Flat Washer

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Flat Washers (Plain Washers) are essential interface components designed to distribute the clamping load of a threaded fastener over a larger surface area, preventing damage to the mating part and reducing the risk of embedment or loosening. In high-performance assemblies, the washer acts as a critical barrier against galvanic corrosion between dissimilar metals. At Inconel Fasteners, we manufacture flat washers from premium sheet and plate stock to standards like DIN 125, ISO 7089, and ASME B18.22.1. Available in grades like Inconel 625, 718, and Monel 400, our washers are precision-stamped or machined to ensure perfect flatness and concentricity, providing a stable bearing surface for flanges in subsea, aerospace, and chemical processing environments.

Detailed Specifications

Size Range
M2 to M100 Metric #4 to 4″ Imperial
Washer Series / Type
DIN 125A (Standard) DIN 9021 (Large OD / Fender) ASME B18.22.1 (SAE / USS) F436 (Hardened)
Thickness Options
Standard Sheet Thickness Heavy Duty (Thick) Shim Washers (Ultra Thin)
Type of Manufacturing
Punching / Stamping (Sheet) Machined from Bar (Thick) Laser Cutting Waterjet Cutting
Dimensional Standards
ISO 7089 (Normal) ISO 7090 (Chamfered) DIN 125 Form A / B JIS B 1256
Raw Material Origin
Indian Origin European Origin Japanese Origin US Origin Korean Origin
Finish Part Origin
Made in India Custom Origin per Request
Surface Coating
Plain / Mill Finish Passivated Silver Plating PTFE / Xylan Gold Plating
Marking
Grade ID (e.g., INC 625) Manufacturer Logo Heat Code (On Large Sizes)
Heat Treatment Details
Annealed (Standard) Age Hardened (For 718) Hardened & Tempered
Delivery Terms
Ex-Works (EXW) FOB CIF CFR DDP
Packing Type
Poly Bags (Small Qty) Carton Boxes Wooden Pallets
Payment Methods
L/C (Letter of Credit) T/T (Wire Transfer) Western Union
Certifications
ISO 9001:2015 MTC EN 10204 3.1 RoHS Compliance
Additional Certifications
NABL Lab Reports Dimensional Inspection Hardness Test Report
Mandatory Requirements
Positive Material Identification (PMI) Flatness Check Burr-Free Edges

Available Inconel Grades & Standards

Dimensions Chart (ISO 7089 / DIN 125A)

Nominal Size
(Screw Size)		 Inner Diameter (d1)
(Min)		 Outer Diameter (d2)
(Max)		 Thickness (h)
(Nominal)
M3 3.2 mm 7.0 mm 0.5 mm
M4 4.3 mm 9.0 mm 0.8 mm
M5 5.3 mm 10.0 mm 1.0 mm
M6 6.4 mm 12.0 mm 1.6 mm
M8 8.4 mm 16.0 mm 1.6 mm
M10 10.5 mm 20.0 mm 2.0 mm
M12 13.0 mm 24.0 mm 2.5 mm
M16 17.0 mm 30.0 mm 3.0 mm
M20 21.0 mm 37.0 mm 3.0 mm
M24 25.0 mm 44.0 mm 4.0 mm
M30 31.0 mm 56.0 mm 4.0 mm
M36 37.0 mm 66.0 mm 5.0 mm

Chemical Composition (Washer Grades)

Grade Ni (Nickel) Cr (Chromium) Mo (Molybdenum) Nb (Niobium) Fe (Iron) Other Elements
Inconel 625 58.0% Min 20.0 - 23.0% 8.0 - 10.0% 3.15 - 4.15% 5.0% Max Al 0.4% Max
Inconel 718 50.0 - 55.0% 17.0 - 21.0% 2.8 - 3.3% 4.75 - 5.5% Balance Ti 0.65 - 1.15%
Inconel 600 72.0% Min 14.0 - 17.0% - - 6.0 - 10.0% Mn 1.0%

Mechanical Properties (Flat Washers)

Grade Hardness (HV)
(Vickers)		 Tensile Strength
(MPa) Min		 Condition Key Attribute
Inconel 718 350 - 450 HV 1275 Age Hardened High Load Bearing
Inconel 625 180 - 240 HV 827 Annealed Corrosion Resistance
Inconel 600 130 - 180 HV 550 Annealed Oxidation Resistance

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
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