Lock Washer / Split / Spring Washer

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Lock Washers (Split or Spring Washers) are helical coils designed to prevent fastener loosening caused by vibration, thermal cycling, and dynamic loads. Upon tightening, the split ends of the washer bite into the mating surfaces (the nut and the substrate), while the helical shape acts as a compressed spring to maintain preload tension on the assembly. Unlike standard steel washers that lose their temper and flatten permanently under high heat, our Inconel Lock Washers are manufactured from precipitation-hardened alloys like Inconel X-750 and Inconel 718. These grades retain their modulus of elasticity (spring properties) even at temperatures exceeding 600°C, making them indispensable for securing turbine casings, exhaust manifolds, and high-pressure pumps. We manufacture these to DIN 127, ASME B18.21.1, and DIN 7980 standards.

Detailed Specifications

Size Range
M2 to M100 Metric #2 to 4″ Imperial
Washer Configuration
Helical Spring Lock (Split) Curved / Wave Washer Belleville (Disc Spring) Internal/External Tooth
Wire Section Profile
Square Section (Standard) Rectangular / Flat Section Heavy Duty (Thick)
Dimensional Standards
DIN 127 Form B (Flat Ends) DIN 127 Form A (Bent Ends) ASME B18.21.1 DIN 7980 (For Cap Screws)
Type of Manufacturing
Coiling & Cutting (Wire) Stamping / Pressing
Raw Material Origin
Indian Origin European Origin Japanese Origin US Origin
Finish Part Origin
Made in India Custom Origin per Request
Surface Coating
Plain / Oil Finish Silver Plating (For High Temp) Passivated Zinc Plated (Mechanical) Black Oxide
Marking
Typically Unmarked (Small Sizes) Grade ID on Packaging Manufacturer Logo (Large Sizes)
Heat Treatment (Critical)
Spring Temper Age Hardened (Precipitation) Stress Relieved
Delivery Terms
Ex-Works (EXW) FOB CIF DDP
Packing Type
Small Poly Bags Carton Boxes Wooden Pallets
Payment Methods
L/C (Letter of Credit) T/T (Wire Transfer)
Certifications
ISO 9001:2015 MTC EN 10204 3.1 RoHS Compliance
Additional Certifications
NABL Hardness Report Dimensional Inspection Spring Load Test
Mandatory Requirements
Positive Material Identification (PMI) Rockwell Hardness Check (HRC) Permanent Set Check

Available Inconel Grades & Standards

Dimensions Chart (DIN 127 Type B - Metric)

Nominal Size
(Bolt Size)		 Inner Diameter (d1)
(Min)		 Outer Diameter (d2)
(Max)		 Section Thickness (s)
(Ref)
M3 3.1 mm 6.2 mm 0.8 mm
M4 4.1 mm 7.6 mm 0.9 mm
M5 5.1 mm 9.2 mm 1.2 mm
M6 6.1 mm 11.8 mm 1.6 mm
M8 8.1 mm 14.8 mm 2.0 mm
M10 10.2 mm 18.1 mm 2.2 mm
M12 12.2 mm 21.1 mm 2.5 mm
M16 16.2 mm 27.4 mm 3.5 mm
M20 20.2 mm 33.6 mm 4.0 mm
M24 24.5 mm 40.0 mm 5.0 mm
M30 30.5 mm 48.2 mm 6.0 mm
M36 36.5 mm 58.2 mm 6.0 mm

Chemical Composition (Spring Alloy Grades)

Grade Ni (Nickel) Cr (Chromium) Ti (Titanium) Al (Aluminum) Nb (Niobium) Purpose
Inconel X-750 70.0% Min 14.0 - 17.0% 2.25 - 2.75% 0.4 - 1.0% 0.7 - 1.2% High Temp Springs
Inconel 718 50.0 - 55.0% 17.0 - 21.0% 0.65 - 1.15% 0.2 - 0.8% 4.75 - 5.5% High Strength
Inconel 625 58.0% Min 20.0 - 23.0% 0.4% Max 0.4% Max 3.15 - 4.15% Corrosion Resistance

Mechanical Properties (Spring Temper)

Grade Hardness (HRC)
(Rockwell C)		 Tensile Strength
(MPa) Min		 Spring Temper Condition
Inconel X-750 30 - 45 HRC 1100 - 1400 Solution + Age Hardened (Spring)
Inconel 718 36 - 44 HRC 1275 Aged
Inconel 625 25 - 35 HRC 827 Cold Worked (Work Hardened)

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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