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HEAVY HEX BOLT SCREW | BULONG CÔNG NGHIỆP NẶNG


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BULONG CHỊU LỰC VÀ CƯỜNG ĐỘ CAO (HEX BOLT SCREW GRADE B7)


IWISU là đơn vị chuyên nhập khẩu và cung cấp các loại Bulong cho nghành Công Nghiệp nặng, Dầu khí thô tiêu chuẩn: ASTM A325, ASTM A193, ASTM A320, A490

Xuất xứ: Thái Lan, Singapore, Malaysia, Đài Loan, Anh

bulong luc giac grade b7

- ASTM A325 - ASTM A 490 HEX BOLT | BULONG IWISU

IWISU is your source for ASTM A193 B7 Heavy Hex Bolts from 3/8” to 4” diameter in multiple lengths with the standard thread length fully-threaded tap bolts; and custom thread lengths. We offer 100% Domestic, approved country of origin and imports from Asia in the following finishes:

Hot-Dip Galvanized                                   Mechanical Galvanized
Zinc Plated (Clear)                                    Yellow Zinc Plated
Cadmium Plated                                       Yellow Cadmium Plated
Blue Xylan® or Blue Teflon®                        Green Xylan® or Green Teflon®
Black Oxide                                              Plain Surface

When you need ASTM A193 B7 Heavy Hex Bolts fast call IWISU and we will make it happen.

a193-b7-hex bolt-iwisu

hk-b7hexcapscrews-iwisu

ASTM A193 Grade B7 Chromium Molybendum steel, normally AISI 4140, heat treated to 28-32Rockwell Hardness, 125,000 PSI tensile strength, 105, 000 PSI yield. It will hold it’s strength to 1000 degrees F.

ASTM A193 Grade B7M It has the same chemistry as B7. Physicals have max hardness of 235 Brinell or RC22. 100,000 PSI tensile and 80,000 PSI yield. Used in areas where H2S is present.

ASTM A193 Grade B16 Chromium, molybendum, Vanadium steel. It has the same physicals as B7. Added vanadium allows it to hold it’s strength to 1100 degrees Fahrenheit.

ASTM A193 Grade B8 18-8 Grade stainless, non magnetic, good corrosion resistance. 75,000 PSI tensile strength. Same material as AISI type 304 stainless steel.

ASTM A193 Grade B8M This is similar to B8 fasteners except with added Molybdenum. It has better corrosion resistance than B8. Hex Bolts, studs and other fasteners are common to the B8M spec.

ASTM A193 Grade B8 (class 2) Studs, bolts, and other fasteners found in this grade are considered the same as B8 except strain hardened. This is a cold working process which increases physical properties. 100,000-125,000 PSI Tensile Strength.

ASTM A193 Grade B8M (Class II) Same as B8M except strain hardened, 90,000-125,000PSI Tensile Strength.

ASTM A193 Grade BC 18-8 grade stainless with additional element of Columbium- same as type 347 type stainless steel.

ASTM A193 Grade B8T 18-8 grade of stainless with additional element of Titanium. Same as type 321 Stainless Steel.

ASTM A193 Grade B6 This has the same chemistry as AISI type 410 stainless steel, but it is heat treated. 110,000 PSI tensile strength.

ASTM A193 Grade B5 Fasteners under the B5 spec have the same chemistry as AISI type 501 SS but they are heat treated to 100,000 PSI tensile strength.

ASTM A320 Grade L7 Bolts, studs, and other fasteners under the L7 grade have the same chemical and physical properties as B7. Additional requirement that it meet a Charpy Test at 150 degrees F is needed. Such fasteners are commonly used for low temperature service.

ASTM A320 Grade B8 Same in every way as A193 Grade B8.

ASTM A354 Grade BC High strength bolts for normal atmospheric temperature. 125,000 tensile. Lacks alloying elements of B7.

ASTM A354 Grade BD These hex bolts are the same as BC except they have a higher strength.

ASTM A449 Similar to A354 except has Manganese added, 90,000 to 120,000 tensile strength depending on size.

hex bolt gr b7 - iwisu

ASTM A325 / ASTM A490
Head Type
Heavy Hexagonal Head
Material Grades Available
Type 1 - Medium Carbon Alloy Steel
Type 3 - Weathering Steel
Threading
Partial Thread or Full Thread
Dimensional Standards
ASME/ANSI B18.2.3.7
Nom. Sizes Available
Diameter: ½ inch – 1½ inches
Length: 1½ inches – 10 inches

ASTM A325

     
ASTM A490
     
Compatible Nuts
ASTM A194 / A563
Compatible Washers
ASTM F436 / F844

 

- ASTM A325M - ASTM A 490M HEX BOLT | BULONG IWISU

 

 

ASTM A325M / ASTM A490M
Head Type
Heavy Hexagonal Head
Material Grades Available
Type 1 - Medium Carbon Alloy Steel
Type 2 - Low Carbon Martensite Steel (For ASTM A490M only)
Type 3 - Weathering Steel
Threading
Partial Thread
Dimensional Standards
ASME/ANSI B18.2.3.7M
Nom. Sizes Available
Diameter: M16 – M36
Length: 45mm – 300mm

ASTM A325M

     
ASTM A490M
     
Compatible Nuts
ASTM A194M / A563M
Compatible Washers
ASTM F436M / F844

A193 Mechanical Properties

GradeSizeTensile ksi, minYield, ksi, minElong, %, minRA % 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

A193 Chemical Properties

ElementB7 (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%

A193 Recommended Hardware

Bolt GradeNutsWashers
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

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