INCONEL 718 BOLTS — UNS N07718 / W.NR. 2.4668 DIMENSIONS, TORQUE & WEIGHT SPECS
Ananka Fasteners is an Inconel 718 bolt manufacturer, fasteners supplier and exporter in India, supporting industrial buyers seeking a stockist of Inconel 718 and traceable nickel-alloy fastening products. Our range includes Inconel 718 hex bolts, ASME B18.2.1 heavy hex bolts, DIN 933 / ISO 4014 metric hex bolts, ASME B18.3 socket head cap screws, Inconel 718 Allen bolts, stud bolts, nuts and washers. Material and product specifications may include UNS N07718 fasteners, W.Nr. 2.4668 bolts, ASTM B637 Grade N07718, AMS 5662 and AMS 5663; NACE MR0175 / ISO 15156 requirements should be confirmed against the application and supplied condition. Use the engineering tables below to review Inconel 718 bolt dimensions, thread specifications, stress area, torque, weight, yield strength, tensile strength and other mechanical properties. For the wider product range, visit our Inconel 718 Fasteners (UNS N07718) hub.
■ Inconel 718 Fasteners Manufacturer, Stockist, Supplier & Exporter
We support enquiries for Inconel 718 industrial fasteners and application-specific hardware for aerospace, oil and gas, petrochemical and power-generation projects. Available product enquiries can include custom Inconel 718 bolts, high-tensile Inconel 718 bolts, corrosion-resistant fasteners and high-temperature alloy bolts manufactured or sourced to the required drawing, material condition and specification. Standard-related enquiries may reference ASME B18.2.1, DIN 933, ISO 4014 and ASME B18.3. Please confirm the required dimensions, grade, heat-treatment condition, certification and service environment when requesting a quotation.
■ ASME B18.2.1 Inconel 718 Heavy Hex Bolt Dimensions Chart (Imperial)
| NOMINAL DIA (Inches) |
DECIMAL EQUIV (Inches) |
UNC PITCH (TPI) |
WIDTH ACROSS FLATS (Basic) |
WIDTH ACROSS CORNERS (Min) |
HEAD HEIGHT (Basic) |
STRESS AREA (in²) |
MIN YIELD LOAD @ 150 KSI (lbs) |
| 1/4" | 0.2500 | 20 | 1/2" | 0.556 | 11/64" | 0.0318 | 4,770 |
| 5/16" | 0.3125 | 18 | 9/16" | 0.628 | 7/32" | 0.0524 | 7,860 |
| 3/8" | 0.3750 | 16 | 11/16" | 0.768 | 1/4" | 0.0775 | 11,620 |
| 7/16" | 0.4375 | 14 | 3/4" | 0.840 | 19/64" | 0.1063 | 15,950 |
| 1/2" | 0.5000 | 13 | 7/8" | 0.982 | 11/32" | 0.1419 | 21,280 |
| 5/8" | 0.6250 | 11 | 1-1/16" | 1.191 | 27/64" | 0.2260 | 33,900 |
| 3/4" | 0.7500 | 10 | 1-1/4" | 1.403 | 1/2" | 0.3345 | 50,170 |
| 7/8" | 0.8750 | 9 | 1-7/16" | 1.615 | 37/64" | 0.4617 | 69,260 |
| 1" | 1.0000 | 8 | 1-5/8" | 1.826 | 43/64" | 0.6057 | 90,860 |
| 1-1/8" | 1.1250 | 7 | 1-13/16" | 2.038 | 3/4" | 0.7633 | 114,490 |
| 1-1/4" | 1.2500 | 7 | 2" | 2.249 | 27/32" | 0.9691 | 145,370 |
| 1-1/2" | 1.5000 | 6 | 2-3/8" | 2.673 | 1" | 1.4053 | 210,790 |
| 2" | 2.0000 | 4.5 | 3-1/8" | 3.520 | 1-11/32" | 2.4982 | 374,730 |
Engineering Note: Heavy hex heads provide a significantly larger bearing surface across the flats compared to standard hex bolts, distributing the massive 150,000 psi yield clamp load generated by Inconel 718 bolts to prevent flange crushing on ASME B16.5 pressure joints.
■ DIN 933 / ISO 4014 Inconel 718 Metric Hex Bolt Dimensions (mm)
| NOMINAL SIZE (D) |
PITCH (mm) |
WIDTH ACROSS FLATS (S) |
WIDTH ACROSS CORNERS (E) |
HEAD HEIGHT (K) |
STRESS AREA (mm²) |
MIN YIELD LOAD @ 1034 MPa (kN) |
| M6 | 1.00 | 10.00 | 11.05 | 4.00 | 20.1 | 20.8 |
| M8 | 1.25 | 13.00 | 14.38 | 5.50 | 36.6 | 37.9 |
| M10 | 1.50 | 17.00 | 18.90 | 7.00 | 58.0 | 60.0 |
| M12 | 1.75 | 19.00 | 21.10 | 8.00 | 84.3 | 87.1 |
| M16 | 2.00 | 24.00 | 26.75 | 10.00 | 156.7 | 162.0 |
| M20 | 2.50 | 30.00 | 33.14 | 13.00 | 244.8 | 253.1 |
| M24 | 3.00 | 36.00 | 39.98 | 15.00 | 352.5 | 364.5 |
| M30 | 3.50 | 46.00 | 51.28 | 19.00 | 560.6 | 579.6 |
| M36 | 4.00 | 55.00 | 61.31 | 23.00 | 816.7 | 844.5 |
■ DIN 912 / ISO 4762 Inconel 718 Socket Head Cap Screws (Allen Bolts)
| NOMINAL SIZE (D) |
COARSE PITCH (mm) |
HEAD DIAMETER (Dk Max) |
HEAD HEIGHT (K Max) |
HEX SOCKET KEY SIZE (S) |
MIN SOCKET DEPTH (t) |
| M6 | 1.00 | 10.00 | 6.00 | 5.00 | 3.00 |
| M8 | 1.25 | 13.00 | 8.00 | 6.00 | 4.00 |
| M10 | 1.50 | 16.00 | 10.00 | 8.00 | 5.00 |
| M12 | 1.75 | 18.00 | 12.00 | 10.00 | 6.00 |
| M16 | 2.00 | 24.00 | 16.00 | 14.00 | 8.00 |
| M20 | 2.50 | 30.00 | 20.00 | 17.00 | 10.00 |
| M24 | 3.00 | 36.00 | 24.00 | 19.00 | 12.00 |
| M30 | 3.50 | 45.00 | 30.00 | 22.00 | 15.50 |
■ Inconel 718 Bolt Torque Chart — Imperial (Lubricated vs. Dry)
| IMPERIAL DIA (TPI) |
TARGET PRELOAD @ 65% YIELD (lbs) |
TORQUE (LUBRICATED) ft-lbs |
TORQUE (DRY) ft-lbs |
| 1/4" - 20 | 3,100 | 12.0 | 16.2 |
| 5/16" - 18 | 5,109 | 24.9 | 33.1 |
| 3/8" - 16 | 7,556 | 44.1 | 58.8 |
| 1/2" - 13 | 13,835 | ~ 100.0 | ~ 130.0 |
| 5/8" - 11 | 22,035 | ~ 200.0 | ~ 260.0 |
| 3/4" - 10 | 32,565 | ~ 350.0 | ~ 450.0 |
| 7/8" - 9 | 45,045 | ~ 540.0 | ~ 700.0 |
| 1" - 8 | 59,085 | ~ 800.0 | ~ 1000.0 |
| 1-1/4" - 7 | 94,487 | 1598.0 | 2132.0 |
Warning: Inconel 718 bolts are exceptionally susceptible to thread galling. Dry installation frequently results in an erratic K-factor and severe thread seizure. Premium boundary lubricants (MoS2 or Nickel anti-seize pastes), PTFE/Xylan® coatings, or AMS 2410 silver plating are strictly recommended.
■ Inconel 718 Metric Bolt Torque Specifications (Nm)
| METRIC SIZE |
COARSE PITCH (mm) |
TARGET CLAMP LOAD @ 65% YIELD (kN) |
MAX TORQUE RANGE (Nm) |
| M6 | 1.00 | 13.5 | 17.0 - 19.9 |
| M8 | 1.25 | 24.6 | 41.3 - 48.3 |
| M10 | 1.50 | 39.0 | 81.8 - 95.7 |
| M12 | 1.75 | 56.6 | 143.0 - 167.0 |
| M16 | 2.00 | 105.5 | 354.0 - 413.0 |
| M20 | 2.50 | 164.7 | 690.0 - 809.0 |
| M24 | 3.00 | 237.3 | 1195.0 - 1395.0 |
| M30 | 3.50 | 376.9 | 2377.0 - 2774.0 |
■ Estimated Mass & Structural Weight Chart (Imperial — lbs per 100 Pcs)
| LENGTH (Under Head) |
1/2" DIA (lbs per 100) |
5/8" DIA (lbs per 100) |
3/4" DIA (lbs per 100) |
7/8" DIA (lbs per 100) |
1" DIA (lbs per 100) |
| 1-1/2" | 12.8 | 21.4 | 33.9 | 49.2 | 69.6 |
| 2" | 15.5 | 25.6 | 39.0 | 56.8 | 78.8 |
| 3" | 20.9 | 34.0 | 51.1 | 73.4 | 99.0 |
| 4" | 26.2 | 42.4 | 63.2 | 90.0 | 120.0 |
| 6" | 37.0 | 59.2 | 87.3 | 123.2 | 163.0 |
■ Estimated Mass & Structural Weight Chart (Metric DIN 933)
| METRIC SIZE |
BASE WEIGHT (Ref) |
30 mm LENGTH (kg / 100 Pcs) |
50 mm LENGTH (kg / 100 Pcs) |
75 mm LENGTH (kg / 100 Pcs) |
100 mm LENGTH (kg / 100 Pcs) |
| M6 | 0.75 | 0.84 | 1.20 | 1.66 | 2.13 |
| M8 | 1.50 | 1.66 | 2.32 | 3.15 | 3.98 |
| M10 | 3.00 | 3.01 | 4.05 | 5.36 | 6.67 |
| M12 | 5.40 | 4.33 | 5.84 | 7.74 | 9.64 |
| M16 | 19.20 | 8.26 | 11.04 | 14.51 | 17.99 |
| M20 | — | 14.81 | 19.16 | 24.59 | 30.02 |
| M24 | — | 23.17 | 29.43 | 37.25 | 45.07 |
| M30 | — | 43.35 | 53.24 | 65.60 | 77.97 |
■ Inconel 718 Bolt Mechanical Properties & Technical Specifications (UNS N07718)
| MATERIAL & MATRIX |
Inconel 718 (UNS N07718 / W.Nr. 2.4668 / EN NiCr19Fe19Nb5Mo3 / BS HR8). A precipitation-hardenable nickel-chromium-iron-molybdenum superalloy (Density: 8.19 g/cm³ / 0.296 lb/in³). Utilizes Niobium and Titanium to form coherent gamma double-prime (γ'', Ni3Nb) and gamma prime (γ') strengthening precipitates. |
| CHEMICAL COMPOSITION |
- Primary Elements: Nickel (Ni+Co): 50.0–55.0% | Chromium (Cr): 17.0–21.0% | Iron (Fe): Balance (~17%)
- Hardening & Alloying Additions: Niobium + Tantalum (Nb+Ta): 4.75–5.50% | Molybdenum (Mo): 2.80–3.30% | Titanium (Ti): 0.65–1.15% | Aluminum (Al): 0.20–0.80%
- Maximum Trace Limits: Cobalt (Co) ≤ 1.00% | Carbon (C) ≤ 0.08% | Mn ≤ 0.35% | Si ≤ 0.35% | Cu ≤ 0.30% | P ≤ 0.015% | S ≤ 0.015% | Boron (B) ≤ 0.006%
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| MECHANICAL INTEGRITY |
- Yield Strength (0.2% Offset Min): 150,000 psi (1034 MPa) | NACE MR0175 Sour Gas Condition: 120,000 psi (827 MPa)
- Tensile Strength (Min): 185,000 psi (1275 MPa) | NACE MR0175 Sour Gas Condition: 150,000 psi (1034 MPa)
- Elongation & Hardness: 12% Min Elongation (20% Min for NACE) | 36 to 44 HRC (331 to 444 HBW) | 40 HRC Max for NACE MR0175
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| SPECIFICATIONS & HEAT TREATMENT |
- ASTM A1014 / ASTM B637 / ASTM F468 Gr. N07718: High-temperature bolting specifications ensuring extreme creep-rupture longevity up to 704°C (1300°F).
- AMS 5662: Supplied solution-annealed (1750°F–1850°F / 954°C–1010°C) for heavy hot forging and precision thread rolling.
- AMS 5663: Fully solution-annealed and dual-stage precipitation age-hardened (720°C for 8 hrs, furnace cooled to 620°C for 8 hrs) for maximum tensile strength.
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| BOLT HEAD STYLES & PROFILES |
Hex Bolts (ISO 4014 / ISO 4017 / DIN 931 / DIN 933), Heavy Hex Bolts (ASME B18.2.1), Socket Head Cap Screws / Allen Bolts (DIN 912 / ISO 4762 / ASME B18.3), Countersunk Socket Screws (DIN 7991), 12-Point Flange & Aerospace Tension Bolts (MS14181 / NAS6704), Eye Bolts (DIN 444), and U-Bolts. |
| THREAD FABRICATION (UN vs UNJ) |
For aerospace and critical industrial use, UNJ threads (MIL-S-8879 / AS8879) with an enlarged, controlled root radius (0.15011P to 0.18042P) are frequently specified to reduce stress concentrations. Rolling threads prior to aging highly refines the grain structure, increasing tension-tension fatigue life by up to 113% over single-point cut threads. |
| ENVIRONMENTAL RESISTANCE |
Virtually immune to chloride stress-corrosion cracking (SCC). Approved under NACE MR0175 / ISO 15156 and API 6A718 for sour gas (H2S) service up to 40 HRC without risk of hydrogen embrittlement. Sustains structural loads safely from cryogenic -423°F (-253°C) up to 1300°F (704°C). |
| MATCHING HARDWARE & CERTIFICATIONS |
Supplied with 100% PMI test reports and EN 10204 3.1 MTC. Pair with our matching Inconel 718 Nuts (ASME B18.2.2 ASTM F467 Heavy Hex Nuts), Inconel 718 Washers, ASME B16.5 Inconel 718 Stud Bolts, or download the Inconel 718 Technical Datasheet (PDF).
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