ASTM A193 B8 CL2 Bolts

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ASTM A193 B8 Class 2 bolts from Hazlewood Fasteners in Canberra, Australia, embody precision, resilience, and engineered superiority for mission-critical industrial environments. Manufactured from strain-hardened 304 stainless steel, these bolts are crafted to thrive under punishing pressure, elevated temperature cycles, and corrosive atmospheres where ordinary fasteners fall short. With heightened mechanical strength and unwavering resistance to oxidation and chemical attack, they deliver steadfast clamping force across refinery plants, petrochemical networks, boiler units, and power infrastructure. When operational continuity, long-term performance, and uncompromising safety are non-negotiable, our B8 Class 2 bolts stand as the trusted fastening backbone.

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ASTM A193 B8 Class 2 bolts are produced using strain-hardened 304 stainless steel, enriched with chromium and nickel for robust corrosion resistance. The Class 2 hardening process significantly elevates tensile and yield strength, ensuring exceptional load-bearing capability and fatigue endurance under cyclic heat and pressure. These bolts boast excellent oxidation resistance, strong ductility, and high stress-rupture strength, maintaining stable preload and thread integrity in demanding service conditions. Their metallurgical refinement ensures dependable performance in corrosive processing systems, pressure circuits, and thermal environments.

ASTM A193 B8 CL2 Bolts Chemical Composition

Element	B7	B8	B8M
Carbon	0.37 – 0.49%	0.08% max	0.08% max
Manganese	0.65 – 1.10%	2.00% max	2.00% max
Phosphorus, max	0.035%	0.045%	0.045%
Sulfur, max	0.040%	0.030%	0.030%
Silicon	0.15 – 0.35%	1.00% max	1.00% max
Chromium	0.75 – 1.20%	18.0 – 20.0%	16.0 – 18.0%
Nickel		8.0 – 11.0%	10.0 – 14.0%
Molybdenum	0.15 – 0.25%		2.00 – 3.00%

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ASTM A193 B8 CL2 Bolts Mechanical Properties

Grade	Size	Tensile ksi, min	Yield, ksi, min	Elong, %, min	RA % min
B7	Up to 2-1/2	125	105	16	50
	2-5/8 – 4	115	95	16	50
	4-1/8 – 7	100	75	18	50
B8 Class 1	All	75	30	30	50
B8M Class 1	All	75	30	30	50
B8 Class 2	Up to 3/4	125	100	12	35
	7/8 – 1	115	80	15	35
	1-1/8 – 1-1/4	105	65	20	35
	1-3/8 – 1-1/2	100	50	28	45
B8M Class 2	Up to 3/4	110	95	15	45
	7/8 – 1	100	80	20	45
	1-1/8 – 1-1/4	95	65	25	45
	1-3/8 – 1-1/2	90	50	30	45

ASTM A193 B8 CL2 Bolts Specifications

Material	Specification	Standards	Size	Length
ASTM A193 B8 CL2 Hex Bolt	IS BS ASTM	DIN, ISO, JIS, GB, IS, BS, ASTM	M 02 to M 160	3 mm to 200 mm

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ASTM A193 B8 Class 2 bolts are essential for pressure-critical and high-temperature applications across petrochemical refineries, steam systems, heat-treatment facilities, desalination units, chemical processing plants, and food-grade manufacturing pipelines. Frequently used to secure piping flanges, reactor assemblies, boiler tubes, turbine housings, pumps, and pressure vessels, they deliver unwavering fastening security in chloride-bearing, oxidizing, and thermally active environments. Whether anchoring mechanical equipment or safeguarding industrial fluid networks, these bolts are engineered to perform where strength, corrosion immunity, and operational durability are vital.

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Types of ASTM A193 B8 CL2 Bolts

We ensure that our ASTM A193 B8 CL2 bolts are packaged with the utmost care to maintain their quality and integrity. Each bolt is individually inspected and then securely packed in durable, corrosion-resistant containers. Our packaging is designed to protect the bolts during transit and storage, preventing any damage or contamination. Whether you need small or large quantities, we offer flexible packaging solutions to meet your specific requirements, ensuring your bolts arrive in perfect condition.