ASTM A193 Grade B8M Stud Bolt and A194 grade 8M Hex Nuts

Stud bolts & hex nuts

Stud bolts and hex nuts are commonly used together to create secure connections in various applications, such as construction, machinery, and infrastructure. The stud bolt provides a threaded end for fastening, while the hex nut is used to secure and tighten the connection. These components are often made from materials such as carbon steel, alloy steel, or stainless steel to ensure strength and durability.

ASTM A193 B8M stud bolt, SS316 Stud bolt,SUS316 Stud bolt, B8M stud bolts, B8M heavy hex bolts, and other B8M fasteners are commonly used in marine and other heavy industrial environments that require corrosion resistant fasteners to be used. It is offten incorrectly thought that B8 studs and fasteners (304 stainless) are mechanically weeker than B8M studs and fasteners (316 stainless steel).

A194 8M Hex Nuts

ASME B18.2.1 Stud Bolt &ASME B18.2.2 hex nuts

A193 B8M Hex Bolt

We also supply A193 B8 Stud bolts and A194 Gr 8 Hex nuts

Both grade can be PTFE COATED

XYLAN/PTFE COATED A193 B8 Stud bolts and A194 Gr 8 Hex nuts

XYLAN/PTFE COATED A193 B8M Stud bolts and A194 Gr 8M Hex nuts

ASTM A193 Grade B8M Stud Bolt stainless bolt

Production Description

Type: Stud Bolts and Nuts.
Material: A193 B8M Stud Bolt and A194 8M Hex Nuts

A193 B8M Hex Bolt and A194 8M Hex Nuts
Standard: ASME B18.2.1, ASME B18.2.2.

B7	Alloy steel, AISI 4140/4142 quenched and tempered
B8	Class 1 Stainless steel, AISI 304, carbide solution treated.
B8M	Class 1 Stainless steel, AISI 316, carbide solution treated.
B8	Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M	Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened
B16	A heat-treated chromium-molybdenum-vanadium steel for high-pressure, high-temperature service.

ASTM A193 Grade B8M & ASTM A194 Grade 8M

Mechanical Properties

Bolt -Grade Identification Markings

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
B16	Up to 2-1/2	125	105	18	50
	2-5/8 – 4	110	95	17	45
	4-1/8 – 7	100	85	16	45

Material Chemical Composition

Element	B7 (AISI 4140)	B8 (AISI 304)	B8M (AISI 316)	B16 (AISI 4140)
Carbon	0.37 – 0.49%	0.08% max	0.08% max	0.37 – 0.49%
Manganese	0.65 – 1.10%	2.00% max	2.00% max	0.65 – 1.10%
Phosphorus, max	0.035%	0.045%	0.045%	0.035%
Sulfur, max	0.040%	0.030%	0.030%	0.040%
Silicon	0.15 – 0.35%	1.00% max	1.00% max	0.15 – 0.35%
Chromium	0.75 – 1.20%	18.0 – 20.0%	16.0 – 18.0%	0.75 – 1.20%
Nickel	8.0 – 11.0%	10.0 – 14.0%
Molybdenum	0.15 – 0.25%	2.00 – 3.00%	0.15 – 0.25%