Heavy Hex Bolts – Supplier of Quality Forged Fittings-Flanges

ASTM A325 Bolts Order

Z0065c — Mon, 04 Aug 2025 02:00:00 +0000

This order came from a long-standing American customer with whom we’ve collaborated over ten times. We’ve maintained close contact, and the ASTM A325 bolts in this order are one of our flagship products. Therefore, we quickly provided a quote, and after finalizing the product details, the customer quickly placed the order.

ZIZI specialize in selling all kinds of stainless steel pipe fittings, tubes, plates, flanges, bolts and nuts, our products are widely used in many fields, from precision machinery manufacturing to warm home decoration and even high-end aerospace industry. We have become a trusted choice for many industries due to our superior product quality and wide range of applications. Not only do we offer a wide range of products, but we can also provide customized processing services according to the specific needs of our customers, ensuring that your expectations are accurately met every time we work together. With advanced production equipment and strict quality management system, we are committed to providing high-quality piping solutions to customers worldwide. Welcome to contact us.

Products Lists

No	Description of Goods	Quantity	Units
1	BOLT, HEAVY HEX, 3/8″ UNC x 1 1/2″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	90	EA
2	BOLT, HEAVY HEX, 3/8″ UNC x 1 1/4″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	20	EA
3	BOLT, HEAVY HEX, 3/8″ UNC x 2″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	60	EA
4	BOLT, HEAVY HEX, 3/8″ UNC x 3/4″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	20	EA

Inspection of ASTM A325 Bolts

Surface defects: Inspect the bolt surface for cracks, burrs, scratches, rust, or peeling of the coating. These defects can affect the bolt’s strength and corrosion resistance.

Head Markings: Inspect the bolt head to ensure that manufacturer information and strength grade are clearly and completely marked. This is a critical basis for assessing bolt quality and performance.

Thread Integrity: Inspect the threads for damage, defects, or deformation to ensure smooth nut engagement.

Length: Use calipers or a micrometer to measure the effective length of the bolt to ensure it meets design requirements.

Thread tolerance: Use a thread gauge to check the precision and tolerance of the threads to ensure proper fit with the nut.

Head dimensions: Measure the diagonal dimensions and height of the bolt head to ensure the wrench can apply force correctly.

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.

Connection type of ASTM A325 Bolts

SC	Slip critical connection.
X	Bearing-type connection with threads excluded from the shear plane.
N	Bearing type connection with threads included in the shear plane.

ASTM A325 Bolt Chemical Composition

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%
Alloying Elements			*	*

ASTM A325 Bolt 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

Features

High strength: Depending on the bolt diameter, the minimum tensile strength can reach 120 ksi (for bolts with a diameter ≤ 1 inch) or 105 ksi (for bolts with a diameter > 1 inch to 1.5 inches). This enables A325 bolts to withstand significant tensile and shear loads.

Heavy-duty hex head: A325 bolts feature a heavy-duty hex head design, with a larger and thicker head compared to standard hex bolts. This design provides a larger bearing area, effectively distributing clamping force across the connected steel components.

Short thread length: Unlike standard bolts, the threaded portion of A325 bolts is typically shorter. This is to ensure that in shear connections, the bolt’s shank (non-threaded portion) can better withstand shear forces, as the threaded portion is the weak point of the bolt.

Matching components: A325 bolts must be used with nuts (such as ASTM A563) and washers (such as ASTM F436) that meet specific standards to ensure consistent performance of the entire connection system.

ASTM A325 Bolt Dimensions

Bolt Diameter	D	F			C		H			T
	Body Diameter	Width Across Flats			Width Across Corners		Height			Thread Length
	Max	Basic	Max	Min	Max	Min	Basic	Max	Min	Basic
1⁄2	0.515	7⁄8	0.875	0.85	1.01	0.969	5⁄16	0.323	0.302	1
5⁄8	0.642	11⁄16	1.062	1.031	1.227	1.175	25⁄64	0.403	0.378	1.25
3⁄4	0.768	11⁄4	1.25	1.212	1.443	1.383	15⁄32	0.483	0.455	1.38
7⁄8	0.895	17⁄16	1.438	1.394	1.66	1.589	35⁄64	0.563	0.531	1.5
1	1.022	15⁄8	1.625	1.575	1.876	1.796	39⁄64	0.627	0.591	1.75
11⁄8	1.149	113⁄16	1.812	1.756	2.093	2.002	11⁄16	0.718	0.658	2
11⁄4	1.277	2	2	1.938	2.309	2.209	25⁄32	0.813	0.749	2
13⁄8	1.404	23⁄16	2.188	2.119	2.526	2.416	27⁄32	0.878	0.81	2.25
11⁄2	1.531	23⁄8	2.375	2.3	2.742	2.622	15⁄16	0.974	0.902	2.25

Installation and Maintenance

Installation Requirements: Before installation, inspect the bolts to ensure their specifications and performance meet design requirements. Ensure the bolt surfaces are clean and free of oil, rust, or other defects. During installation, tighten the bolts according to the specified torque. For shear-type bolts, ensure that the shear condition of the shear slot meets the requirements to ensure that the preload meets the design standards. Additionally, avoid over-tightening the bolts during installation to prevent plastic deformation or breakage.

Maintenance and Inspection: During use, bolts should be inspected regularly to check for loosening, rust, cracks, or other issues. Loose bolts should be tightened promptly. Bolts with severe rust or cracks should be replaced immediately to prevent compromising the safety of the connection structure. Additionally, bolts used in humid or corrosive environments should be protected with measures such as regular application of anti-rust paint to extend their service life.

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ASTM F3125 A325 Heavy Hex Bolts Order

Z0065c — Mon, 26 May 2025 03:51:22 +0000

ASTM F3125 A325 Heavy Hex Bolts Order

We are pleased to announce that one of our long-term clients has placed a repeat order for some of ASTM F3125 Grade A325 heavy hex bolts. This order includes various sizes with 3/8″ UNC thread and lengths of 3/4″, 1 1/4″, 1 1/2″, and 2 inches. The hot-dip galvanized coating provides excellent corrosion resistance, making them widely used in steel construction and infrastructure projects.

We are a professional manufacturer specializing in a wide range of pipe fittings and bolts. Our products are available in various materials and specifications to meet the needs of different industrial applications. Our products are manufactured with strict quality control and meet international standards. If you need custom fasteners or standard bolts that meet ASTM, DIN, or ISO specifications, feel free to contact us. We welcome cooperation with clients from around the world.

Product Descriptions

DESCRIPTION	Quantity	Unit
BOLT, HEAVY HEX, 3/8″ UNC x 1 1/2″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	850	EA
BOLT, HEAVY HEX, 3/8″ UNC x 1 1/4″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	200	EA
BOLT, HEAVY HEX, 3/8″ UNC x 2″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	550	EA
BOLT, HEAVY HEX, 3/8″ UNC x 3/4″ LG, ASTM F3125 GR. A325 TYPE 1, HOT DIPPED GALVANISED	200	EA

ASTM F3125 Grade A325 Heavy Hex Bolts Chemical Composition

Carbon: 0.30 – 0.52
Manganese: 0.60 min
Phosphorus: 0.035 max
Sulfur: 0.040 max
Silicon: 0.15 – 0.30
Boron: 0.003 max
Copper: Not Specified
Nickel: Not Specified
Chromium: Not Specified
Vanadium: Not Specified
Molybdenum: Not Specified
Titanium: Not Specified

ASTM F3125 Grade A325 Heavy Hex Bolts Mechanical Property

Grade: 120 ksi (A325/F1852)
Tensile Strength: 120 min ksi
Yield Strength: 92 ksi min
Elongation (min): 14%
Reduction of Area: 35% min

ASTM F3125 A325 Heavy Hex Bolts Inspection

According to the ASTM F3125 A325 standard, both the thread length and head diameter were measured and found to be within the specified tolerances. All these heavy hex bolts have successfully passed quality inspection and are qualified for delivery.

The post ASTM F3125 A325 Heavy Hex Bolts Order appeared first on Supplier of Quality Forged Fittings-Flanges.

ASTM A490 Type 3 Heavy Hex Bolts Order

Z0065c — Mon, 05 Aug 2024 07:51:42 +0000

In July, Ms Sylvia from NHAN VIET ICS JSC in Vietnam were sourcing for the stud bolts and nuts:

Our price is very competitive , and reward the PO successfully. Meanwhile, we offer the FORM E and CO certification issued by the official goverment in order to reduce the custom clearance tax, our partner is very pleased with that.

ASTM A490 Type 3 Heavy Hex Bolts Specification

ASTM A490 bolts are heavy hex bolts made of alloy steel with a flat bearing surface, washer faced, and chamfered point. They are used in structural steel joints in heavy construction applications that require greater yield and tensile strengths than those of an A325 bolt are required. They are available in diameters ranging from ½” up to 1-1/2” and come in two types.

Type 1 bolts are made from alloy steel, and Type 3 is made from a weathering steel, which is approximately twice as resistant to corrosion as Type 1. These Type 3 A490 bolts shall be marked “A490” to set them apart from standard A490 bolts.

A490 Types

TYPE 1	Medium carbon and alloy steel.
TYPE 2	Withdrawn in 2002.
TYPE 3	Weathering steel.
M	Metric A490.

A490 ASTM A490 Type 3 Chemical Properties

Chemical Requirements for Type 3 Bolts
Element	Heat Analysis, %	Product Analysis, %
Carbon
Sizes 0.75 in. and smaller	0.20–0.53	0.19–0.55
Sizes larger than 0.75 in.	0.30–0.53	0.28–0.55
Manganese, min	0.40	0.37
Phosphorus, max	0.035	0.040
Sulfur, max	0.040	0.045
Copper	0.20–0.60	0.17–0.63
Chromium, min	0.45	0.42
Nickel, min	0.20	0.17
or
Molybdenum, min	0.15	0.14

A490 ASTM A490 Type 3 Mechanical Properties

Size	Tensile, ksi	Yield, ksi	Elong. %, min	RA %, min
1/2 – 1-1/2	150-173	130	14	40

Heavy Hex Bolts Tensile Properties

Tensile Load Requirements for Bolts Tested Full-Size
Bolt Size,Threads per Inch,and Series Designation	Stress Area,^Ain²	Tensile Load ^B lbf		Proof Load ^B	Allermative Proof Load,^B lbf
Bolt Size,Threads per Inch,and Series Designation	Stress Area,^Ain²	min	max	Length Measurement Method	Yield Strength Method
Column 1	Column 2	Column 3	Column4	0dumn 5	Column 6
1/2 -13 UNC	0.142	21300	24600	17050	18500
5/8 -11 UNC	0.226	33900	39100	27100	29400
3/4 -10 UNC	0.334	50100	57800	40100	43400
7/8 -9 UNC	0.462	69300	79950	55450	60100
1-8 UNC	0.606	90900	104850	72700	78800
1 1/8 -7 UNC	0.763	114450	132.000	91550	99200
11/4 -7 UNC	0.969	145350	167680	16.300	26000
13/8 -6 UNC	1.155	173250	199850	138600	150200
11/2 -6 UNC	1.405	210750	243100	168600	182600

^AThe stress area is calculated as follows:

A.=0.7854[D-(0.9743/n)]²

where:

A – stress area, in.²

B – nominal bolt size, and

C – threads per inch.

^B Loads tabulated and loads to be used for tests of full-size bolts larger than 1% in. in diameter are based on the following.

Inspecting ASTM A490 Type 3 Heavy Hex Bolts

Dimensional measurement:

Use measuring tools such as calipers and micrometers to check the dimensions of the bolts, including diameter, length, thread size, etc.

Ensure that the dimensions meet the relevant standards and design requirements.

Appearance inspection:

Visually inspect the surface of the bolts to check for defects such as cracks, scratches, rust, etc.

Check whether the threads are complete and the head shape is correct.

Heavy Hex Bolts Key Advantages

Enhanced Corrosion Resistance:

High Strength:

Suitability for Outdoor Environments:

Reduced Maintenance

Important Considerations:

While the weathering steel provides corrosion resistance, it’s essential to understand that it’s designed for specific environmental conditions. They are not suitable for all environments, particularly those with excessive chloride exposure (e.g., coastal areas with high salt content).

The selection of compatible washers and nuts is crucial for optimum performance.

It is very important to remember that certain coatings can cause hydrogen embitterment in high strength bolts, like A490 bolts, and are therefor prohibited.

In essence, ASTM A490 Type 3 bolts offer a combination of high strength and improved corrosion resistance, making them a reliable choice for demanding structural applications.

The post ASTM A490 Type 3 Heavy Hex Bolts Order appeared first on Supplier of Quality Forged Fittings-Flanges.