Belleville Washers, technically known as Conical Spring Washers or Disc Springs, are precision-engineered components designed to maintain high tension (preload) in bolted assemblies subject to extreme thermal cycling, bolt creep, or vibration. Unlike flat washers, Bellevilles act as powerful springs; they deflect under load and rebound to compensate for any relaxation in the joint, effectively "live-loading" the flange to prevent leakage. While standard steel springs relax and fail above 250°C, our Inconel Belleville Washers are manufactured from precipitation-hardened superalloys like Inconel X-750 and Inconel 718. These grades retain their spring properties up to 700°C, making them the industry standard for securing valves, heat exchangers, and bus bars in power generation and petrochemical plants. We manufacture these to DIN 2093 and DIN 6796 standards.
Detailed Specifications
Size Range
Washer Series (Load Profile)
Stacking Arrangements
Dimensional Standards
Type of Manufacturing
Raw Material Origin
Finish Part Origin
Surface Coating (Critical)
Marking
Heat Treatment Details
Delivery Terms
Packing Type
Payment Methods
Certifications
Additional Certifications
Mandatory Requirements
Available Inconel Grades & Standards
Dimensions Chart (DIN 2093 Disc Springs)
| Nominal Size (Bolt Dia) |
Inner Diameter (di) (H13) |
Outer Diameter (De) (h11) |
Thickness (t) (Material) |
Total Height (lo) (Free Height) |
|---|---|---|---|---|
| M6 | 6.2 mm | 12.5 mm | 0.7 mm | 1.0 mm |
| M8 | 8.2 mm | 16.0 mm | 0.9 mm | 1.25 mm |
| M10 | 10.2 mm | 20.0 mm | 1.1 mm | 1.55 mm |
| M12 | 12.2 mm | 25.0 mm | 1.5 mm | 2.05 mm |
| M16 | 16.3 mm | 31.5 mm | 1.75 mm | 2.45 mm |
| M20 | 20.4 mm | 40.0 mm | 2.25 mm | 3.15 mm |
| M24 | 25.4 mm | 50.0 mm | 2.5 mm | 3.5 mm |
| M30 | 31.0 mm | 63.0 mm | 3.5 mm | 4.9 mm |
| M36 | 37.0 mm | 80.0 mm | 5.0 mm | 6.7 mm |
| M42 | 43.0 mm | 90.0 mm | 5.0 mm | 7.0 mm |
Chemical Composition (Spring Alloy Grades)
| Grade | Ni (Nickel) | Cr (Chromium) | Ti (Titanium) | Al (Aluminum) | Nb (Niobium) | Application |
|---|---|---|---|---|---|---|
| Inconel X-750 | 70.0% Min | 14.0 - 17.0% | 2.25 - 2.75% | 0.4 - 1.0% | 0.7 - 1.2% | Max Temp 700°C |
| Inconel 718 | 50.0 - 55.0% | 17.0 - 21.0% | 0.65 - 1.15% | 0.2 - 0.8% | 4.75 - 5.5% | Max Temp 650°C |
| Inconel 625 | 58.0% Min | 20.0 - 23.0% | 0.4% Max | 0.4% Max | 3.15 - 4.15% | Corrosion (Low Load) |
Mechanical Properties (Heat Treated Condition)
| Grade | Hardness (HRC) (Rockwell C) |
Tensile Strength (MPa) Min |
Elastic Modulus (GPa at 20°C) |
Relaxation Resistance |
|---|---|---|---|---|
| Inconel X-750 | 40 - 50 HRC | 1150 - 1400 | 214 GPa | Excellent |
| Inconel 718 | 40 - 48 HRC | 1300 - 1500 | 200 GPa | Very Good |
| Inconel 625 | 30 - 40 HRC | 827 - 1000 | 205 GPa | Fair (Creeps) |
DIN Standards for Bolts
Comprehensive list of dimensional standards for industrial fasteners.
Series 100 - 900
- DIN 186
- DIN 188
- DIN 261
- DIN 444
- DIN 479
- DIN 580
- DIN 601
- DIN 603
- DIN 604
- DIN 605
- DIN 610
- DIN 787
- DIN 797
- DIN 931
- DIN 933
- DIN 933 SZ
Nuts & Precision
- DIN 431
- DIN 439 A/B
- DIN 466
- DIN 467
- DIN 508
- DIN 547
- DIN 548
- DIN 555
- DIN 557
- DIN 562
- DIN 582
- DIN 798
- DIN 917
- DIN 934
- DIN 935
- DIN 936
- DIN 937
Studs & Washers
- DIN 525
- DIN 835
- DIN 938
- DIN 939
- DIN 940
- DIN 976
- DIN 125 A/B
- DIN 126
- DIN 127 A/B
- DIN 433
- DIN 440 R/V
- DIN 6796
- DIN 7980
- DIN 9021
Extended & Heavy Series
DIN 3570
DIN 7968
DIN 7969
DIN 7990
DIN 7992
DIN 70613
DIN 70614
DIN 80705
DIN 6331
DIN 6334
DIN 6915
DIN 6924