SS 316 / 316L U-boltUNS S31603 · MSS SP-58 / manufacturer standard · Manufacturer, trader & exporter, India
AISI 316L · UNS S31603
An SS 316 / 316L u-bolt is a U-shaped bolt for clamping pipes to supports. Finished fastener specification not asserted; UNS S31603 material — requirements to the purchase specification or project drawing. U-bolts hold pipes to supports and structures. Sized by pipe NPS with a threaded length on each leg.
- UNS S31603
- MSS SP-58 / manufacturer standard
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 316 / 316L U-bolt?
- What it is
- A U-shaped bolt for clamping pipes to supports
- Finished spec
- Not asserted
- Material / feedstock
- UNS S31603 material; product form to the purchase specification
- Dimensions
- MSS SP-58 / manufacturer standard
- Grade
- SS 316 / 316L · UNS S31603
- Best at
- Chloride-bearing process fluids, marine air and pharmaceutical service
SS 316 / 316L U-bolt Specification
| Product | SS 316 / 316L U-bolt |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | UNS S31603 material; product form to the purchase specification |
| Dimensional standard | MSS SP-58 / manufacturer standard |
| 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 an U-bolt
U-bolts hold pipes to supports and structures. Sized by pipe NPS with a threaded length on each leg.
- Sized to pipe NPS
- With nuts and plates
- Matching or isolated material
More on choosing: U-bolt guide.
SS 316 / 316L U-bolt: Why 316L for u-bolts
U-bolts hold pipes to supports and structures. Sized by pipe NPS with a threaded length on each leg. In SS 316 / 316L, 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 316 / 316L is picked for chloride-bearing process fluids, marine air and pharmaceutical service. |
|---|---|
| Typical service | Chemical & process — Piping and vessels handling mild acids and chlorides. |
| Bolting | ASTM A193 B8M studs with A194 8M nuts |
SS 316 / 316L U-bolt Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Molybdenum | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Nitrogen | As specified |
| Phosphorus | 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 S31603.
SS 316 / 316L U-bolt 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 S31603 — Annealed plate & sheet (316L).
Full chemistry, properties and equivalents are on the SS 316 / 316L grade page.
Standards on this page
Other SS 316 / 316L fasteners
SS 316 / 316L U-bolt — questions buyers ask
Should U-bolts match the pipe material?
Use the same alloy, or an isolating sleeve, to avoid galvanic corrosion between pipe and bolt.
What nut is used with SS 316 / 316L u-bolts?
ASTM A194 8M heavy hex nuts.
Which standard covers SS 316 / 316L u-bolts?
Finished fastener specification: Not asserted. Material / feedstock: UNS S31603 material; product form to the purchase specification. Dimensions: MSS SP-58 / manufacturer standard. State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a SS 316 / 316L u-bolt?
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