INCONEL 718 STUDS & THREADED RODS - UNS N07718
■ Component Definitions (ASME B18.31.2)
- Continuous Thread Studs ("All-Thread"): Threaded from end to end. The most common fastener for flanged connections.
- Tap-End Studs: Threads on both ends with an unthreaded center. The short end (Tap End) features a Class 3-fit designed to be permanently driven into a tapped hole.
- Double-End Studs: Threads of equal or unequal length on both ends with an unthreaded center. Designed to clamp components between two nuts (neither end is an interference fit).
■ ASME B18.31.2 Tap-End Stud Dimensions (Inches)
| NOMINAL SIZE |
TAP END THREAD LENGTH (Nominal) |
TAP END THREAD LENGTH (Min) |
NUT END THREAD LENGTH (Min) for L > 16" |
| 1/4" | 0.375 | 0.350 | 1.500 |
| 5/16" | 0.469 | 0.440 | 1.625 |
| 3/8" | 0.563 | 0.532 | 1.750 |
| 7/16" | 0.656 | 0.620 | 1.875 |
| 1/2" | 0.750 | 0.708 | 2.000 |
| 5/8" | 0.938 | 0.892 | 2.250 |
| 3/4" | 1.125 | 1.075 | 2.500 |
| 1" | 1.500 | 1.438 | 3.000 |
| 1-1/4" | 1.875 | 1.813 | 3.500 |
■ ASME B18.31.2 Double-End Stud Dimensions (Inches)
| NOMINAL SIZE |
NUT END THREAD LENGTH (Min) for L ≤ 10" |
NUT END THREAD LENGTH (Min) for 10" < L ≤ 16" |
NUT END THREAD LENGTH (Min) for L > 16" |
| 1/4" | 0.750 | 1.000 | 1.500 |
| 3/8" | 1.000 | 1.250 | 1.750 |
| 1/2" | 1.250 | 1.500 | 2.000 |
| 5/8" | 1.500 | 1.750 | 2.250 |
| 3/4" | 1.750 | 2.000 | 2.500 |
| 7/8" | 2.000 | 2.250 | 2.750 |
| 1" | 2.250 | 2.500 | 3.000 |
| 1-1/4" | 2.750 | 3.000 | 3.500 |
| 1-1/2" | 3.250 | 3.500 | 4.000 |
■ Threaded Rod Weight Chart (kg/m)
| METRIC RODS (DIN 976) |
|
IMPERIAL RODS (UNC) |
| SIZE |
APPROX. WEIGHT (kg/m) |
|
SIZE |
APPROX. WEIGHT (kg/m) |
| M6 | 0.177 | | 1/4" | 0.194 |
| M8 | 0.319 | | 5/16" | 0.323 |
| M10 | 0.500 | | 3/8" | 0.469 |
| M12 | 0.725 | | 1/2" | 0.896 |
| M14 | 0.970 | | 9/16" | 1.096 |
| M16 | 1.330 | | 5/8" | 1.342 |
| M20 | 2.080 | | 3/4" | 2.021 |
| M24 | 3.000 | | 1" | 3.638 |
| M30 | 4.750 | | 1-1/4" | 5.718 |
| M36 | 6.900 | | 1-1/2" | 8.281 |
| M42 | 9.400 | | 1-3/4" | 11.231 |
| M48 | 12.400 | | 2" | 14.741 |
Logistics Note: Exact weights for continuous threaded rods are essential for structural load calculations and offshore shipping manifests.
■ Stud-Specific Technical Specifications
| MATERIAL & SPECIFICATIONS |
Inconel 718 (UNS N07718).
- ASTM A1014: High-temperature precipitation-hardening bolting standard.
- ASTM B637: Raw forging stock standard.
|
| MECHANICAL INTEGRITY (ASTM A1014) |
- Tensile Strength: Min 185 ksi (1275 MPa) @ RT; 145 ksi (1000 MPa) @ 1200°F.
- Yield Strength: Min 150 ksi (1035 MPa) @ RT; 125 ksi (860 MPa) @ 1200°F.
- Stress Rupture: Survives 100,000 psi continuous load at 1200°F for a minimum of 23 hours.
|
| ENGINEERING ADVANTAGE OVER BOLTS |
Studs allow for uniform tensioning from both ends (highly advantageous for hydraulic tensioning equipment in subsea manifolds), actively eliminating torsional stress in the fastener body during assembly. |
