ASTM A449 Specifications

Technical Menu Posted on July 1st, 2015 by vapro

This ASTM A449 specification covers quenched and tempered, medium strength hex cap screws, headed bolts, rods and nuts from 1/4” to 3” in diameter. ASTM A449 products are manufactured from medium carbon or alloy steel and are heat treated to acheive their required mechanical properties. ASTM A449 is very similar to ASTM A325 in chemistry and strength but covers a wider range of diameters.

A449 Fasteners are designated by type denoting chemical composition as follows:

TYPE DESCRIPTION
TYPE 1 Plain Carbon Steel, Carbon Boron Steel, Alloy Steel, Alloy Boron Steel
TYPE 2 **Withdrawn in 2003**
TYPE 3 Weathering Steel

A449 Chemical Properties

Type 1 Bolts
Element Carbon Steel Carbon Boron Steel Alloy Steel Alloy Boron Steel
Carbon 0.30 – 0.52% 0.30 – 0.52% 0.30 – 0.52% 0.30 – 0.52%
Manganese, min 0.60% 0.60% 0.60% 0.60%
Phosphorus, max 0.04% 0.04% 0.04% 0.04%
Sulfur, max 0.05% 0.05% 0.04% 0.04%
Silicon 0.15-0.30% 0.10 – 0.30% 0.15 – 0.35% 0.15 – 0.35%
Boron 0.0005 – 0.003% 0.0005 – 0.003%

Type 3 Bolts
Carbon 0.33 – 0.40% 0.38 – 0.48% 0.15 – 0.25% 0.15 – 0.25% 0.20 – 0.25% 0.20 – 0.25%
Manganese 0.90 – 1.20% 0.70 – 0.90% 0.80 – 1.35% 0.40 – 1.20% 0.60 – 1.00% 0.90 – 1.20%
Phosphorus 0.035% max 0.06 – 0.12% 0.035% max 0.035% max 0.04% 0.04%
Sulfur, max 0.04% 0.04% 0.04% 0.04% 0.04% 0.04%
Silicon 0.15 – 0.35% 0.30 – 0.50% 0.15 – 0.35% 0.25 – 0.50% 0.15 – 0.35% 0.15 – 0.35%
Copper 0.25 – 0.45% 0.20 – 0.40% 0.20 – 0.50% 0.30 – 0.50% 0.30 – 0.60% 0.20 – 0.40%
Nickel 0.25 – 0.45% 0.50 – 0.80% 0.25 – 0.50% 0.50 – 0.80% 0.30 – 0.60% 0.20 – 0.40%
Chromium 0.45 – 0.65% 0.50 – 0.75% 0.30 – 0.50% 0.50 – 1.00% 0.60 – 0.90% 0.45 – 0.65%
Vanadium 0.020% min
Molybdenum 0.06% max 0.10% max
Titanium 0.05% max

A449 Mechanical Requirements

Size Tensile, ksi Yield, ksi Elong. %, min RA %, min
1/4” – 1” 120 min 92 min 14 35
1-1/8” – 1-1/2” 105 min 81 min 14 35
1-5/8” – 3” 90 min 58 min 14 35

Related: ASTM A449 Specifications on ASTM.org

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