A193 B7 Heavy Hex Bolts Heavy Hex Cap Screws
Standard: ASME/ANSI B18.2.1, ASME/ANSI B18.2.3.7M
(Various types of head are available)
Inch Size: 1/2”-2.3/4” with various lengths
Metric Size: 1/2-M72 with various lengths
Grade: ASTM A193 B7
Finish: Black Oxide, Zinc Plated, Zinc Nickel Plated, PTFE etc.
Packing: Bulk about 25 kgs each carton, 36 cartons each pallet
Advantage: High Quality and Strict Quality Control, Competitive Price,Timely Delivery; Technical Support, Supply Test Reports
Please feel free to contact us for more details.
ASTM A193
Scope
Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
Grades
| 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 |
Mechanical Properties
| 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 |
Recommended Nuts and Washers
| 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 |
Strain hardened nuts available as a supplementary requirement
Specifications grading is a system of student assessment described by Linda Nilson in her newest book, “Specifications Grading: Restoring Rigor, Motivating Students, and Saving Faculty Time”. In specs grading, assessments are aligned with learning outcomes and implemented using bundles of assignments that are graded pass/fail, and students choose the grade they wish to attain and select the bundles accordingly. For more background, see the links at the end of this post.
In this hangout, +Theron Hitchman of the University of Northern Iowa and I will be talking specs grading and its potential use in university mathematics courses. TJ and I just finished reading the book and so we are not experts in this — the discussion is for hammering out thoughts and airing out ideas. Hope to see you there.
In case it’s not clear, the hangout is on Thursday, December 4 at 3pm Eastern.
More background:
+ Article on specs grading: https://www.utimes.pitt.edu/?p=30598
+ Interview with Linda Nilson: https://chronicle.com/blognetwork/castingoutnines/2014/11/25/41-interview-linda-nilson/
+ Link to her book: https://amzn.com/1620362422
websites:https://www.minjiesteel.com/
We are a professional manufacture and exporter for steel prodcuts. The main products are pre galvanized steel pipe, hot dip galvanized pipe,welded steel pipe, square&rectangular tube and scaffolding products. Our manufacturing equipment include 4 pre galvanized product lines, 8 ERW steel pipe product lines, 3 hot-dipped galvanized process lines. According to the standard of GB,ASTM,DIN,JIS. The products are under the ISO9001 quality certification manage mode. Annual output of various pipe is more than 300 thousands tons, covering the range of 21.3-457mm round pipe,15*15-500*500mm square tube,15*20-500*100mm rectangular tube, , with thickness of 0.8-30mm.
Email: info@minjiesteel.com websites:https://www.minjiesteel.com/
We are a professional manufacture and exporter for steel prodcuts. The main products are pre galvanized steel pipe, hot dip galvanized pipe,welded steel pipe, square&rectangular tube and scaffolding products. Our manufacturing equipment include 4 pre galvanized product lines, 8 ERW steel pipe product lines, 3 hot-dipped galvanized process lines. According to the standard of GB,ASTM,DIN,JIS. The products are under the ISO9001 quality certification manage mode. Annual output of various pipe is more than 300 thousands tons, covering the range of 21.3-457mm round pipe,15*15-500*500mm square tube,15*20-500*100mm rectangular tube, , with thickness of 0.8-30mm.
Email: info@minjiesteel.com