ASTM A490 Bolts Specification

Carbon Steel, Alloy Steel And Weatherng Steel Structural Bolts, Hex Cap Screws and Studs Heat Treated to 150 ksi Minimum Tensile Strength

Related Specifications of ASTM A490 Bolting

F2482 A563 A563M A242/A242M A588/A588M A606/A606M A709/A709M

ASTM A490 Scope

Type	Description
Type 1	Medium carbon alloy steel
Type 2	Withdrawn in 2002
Type 3	Weathering steel

ASTM A490 Chemical Requirements

ASTM A490 Chemical Requirements for Type 1 Bolts

Element	Alloy Steel		Alloy Steel with Boron Addition
Element	Heat Analysis, %	Product Analysis, %	Heat Analysis, %	Product Analysis, %
C For sizes through 13⁄8 in.	0.30-0.48	0.28-0.50	0.30-0.48	0.28-0.50
C For size 11⁄2 in.	0.35-0.53	0.33-0.55	0.35-0.53	0.33-0.55
P	0.040	0.045	0.040	0.045
M	0.60	0.57	0.60	0.57
S, max	0.040	0.045	0.040	0.045
B	. . .	. . .	0.0005-0.003	0.0005-0.003
Alloying Elements	^A	^A	^A	^A

ASTM A490 Chemical Requirements for Type 3 Bolts

Element	Heat Analysis, %	Product Analysis, %
C for Sizes 0.75 in. and smaller	0.20-0.53	0.19-0.55
C for Sizes larger than 0.75 in.	0.30-0.53	0.28-0.55
M, min	0.40	0.37
P, max	0.035	0.040
S, max	0.040	0.045
Cu	0.20-0.60	0.17-0.63
Cr, min	0.45	0.42
Ni, min or	0.20	0.17
Mo, min	0.15	0.14

ASTM A490 Mechinical Requirements

ASTM A490 Hardness Requirements for Bolts 1⁄2 to 11⁄2 in. Nominal Size

Size, in.	Nominal Length, in.	Brinell		Rockwell C
Size, in.	Nominal Length, in.	min	max	min	max
1⁄2 to 1, incl.	Less than 2D 2D and longer	311	352	33	38
1⁄2 to 1, incl.	Less than 2D 2D and longer	. . .	352	. . .	38
Over 1 to 11⁄2, incl	Less than 3D 3D and longer	311	352	333	38
Over 1 to 11⁄2, incl	Less than 3D 3D and longer	. . .	352	. . .	38

ASTM A490 Tensile Load Requirements for Bolts Tested Full-Size

Bolt Size, Threads per Inch, and Series Designation

Stress Area,^A in.²

Tensile Load,^B lbf

Proof Load,Length Measurement Method

Alternative Proof Load,^B lbf Yield Strength Method

min

max

1⁄2 -13 UNC

0.142

21 300

24 600

17 050

18 500

5⁄8-11 UNC

0.226

33 900

39 100

27 100

29 400

3⁄4-10 UNC

0.334

50 100

57 800

40 100

43 400

7⁄8-9 UNC

0.462

69 300

79 950

55 450

60 100

1-8 UNC

0.606

90 900

104 850

72 700

78 800

11⁄8 -7 UNC

0.763

114 450

132,000

91 550

99 200

11⁄4 -7 UNC

0.969

145 350

167 650

116 300

126,000

13⁄8 -6 UNC

1.155

173 250

199 850

138 600

150 200

11⁄2 -6 UNC

1.405

210 750

243 100

168 600

182 600

A The stress area is calculated as follows:
- As = 0.7854 [D − (0.9743/n)] ²
where:
- As = stress area, in.²
- D = nominal bolt size, and
- n = threads per inch.
^B Loads tabulated and loads to be used for tests of full-size bolts larger than 1 1⁄2 in. in diameter are based on the following:

Bolt Size, Threads per Inch, and Series Designation	Tensile Load,^B lbf		Proof Load,Length Measurement Method	Alternative Proof Load,^B lbf Yield Strength Method
Bolt Size, Threads per Inch, and Series Designation	min	max	Proof Load,Length Measurement Method	Alternative Proof Load,^B lbf Yield Strength Method
1⁄2 to 1 1⁄2 in., incl	150,000 psi	173,000 psi	120,000 psi	130,000 psi

ASTM A490 Tensile Strength Requirements for Specimens Machined from Bolts

Bolt Size, Threads per Inch, and Series Designation	Tensile Load,B lbf		Yield Strength (0.2 % offset), min, psi	Elongation in 2 in. or 50 mm, min, %	Reduction of Area, min, %
Bolt Size, Threads per Inch, and Series Designation	min	max	Yield Strength (0.2 % offset), min, psi	Elongation in 2 in. or 50 mm, min, %	Reduction of Area, min, %
1⁄2 to 1 1⁄2 in., incl	150,000 psi	173,000 psi	130,000 psi	14	40

ASTM A490 Bolting Surface Treatment Specifications

Renowned Brands

PTFE MOLYKOTE XYLAN 1014 XYLAN 1424 XYLAN 1070 Ceramic XYLAR 101 XYLAR 2 Dacromet

ASTM A490 Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

ASME Dimensional Standards

ASTM A490 Bolting Certifications

EN 10204 3.1
EN 10204 3.2
PED 2014/68/EC
MERKBLATT AD 2000 W2/W7/W10
API 20 E BSL 1/ BSL 2
NACE MR 0175
NACE MR 0103