ASTM A193 B8 CL3 Fasteners

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ASTM A193 B8 Class 3 fasteners from Hazlewood Fasteners in Canberra, Australia, are engineered for environments where superior strength and corrosion resistance are essential. Manufactured from solution-annealed and strain-hardened 304 stainless steel, these fasteners deliver heightened mechanical durability and elevated tensile properties, outperforming standard stainless options in high-stress settings. They are ideal for mission-critical bolting applications exposed to heat, pressure, moisture, and corrosive industrial media. Preferred across chemical, power, and marine industries, our B8 Class 3 fasteners ensure lasting security, longevity, and structural reliability for demanding operational cycles and sensitive service environments.

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These ASTM A193 B8 Class 3 fasteners are crafted from high-quality 304 stainless steel subjected to solution annealing and controlled strain hardening to increase tensile and yield strength. Featuring an austenitic chromium-nickel structure, they offer dependable corrosion and oxidation resistance in steam, chemical, and chloride-prone environments. With precise thread geometry, exceptional surface stability, and enhanced preload retention, these fasteners exhibit dependable fatigue strength, torque consistency, and dimensional accuracy. Engineered for prolonged industrial service, they maintain integrity under thermal shock, vibration, and mechanical loading cycles.

ASTM A193 B8 CL3 Fasteners Chemical Composition

Element	B7	B8 CL3	B8 CL3M
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 CL3 Fasteners 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 CL3 Class 1	All	75	30	30	50
B8 CL3M Class 1	All	75	30	30	50
B8 CL3 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
B8 CL2M Class 3	Up to 3/4	110	95	15	45

ASTM A193 B8 CL3 Fasteners Specifications

Material	Specification	Standards	Size	Length
ASTM A193 B8 CL3 Fasteners	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 3 fasteners are widely utilized in industrial operations where high-strength stainless bolting is crucial. Common applications include power-generation equipment, petrochemical plants, heat exchangers, high-pressure piping networks, refinery systems, marine infrastructure, and hygienic processing facilities. They secure flanges, valves, pumps, boilers, reactor assemblies, and steam systems operating under corrosive conditions and elevated temperatures. Their consistent performance under dynamic load and corrosive exposure guarantees long-lasting joint integrity, making them the preferred choice for engineers, maintenance contractors, and industrial fabricators seeking premium-grade fastening reliability.

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Types of ASTM A193 B8 CL3 Fasteners

At Hazlewood Fasteners, we prioritize the safe and efficient packaging of ASTM A193 B8 CL3 fasteners. Each fastener is meticulously inspected and securely packaged in durable, protective materials to prevent damage during transit. Our packaging is designed to maintain the integrity and quality of the fasteners, ensuring they arrive in optimal condition. We offer customized packaging solutions to meet specific customer requirements, reflecting our commitment to excellence and customer satisfaction.