ASTM A193 B8M Bolts

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ASTM A193 B8M Bolts are high-performance stainless steel fasteners designed for demanding industrial applications where corrosion resistance and strength are critical. Manufactured from molybdenum-bearing austenitic stainless steel, typically Grade 316, these bolts provide enhanced resistance to chlorides, pitting, and stress corrosion cracking. Ideal for high-pressure, high-temperature, and chemically aggressive environments, they are widely used in petrochemical plants, refineries, power generation units, and marine applications. With precision manufacturing and rigorous quality control, ASTM A193 B8M Bolts ensure reliable long-term performance. Industries trust these fasteners for their durability, corrosion protection, and ability to maintain structural integrity under challenging conditions.

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ASTM A193 B8M Bolts are manufactured from Grade 316 stainless steel, containing chromium, nickel, and molybdenum. The addition of molybdenum enhances resistance to chlorides and acidic environments, while chromium and nickel provide corrosion and oxidation resistance. These bolts are solution-annealed to achieve optimal mechanical properties, including high tensile and yield strength, good ductility, and stable hardness. They resist stress corrosion cracking and maintain mechanical integrity under elevated temperatures and cyclic loading. This combination of corrosion resistance, strength, and toughness makes B8M bolts suitable for harsh and high-stress industrial applications.

ASTM A193 B8M 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 B8M 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 B8M Bolts Specifications

Material	Specification	Standards	Size	Length
ASTM A193 B8M 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 B8M Bolts are widely used in industries requiring corrosion-resistant and high-strength fasteners. They are ideal for high-pressure piping, flanged joints, boilers, heat exchangers, pressure vessels, and valves in petrochemical, chemical processing, and power generation plants. Their resistance to chlorides and acidic media makes them suitable for marine, offshore, and water treatment applications. Food processing and pharmaceutical industries also rely on them due to their hygienic and non-reactive properties. With their durability, mechanical reliability, and resistance to corrosion, ASTM A193 B8M Bolts provide long-term secure fastening in critical industrial environments.

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Types of ASTM A193 B8M Bolts

Rinku fasteners contain careful packages of ASTM A193 B8M bolts to ensure safe delivery and optimal quality. Each bolt is individually inspected and carefully wrapped to prevent damage during transport. We use durable protective coatings and fasteners to keep the bolt intact. Custom packaging is available to meet specific needs. Our commitment to quality extends through our packaging, ensuring that your fasteners arrive in perfect condition, ready for immediate use.