ASTM A320 GRADE B8M CLASS 2 STUD BOLTS,ASTM A194 Grade 8M Heavy Hex Nuts
We are the ASTM A320 GRADE B8M STUD BOLT manufacturer ,A320 B8M stud bolts manufactured from AISI 316 Stainless Steel carbide solution treated with Strain Hardening
ASTM A320 / A320M – 18
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
This specification covers alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for low-temperature service. Each alloy shall conform to the prescribed chemical composition requirements. The material, as represented by the tension specimens, shall conform to the requirements as to tensile properties such as tensile strength, yield strength, elongation, and hardness. The material shall meet the prescribed impact energy absorption requirements and the recommended test temperature. Mechanical tests shall be conducted on the material, namely: impact testing, tension testing, and hardness testing
ASTM A320 Grade 8M Class 1 stud bolts are similar to Grade B8 but instead are manufactured from AISI 316 stainless steel as opposed to AISI 304 stainless steel. Although more expensive, type 316 stainless offers superior corrosion resistance compared to type 304 stainless. Grade B8M Class 1 fasteners require carbide solution treatment, while Class 2 fasteners require an additional strain hardening operation.
ASTM A320 Grade 8M Class 2 Stud bolts and hex nuts
ASME B18.2.1 Stud Bolt &ASME B18.2.2 hex nuts
Type: Stud Bolts and Nuts.
Material: ASTM A320 B8M Stud Bolt and A194 8M Hex Nuts
Stub bolts Material: ASTM A193 B8M.
Nuts material: ASTM A194 8M.
Standard: ASME B18.2.1, ASME B18.2.2.
MATERIAL GRADE OF BOLTS & NUTS
| Specification | Class | Material | Nominal Size Range (in.) |
Mechanical Properties | |||||
| Minimum Tempering Temperature °F |
Tensile Strength, min, ksi [MPa] |
Yield Strength, min, ksi [MPa] (0.2 % offset) |
Elongation in 2 in. or 50 mm min, % |
Reduction of Area, min, % |
Hardness max |
||||
| ASTM A320 Grade L7 |
Bolts, Screws, Studs for Low-Temperature Service |
AISI 4140 4142 or 4145 |
2-1⁄2 and underA | 1100 | 125 | 105 | 16 | 50 | 321HBW or 35HRC |
| ASTM A320 Grade L43 |
AISI 4340 | 4 and underA | |||||||
| ASTM A320 Grade L7M |
AISI 4140 4142 or 4145 |
2-1⁄2 and underA | 1150 | 100 | 80 | 18 | 235HBWB or 99HRB |
||
| ASTM A320 Grade B8 |
Class 1 Class 1A |
AISI 304 | all diameters | — | 75 | 30 | 30 | 50 | 223HBWD or 96HRB |
| ASTM A320 Grade B8T |
AISI 321 | ||||||||
| ASTM A320 Grade B8M |
AISI 316 | 192HBW or 90HRB | |||||||
| ASTM A320 Grade B8 |
Class 2 | AISI 304
AISI 321 |
3⁄4 and under | — | 125 | 100 | 12 | 35 | 321HBW or 35HRC |
| over 3⁄4 to 1 incl | — | 115 | 80 | 15 | 30 | ||||
| ASTM A320 Grade B8T |
over 1 to 11⁄4 incl | — | 105 | 65 | 20 | 35 | |||
| over 11⁄4 to 11⁄2 inclA | — | 100 | 50 | 28 | 45 | ||||
| ASTM A320 Grade B8M |
AISI 316 | 3⁄4 and under | — | 110 | 95 | 15 | 45 | ||
| over 3⁄4 to 1 incl | — | 100 | 80 | 20 | 45 | ||||
| over 1 to 11⁄4 incl | — | 95 | 65 | 25 | 45 | ||||
| over 11⁄4 to 11⁄2 inclA | — | 90 | 50 | 30 | 45 | ||||
We also can apply xylan fluorocarbon coating on the ASTM A320 GRADE B8M Class 2 Stud bolts,
Xylan 1014 coated ASTM A320 GRADE B8M Class 2 Stud bolts
How to order our ASTM A320 GRADE B8M Class 2 Stud bolts？
Example#1，
STUD BOLTS ASTM A320 GRD B8M CLASS 2
02 HEAVY HEX NUT ASTM A194 GRD 8M
02 FLAT WASHER ASME B18.21.1, Type A, Narrow SS316
5/8“ UNC* 120mm，Quantity ：120 sets
STANDARDS:
| ASTM A320/A320M | Standard specification for alloy-steel and stainless steel bolting for low temperature service. |
| ASME B16.5 | Covers recommended stud bolt quantity, diameter, and length for use in flanged pipe fittings. |
| ASME B1.1 Class 2A | Specifies the thread form, series, class, allowance, tolerance, and desig nation for unified screw threads. UNC for 1″ diameter and smaller. UN8 (8 threads per inch) for 1-1/8″ diameter and larger. |
MATERIAL PROPERTIES:
| Stainless Steel,SS316 stud bolts, Carbide Solution Treated and Strain Hardened |
DIAMETER |
PROOF LOAD |
YIELD STRENGTH |
TENSILE STRENGTH |
CORE HARDNESS |
| 3/4″ and Under | – | 95,000 psi | 110,000 psi | C35 Max |
| 7/8″ through 1″ | – | 80,000 psi | 100,000 psi | C35 Max |
| 1-1/8″ through 1-1/4″ | – | 65,000 psi | 95,000 psi | C35 Max |
| 1-3/8” through 1-1/2” | – | 50,000 psi | 90,000 psi | C35 Max |
| Elongation | 15% Minimum for Diameters through 3/4”, 20% for 7/8″ through 1″, 25% for 1-1/8″ through 1-1/4″, 30% for 1-3/8″ through 1-1/2″ | |||
| Reduction of Area | 45% Minimum for Diameters | |||
Material strengths listed are minimum acceptable per governing standard. Core hardness based on Rockwell scale.
How to order our A320 B8M class 2 Stud Bolt and A194 8M Hex Nuts?A320 B8M class 2 Stud Bolt,1 1/4″ 8UN,length 220mm,ASME B18.2.1 Stud Bolt & ASME B18.2.2 Hex Nuts，Qty:20 pcs |
