ASTM A193 B7M Stud bolts with A194 2HM Heavy Hex Nut
We produce high quality of ESPARRAGOS STUD BOLT A193 Grado B7M w/2 Hex NUTS A194 2HM ,A193 B7M Stud bolt and A194 2HM nuts ASME B18.2.1, B18.2.3.6M and B18.2.3.7M dimension standards.A193 B7M Stud bolts with A194 2HM Heavy Hex Nut in China
We also can produce PTFE coated A193 B7M Stud bolt and A194 2HM nuts
Xylan 1070/xylan 1424 blue coated A193 B7M Stud bolt and A194 2HM nuts
A193 Grade B7M Stud Bolts are manufactured from AISI 4140/4142 low Carbon Alloy Steel Grades followed by quencing & tempering. We manufacture these Bolts with great precision & Quality.
FULLY THREADED STUD BOLT
TYPE OF THREAD: UNC, 8 TPI
TYPE, NUT: HEAVY HEXOGONAL
DESIGN SPEC, NUT: ASME / ANSI B18.2.2 HEX NUTS
DESIGN SPEC, STUD BOLT: ASME / ANSI B18.2.1 STUD BOLT
DESIGN SPEC, THREAD: ANSI B1.1
THREAD CLASS SYMBOL, NUT: 2B
THREAD CLASS SYMBOL, STUD BOLT: 2A
Material: ASTM A193 Grade B7M
A194 2H Hex Nut Chemical Components %
| C | Mn | Ph | S | Si |
|---|---|---|---|---|
| 0.40 min | 1 | 0.04 | 0.05 | 0.4 |
A194 2H Hex Nut Mechanical Properties
| Size | TemperingTemp
Fahrenheit |
Proof LoadStress, ksi | Hardness |
|---|---|---|---|
| 1/4-1 1/2 | 850 | 175 | 248-327 |
| 1 1/2-4 | 850 | 175 | 212-327 |
(A) Studs
|
I. Strength Grades
| DIN 931/933 | Grade 4.6, 4.8, 5.6, 5.8, 8.8, 10.9, 12.9 |
| DIN 931/933 | SUS 304, 316 |
| ASTM A307 | Grade A & B |
| ASTM A320, A320M | Grade L7, L7M, B8, B8M |
| ASTM A325, A325M | Grade 8.8 |
| ASTM A490, A490M | Grade 10.9 |
A 193 A193M B7M with two ASTM A194 2HM nuts
DIN, ASTM, JIS, BS, ISO, AS/NZS
ASTM A193 This specification covers alloy steel and stainless steel bolting material for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications
| ASTM A193 B7 | Alloy steel AISI 4140/4142 quenched and tempered |
|---|
IV. Surface Treatments
-
- Plating
- Zinc (White / Yellow / Black)
- Cadmium (White / Yellow / Black)
- Zinc Nickel
- Plating
-
- Galvanising
- Hot-Dipped Galvanise
- Mechanical Galvanise
- Galvanising
-
- Fluorocarbon Coating
Xylan® / Dupont Coating Systems:- Xylar 2
- Xylan 1070
- Xylan 1424
- Fluorocarbon Coating
- Customised Coating Systems
- Zinc + Fluorocarbon / PTFE coated stud bolt
- Cadmium + Fluorocarbon /PTFE coated stud bolt
- Zinc Nickel + Fluorocarbon /PTFE coated stud bolt
- Zinc Plating + Xylan 1424 Blue PTFE coated stud bolt
- Xylar 2 + Xylan 1070 coated stud bolt
| 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 |
| B16 | A heat-treated chromium-molybdenum-vanadium steel for high-pressure, high-temperature service. |
Mechanical Properties
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 | |
| B16 | Up to 2-1/2 | 125 | 105 | 18 | 50 |
| 2-5/8 – 4 | 110 | 95 | 17 | 45 | |
| 4-1/8 – 7 | 100 | 85 | 16 | 45 |
Material Chemical Composition
| Element | A193 B7 (AISI 4140) | B8 (AISI 304) | B8M (AISI 316) | B16 (AISI 4140) |
|---|---|---|---|---|
| Carbon | 0.37 – 0.49% | 0.08% max | 0.08% max | 0.37 – 0.49% |
| Manganese | 0.65 – 1.10% | 2.00% max | 2.00% max | 0.65 – 1.10% |
| Phosphorus, max | 0.035% | 0.045% | 0.045% | 0.035% |
| Sulfur, max | 0.040% | 0.030% | 0.030% | 0.040% |
| Silicon | 0.15 – 0.35% | 1.00% max | 1.00% max | 0.15 – 0.35% |
| Chromium | 0.75 – 1.20% | 18.0 – 20.0% | 16.0 – 18.0% | 0.75 – 1.20% |
| Nickel | 8.0 – 11.0% | 10.0 – 14.0% | ||
| Molybdenum | 0.15 – 0.25% | 2.00 – 3.00% | 0.15 – 0.25% |
Recommended Nuts,Bolts & Washer
| 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 |
| Mechanical Property | Statistic | (Max/Min) |
|---|---|---|
| Ultimate Tensile Strength (UTS) | 860 MPa | (minimum) |
| 0.2% Proof Stress | 720 MPa | (minimum) |
| Elongtion | 16% | (minimum) |
| Hardness (Brinell) | A4D 321 HB | (maximum) |
| Hardness (Rockwell C) | 35 HRC | (maximum) |
Heat Treatment; Minimum tempering temperature: 593 degs C.
Uses
A193 B7M stud Bolt and A194 2HM nuts for pressure vessels, valves, flanges and fittings for high temperature or high pressure services, or other special purpose applications.
| DESCRIPTION | MATERIAL | DIMENSION | RANGE | ||
|---|---|---|---|---|---|
| Inch | Metric | ||||
| BOLT | STUD BOLT | A193,A320, A437,4449,4453,ISO 898-1 | A193,A307,A540, A564 | 1/4″ ~ 6″ | M6-M160 |
| HEX BOLT | A193,A320,A437,A449,4453,ISO 898-1 | ASME B18.2.1 / ANSI B18.2.3.5M | 1/4″ ~ 6″ | M5-M160 | |
COATING
| DESCRIPTION | SPECIFICATION | MATERIAL |
|---|---|---|
| HOT-DIP GALVANIZED | ASTM 123, ASTM A153, ISO 10684 | IRON AND STEEL PRODUCT IRON AND STEEL HARDWARE FASTENERS |
| ELECTRO-DEPSITER | ASTM B633 , ASTM B766 ISO 2081, ASTM B841 | ZINK, CADMIUM , ZN+NI |
| NON-ELECTRONICALLY ZINK FLAKE | ISO 10683 | ZINK |
| ZINK PHOSPHATE | ASTM F1137, ISO 11408 | ZN / MN |
| PTFE (Poly Tetra Fluoro Ethyene) | XYLAN 1070, 1052, 1014, 1424 XYLAR 2, SERMAGARD 1105/1280 |
XYLAN |
STAINLESS STEEL
| DESCRIPTION | MATERIAL |
|---|---|
| Martensitic | 403,410,410S, 410JI , 416, 420JI , 420J2 , 420F, 431, 440A, 440B , 440C |
| Ferritic | 405, 429, 430, 430F , 434 |
| Austenitic | 201, 202, 301, 302, 303, 303Se, 304, 304L, 304N1, 304N2,305, 305J1 , 3095, 310S, 316, 316N , 316L, 316JI , 16JIL , 317, 317L , 321, 347, 384 , XM7 , XM15JI , 329JI |
DUPLEX ALLOY
| MATERIAL | MATERIAL | ASTM |
|---|---|---|
| ALLOY 2205 – DUPLEX 2205 | S31803, S32205 | A182, A76, A479 |
| ALLOY 2507-25Cr | S32750, S32760 | A182, A76, A479 |
TITAIUM
| MATERIAL | UNS | ASTM |
|---|---|---|
| TITAIUM Gr. 2/5/7 |
R50400, R56400, R52400 | B348, B265 |
6%-MOLY
| MATERIAL | UNS | ASTM |
|---|---|---|
| ALLOY 2205 – DUPLEX 2205 | N08925, N08926 , N08367 | ASTM B649, A182, A276, A479, B688 |
| ALLOY 2507-25Cr | S31254 | A182, A276 , A479 |
NICKEL ALLOYS
| MATERIAL | UNS | ASTM |
|---|---|---|
| ASTM A453 Gr 660 Class A/B/C/D | S66286 | ASTM B649, A182, A276, A479, B688 |
| HASTELLOY C276 | N10276 | B574 , B622 |
| INCOLOY A286 / 800 / 800H / 825 / 925 | S66286, No8800, N08810, N08825, NO9925 | A453 , B407, B408, B564, B423, B425 , B805 |
| MONEL 400 / 5500 | N04400, N05500 | B164 , B865 |
| INCONEL 625/ 718/ 750 | N006625, N07718, N07750 | B446, B564 A1014 , B637 |
difference between ASTM A193 B7M stud bolts and ASTM A320 L7M Stud Bolts
There has been much concern among users trying to know the difference betweem B7M and L7M materials. These materials are highly popular when they require the bolts and nuts to be compliant with NACE 0175. Popular with Xylan 1070 coating, Xylan 1424 PTFE blue coating
ASTM A193 B7M stud bolt, being under the A193 standards, fall under the Standard Specification for Alloy Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Application
ASTM A320 L7M, being under the A320 standards, fall under the Standard Specification for Alloy Steel and Stainless Steel Bolting for Low Temperature Service.
What is the difference between A193 Grade B7 & A193 Grade B7M stud bolt?
A193 B7M stud bolt has a minimum tensile strength of 100 ksi for diameters under 4”. The minimum tensile strength for A193 B7 stud bolt is 125 ksi for diameters under 2-1/2”, and 115 ksi for 2-1/2” – 4” diameter. Hardness is probably the most significant difference between A193 B7M & A193 B7. The maximum hardness of ASTM A193 B7M is 235 HB or 99 HRB, while the maximum hardness of A193B7 is 321 HB or 35 HRC. The most notable difference from a manufacturing perspective is that when providing A193B7M sutd bolts, every individual bolt or stud in the lot must be hardness tested. A193 B7M stud bolt will also require a different grade of heavy hex nut than A193 B7, which would be ASTM A194 Grade 2HM.
HOW TO ORDER OUR A193 B7M STUD BOLTS?
EXAMPLE#1,
1-7/8″-450mm STUD BOLT&NUTS, A193/A193M-B7M, FULL THREAD, 8-UN, ASME B18.2.1/B1.1 CL.2A/ A194/A194M-2HM, WITH TWO HEAVY HEX. NUTS, ASME B18.2.2/B1.1 CL.2B C/W TWO METALLIC WASHERS ASTM F436 FLAT TYPE
