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IS 1732:1989 is the Indian Standard (BIS) for dimensions for round and square steel bars for structural and general engineering purposes. This standard covers the dimensions, cross-sectional areas, and mass per unit length of hot-rolled round and square steel bars used for structural and general engineering purposes. It is a fundamental reference for structural detailing, quantity estimation, and fabrication.
Specifies dimensions for hot rolled round and square steel bars for structural and general engineering purposes.
EN 10060: Hot rolled round steel bars for general purposes - Dimensions and tolerances on shape and dimensions; EN 10059: Hot rolled square steel bars for general purposes - Dimensions and tolerances on shape and dimensions
Covers dimensions and tolerances for hot-rolled round (EN 10060) and square (EN 10059) bars, closely mirroring the scope of IS 1732.
ASTM A6/A6M-23ASTM International (US)
MediumCurrent
Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
A broader standard covering general requirements for many structural steel products, including dimensional and mass tolerances for bars.
JIS G 3191:2020JSA (Japan)
HighCurrent
Dimensions, mass and permissible variations of hot rolled steel bars and bar in coil
Specifies dimensions, mass, and tolerances for hot-rolled steel bars, directly corresponding to the scope of IS 1732.
ISO 1035-1:1980 / ISO 1035-2:1980 / ISO 1035-4:1982ISO (International)
HighCurrent
Hot-rolled steel bars — Part 1: Dimensions of round bars; Part 2: Dimensions of square bars; Part 4: Tolerances
This set of standards collectively covers the dimensions (Parts 1 & 2) and tolerances (Part 4) for round and square bars, though now somewhat dated.
Key Differences
≠IS 1732 specifies mass tolerance for both individual bars (+10% / -8%) and batches (±5%), whereas EN 10060/10059 state that mass deviation shall be agreed upon at the time of order.
≠The specification for straightness tolerance differs; IS 1732 defines a deviation in mm per metre length (e.g., 6 mm/m), while EN 10060 specifies it as a percentage of the total length (e.g., 0.4% of L), which is generally a stricter requirement.
≠IS 1732 covers both round and square bars in a single document, while European standards separate them into two documents: EN 10060 for round bars and EN 10059 for square bars.
≠The standard range of nominal sizes for square bars differs. IS 1732 covers 5 mm to 125 mm, while EN 10059 covers 8 mm to 150 mm.
Key Similarities
≈The fundamental scope of specifying dimensions, tolerances, and nominal mass for hot-rolled round and square steel bars for general engineering is identical across the standards.
≈Many dimensional tolerances for common bar sizes are identical between IS 1732 and the EN standards (EN 10060/10059), indicating strong technical alignment.
≈The method for specifying out-of-round or out-of-square tolerance is the same, defined as a maximum of 75% of the total dimensional tolerance range.
≈All standards use a standard density of steel, 7.85 g/cm³ (or its imperial equivalent), as the basis for calculating the nominal mass per unit length of the bars.
Parameter Comparison
Parameter
IS Value
International
Source
Nominal Diameter Range (Round Bars)
5 mm to 250 mm
5 mm to 250 mm
EN 10060:2003
Nominal Size Range (Square Bars)
5 mm to 125 mm
8 mm to 150 mm
EN 10059:2003
Dimensional Tolerance (40 mm Round Bar)
±0.50 mm (Normal Class)
±0.5 mm
EN 10060:2003
Dimensional Tolerance (40 mm Square Bar)
±0.60 mm (Normal Class)
±0.6 mm
EN 10059:2003
Out-of-Round Tolerance
Shall not exceed 75% of the total dimensional tolerance.
Shall not exceed 75% of the specified tolerance on diameter.
EN 10060:2003
Straightness Tolerance (Default)
Max 6 mm deviation per 1 metre length.
Max 0.25% of length L (for bars > 25mm), which equals 2.5 mm per 1 metre length.
EN 10060:2003
Mass Tolerance (Batch)
±5% for a batch of not less than 10 tonnes.
For lots of bars, permissible variation from theoretical mass shall not be more than 2.5% underweight.
ASTM A6/A6M-23
Standard Density of Steel
7.85 g/cm³
490 lb/ft³ (equivalent to 7.85 g/cm³)
ASTM A6/A6M-23
⚠ Verify details from original standards before use
Key Values3
Quick Reference Values
Density of steel assumed7.85 g/cm³ (7850 kg/m³)
Nominal diameter range (Round bars)5 mm to 200 mm
Nominal side range (Square bars)5 mm to 100 mm
Key Formulas
Mass per meter of round bar = (d² / 162.28) kg/m (derived from 7850 kg/m³)
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions, Sectional Areas and Mass of Round Bars
Table 2 - Dimensions, Sectional Areas and Mass of Square Bars