metal or other materials.
Physical Properties of 904L Stainless Steel Washers
Product | 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 |
904L Bolts Nuts Dimensional Table

Minimal Size (D) | THE FLATS | HEAD THICKNESS | BODY DIAMETER | CORNERS | ||||
---|---|---|---|---|---|---|---|---|
F (MAX) | F (MIN) | H (MAX) | H (MIN) | D (MAX) | D (MIN) | C (MAX) | C (MIN) | |
m16 | 24.00 | 23.67 | 10.32 | 9.68 | 16.00 | 15.73 | 27.71 | 26.75 |
m10 | 17.00 | 15.73 | 6.63 | 6.17 | 10.00 | 9.78 | 18.48 | 17.77 |
m48 | 75.00 | 72.60 | 31.07 | 28.93 | 48.00 | 47.38 | 86.60 | 82.76 |
m100 | 145.00 | 140.00 | 63.9 | 60.10 | 90.00 | 99.13 | 167.43 | 159.60 |
m12 | 19.00 | 17.73 | 7.76 | 4.24 | 12.00 | 11.73 | 20.78 | 20.03 |
m14 | 22.00 | 20.67 | 9.09 | 8.51 | 14.00 | 13.73 | 24.25 | 23.35 |
m90 | 130.00 | 125.50 | 57.74 | 54.26 | 90.00 | 89.13 | 150.11 | 143.07 |
m24 | 36.00 | 35.00 | 15.44 | 14.56 | 24.00 | 23.67 | 41.57 | 39.55 |
m30 | 46.00 | 45.00 | 19.48 | 17.92 | 30.00 | 29.67 | 53.12 | 50.85 |
m20 | 30.00 | 29.16 | 12.88 | 12.12 | 20.00 | 19.67 | 34.64 | 32.95 |
m80 | 115.00 | 111.00 | 51.58 | 48.42 | 80.00 | 79.26 | 132.72 | 126.54 |
m36 | 55.00 | 53.80 | 23.38 | 21.63 | 36.00 | 35.61 | 63.51 | 60.79 |
m42 | 65.00 | 62.90 | 26.97 | 25.03 | 42.00 | 41.38 | 75.06 | 71.71 |
m64 | 95.00 | 91.80 | 41.32 | 38.68 | 64.00 | 63.26 | 109.70 | 104.65 |
m72 | 105.00 | 101.40 | 46.45 | 43.55 | 72.00 | 71.26 | 121.24 | 115.60 |
m56 | 85.00 | 82.20 | 36.2 | 33.80 | 56.00 | 55.26 | 98.15 | 93.71 |
904L Hex Nut standard quality specification
Specification | ASTM B673/ ASME SB673 |
Lengths | From 3 upto 200 Millimetre |
In Form of: | Round, Threading, Hex, Square as per Gauge Etc. |
---|---|
Sizing | 3/6 inch upto 2 inch | M3 – M56 |
Stainless steel 904L screws Threads | BSF, METRIC, UNC, BSW, UNF or as per needs |
Equivalent grades of 904L Stainless Steel Fasteners
Product | UNS No | Old British | Euronorm | Japanese JIS | ||
BS | En | No | Name | |||
904L | N08904 | 904S13 | X1NiCrMoCu25-20-5 | 1.4539 | – | SUS 890L |
Stainless Steel 904L Threaded Rod Chemical Resistance Guide
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 |
Mechanical Strength of SS 904L Screws
Yield Strength 0.2% Proof (MPa) min | Tensile Strength (MPa) min | Elongation (% in 50mm) min | Hardness | |
Brinell (HB) max | Rockwell B (HR B) max | |||
220 | 490 | 35 | – | 70-90 typical |
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