SS 904L Machine ScrewASTM A479 · ASME B18.6.3 · Manufacturer, stockist & exporter, India
Alloy 904L · UNS N08904
An SS 904L machine screw is a small-diameter screw for equipment assembly, made from SS 904L to ASTM A479. Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads.
- ASTM A479
- ASME B18.6.3
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 904L Machine Screw?
- What it is
- A small-diameter screw for equipment assembly
- Material
- ASTM A479
- Dimensions
- ASME B18.6.3 · DIN 84 / 963
- Grade
- SS 904L · UNS N08904
- Best at
- Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water
SS 904L Machine Screw Specification
| Product | SS 904L Machine Screw |
|---|---|
| Material standard | ASTM A479 |
| Dimensional standard | ASME B18.6.3 · DIN 84 / 963 |
| Sizes | M10 – M64 · ½" – 4" (others on request) |
| Threads | UNC · UN-8 · metric coarse |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Machine Screw
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads.
- Pan, flat and cheese heads
- Slotted or Phillips
- M2 – M10 typical
More on choosing: Machine screw guide.
SS 904L Machine Screw: Why 904L for machine screws
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads. In SS 904L, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless fasteners resist atmospheric and process corrosion. SS 904L is picked for dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water. |
|---|---|
| Typical service | Sulphuric acid plants — Coolers, piping and tanks for dilute sulphuric acid. |
| Bolting | as the project specifies |
SS 904L Machine Screw Chemical Composition
| Element | Weight % |
|---|---|
| Nickel | 23.0 – 28.0 |
| Chromium | 19.0 – 23.0 |
| Molybdenum | 4.0 – 5.0 |
| Copper | 1.0 – 2.0 |
| Carbon | 0.020 max |
| Manganese | 2.00 max |
| Silicon | 1.00 max |
| Nitrogen | 0.10 max |
SS 904L Machine Screw Mechanical Properties
| Annealed plate & sheet | Value |
|---|---|
| Tensile strength | 490 MPa · 71 ksi |
| Yield strength 0.2% | 220 MPa · 31 ksi |
| Elongation | 35% |
| Hardness | 90 HRB max |
Full chemistry, properties and equivalents are on the SS 904L grade page.
Standards on this page
Other SS 904L fasteners
SS 904L Machine Screws for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 904L Machine Screw — questions buyers ask
What sizes are machine screws?
Usually small diameters, M2 to M10 or #2 to 3/8".
What nut is used with SS 904L machine screws?
A nut in the same alloy, machined from ASTM A479 bar, unless the project specifies otherwise.
Which standard covers SS 904L machine screws?
The material is ASTM A479; dimensions follow ASME B18.6.3 · DIN 84 / 963. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 904L machine screw?
The alloy price, the size and dimensions, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026