SS 304L Machine ScrewUNS S30403 · ASME B18.6.3 · Manufacturer, trader & exporter, India
AISI 304L · UNS S30403
An SS 304L machine screw is a small-diameter screw for equipment assembly. Finished fastener specification not asserted; UNS S30403 material — requirements to the purchase specification or project drawing. Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads.
- UNS S30403
- 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 304L Machine Screw?
- What it is
- A small-diameter screw for equipment assembly
- Finished spec
- Not asserted
- Material / feedstock
- UNS S30403 material; product form to the purchase specification
- Dimensions
- ASME B18.6.3 · DIN 84 / 963 (legacy DIN)
- Grade
- SS 304L · UNS S30403
- Best at
- Welded tanks, piping and vessels in general corrosive service
SS 304L Machine Screw Specification
| Product | SS 304L Machine Screw |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | UNS S30403 material; product form to the purchase specification |
| Dimensional standard | ASME B18.6.3 · DIN 84 / 963 (legacy DIN) |
| Manufacturing route | Route dependent on product design and purchase specification |
| Project / purchase specification | Yes — finished fastener requirements are to the purchase specification or project drawing |
| Sizes | M10 – M64 · ½" – 4" (others on request) |
| Threads | UNC · UN-8 · metric coarse |
| Testing | PMI (as specified in the PO) · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 or 3.2 on request / as specified in the PO |
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 304L Machine Screw: Why 304L for machine screws
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads. In SS 304L, 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 304L is picked for welded tanks, piping and vessels in general corrosive service. |
|---|---|
| Typical service | Process piping — Welded lines in chemical and pharma plants. |
| Bolting | ASTM A193 B8 studs with A194 8 nuts |
SS 304L Machine Screw Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Nitrogen | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S30403.
SS 304L Machine Screw Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S30403 — Annealed plate & sheet.
Full chemistry, properties and equivalents are on the SS 304L grade page.
Standards on this page
Other SS 304L fasteners
SS 304L 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 304L machine screws?
ASTM A194 8 heavy hex nuts.
Which standard covers SS 304L machine screws?
Finished fastener specification: Not asserted. Material / feedstock: UNS S30403 material; product form to the purchase specification. Dimensions: ASME B18.6.3 · DIN 84 / 963 (legacy DIN). State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a SS 304L 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 or 3.2 certificates available on request / as specified in the PO; dimensional reports as required. PMI can be arranged depending on product and requirements, as specified in the PO.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026