INCONEL 718 WASHERS - UNS N07718 / W.NR. 2.4668
■ Metric Flat Washers (DIN 125 Form A)
| NOMINAL SIZE |
INNER DIAMETER (mm) |
OUTER DIAMETER (mm) |
THICKNESS (mm) |
APPROX. WEIGHT (kg/1000 pcs) |
| M6 | 6.4 | 12.5 | 1.6 | 1.14 |
| M8 | 8.4 | 17.0 | 1.6 | 2.14 |
| M10 | 10.5 | 21.0 | 2.0 | 4.08 |
| M12 | 13.0 | 24.0 | 2.5 | 6.27 |
| M16 | 17.0 | 30.0 | 3.0 | 11.30 |
| M20 | 21.0 | 37.0 | 3.0 | 17.20 |
| M24 | 25.0 | 44.0 | 4.0 | 32.30 |
| M30 | 31.0 | 56.0 | 4.0 | 53.60 |
■ Metric Fender Washers (DIN 9021)
| NOMINAL SIZE |
INNER DIAMETER (mm) |
OUTER DIAMETER (mm) |
THICKNESS (mm) |
APPROX. WEIGHT (kg/1000 pcs) |
| M6 | 6.4 | 18.0 | 1.6 | 2.79 |
| M8 | 8.4 | 24.0 | 2.0 | 6.23 |
| M10 | 10.5 | 30.0 | 2.5 | 12.20 |
| M12 | 13.0 | 37.0 | 3.0 | 22.20 |
| M16 | 17.0 | 50.0 | 3.0 | 40.90 |
| M20 | 22.0 | 60.0 | 4.0 | 76.80 |
| M24 | 26.0 | 72.0 | 5.0 | 139.00 |
| M30 | 33.0 | 92.0 | 6.0 | 273.00 |
Engineering Note: DIN 9021 washers have an outer diameter roughly 3 times the inner diameter, providing an extended bearing surface for softer flange materials.
■ Imperial Flat Washers (ASME B18.22.1)
| NOMINAL SIZE |
SAE (NARROW) PROFILE (Inches) |
USS (WIDE) PROFILE (Inches) |
| INNER DIA |
OUTER DIA |
THICKNESS |
INNER DIA |
OUTER DIA |
THICKNESS |
| 1/4" | 0.281 | 0.625 | 0.065 | 0.312 | 0.734 | 0.065 |
| 5/16" | 0.344 | 0.688 | 0.065 | 0.375 | 0.875 | 0.083 |
| 3/8" | 0.406 | 0.812 | 0.065 | 0.438 | 1.000 | 0.083 |
| 7/16" | 0.469 | 0.922 | 0.065 | 0.500 | 1.250 | 0.083 |
| 1/2" | 0.531 | 1.062 | 0.095 | 0.562 | 1.375 | 0.109 |
| 5/8" | 0.656 | 1.312 | 0.095 | 0.688 | 1.750 | 0.134 |
■ Metric Spring Lock Washers (DIN 127 Form B)
| NOMINAL SIZE |
APPROX. WEIGHT (kg/1000 pcs) |
| M6 | 0.83 |
| M8 | 1.60 |
| M10 | 2.53 |
| M12 | 3.82 |
| M16 | 8.91 |
| M20 | 15.20 |
| M24 | 26.20 |
| M30 | 44.30 |
■ Washer-Specific Technical Specifications
| MATERIAL & SPECIFICATIONS |
Inconel 718 (UNS N07718).
- ASTM B637: Machined or forged flat washers.
- ASTM B670 / AMS 5596: Stamped washers and Belleville springs.
|
| MECHANICAL INTEGRITY |
- Tensile Strength (Min): 185 ksi (1275 MPa)
- Yield Strength (Min): 150 ksi (1034 MPa)
- Hardness: 36 to 44 HRC. (Restricted to Max 40 HRC for sour gas environments under NACE MR0175).
|
| PRIMARY ENGINEERING FUNCTIONS |
Distributes massive preloads (>150,000 psi) over larger bearing surfaces to prevent flange crushing. Vitally controls friction coefficient to mitigate severe thread galling (cold welding) during high-torque installations. |
| BELLEVILLE WASHERS (DIN 2093) |
High-performance conical disc springs used for assemblies experiencing extreme thermal cycling (-400°F to +1100°F) or significant bolt creep. Can be stacked in Parallel (to double load capacity) or in Series (to double deflection distance). |
