This specification covers two types of quenched and tempered,
steel, metric heavy hex structural bolts having a minimum tensile
strength of 830 MPa (Note 1).
Formerly under the jurisdiction of Committee F16 on Fasteners, this
specification was withdrawn in May 2016 and replaced by
Specification F3125/F3125M for High Strength Structural Bolts,
Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi
(1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions.
Specification F3125/F3125M supersedes and replaces specifications;
A325, A325M, A490, A490M, F1852 and F2280. The unified
Specification F3125/F3125M corrects known inconsistencies in the
original documents and the combination will assure that
requirements of the products covered under the original standards
stay aligned.
ASTM Standards
A153/A153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel
Hardware
A563M Specification for Carbon and Alloy Steel Nuts (Metric)
A751 Test Methods, Practices, and Terminology for Chemical Analysis of
Steel Products
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron
and Steel
D3951 Practice for Commercial Packaging
F436M Specification for Hardened Steel Washers (Metric)
F606M Test Methods for Determining the Mechanical Properties of
Externally and Internally Threaded Fasteners, Washers, and Rivets
(Metric)
F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and
Studs, Inch and Metric Series
F959M Specification for Compressible-Washer-Type Direct Tension
Indicators for Use With Structural Fasteners (Metric)
F1136M Specification for Zinc/Aluminum Corrosion Protective Coatings for
Fasteners (Metric)
F1470 Practice for Fastener Sampling for Specified Mechanical Properties
and Performance Inspection
F1789 Terminology for F16 Mechanical Fasteners
G101 Guide for Estimating the Atmospheric Corrosion Resistance of
Low-Alloy Steels
ASME Standards
B 1.13M Metric Screw Threads
B 18.18.3M Inspection and Quality Assurance for Special Purpose
Fasteners
B 18.2.3.7M Metric Heavy Hex Structural Bolts
B 18.24 Part Identifying Number (PIN) Code System Standard for B18
Fastener Products
Screw Thread
d | |
| ds | max | | min | | s | Nominal Size | | max | | min | | e | max | | min | | k | Nominal Size | | max | | min | | b | Ref. |
| | 0.515 | 0.642 | 0.768 | 0.895 | 1.022 | 1.149 | 1.277 | 1.404 | 1.531 | | 0.482 | 0.605 | 0.729 | 0.852 | 0.976 | 1.098 | 1.223 | 1.345 | 1.47 | | 7/8 | 1-1/16 | 1-1/4 | 1-7/16 | 1-5/8 | 1-13/16 | 2 | 2-3/16 | 2-3/8 | | 0.875 | 1.062 | 1.25 | 1.438 | 1.625 | 1.812 | 2 | 2.188 | 2.375 | | 0.85 | 1.031 | 1.212 | 1.394 | 1.575 | 1.756 | 1.938 | 2.119 | 2.3 | | 1.01 | 1.227 | 1.443 | 1.66 | 1.876 | 2.093 | 2.309 | 2.526 | 2.742 | | 0.969 | 1.175 | 1.383 | 1.589 | 1.796 | 2.002 | 2.209 | 2.416 | 2.622 | | 5/16 | 25/64 | 15/32 | 35/64 | 39/64 | 11/16 | 25/32 | 27/32 | 15/16 | | 0.323 | 0.403 | 0.483 | 0.563 | 0.627 | 0.718 | 0.813 | 0.878 | 0.974 | | 0.302 | 0.378 | 0.455 | 0.531 | 0.591 | 0.658 | 0.749 | 0.81 | 0.902 | | 1 | 1.25 | 1.38 | 1.5 | 1.75 | 2 | 2 | 2.25 | 2.25 |
|
Note: In 2016, ASTM A325 was officially withdrawn and replaced by
ASTM F3125, in which A325 now becomes a grade under the F3125 specification.
The F3125 specification is a consolidation and replacement of six
ASTM standards, including; A325, A325M, A490, A490M, F1852, and F2280. We are choosing to keep this technical
information about the now obsolete A325 specification on our
website for reference and informational purposes only.
Prior to its withdrawl in 2016, the ASTM A325 specification covered
high strength heavy hex structural bolts from 1/2″ diameter through
1-1/2″ diameter. These bolts are intended for use in structural
connections and therefore have shorter thread lengths than standard
hex bolts. Refer to the Structural Bolts page of our site for thread lengths and other related dimensions.
This specification is applicable to heavy hex structural bolts
only. For bolts of other configurations and thread lengths with
similar mechanical properties, see Specification A449.
Bolts for general applications, including anchor bolts, are covered
by Specification A449. Also refer to Specification A449 for
quenched and tempered steel bolts and studs with diameters greater
than 1-1/2″ but with similar mechanical properties.
A325 Types
| TYPE 1 | Medium carbon, carbon boron, or medium carbon alloy steel. |
| TYPE 2 | Withdrawn November 1991. |
| TYPE 3 | Weathering steel. |
|
| T | Fully threaded A325. (Restricted to 4 times the diameter in length) |
| M | Metric A325. |
A325 Connection Types
| SC | Slip critical connection. |
| N | Bearing type connection with threads included in the shear plane. |
| X | Bearing-type connection with threads excluded from the shear plane. |
A325 Mechanical Properties
| Size | Tensile, ksi | Yield, ksi | Elong. %, min | RA %, min |
| 1⁄2 - 1 | 120 min | 92 min | 14 | 35 |
| 11⁄8 - 11⁄2 | 105 min | 81 min | 14 | 35 |
A325 Type 1 Chemical Properties
| Heat Analysis | 120ksi, % | 150ksi, % |
| Carbon | 0.30 – 0.52 | 0.30 – 0.48* |
| Manganese | 0.60 min | 0.60 min |
| Phosphorus | 0.035 max | 0.035 max |
| Sulfur | 0.040 max | 0.040 max |
| Silicon | 0.15 – 0.30 | - |
| Boron | 0.003 max | 0.003 max |
| Copper | - | - |
| Nickel | - | - |
| Chromium | - | - |
| Molybdenum | - | - |
| *Carbon 0.35-0.53% for 1-1/2” A490/150ksi bolts |
A325 Type 3 Chemical Properties
| Heat Analysis | 120ksi, % Comp A | 120ksi, % Comp B | 120ksi, % Index | 150ksi, % Index |
| Carbon | 0.33 – 0.40 | 0.38 – 0.48 | 0.30 – 0.52 | 0.30 – 0.53 |
| Manganese | 0.90 – 1.20 | 0.70 – 0.90 | 0.60 min | 0.60 min |
| Phosphorus | 0.035 max | 0.035 max | 0.035 max | 0.035 max |
| Sulfur | 0.040 max | 0.040 max | 0.040 max | 0.040 max |
| Silicon | 0.15 – 0.30 | 0.30 – 0.50 | | |
| Copper | 0.25 – 0.45 | 0.20 – 0.40 | 0.20 – 0.60 | 0.20 – 0.60 |
| Nickel | 0.25 – 0.45 | 0.50 – 0.80 | 0.20 min* | 0.20 min* |
| Chromium | 0.45 – 0.65 | 0.50 – 0.80 | 0.20 min | 0.20 min |
| Molybdenum | | 0.06 max | 0.10 min* | 0.10 min* |
| *Either Nickel or Molybdenum must be present in the amount
specified *Corrosion Index based on ASTM Guide G101 |
A325 Recommended Hardware
Process flow
Cold forging
Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment ➨ Finish ➨ Packing
Hot forging
Cutting material ➨ hot forging ➨ turning ➨ shrink diameter(half thread) ➨thread rolling ➨ make heat treatment ➨ Finish ➨ Packing
Product Grade
Grade 8S Grade 10s
Materials and Chemical compstition
1035
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.34 | 0.13 | 0.73 | 0.012 | 0.002 | 0.02 | 0.01 | 0.02 |
1045
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.45 | 0.23 | 0.58 | 0.014 | 0.006 | 0.057 | 0.008 | 0.016 |
40CR
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.4 | 0.21 | 0.54 | 0.015 | 0.008 | 0.95 | 0.02 | 0.02 |
Finish
PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON
PACKING
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20-25KG/CTN,36CTNS/PALLET
20-30KG/BAGS,36BAGS/PALLET
ONE TON/BOXES
50KG/ IRON DRUM,12 IRON DRUMS/PALLET
QBH SMALL PACKING
Packing in small boxes according to customer’s requirements
Packing in plastic bag according to customer’s requirements
QBH PALLET TYPE
SOLID WOOD FUMIGATION PALLET
EURO Pallet
THREE SPLINT PALLET
WOODEN BOX
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General:
In brief Type 3 grade A325 bolts shall be marked “A325” to distinguish them from standard grade A325s. Likewise Grade A490 bolts are available in diameters from 1/2 to 1-1/2 inch diameters with a
minimum tensile strength of 150,000 PSI for all diameters, and are
offered in two types.
In Fact ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It
defines mechanical properties for bolts that range from 1⁄2 to 1 1⁄2 inches (13 to 38 mm) in diameter.
In accordance with ASTM A325, all threaded components of the fastener assembly must be galvanized by the same process and the supplier’s option is limited to one
process per item with no mixed processes in a lot.
This Specification deals principally with two strength grades of
high-strength
bolts, ASTM A325 and A490, and with their design, installation and
inspection in
structural steel joints. Equivalent fasteners, however, such as
ASTM F1852
(equivalent to ASTM A325) twist-off-type tension-control bolt
assemblies, are
also covered. These provisions may not be relied upon for
high-strength fasteners
of other chemical composition, mechanical properties, or size.
These provisions do
not apply when material other than steel is included in the grip;
nor are they
applicable to anchor rods.
This Specification relates only to the performance of fasteners in
structural
steel joints and those few aspects of the connected material that
affect this
performance. Many other aspects of connection design and
fabrication are of equal
importance and must not be overlooked. For more general information
on design
and issues relating to high-strength bolting and the connected
material, refer to
current steel design textbooks and the Guide to Design Criteria for
Bolted and
Riveted Joints, 2 nd Edition (Kulak et al., 1987).
