Fasteners · MSS SP-58 / manufacturer standard
U-bolt — MSS SP-58 / manufacturer standard
U-bolt — a U-shaped bolt for clamping pipes to supports. U-bolts hold pipes to supports and structures. Sized by pipe NPS with a threaded length on each leg.
- MSS SP-58 / manufacturer standard
- 18 grades
- EN 10204 3.1 / 3.2
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
U-bolt: What to Know Before Ordering
- Sized to pipe NPS
- With nuts and plates
- Matching or isolated material
U-bolt Materials & Grades
| Grade | Material standard | Best for |
|---|---|---|
| Inconel 825 u-bolt | ASTM B425 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| SS 904L u-bolt | ASTM B649 | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| SS 304 u-bolt | ASTM A193 B8 · A194 8 | General corrosion resistance, food, water and architectural work |
| SS 304L u-bolt | ASTM A193 B8 · A194 8 | Welded tanks, piping and vessels in general corrosive service |
| SS 310 / 310S u-bolt | ASTM A276 / A479 | Furnaces, burners and heat treatment at high temperature |
| SS 316 / 316L u-bolt | ASTM A193 B8M · A194 8M | Chloride-bearing process fluids, marine air and pharmaceutical service |
| SS 321 u-bolt | ASTM A193 B8T | High-temperature service between 425 and 815 °C |
| SS 347 u-bolt | ASTM A193 B8C | Welded high-temperature piping in refineries and power plants |
| Duplex 2205 u-bolt | ASTM A276 / A479 | Strength with chloride resistance at a stainless-steel budget |
| Super Duplex 2507 u-bolt | ASTM A276 / A479 | Seawater and high-chloride service where strength also matters |
| Inconel 600 u-bolt | ASTM B166 | High-temperature oxidation, caustic and nuclear service |
| Inconel 625 u-bolt | ASTM B446 | Seawater, high strength and high temperature in one alloy |
| Inconel 718 u-bolt | ASTM B637 | Very high strength at temperatures up to about 650 °C |
| Incoloy 800 / 800H / 800HT u-bolt | ASTM B408 | Furnaces, petrochemical heaters and high-temperature piping |
| Hastelloy C276 u-bolt | ASTM B574 | The most aggressive mixed acids, wet chlorine and hypochlorite |
| Hastelloy C22 u-bolt | ASTM B574 | Mixed oxidising and reducing acids, and weld overlays |
| Monel 400 u-bolt | ASTM B164 | Seawater, hydrofluoric acid and marine service |
| Monel K500 u-bolt | ASTM B865 | High-strength pump shafts, bolting and springs in seawater |
Other fasteners
Stud boltA fully threaded rod supplied with two heavy hex nuts.Hex boltA bolt with a hexagonal head.Heavy hex nutA thicker and wider hexagon nut for pressure bolting.Hex nutA standard hexagon nut.WasherA flat or spring ring that spreads bolt load.Threaded rodA continuously threaded bar cut to length.Eye boltA bolt with a loop head for lifting or anchoring.Anchor boltA bolt that fixes structures or equipment to concrete.Foundation boltA heavy bolt set in concrete for machinery bases.Socket head cap screwA screw with a cylindrical head and hexagon socket.Machine screwA small-diameter screw for equipment assembly.
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.
Which grades are u-bolts available in?
Inconel 825, SS 904L, SS 304, SS 304L, SS 310 / 310S, SS 316 / 316L, SS 321, SS 347, Duplex 2205, Super Duplex 2507, Inconel 600, Inconel 625, Inconel 718, Incoloy 800 / 800H / 800HT, Hastelloy C276, Hastelloy C22, Monel 400, Monel K500.
Which standard covers u-bolt dimensions?
MSS SP-58 / manufacturer standard. The material standard depends on the grade.
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