ASME B18.2.1 Stud Bolt ASME B18.2.2 Hex Nuts

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

Type: Stud Bolts and Nuts.
Material: ASTM A193 B7, ASTM A194 2H.
Standard: ASME B18.2.1, ASME B18.2.2.

I. Strength Grades

Surface Treatments

Plating
- Zinc (White / Yellow / Black)
- Cadmium (White / Yellow / Black)
- Zinc Nickel

A193 B6 – Heat treated 410 stainless (410HT)

A193 B8 – Produced to grade AISI 304, carbide solution treated, standardly available in class 1

A193 B8M – Produced to grade AISI 316, carbide solution treated, standardly available in class 1

A193 B8C- Grade 347 stainless material

A193 B8T – Grade 321 stainless material

A320 B8 – Produced to grade AISI 304, carbide solution treated, standardly available in class 1

A320 B8M – Produced to grade AISI 316, carbide solution treated, standardly available in class 1

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.

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%