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Structural Bolts
ASTM A325 and ASTM A490
ASTM A325 Type 1 Bolts Mechanicals & Performance Data  ASTM A490 Type 1 & 3 Mechanicals & Performance Data
A325 & A490 Structural Bolts image
Structural Bolts, A325 & A490    ASME 18.2.6  1996
Nominal or
Basic Product
Diameter		 E F G H R LT Y
Body Diameter Width Across Flats Width
Across
Corners		 Head Height Radius
of
Fillet		 Thread
Length		 Transi-
tion
Thread
Length
Max Min Basic Max Min Max Min Basic Max Min Max Min Ref Max
Ref
1/2 .500 .515 .482 7/8 .875 .850 1.010 .969 5/16 .323 .302 .031 .009 1.00 .19
5/8 .525 .642 .605 1-1/16 1.062 1.031 1.227 1.175 25/64 .403 .378 .062 .021 1.25 .22
3/4 .750 .768 .729 1-1/4 1.250 1.212 1.443 1.383 15/32 .483 .455 .062 .021 1.38 .25
7/8 .875 .895 .852 1-7/16 1.438 1.394 1.660 1.589 35/64 .563 .531 .062 .031 1.50 .28
1 1.000 1.022 .976 1-5/8 1.625 1.575 1.876 1.796 39/64 .627 .591 .093 .062 1.75 .31
1-1/8 1.125 1.149 1.098 1-13/16 1.812 1.756 2.093 2.002 11/16 .718 .658 .093 .062 2.00 .34
1-1/4 1.250 1.277 1.223 2 2.000 1.938 2.309 2.209 25/32 .813 .749 .093 .062 2.00 .38
1-3/8 1.375 1.404 1.345 2-3/16 2.188 2.119 2.526 2.416 27/32 .878 .810 .093 .062 2.25 .44
1-1/2 1.500 1.531 1.470 2-3/8 2.375 2.300 2.742 2.622 15/16 .974 .902 .093 .062 2.25 .44

Tolerance on Length Nominal Screw Size Nominal Screw Length
Through 6 inch Over 6 inch.
1/2 -.12 -.19
5/8 -.12 -.25
3/4 thru 1 -.19 -.25
1-1/8 thru 1-1/2 -.25 -.25


Head Marking Image Mechanical & Performance Data
for ASTM A325 Bolts Type 1		 Head Marking Image
Description A heavy hex bolt made of medium carbon steel. The bearing surface shall be flat and washer faced, and the point is chamfered.
Applications
and
Advantages		 Commonly used in structural steel joints in heavy construction.
Material Type 1 bolts shall be made from a carbon steel which conforms to the following chemical composition requirements - Carbon; 0.25 - .058%;  Manganese; 0.57% minimum;  Phosphorus: 0.048% maximum;  Sulfur; 0.058% maximum
Heat Treatment Type 1 bolts shall be heat treated by quenching in a liquid medium from above the austenitizing temperature and then tempering by reheating to a temperature of at least 800°F.
Hardness 1/2 thru 1 inch diameter, incl: Rockwell C24 - 35
1-1/8 thru 1-1/2 inch diameter, incl: Rockwell C19 - 31
Proof Load 1/2 thru 1 inch diameter, incl: 85,000 psi
1-1/8 thru 1-1/2 inch diameter, incl: 74,000 psi
Yield
Strength		 1/2 thru 1 inch diameter, incl: 92,000 psi minimum
1-1/8 thru 1-1/2 inch diameter, incl: 81,000 psi minimum
Tensile
Strength		 1/2 thru 1 inch diameter, incl: 120,000 psi minimum
1-1/8 thru 1-1/2 inch diameter, incl: 105,000 psi minimum
Plating See plating page for plating information
Note: Product standards require the manufacturer's head marking to appear on the top of all cap screws 1/4 inch diameter and larger. The X on the head image above represents a location that such marking may appear.
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Head Marking Image Mechanical & Performance Data
ASTM A490 Bolts Types 1 and 3		 Head Marking Image
Description A heavy hex bolt made of alloy steel. The bearing surface is flat and washer-faced with a chamfered point.
Applications
and
Advantages		 Used in structural steel joints in heavy construction when greater yield and tensile strengths than those of an A325 bolt are required. A Type 3 bolt is approximately twice as resistant to corrosion as a type one bolt.
Material Type 1 bolts shall be made from an alloy steel which conforms to the following chemical composition requirements -   Carbon: 0.28-.050% (for 1-1/2" diameter: 0.33-0.55%),  Phosphorus  0.045 maximum,  Sulfur 0.045%maximum.
Type 3 bolts shall be made from a corrosion resistant steel which conforms to the following chemical composition requirements - Carbon: 0.19-.055%;  Manganese: 0.37% minimum;  Phosphorus; 0.045% maximim;  Sulfur; 0.055% maximum;  Copper; .063% maximum;  Chromium; 0.42% minimum;  Nickel: 0.17% minimum;  Molybdenum: 0.14% minimum.
Heat Treatment Type 1 bolts shall be heat treated by quenching in oil from above the transformation temperature. Type 3 bolts shall be quenched in a suitable solution from above the transformation temperature. Type 1 and Type 3 bolts shall be tempered by reheating to a temperature of at least 800 degrees.
Hardness Rockwell C33 - 38
Yield Strength* 130,000 psi minimum
Tensil Strength 150,000 - 170,000 psi
Proof Load 120,000 psi
Plating See plating info page
Note: Product standards require the manufacturer's head marking to appear on the top of all cap screws 1/4 inch diameter and larger. The X on the head images above represents a location that such marking may appear.
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See also Grades 5 & 8 Cap Screws  and  Grade-2 and Stainless Cap Screws

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