INCONEL 625 NUTS - UNS N06625 / W.NR. 2.4856
■ Imperial Heavy Hex Nut Dimensions (ASME B18.2.2)
| NOMINAL SIZE |
WIDTH ACROSS FLATS (Max) |
WIDTH ACROSS CORNERS (Max) |
THICKNESS (Max) |
| 1/2" |
0.875 |
1.010 |
0.504 |
| 5/8" |
1.062 |
1.227 |
0.631 |
| 3/4" |
1.250 |
1.443 |
0.758 |
| 7/8" |
1.438 |
1.660 |
0.885 |
| 1-1/4" |
2.000 |
2.309 |
1.251 |
| 1-3/8" |
2.188 |
2.526 |
1.378 |
| 1-1/2" |
2.375 |
2.742 |
1.505 |
Engineering Note: In high-pressure petrochemical and industrial applications, Heavy Hex Nuts are preferred over standard hex nuts. Their wider geometry provides a massive bearing footprint to distribute extreme clamping loads across the flange face.
■ Metric Heavy Hex Nut Dimensions (ASME B18.2.4.6M)
| NOMINAL SIZE & PITCH |
WIDTH ACROSS FLATS (Max) |
WIDTH ACROSS CORNERS (Max) |
THICKNESS (Max) |
| M36 x 4 |
60.00 |
69.28 |
36.6 |
| M42 x 4.5 |
70.00 |
80.83 |
42.0 |
| M48 x 5 |
80.00 |
92.38 |
48.0 |
| M56 x 5.5 |
90.00 |
103.92 |
56.0 |
| M64 x 6 |
100.00 |
115.47 |
64.0 |
Note: For standard metric hex nuts rather than heavy hex, the globally accepted dimensioning standard is DIN 934 or its modern equivalent, ISO 4032.
■ Nut-Specific Technical Specifications
| Material & Standard |
Inconel 625 (UNS N06625 / W.Nr. 2.4856). Strictly governed by ASTM F467 (Standard Specification for Nonferrous Nuts for General Use). |
| Mechanical Integrity |
- Minimum Proof Stress: 60,000 psi (60 ksi) without stripping internal threads.
- Hardness Bandwidth: 85 HRB to 35 HRC.
|
| Machining & Threading |
Due to rapid work-hardening and poor thermal conductivity:
- CNC Thread Milling is preferred over traditional tapping for superior chip evacuation.
- Requires TiAlN or AlTiN coated carbide tooling.
- Continuous high-pressure coolant (>500 PSI) and strict spindle speeds (30-50 SFM) are required.
|
| Tribology & Galling Prevention |
Immense contact pressure can shear the protective oxide layer, causing severe cold-welding (thread galling). Mandatory Lubrication: Nuts must never be installed dry. Use high-solids anti-seize (MoS2 or nickel-based paste). Utilize slow, steady, continuous-motion torqueing (no high-speed pneumatic impact wrenches). |
