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

ASTM A193 B7 stud bolt with two ASTM A194 2H nutsC

China Manufactuer of ANSI/ASME b18.2.1 Fully Threaded Stud Bolts with ASME B18.2.2 Hex Nuts

ASME B18.2.1 is the American Society of Mechanical Engineers standard that defines the dimensional and material requirements for bolts, stud bolts, and other fasteners. A stud bolt is a threaded rod with threads at both ends (or full length)

ASME B18.2.1 Stud Bolts Threading:

The standard specifies the threading details such as:

Unified Inch Screw Threads per ASME B1.1.

Common thread classes: 2A for external threads (stud bolts).

Material:

Materials must meet the mechanical property requirements specified by ASME. Common materials include:
- Carbon Steel
- Stainless Steel (e.g., SS316 for corrosion resistance)
- Alloy Steels
- Special high-temperature or corrosion-resistant alloys.

Nuts and Washers:

Stud bolts are typically used with heavy hex nuts (specified in ASME B18.2.2) and sometimes washers, depending on the application.

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

I. Strength Grades

DIN 931/933	Grade 4.6, 4.8, 5.6, 5.8, 8.8, 10.9, 12.9
DIN 931/933	SUS 304, 316
ASTM A307	Grade A & B
ASTM A320, A320M	Grade L7, L7M, B8, B8M
ASTM A325, A325M	Grade 8.8
ASTM A490, A490M	Grade 10.9
ASTM A193/A193M	Grade B7, B7M, B8, B8M, B16

Surface Treatments

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

Galvanising
- Hot-Dipped Galvanise
- Mechanical Galvanise

Fluorocarbon Coating
Xylan® / PTFE Coating Systems:
- Xylar 2
- 1070
- 1424
Customised Coating Systems
- Zinc + Fluorocarbon / PTFE
- Cadmium + Fluorocarbon /PTFE
- Zinc Nickel + Fluorocarbon /PTFE
- Zinc Plating + Xylan 1424 Blue coated stud bolt
- Xylar 2 + Xylan 1070 Blue coated stud bolt

STAINLESS STEEL

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%