Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 3063:1994 is the Indian Standard (BIS) for washers for high strength structural bolting. This specification outlines the requirements for washers used in high strength structural bolting assemblies. It covers dimensions, material composition, hardness properties, and surface finish to ensure reliable clamping forces and safe load distribution in friction-grip connections.
Covers requirements for steel washers for use in high strength structural bolting.
Overview
Status
Current
Usage level
Frequently Used
Domain
Structural Engineering — Fasteners, Bolts and Anchors
Standard Specification for Hardened Steel Washers Inch and Metric Dimensions
Specifies hardened steel washers for use with high-strength bolts (e.g., A325M, A490M).
EN 14399-5:2015CEN (European Committee for Standardization)
HighCurrent
High-strength structural bolting assemblies for preloading - Part 5: Plain washers
Covers plain washers as part of a pre-loadable high-strength structural bolting system (System HR or HV).
EN 14399-6:2015CEN (European Committee for Standardization)
MediumCurrent
High-strength structural bolting assemblies for preloading - Part 6: Plain chamfered washers
Specifies chamfered washers for HRC/HRV systems, an alternative geometry not covered by IS 3063.
ISO 7415:1984ISO (International Organization for Standardization)
MediumWithdrawn
Plain washers for high-strength structural bolting, hardened and tempered
Defined hardened and tempered washers, but is outdated and uses different dimensional series than IS 3063.
Key Differences
≠IS 3063:1994 is a standalone standard for washers, whereas the modern European equivalent, EN 14399, treats washers as an integral part of a tested bolting assembly (bolt + nut + washer).
≠ASTM F436 explicitly covers circular, clipped, and beveled washer types, while IS 3063 only details circular flat washers.
≠Marking requirements differ significantly. IS 3063 requires the property class ('8' or '10'), while ASTM F436 requires the manufacturer's symbol and EN 14399 requires the system type ('HR') and manufacturer's ID.
≠The international standards (ASTM F436, EN 14399) contain more detailed and specific requirements for coatings (e.g., hot-dip galvanizing) and subsequent testing for hydrogen embrittlement risk.
≠IS 3063 and ASTM F436 generally specify larger outside diameters ('wide series') compared to the washers specified in the withdrawn ISO 7415 or EN 14399-5 ('normal series').
Key Similarities
≈All standards specify washers made from medium carbon steel that is quenched and tempered to achieve high hardness and strength.
≈The core purpose is identical: to be used with high-strength structural bolts to distribute the clamping force over a larger area and prevent galling under the nut or bolt head.
≈Hardness is a critical specified property in all standards, with very similar ranges (typically 35-45 HRC or equivalent) to ensure the washer does not deform under the high tensile load of the bolt.
≈All standards provide detailed tables of dimensions (ID, OD, thickness) with specific tolerances for each nominal bolt size.
Parameter Comparison
Parameter
IS Value
International
Source
Hardness (for 8.8 bolts)
35 to 45 HRC
38 to 45 HRC
ASTM F436/F436M-19
Outside Diameter (for M20 bolt)
40 mm (nominal)
39 mm (nominal, for HV system)
EN 14399-5:2015
Thickness (for M24 bolt)
5.0 mm (+0.7, -0.0 mm)
4.37 mm to 5.23 mm
ASTM F436M-19
Inside Diameter (for M20 bolt)
22.0 mm (+0.8, -0.0 mm)
22.00 mm (+0.52, -0.00 mm)
EN 14399-5:2015
Chamfer Requirement
Not explicitly required or defined.
Specified in a separate standard (EN 14399-6) for use on the nut face side.
EN 14399-6:2015
Material Specification
Performance-based; material must meet mechanical properties after heat treatment.
Specifies chemical composition limits for elements like Carbon, Manganese, Phosphorus, etc.
ASTM F436/F436M-19
⚠ Verify details from original standards before use
Key Values3
Quick Reference Values
Hardness Range35 to 45 HRC (Typical for hardened washers)
Hole ToleranceMedium (H13/H14)
Nominal Size RangeStandard sizes matching M12 to M36 bolts