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IS 8081 : 1976slotted sections

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EN 10162 · EN 15512 · RMI/ANSI MH16.1
CurrentSpecializedSpecificationBIMStructural Engineering · Structural Engineering and Structural Sections
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OverviewValues6InternationalTablesFAQ4Related

IS 8081:1976 is the Indian Standard (BIS) for slotted sections. This Indian Standard specifies the dimensions, mass, sectional properties, and manufacturing tolerances for hot-rolled steel slotted angles and slotted channels. These sections are specifically designed for easy assembly into frameworks like storage racks, shelving units, and other light-duty structural applications.

slotted sections

Overview

Status
Current
Usage level
Specialized
Domain
Structural Engineering — Structural Engineering and Structural Sections
Type
Specification
Amendments
Reaffirmed 2003, 2013
International equivalents
EN 10162:2003 · European Committee for Standardization (CEN), EuropeEN 15512:2020 · European Committee for Standardization (CEN), EuropeRMI/ANSI MH16.1-2023 · Rack Manufacturers Institute / ANSI, USA
Typically used with
IS 226IS 1852IS 2062
Also on InfraLens for IS 8081
6Key values4Tables4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! The material standard IS 226 mentioned in this code is obsolete. Use equivalent grades from the current standard IS 2062, such as E250, for material specification.
! The designation is crucial for ordering: 'SA' denotes Slotted Angle and 'SC' denotes Slotted Channel, followed by dimensions (e.g., SA 6040 for a 60x40 mm angle).
! These sections are intended for bolted connections using the pre-formed slots; welding is generally not the primary connection method.
Frequently referenced clauses
Cl. 2MaterialCl. 3DesignationCl. 5Dimensions and Sectional PropertiesCl. 6TolerancesCl. 7Marking and Packing
Pulled from IS 8081:1976. Browse the full clause & table index below in Tables & Referenced Sections.
Updates & Amendments1 amendment
2003Reaffirmed 2003, 2013
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
steelstructural steelhot-rolled sections

International Equivalents

Similar International Standards
BS 4345:1968British Standards Institution (BSI), UK
HighWithdrawn
Specification for slotted angles (metric and inch units)
Almost identical scope, providing dimensions and properties for standardized slotted angle sections.
EN 10162:2003European Committee for Standardization (CEN), Europe
MediumCurrent
Cold rolled steel sections - Technical delivery conditions - Dimensional and cross-sectional tolerances
Covers manufacturing tolerances for cold-formed steel sections, which is the basis for slotted sections, but does not standardize slot patterns.
EN 15512:2020European Committee for Standardization (CEN), Europe
LowCurrent
Steel static storage systems - Adjustable pallet racking systems - Principles for structural design
A modern design/application standard for racking, a primary use-case for IS 8081 sections, focusing on performance rather than component dimensions.
RMI/ANSI MH16.1-2023Rack Manufacturers Institute / ANSI, USA
LowCurrent
Specification for the Design, Testing and Utilization of Industrial Steel Storage Racks
The primary US design specification for storage racks; it does not standardize section dimensions but refers to AISI S100 for design rules.
Key Differences
≠IS 8081 is prescriptive, defining the exact dimensions and properties of a limited set of slotted sections. Modern standards like EN 15512 are performance-based, defining design rules and testing requirements, allowing manufacturers flexibility in section design.
≠The Indian standard specifies a very limited range of material grades based on the older IS 1079. International standards reference a much wider array of modern, high-strength, cold-formable steel grades (e.g., S235, S355 in the EN 10025 series).
≠The design philosophy implied by IS 8081 is based on working stress design, contemporary to its publication. Modern equivalents like EN 15512 are exclusively based on Limit State Design (LSD) principles, incorporating stability checks specific to thin-walled sections.
≠IS 8081 combines material, dimensional, and sectional property data into one document. The modern international approach segregates these into separate standards for material (e.g., EN 10025), manufacturing tolerances (e.g., EN 10162), and structural design (e.g., EN 1993-1-3).
Key Similarities
≈The fundamental purpose is the same: to provide standardized, versatile, bolted steel sections for light construction, shelving, racking, and general framing.
≈The basic profile shapes, namely equal/unequal angles and channels, are common to IS 8081 and the components used under modern racking standards.
≈Both IS 8081 and its manufacturing equivalent, EN 10162, place a strong emphasis on controlling dimensional tolerances such as thickness, leg length, and squareness to ensure predictable performance and interchangeability.
≈All standards are based on sections formed from hot-rolled or cold-rolled steel strips/sheets, specifying requirements for the base material's mechanical properties like yield and tensile strength.
Parameter Comparison
ParameterIS ValueInternationalSource
Base Material Yield Strength (Typical)≥ 255 MPa (for Grade St 42-S in IS 1079:1973)≥ 235 MPa (for Grade S235JR, t ≤ 16mm)EN 10025-2:2019
Thickness Tolerance (on 2.0mm section)± 0.20 mm± 0.18 mm (based on input strip per EN 10051)EN 10162:2003
Angle Leg Length Tolerance (on 40mm leg)± 1.0 mm± 1.0 mm (for leg length > 30 to 50 mm)EN 10162:2003
Angle Squareness Tolerance± 1.5°± 1.5° (Normal class)EN 10162:2003
Straightness Tolerance (deviation over length L)≤ 0.25% of length≤ 0.3% of length (Normal class)EN 10162:2003
⚠ Verify details from original standards before use

Key Values6

Quick Reference Values
Nominal mass of Slotted Angle SA 4040 x 2.51.47 kg/m
Nominal mass of Slotted Channel SC 8040 x 2.52.41 kg/m
Standard length of sections4 m, 5 m, 6 m
Length tolerance for standard lengths+50 mm, -0 mm
Tolerance on thickness for t ≤ 3 mm+0.3 mm, -0.2 mm
Tolerance on leg length (A or B) for A, B ≤ 50 mm±1.0 mm

Tables & Referenced Sections

Key Tables
Table 1 - Dimensions, Mass and Sectional Properties of Slotted Angles
Table 2 - Dimensions, Mass and Sectional Properties of Slotted Channels
Table 3 - Tolerances on Dimensions of Slotted Angles
Table 4 - Tolerances on Dimensions of Slotted Channels
Key Clauses
Clause 2 - Material
Clause 3 - Designation
Clause 5 - Dimensions and Sectional Properties
Clause 6 - Tolerances
Clause 7 - Marking and Packing

Related Resources on InfraLens

Cross-Referenced Codes
IS 226:1975Structural Steel (Standard Quality)
→
IS 1852:1985Rolling and Cutting Tolerances for Hot Rolled...
→
IS 2062:2011Hot Rolled Medium and High Tensile Structural...
→

Frequently Asked Questions4

What is the material grade specified for slotted sections?+
The code specifies steel conforming to IS 226, which is now obsolete. The current equivalent is IS 2062, typically Grade E250 (Fe 410W).
What are the standard sizes for slotted angles?+
Common sizes include 40x40, 60x40, 60x60, and 80x80 mm, with thicknesses ranging from 2.5 mm to 3.15 mm (Table 1).
What is the designation for a slotted channel 80mm deep and 40mm wide?+
The designation is SC 8040 (Clause 3.2).
What are the standard supply lengths?+
Standard lengths are 4m, 5m, and 6m, with a tolerance of +50 mm, -0 mm (Clause 6.1).

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