ASTM A449

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ASTM A449 Quick Links

• Thread Pitch Chart • Ask the Expert • Bolt Torque Chart Scope

ASTM A449 covers headed bolts, rods, and anchor bolts in diameters ranging from 1/4" through 3" inclusive. It is a medium strength bolt manufactured from a medium carbon or alloy steel that develops its mechanical values through a heat treating process. It is intended for general engineering applications.

ASTM A449 is virtually identical in chemistry and strength to ASTM A325 and SAE J429 grade 5. However, A449 is more flexible in the sense that it covers a larger diameter range and is not restricted by a specific configuration.

TYPES

TYPE 1 Plain carbon steel, carbon boron steel, alloy steel, or alloy boron steel.

TYPE 2 Withdrawn 2003 TYPE 3 Weathering steel. MECHANICAL PROPERTIES

Size Tensile, _ksi Yield, _ksi Elong. %, _min RA %, _min

1/4 - 1 120 min 92 min 14 35

1/8 -

1-1/2 105 min 81 min 14 35

1-5/8 - 3 90 min 58 min 14 35

RECOMMENDED NUTS and WASHERS Nuts Wash ers Plain Galvanized 1/4 - 1-1/2 1-5/8 - 3 1/4 - 3 A563B

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Dimensions per ASTM F436 Bolt Size B A C Weight in Pounds Per 1000 Pieces Outside

Diameter DiameterInside

Thickne ss Min Ma_x 1/2 1-1/16 17/32 0.09₇ 0.17₇ 18 5/8 1-5/16 11/16 0.12₂ 0.17₇ 33 3/4 1-15/32 13/16 0.12₂ 0.17₇ 41 7/8 1-3/4 15/16 0.13₆ 0.17₇ 64 1 2 1-1/16 0.13₆ 0.17₇ 82 1-1/8 2-1/4 1-3/16 0.13₆ 0.17₇ 105 1-1/4 2-1/2 1-3/8 0.13₆ 0.17₇ 133 1-3/8 2-3/4 1-1/2 0.13₆ 0.17₇ 163 1-1/2 3 1-5/8 0.13₆ 0.17₇ 200 1-5/8 3-1/4 1-3/4 0.17₈ 0.28 320 1-3/4 3-3/8 1-7/8 0.17₈ 0.28 307 1-7/8 3-1/2 2 0.17₈ 0.28 360 2 3-3/4 2-1/8 0.17₈ 0.28 380 2-1/4 4 2-3/8 0.24 0.34 560

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Bolt Size B A C Weight in Pounds Per 1000 Pieces Outside

Diameter DiameterInside

Thickne ss Min Ma_x 2-1/2 4-1/2 2-5/8 0.24 0.34 720 2-3/4 5 2-7/8 0.24 0.34 920 3 5-1/2 3-1/8 0.24 0.34 1040 3-1/4 6 3-3/8 0.24 0.34 1350 3-1/2 6-1/2 3-5/8 0.24 0.34 1633 3-3/4 7 3-7/8 0.24 0.34 1880 4 7-1/2 4-1/8 0.24 0.34 2200

SAE J429 has the following requirements for a Grade 5 fastener: Medium carbon steel

Carbon content = 0.28-0.55 Phosphorus = 0.030 max Sulfur = 0.050 max

Quenched & tempered, with a minimum tempering temperature of 427 C (900 F)

Grade

Marking Specification Material and Treatment Size (In.)Nominal

Mechanical

Properties Hardness Rockwell Pro of Loa d Min (ksi ) Yield Stren gth Min (ksi) Tensil e Stren gth Min (ksi) Min Max SAE J429 Grade 1 Low or Medium Carbon Steel ¼" - 1½" 33 36 60 B70 B100 A307 Grade A ¼" - 4" - - 60 B69 B100

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A307 Grade B - -60 min 100 max B69 B95 One End Green A307 Grade C *Replaced see note 7. - 36 58 min80 max - -One End Blue F1554 Grade 36 - 36 58 min 80 max - -One End Yellow F1554 Grade 55 - 55 75 min 95 max - -SAE J429 Grade 2 ¼" - ¾" ⅞" - 1½" 55 33 57 36 74 60 B80 B70 B100 B100 A193/A320 Grade B8 AISI SS304 Stainless No Restriction s - 30 75 - B96 A193/A320

Grade B8M AISI SS316 Stainless Steel

A325

Type 1 Medium Carbon Steel, Q & T ½" - 1" 1⅛" - 1½" 85 74 92 81 120 105 C24 C19 C35 C31

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A325 Type 3 Atmospheric Corrosion Resistant Steel, Q & T SAE J429 Grade 5 Medium Carbon Steel, Q & T ¼" - 1" 1⅛" - 1½" 85 74 92 81 120 105 C25 C19 C34 C30 A449 Type 1 ¼" - 1" 1⅛" - 1½" 1⅝" - 3" 85 74 55 92 81 58 120 105 90 C25 C19 B91 C34 C30 B100 A449 Type 3 Weathering Steel, Q & T ¼" - 1" 1⅛" - 1½" 1⅝" - 3" 85 74 55 92 81 58 120 105 90 C25 C19 B91 C34 C30 B100 A193 Grade B7 Medium Carbon Alloy Steel, Q & T ¼" - 2½" 2⅝" - 4" 4⅛" - 7" -105 95 75 125 115 100 -C35 C35 C35 A354 Grade BC ¼" - 2½" 2⅝" - 4" 105 95 109 94 125 115 C26 C22 C36 C33 One End Red F1554 Grade 105 ¼" - 3" - 105 125 min 150 max - -A320 Grade L7 AISI 4140, 4142, or 4145 ¼" - 2½" - 105 125 - -A320 Grade L43 AISI 4340 ¼" - 4" - 105 125 -

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-A490 Type 1

Medium Carbon Alloy Steel, Q & T ½" - 1½" 120 130 150 min 173 max C33 C38 A490 Type 3 Atmospheric Corrosion Resistant Steel, Q & T SAE J429 Grade 8 Medium Carbon Alloy Steel, Q & T ¼" - 1½" 120 130 150 C33 C39 A354 Grade BD ¼" - 2½" 2⅝" - 4" 120 105 130 115 150 140 C33 C31 C39 C39

1. All specifications are ASTM unless otherwise noted.

2. All specifications shall be marked by the manufacturer with a unique identifier to identify the manufacturer or private label distributor, as appropriate.

3. Q & T - Quenched and Tempered.

4. Although markings are shown on hex heads, stamping is a requirement on one end of rods and studs. The exception is F1554 and A307 grade C in which stamping is a supplemental requirement while color coding is required.

5. Although markings are shown on hex heads, grade markings apply equally to products with other head configurations.

6. All Grade BD products shall be marked "BD". In addition to the "BD" marking, the product may be marked with 6 radial lines 60° apart.

7. ASTM A307 grade C has been replaced by ASTM F1554 grade 36.

bolts: metric standards

Standards for metric bolts are promulgated by the

ISO

, but adopted by individual nations.

Dimensions

A

table

of major diameters and pitches, up to 30 mm in diameter.

Thread classes of fit

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Property classes

In metric bolts, strength is described by “property classes.” A property class designation consists

of two numbers separated by a decimal point. There are nine commonly encountered: 4.6, 4.8,

5.8, 8.8, 9.8, 10.9 and 12.9. In the United States, property classes 8.8.3 and 10.9.3 also defined;

the "3" after the second decimal point indicates the fastener is made of weathering steel.

• The number before the first decimal point is approximately one-hundredth of the nominal minimum tensile strength of the bolt in newtons per square millimeter (or megapascals, which is the same thing).

• The number after the first decimal point is approximately the ratio between the minimum yield stress and the minimum tensile strength, times ten.

markings

Hex head bolts M5 and larger must have the property class marked on the head of the bolt, either

in raised or depressed lettering. Fasteners smaller than M5, and those with slotted or recessed

heads, whatever their diameter, need not be marked. Radial lines, such those used to mark SAE

grades, are never used on metric bolts.

Proper ty Class Fastener Sizes Composition Marki ng 4.6 M5-M100 4.6 4.8 M1.6-M16 4.8 5.8 M5-M24; lengths ≤ 150mm cold worked 5.8 8.8 M16-M72 Q&T 8.8

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A325M Type 1 M16-M36 A325M 8S 8.8 M16-M36 Q&T 8.8 A325M Type 2 A325M 8S A325M Type 3 M16-M36 weathering steel; Q&T A325M 8S3 9.8 M1.6-M16 Q&T 9.8 9.8 M1.6-M16 Q&T 9.8 10.9 M5-M20 Q&T 10.9 10.9 M5-M100 Q&T 10.9 A490M Type 1 M12-M36 Q&T A490M 10S 10.9 M5-M36 Q&T 10.9 A490M Type 2 M12-M36 A490M 10S A490M Type 3 M12-M36 weathering steel; Q&T A490M 10S3 12.9 M1.6-M100 Q&T 12.9

Key: Q&T= quenched and tempered;

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Approximately Equivalent Grades ISO

class Inch-based systems

4.6 SAE J429 grade 1 ASTM A 307, grade A 6.8 SAE grade 2 5.8 SAE J429, grade 2 6.8 SAE grade 2 8.8 SAE J429, grade 5

ASTM A 325, types 1 & 2 (M16 and larger)

ASTM A 449

8.8.3 ASTM A325, type 3 (weathering steels) 9.8 9% stronger than SAE J429, grade 5 ASTM A 449 10.9 SAE J429, grade 8 ASTM A 354, grade BD 10.9. 3 ASTM A 490 12.9 ASTM A 574