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Zhengzhou Huitong Pipeline Equipment Co.,Ltd. |
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1. ASTM A193 Grade B7 Fasteners Specification
FASTENERS -SCREWS, BOLTS AND NUTS FOR TOUGHEST USE
| Material | Size | Length | Specification | Manufacturer |
| ASTM A193 Grade B7 Fasteners | M 02 to M 160 | 3 mmto200 mm | IS BS ASTM | GKW Unbrako Kundan APL Sundaram Precision Infasco EBY Fastener Etc. |
Key Words: Subcategories:ASTM A93 B7 Bolts, A193 B7 Bolts,Grade B7 Bolts,A193 Grade B7,SA 193 B7 bolts,B7 Studs,B7 Studs Material,B7 Threaded Rod,B7 Threaded Bar etc
2. ASTM A193 Grade B7 Fasteners Useful Information
A193 Grade B7 Class Bolts are manufactured from AISI 4140/4142 low Carbon Alloy Steel Grades followed by quencing & tempering. We manufacture these Bolts with great precision & Quality. These grade bolts are also denoted as Grade 7 Bolts,B7 Bolts etc. We Also offer B7 Studs/B7 threaded bars/B7 Threaded rods.TorqBolt Stocks & Supply these Bolt Fasteners in various sizes & Coatings.
ASTM A193 Grade B7 Fasteners Mechanical Properties
3. 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 |
Element | B7 (AISI 4140) | B8 (AISI 304) | B8M (AISI 316) |
|---|---|---|---|
Carbon | 0.37 – 0.49% | 0.08% max | 0.08% max |
Manganese | 0.65 – 1.10% | 2.00% max | 2.00% max |
Phosphorus, max | 0.035% | 0.045% | 0.045% |
Sulfur, max | 0.040% | 0.030% | 0.030% |
Silicon | 0.15 – 0.35% | 1.00% max | 1.00% max |
Chromium | 0.75 – 1.20% | 18.0 – 20.0% | 16.0 – 18.0% |
Nickel | 8.0 – 11.0% | 10.0 – 14.0% | |
Molybdenum | 0.15 – 0.25% | 2.00 – 3.00% |
| Standard / Material grade | C | Mn | P | S | Si | Cr | Mo | Al | V |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A193 B7 (Cr- Mo AISI 4140,4142,4145 ) | 0.37-0.49 | 0.65-1.10 | 0.035 Max | 0.04 Max | 0.15-0.35 | 0.75-1.20 | 0.15-0.25 | – | – |
| ASTM A1193 B7M (Cr- Mo AISI 4140,4142,4145 ) | 0.37-0.49 | 0.65-1.10 | 0.035 Max | 0.04 Max | 0.15-0.35 | 0.75-1.20 | 0.15-0.25 | – | – |
| ASTM A193 B16 (Cr- Mo -V ) | 0.36-0.47 | 0.45-0.70 | 0.035 Max | 0.04 Max | 0.15-0.35 | 0.80-1.15 | 0.50-0.65 | 0.015Max | 0.25-0.35 |
| ASTM A193 B5 (5% Cr AISI 501) | 0.10 max | 1.00 max | 0.040 max | 0.030 Max | 1.00 Max | 0.40 -6.00 | 0.40 -0.65 | – | – |
| ASTM A320-L7 (Cr- Mo AISI 4140,4142,4145 ) | 0.38-0.48 | 0.75-1.00 | 0.035 Max | 0.04 Max | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 | – | – |
| ASTM A 320 L7M | 0.38-0.48 | 0.75-1.00 | 0.035 Max | 0.04 Max | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 | – | – |
| ASTM A194 Gr.2H | 0.40 Min | 1.00 Max | 0.040 Max | 0.050 Max | 0.40 Max | – | – | – | – |
| ASTM A194 Gr.2HM | 0.40 Min | 1.00 Max | 0.040 Max | 0.050 Max | 0.40 Max | – | – | – | – |
| ASTM A194 Gr.4 | 0.40-0.50 | 0.70-0.90 | 0.035 Max | 0.04 Max | 0.15 – 0.35 | 0.20 – 0.30 | – | – | – |
Bolt Grade | Nuts | Washers |
|---|---|---|
B7 | A194 Grade 2H | F436 |
B8 Class 1 | A194 Grade 8 | SS304 |
B8M Class 1 | A194 Grade 8M | SS316 |
B8 Class 2 | A194 Grade 8 | SS304 |
B8M Class 2 | A194 Grade 8M | SS316 |
