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W.Nr. 2.4668 Double End Stud
QS Fastener: W.Nr. 2.4668 Double End Stud
Name: W.Nr. 2.4668 Double End Stud
Standard: DIN
Material: Inconel 718
Size: M24
Lenght: 250 mm
Temperature: -250 to 700℃
Surface: Natural color
Standard: DIN
Material: Inconel 718
Size: M24
Lenght: 250 mm
Temperature: -250 to 700℃
Surface: Natural color
Quantity
W.Nr. 2.4668 Double End Stud is made of Inconel 718 nickel-based alloy, conforms to DIN standard, size M24×250 mm. Natural-color surface; retains high strength and fatigue resistance from –250 °C to 700 °C. Ideal for flanged joints in LNG plants, nuclear power and super-critical turbines where low-temperature toughness and high-temperature creep resistance are critical—install once, rely for life.
How to install and maintain Inconel 718 fasteners correctly? Any special requirements?
I. Installation
1. Cleaning
Wipe W.Nr. 2.4668 Double End Stud, nuts and flange holes with acetone or lint-free cloth to remove scale and chloride ions. In an offshore wind project a steel brush left Cl⁻ residues; stress-corrosion cracking (SCC) occurred after 700 h.
1. Cleaning
Wipe W.Nr. 2.4668 Double End Stud, nuts and flange holes with acetone or lint-free cloth to remove scale and chloride ions. In an offshore wind project a steel brush left Cl⁻ residues; stress-corrosion cracking (SCC) occurred after 700 h.
2. Lubrication
Even silver- or nickel-plated W.Nr. 2.4668 Double End Stud must be coated over the full thread length with high-temperature anti-seize (Ni or Cu based, –40–900 °C). Completely filling the threads reduces torque scatter by 50 %.
Even silver- or nickel-plated W.Nr. 2.4668 Double End Stud must be coated over the full thread length with high-temperature anti-seize (Ni or Cu based, –40–900 °C). Completely filling the threads reduces torque scatter by 50 %.
3. Alignment
For M24 and larger W.Nr. 2.4668 Double End Stud, hand-run three threads before using a wrench to avoid cross-threading. If flange misalignment >0.5 mm, remachine; otherwise preload drops 30 %.
For M24 and larger W.Nr. 2.4668 Double End Stud, hand-run three threads before using a wrench to avoid cross-threading. If flange misalignment >0.5 mm, remachine; otherwise preload drops 30 %.
4. Preload
Use “torque-plus-angle”. Example for M24×3 mm W.Nr. 2.4668 Double End Stud, target clamp force Fm = 280 kN: ① 200 N·m; ② 400 N·m; ③ additional 60°±5°. Record simultaneously with an electronic torque-angle gun; scatter ≤±5 %.
Use “torque-plus-angle”. Example for M24×3 mm W.Nr. 2.4668 Double End Stud, target clamp force Fm = 280 kN: ① 200 N·m; ② 400 N·m; ③ additional 60°±5°. Record simultaneously with an electronic torque-angle gun; scatter ≤±5 %.
5. Temperature compensation
At 700 °C the thermal expansion of W.Nr. 2.4668 Double End Stud is ~30 % higher than low-alloy steel; hot retightening requires an extra 15° angle to prevent relaxation.
At 700 °C the thermal expansion of W.Nr. 2.4668 Double End Stud is ~30 % higher than low-alloy steel; hot retightening requires an extra 15° angle to prevent relaxation.
II. Maintenance
1. First check
Retighten W.Nr. 2.4668 Double End Stud at 24 h and 100 h after start-up; record angle increase. If >10°, replace.
1. First check
Retighten W.Nr. 2.4668 Double End Stud at 24 h and 100 h after start-up; record angle increase. If >10°, replace.
2. Intervals
LNG pumps at –180 °C: every 2 years; super-critical turbines at 700 °C: every 6 months—full coverage of W.Nr. 2.4668 Double End Stud.
LNG pumps at –180 °C: every 2 years; super-critical turbines at 700 °C: every 6 months—full coverage of W.Nr. 2.4668 Double End Stud.
3. Inspection
Use phased-array UT on thread roots of W.Nr. 2.4668 Double End Stud (1 mm sensitivity) plus PT dye-check on surface.
Use phased-array UT on thread roots of W.Nr. 2.4668 Double End Stud (1 mm sensitivity) plus PT dye-check on surface.
4. Replacement
If galling, chipping or preload loss >20 % is found, replace the complete set of W.Nr. 2.4668 Double End Stud; mixing old and new is forbidden. Cut old studs to scrap to prevent re-use.
If galling, chipping or preload loss >20 % is found, replace the complete set of W.Nr. 2.4668 Double End Stud; mixing old and new is forbidden. Cut old studs to scrap to prevent re-use.
5. Re-lubrication
Clean and recoat anti-seize before each retightening; otherwise W.Nr. 2.4668 Double End Stud may seize at high temperature and breakout torque can triple, damaging the seal face.
Clean and recoat anti-seize before each retightening; otherwise W.Nr. 2.4668 Double End Stud may seize at high temperature and breakout torque can triple, damaging the seal face.
III. Special requirements
- Do not touch W.Nr. 2.4668 Double End Stud with carbon-steel tools; iron pickup causes high-temperature embrittlement.
- Do not touch W.Nr. 2.4668 Double End Stud with carbon-steel tools; iron pickup causes high-temperature embrittlement.
- Store at RH <50 %, isolated from acids, alkalis and chlorides; use immediately after opening. If not installed within 24 h, reclean.
Follow the above steps and the service life of W.Nr. 2.4668 Double End Stud will extend from 5 to 15+ years, eliminating high-temperature flange-leak risk.
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