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ASTM A320 L43 Stud bolt & Heavy Hex Nuts,A320 L7 Stud bolt

ASTM A320 L43 Stud bolt is normally applied for the stud bolt size over than  2 1/2″,which is used for low temperature applications.ASTM A320 Grade L43 is a standard material specification for alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for low temperature services. A320 L7 Stud bolt A320 L43 Stud bolt The mechanical and chemical makeup of both A320 Grades L7 and L43, is almost same,but the main difference is that the raw material used to make A320 L7 fasteners is typically 4140, whereas the raw material used to make A320 L43 is 4340.You may find the  ASTM A320 specification showing below. A320 Grades L7 Alloy steelAISI 4140/4142 Quenched and temperedL43 Alloy steelAISI 4340 Quenched and tempered A320 Mechanical…

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ASTM A320 L43 Stud bolt is normally applied for the stud bolt size over than  2 1/2″,which is used for low temperature applications.ASTM A320 Grade L43 is a standard material specification for alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for low temperature services.

The mechanical and chemical makeup of both A320 Grades L7 and L43, is almost same,but the main difference is that the raw material used to make A320 L7 fasteners is typically 4140, whereas the raw material used to make A320 L43 is 4340.You may find the  ASTM A320 specification showing below.

A320 Grades

L7 Alloy steelAISI 4140/4142 Quenched and tempered
L43 Alloy steelAISI 4340 Quenched and tempered

A320 Mechanical Properties

GradeSizeTensile, ksi, minYield, ksi, minCharpy Impact 20-ft-lbf @ tempElong, %, minRA, %, min
L7Up to 212125105-150° F1650
L43Up to 4125105-150° F1650

A320 Chemical Properties

ElementL7 (AISI 4140)L43 (AISI 4340)
Carbon0.37 – 0.49%0.38 – 0.43%
Manganese0.65 – 1.10%0.75 – 1.00%
Phosphorus, max0.035%0.035%
Sulfur, max0.040%0.040%
Silicon0.15 – 0.35%0.15 – 0.35%
Chromium0.75 – 1.20%0.70 – 0.90%
Nickel1.65 – 2.00%
Molybdenum0.15 – 0.25%0.20 – 0.30%

A320 Recommended Hardware

GradeNutsWashers
L7A194 Grade 4 or 7F436
L43A194 Grade 4 or 7F436

I. Strength Grades

DIN 931/933Grade 4.6, 4.8, 5.6, 5.8, 8.8, 10.9, 12.9
DIN 931/933SUS 304, 316
ASTM A307Grade A & B
ASTM A320, A320MGrade L7, L7M,L43, B8, B8M
ASTM A325, A325MGrade 8.8
ASTM A490, A490MGrade 10.9
ASTM A193/A193MGrade B7, B7M, B8, B8M, B16

ASTM A320 Grade L7 Stud bolts with two ASTM A194  Gr 7 nuts

ASTM A320 Grade L7M Stud bolts with two ASTM A194 Gr 7M nuts

Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service

ASTM Standards

A194/A194M Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both

F436/F436M Specification for Hardened Steel Washers Inch and Metric Dimensions

F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets

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
  2. 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

HOW to order our A320 L43 STUD BOLT,ASTM A194  Gr 7 HEX NUTS?

EXAMPLE#1,

3″ 980 mm STUD BOLT&NUTS, A320/A320M-L43, FULL-THREAD, 8-UN, ASME B18.2.1/B1.1 CL.2A/ A194/A194M-7M, WITH TWO HEAVY HEX. NUTS, ASME B18.2.2/B1.1 CL.2B, ZINC BASE COAT, FLUOROPOLYMER COATING, C/W TWO METALLIC WASHERS FLAT TYPE

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