ASTM A320 Grade B8 Bolts, A320 B8 Class 2 and 1 Stud Bolt Uses

A320 B8 Class 2 Stud Bolt Manufacturer in India For Pressure Vessels and Valves

A320 B8 Class 2 Stud Bolt Applications

Siddhagiri Metals is a leading ASTM A320 Grade B8 Bolts Manufacturer in India, supplying high-quality fasteners for critical applications.

Pressure Vessels
Chemical
Power Generation
Valves
Oil and Gas
Wind Tower
Construction
Electronic

A320 B8 Class 2 Stud Bolt

ASTM A320 Gr 8 Class 1 Nut

ASME SA320 Grade B8m Screw

Table of Content

ASTM A320 Grade B8 Bolts Specification
Stainless Steel A320 Gr B8 Hex Bolts Dimensions
A193 Grade B8 Bolt Price
ASTM A320 B8 Class 2 Bolts Sizes
ASTM A320 Grade B8 Class 2 Hex Nuts Dimensions
ASME SA320 Grade B8m Screw Heat Treatment Process
A320 Grade B8 Fasteners Testings
Why must these bolts be tested at low temperatures?
A193 Grade B8 vs. A320 Grade B8
ASTM A320 B8 Hex Bolts Weight Chart

When should A320 Grade B8 bolts be used instead of A193 Grade B8?
Why are A320 Grade B8 bolts preferred in cryogenic applications?
ASTM A320 Grade B8 Bolts Torque Chart
ASTM A320 Grade B8 Bolts Types
ASTM A320 Grade B8 Stud Bolts Mechanical Requirements
ASTM A320 Impact Test Requirements
ASTM A320 Nut & Washer Compatability Chart
SS ASTM A320 Grade B8 Fasteners Equivalent
ASTM A320 Chemical Composition
A320 B8 Bolt Physical Properties

ASTM A320 Grade B8 Bolts Specification

ASTM A320 Grade B8 Bolts Standard Sizes

Imperial Sizes : 1/4" to 4"
Metric sizes: M10 to M110
Length: 12 to 1200 mm

ASTM A320 Grade B8 Bolts Thread

UNC, BSW
METRIC, UNF
BSF etc.

ASTM A320 Gr 8 Stud Bolt End

Sheared
Chamfer, Flat
Rounded
Saw cut

ASTM A320 Grade B8 Class 2 Screws Head Shape

Round
Pan
Button
Truss

A320 B8 Class 2 Threaded Rod Thread

Right hand
Left hand
Both right and left etc.

ASTM A320 Grade B8 Bolts Physical Properties

Density: 7.9 g/cm³
Melting Point: 1,400 – 1,450 °C
Temprature Range:Up to ~870 °C

ASTM A320 Gr 8 Screw Standards

ASTM: A320
ASME : SA320

ASTM A320 Grade B8m Bolts Neck Type

Knurled
Square
Hex, Triangular

A193 Grade B8 Studs Types

Double-End
Fine/ Fully Threaded
Tap-End

A320 Grade B8 Fasteners Process

Hot Forging
Cold Forging
CNC machined

A320 B8 Class 2 Stud Bolt Surface Finish

Phosphating
Oxidation
HDG

ASTM A320 Grade B8 Class 1 Screw Tip Style

Rolled
Dog
Die, A pinch

A320 B8 Class 2 Screw Thread Pitch

Coarse Threads
Fine Threads

ASTM A320 Grade B8 Threaded Rod Condition

Threading
Cold Drawn

ASTM A320 Gr 8 Screw Application

Power Generation
Oil & Gas
Pharmaceutical
Shipbuilding

A320 B8 Class 2 Threaded Rod Origin

Japanese
Indian, Korean
European
American

Supplier Of ASTM A320 Gr 8 Class 1 Nut in Mumbai With Diameter upto 3⁄4 in. or Custom

Stainless Steel A320 Gr B8 Hex Bolts Dimensions

Heavy Hex Bolt Diameter	C		D	F			H
	Width Across Corners		Body Diameter	Width Across Flats			Height
	Max	Min	Max	Basic	Max	Min	Basic	Max	Min
1/2	1.010	0.969	0.515	7/8	0.875	0.850	11/32	0.364	0.302
1-3/4	3.175	3.035	1.785	2-3/4	2.750	2.662	1-5/32	1.196	1.054
5/8	1.227	1.175	0.642	1-1/16	1.062	1.031	27/64	0.444	0.378
2-1/4	4.041	3.862	2.305	3-1/2	3.500	3.388	1-1/2	1.548	1.327
2-1/2	4.474	4.275	2.559	3-7/8	3.875	3.750	1-21/32	1.708	1.479
1-1/8	2.093	2.002	1.149	1-13/16	1.812	1.756	3/4	0.780	0.658
3/4	1.443	1.383	0.768	1-1/4	1.250	1.212	1/2	0.524	0.455
7/8	1.660	1.589	0.895	1-7/16	1.438	1.394	37/64	0.604	0.531
1	1.876	1.796	1.022	1-5/8	1.625	1.575	43/64	0.700	0.591
2	3.608	3.449	2.039	3-1/8	3.125	3.025	1-11/32	1.388	1.175
1-1/4	2.309	2.209	1.277	2	2.00	1.938	27/32	0.876	0.749
1-3/8	2.526	2.416	1.404	2-3/16	2.188	2.119	29/32	0.940	0.810
1-1/2	2.742	2.622	1.531	2-3/8	2.375	2.300	1	1.036	0.902

A193 Grade B8 Bolt Price

ASTM A320 Grade B8 Bolts at an unbeatable price with ASTM, Find Out More Here

ASTM A320 B8 Class 2 Bolts Sizes

Size in Inch	Hex Bolt Diameter [in]	Bolt Width Across Flats		Bolt Head Height
Size in Inch	Hex Bolt Diameter [in]	Nominal [in]	Min. [in]	Nominal [in]	Min. [in]
1/2"	0.5000	3/4"(0.750)	0.725	11/32"	0.302
1-1/8"	1.1250	1-11/16"(1.688)	1.631	3/4"	0.658
1/4"	0.2500	7/16"(0.438)	0.425	11/64"	0.150
5/16"	0.3125	1/2"(0.500)	0.484	7/32"	0.195
3/8"	0.3750	9/16"(0.562)	0.544	1/4"	0.226
1-7/8"	1.8750	2-13/16"(2.812)	2.719	1-1/4"	1.130
5/8"	0.6250	15/16"(0.938)	0.906	27/64"	0.378
3/4"	0.7500	1-1/8"(1.125)	1.088	1/2"	0.455
7/16"	0.4375	5/8"(0.625)	0.603	19/64"	0.272
7/8"	0.8750	1-5/16"(1.312)	1.269	37/64"	0.531
1"	1.0000	1-1/2"(1.500)	1.450	43/64"	0.591
1-1/4"	1.2500	1-7/8"(1.875)	1.812	27/32"	0.749
1-3/8"	1.3750	2-1/16"(2.062)	1.994	29/32"	0.810
1-1/2"	1.5000	2-1/4"(2.250)	2.175	1"	0.902
1-5/8"	1.6250	2-7/16"(2.438)	2.356	1-3/32"	0.978
1-3/4"	1.7500	2-5/8"(2.625)	2.538	1-5/32"	1.054
2"	2.0000	3"(3.000)	2.900	1-11/32"	1.175

ASTM A320 Grade B8 Class 2 Hex Nuts Dimensions

Metric Nut Size	Thread Pitch	e	s		m
		Width Across Corners	Width Across Flats		Height of Nut
		min.	max.	min.	max.	min.
M3.5*	0.6	6.58	6.00	5.82	2.80	2.55
M4	0.7	7.66	7.00	6.78	3.2	2.9
M3	0.5	6.01	5.50	5.32	2.40	2.15
M16	2	26.75	24.00	23.67	14.8	14.1
M18*	2.5	29.56	27.00	26.16	15.8	15.1
M39*	4	66.44	60.0	58.8	33.4	31.8
M42	4.5	71.3	65.0	63.1	34.0	32.4
M5	0.8	8.79	8.00	7.78	4.7	4.4
M6	1	11.05	10.00	9.78	5.2	4.9
M8	1.25	14.38	13.00	12.73	6.80	6.44
M10	1.5	17.77	16.00	15.73	8.40	8.04
M12	1.75	20.03	18.00	17.73	10.80	10.37
M14*	2	23.36	21.00	20.67	12.8	12.1
M20	2.5	32.95	30.00	29.16	18.0	16.9
M22*	2.5	37.29	34	33	19.4	18.1
M24	3	39.55	36	35	21.5	20.2
M27*	3	45.2	41	40	23.8	22.5
M30	3.5	50.85	46	45	25.6	24.3
M33*	3.5	55.37	50	49	28.7	27.4
M36	4	60.79	55.0	53.8	31.0	29.4
M1.6	0.35	3.41	3.20	3.02	1.30	1.05
M2	0.4	4.32	4.00	3.82	1.60	1.35
M2.5	0.45	5.45	5.00	4.82	2.00	1.75
M45*	4.5	76.95	70.0	68.1	36.0	34.4

Offer ASME SA320 Grade B8m Screw With Heat Treatment like Carbide Solution Treated

ASME SA320 Grade B8m Screw Heat Treatment Process

Solution Annealing
Carbide Precipitation Control
Strain Hardening
Final Condition

A320 Grade B8 Fasteners Testings

Siddhagiri Metals is a trusted ASTM A320 Grade B8 Bolts Supplier in India, offering products that undergo rigorous testing.

Tensile Testing
Hardness Tests
Corrosion Testing
Torsion Testing
Charpy Impact Test
Proof Load Test
Corrosion Testing
Ferritiscope Testing

Why must these bolts be tested at low temperatures?

Understand Comparison of A193 Grade B8 vs. A320 Grade B8

A193 Grade B8 vs. A320 Grade B8

Property	A193 B8	A320 B8	Unit
Min Tensile Strength	515	515	MPa
Min Yield Strength	205	205	MPa
Min Elongation	30	30	%
Min Reduction of Area	50	50	%
Min Solution Anneal Temp	1040	1040	°C
Material Type	304	304	SS
Test Temperature	21	-101	°C

ASTM A320 B8 Hex Bolts Weight Chart

Bolt Size (inches)	Weight per 100 pieces (lbs)	Weight per 100 pieces (kg)
1/2" x 2"	12.87	5.84
5/8" x 1"	10.04	4.56
1/4" x 1"	1.39	0.63
1/4" x 2"	2.78	1.26
5/16" x 1"	2.29	1.04
5/8" x 2"	20.08	9.12
3/4" x 1"	14.65	6.65
3/4" x 2"	29.30	13.30
7/8" x 1"	21.58	9.79
7/8" x 2"	43.19	19.58
1" x 1"	28.70	13.02
1" x 2"	57.40	26.04
5/16" x 2"	4.58	2.08
3/8" x 1"	3.24	1.47
3/8" x 2"	6.49	2.94
1/2" x 1"	6.44	2.92

When should A320 Grade B8 bolts be used instead of A193 Grade B8?

Condition	A320 Grade B8	A193 Grade B8
Temperature Range	< -29°C	> -29°C
Application	Cryogenic, LNG, Low-Temp Service	Boilers, Piping, General Industrial
Impact Testing	Required	Not Required
Test Temperature	Down to -101°C	Room Temperature (~21°C)
Mechanical Focus	Low-Temp Toughness	High-Temp Strength
Standard	ASME SA320 / ASTM A320	ASME SA193 / ASTM A193
Typical Use Environment	Arctic, Cryogenic, Refrigeration	Power Plants, Refineries, Heat Exchangers

Weekly Delivery of ASTM A320 Grade B8 Bolts in below countries:

Export to	Continent	Shipping time
Egypt	Africa	18 Days
Netherlands	Europe	30 Days
Kuwait	Asia	10 Days
Nigeria	Africa	30 Days

Monthly Delivery of ASTM A320 Grade B8 Bolts in below countries:

Export to	Continent	Shipping time
South Africa	Africa	25-30 Days
Kenya	Africa	19 Days
Oman	Asia	5 Days
USA	North America	40-60 Days

Why are A320 Grade B8 bolts preferred in cryogenic applications?

Excellent Toughness
Low-Temperature
Corrosion Resistance
Stable Microstructure
Compliance with Cryogenic Standards

ASTM A320 Grade B8 Bolts Torque Chart

Bolt Size (inches)	Torque (Nm)	Torque (ft-lb)
1/2"	47.5-67.8	35-50
9/16"	74.6-101.5	55-75
5/8"	101.5-135.6	75-100
3/4"	189.8-257.5	140-190
7/8"	304.2-406.8	225-300
1/4"	6.8-9.5	5-7
5/16"	13.6-17.6	10-13
3/8"	20.3-27.1	15-20
7/16"	29.8-40.7	22-30
1"	474.5-644.3	350-475

ASTM A320 Grade B8 Bolts Types

ASTM A320 Grade B8 Hex Bolts

ASTM A320 Grade B8 Class 2 Threaded Rod

ASTM A320 Grade B8 Class 1 Hex Nut

ASTM A320 Gr 8 Flange Bolts

ASTM A320 Grade B8 Square Bolts

ASTM A320 Grade B8m U Bolts

A320 B8 Class 2 Eye Bolts

ASTM A320 Grade B8 Anchor Bolts

Stock and Supply A320 Grade B8 Fasteners With Max Hardness 241 Hb (100 Hrb)

ASTM A320 Grade B8 Stud Bolts Mechanical Requirements

Grade and Class	Diameter, in. [mm]	Heat Treatment	Yield Strength, min, ksi [MPa] (0.2 % offset)	Tensile Strength, min, ksi [MPa]	Reduction of Area, min, %	Elongation in 2 in. or 50 mm, min, %	Hardness, max
ASTM A320 B8 Class 1	All diameters	carbide solution treated	30 [205]	75 [515]	50	30	223 HBWDor 96 HRB
ASTM A320 B8 Class 2	3/4 [20] and under	carbide solution treated and strain hardened	100 [690]	125 [860]	35	12	321 HBW or 35 HRC
	over 3/4 to 1 [20 to 25], incl		80 [550]	115 [795]	30	15	321 HBW or 35 HRC
	over 1 to 11/4 [25 to 32], incl		65 [450]	105 [725]	35	20	321 HBW or 35 HRC
	over 11/4 to 11/2 [32 to 40], inclA		50 [345]	100 [690]	45	28	321 HBW or 35 HRC

ASTM A320 Impact Test Requirements

Size of Specimen, mm	Test Temperature		Minimum impact value permitted for one specimen only of a set, ft-lbf [J]	Minimum impact value required for average of each set of three specimens, ft-lbf [J]
Size of Specimen, mm	°F	°C
10 X 10	-150	-101	15 [20]	20 [27]
10 X 7.5	-150	-101	12 [16]	16 [22]

ASTM A320 Nut & Washer Compatability Chart

Grade	Nuts	Washers
L7	A194 Grade 4 or 7	F-436
L43	A194 Grade 4 or 7	F-436
B8 Class 1	A194 Grade 8	304-SS
B8 Class 2	A194 Grade 8	304-SS
B8M Class 1	A194 Grade 8M	316-SS
B8M Class 2	A194 Grade 8M	316-SS

SS ASTM A320 Grade B8 Fasteners Equivalent

Different Grades	ASTM	Conditions
AISI 4140/ 4142	A320 L7	Quenched and tempered
AISI 4145	A320 L7M	Quenched and tempered
AISI 4340	A320 L43	Quenched and tempered
AISI 304	A320 B8 Class 1	Carbide solution treated
AISI 304	A320 B8 Class 2	Carbide solution treated, Strain hardened
AISI 316	A320 B8M Class 1	Carbide solution treated
AISI 316	A320 B8M Class 2	Carbide solution treated, Strain hardened

ASTM A320 Chemical Composition

Element	Composition, % A
Element	Chromium Molybdenum B
Carbon, max	0.08
Sulfur, max	0.030
Silicon, max	1.00
Nickel	8.00 - 11.00
Chromium	18.00 - 20.00
Manganese, max	2.00
Phosphorus, max	0.045

A320 B8 Bolt Physical Properties

Property	Value
Density	7.90 g/cm³
Melting Range	1400°C (2550°F)
Hardness	Rockwell B 90 maximum
Thermal Conductivity	16.2 W/m·K
Coefficient of Thermal Expansion	15.9 x 10⁻⁶ /°C

Additional service : Small quantity | Custom order | hard to find items | Sourcing from other countries

Why Siddhagiri Metals & Tubes ?

PED 2014/68/ EU Approved Manufacturer for Steel Forgings.
Stockist, Wholesaler, Retailer and Trader of Steel Bars, Bolts and Nuts, Machined Components in Nickel Alloys, High Temperature Alloys, Super Alloys
Rank in Top 5 Exporter of Nickel Alloy Forgings in India and 73rd Position in Asia As Per Import and Export data of 2022
Supplying Oil and Gas Piping Products As Per Standard NACE MR0175 / ISO 15156 to the Netherlands, Tunisia, South Africa, Azerbaijan, Saudi Arabia, Alzeria, Morocco and Egypt Since 2002.
India's Largest Importer and Stockholder of Bolting Accessories in Ferrous and Non Ferrous Metals.