Taper Washer

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Taper Washers, also known as Bevel Washers, are structural fasteners specifically designed to compensate for the lack of parallelism between the bearing surface of a bolt head or nut and the sloped flanges of structural profiles. Standard steel channels (U-beams) and I-beams typically feature flanges with an 8% or 14% slope; tightening a standard flat washer on these surfaces causes bending stress on the bolt shank, leading to premature fatigue failure. Our Inconel Taper Washers are precision-machined with a matching 8% (DIN 434) or 14% (DIN 435) wedge angle to ensure a perfectly perpendicular clamping force. Manufactured from corrosion-resistant alloys like Inconel 625, these washers are critical for securing structural supports in offshore platforms, chemical plants, and marine environments where structural integrity cannot be compromised by galvanic corrosion.

Detailed Specifications

Size Range
M8 to M56 Metric 1/4” to 2-1/2″ Imperial
Taper Angle / Slope
8% Slope (For U-Beams/Channels) 14% Slope (For I-Beams) 5 Degree (Custom)
Washer Configuration
Square Taper (Standard) Rectangular Taper Round Taper (Special) Grooved (For Grip)
Dimensional Standards
DIN 434 (8% Channel) DIN 435 (14% I-Beam) ASME B18.23.1 (Beveled) ASTM F436 Type D
Type of Manufacturing
CNC Machined from Bar (High Precision) Milled from Plate Forged (Mass Production)
Raw Material Origin
Indian Origin European Origin Japanese Origin US Origin
Finish Part Origin
Made in India Custom Origin per Request
Surface Coating
Hot Dip Galvanized (HDG) Mechanical Zinc Plain / Oil Black Passivated Xylan / PTFE
Marking
Typically Unmarked Die Stamped (Large Sizes) Ink Marked
Heat Treatment Details
Solution Annealing Stress Relieving Hardened (F436 Style)
Delivery Terms
Ex-Works (EXW) FOB CIF DDP
Packing Type
Heavy Duty Gunny Bags Wooden Crates Carton Boxes
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
Dimensional Inspection Report Angle Verification Report
Mandatory Requirements
Positive Material Identification (PMI) Visual Inspection (Angle) Hardness Check

Available Inconel Grades & Standards

Dimensions Chart (DIN 434 / DIN 435 Square Taper)

Nominal Size
(Bolt Dia)		 DIN 434 (8% Taper)
For U-Channels		 DIN 435 (14% Taper)
For I-Beams		 Square Width
(Both)		 Hole Dia
(d1)
M8 8% Slope 14% Slope 22 mm 9.0 mm
M10 8% Slope 14% Slope 22 mm 11.0 mm
M12 8% Slope 14% Slope 26 mm 13.5 mm
M16 8% Slope 14% Slope 32 mm 17.5 mm
M20 8% Slope 14% Slope 40 mm 22.0 mm
M22 8% Slope 14% Slope 44 mm 24.0 mm
M24 8% Slope 14% Slope 56 mm 26.0 mm
M27 8% Slope - 56 mm 30.0 mm
M30 8% Slope 14% Slope 62 mm 33.0 mm
M36 8% Slope - 68 mm 39.0 mm

Chemical Composition (Common Structural Grades)

Grade Ni (Nickel) Cr (Chromium) Mo (Molybdenum) Fe (Iron) Cu (Copper) Other
Inconel 625 58.0% Min 20.0 - 23.0% 8.0 - 10.0% 5.0% Max - Nb 3.15-4.15%
Inconel 825 38.0 - 46.0% 19.5 - 23.5% 2.5 - 3.5% 22.0% Min 1.5 - 3.0% Ti 0.6-1.2%
Inconel 600 72.0% Min 14.0 - 17.0% - 6.0 - 10.0% 0.5% Max -

Mechanical Properties (Taper Washers)

Grade Tensile Strength
(MPa) Min		 Yield Strength
(0.2% Offset) Min		 Hardness
(Max)		 Condition
Inconel 625 827 414 220 HB Annealed
Inconel 718 1275 1035 40 HRC Age Hardened
Inconel 825 586 241 165 HB Annealed

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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