ASME SA193 SA193M B7M Stud bolts with A194 2HM Heavy Hex Nut

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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

 

ASME SA193 SA193M B7M Stud bolts with A194 2HM Heavy Hex Nut

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
  • Threaded Rod / Stud

 

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

    1. Plating
      • Zinc (White / Yellow / Black)
      • Cadmium (White / Yellow / Black)
      • Zinc Nickel
    1. Galvanising
      • Hot-Dipped Galvanise
      • Mechanical Galvanise
    1. Fluorocarbon Coating
      Xylan® / Dupont Coating Systems:

      • Xylar 2
      • Xylan 1070
      • Xylan 1424
  1. 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.

Xylan 1424 coated stud bolt

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

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