We are a professional manufacturer of ASTM A320 Grade L7 Stud bolts in china, which has excellent resistance towards heat, corrosive medium and stress – corrosion cracking. Our ASTM A320 Grade L7 Alloy Steel Bolts are suitable to fulfill the needs of commercial as well as industrial needs like grills, infrastructure, grills and constructions. These ASTM A320 Grade L7 Alloy Steel Studs are contrived using top quality materials that are procured from reliable experts in the market, where our team work hard round the clock to fulfill the ever changing needs of our clients.
ASTM A320 L7 Stud bolt & Heavy Hex Nuts A194 Grade 4/7
ASTM A320 L7 Stud Bolts are specially designed for LOW temperature performance. These fasteners are commonly used for valves, flanges, fittings, and pressure vessels . ASTM specifications recommend a minimum Charpy impact value for ASTM A320 L7 Stud Bolts to be 20-ft-lbf @ -150F.
ASTM A320 Grade L7M Specifications
| Thread Diameters | : | M6 to M36 1/2-2 1/2″ |
| Threads Configuration | : | ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads |
| Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service | : | The ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature service. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings. Like the ASTM A193 specification, unless otherwise specified, the 8UN thread series is specified on fastener larger than 1” in diameter. |
ASTM A320 L7 STUD BOLT Chemical Properties
| Element | B7 (AISI 4140) | L7 (AISI 4140) |
| Carbon | 0.37 – 0.49% | 0.37 – 0.49% |
| Manganese | 0.65 – 1.10% | 0.65 – 1.10% |
| Phosphorus, max | 0.035% | 0.035% |
| Sulfur, max | 0.040% | 0.040% |
| Silicon | 0.15 – 0.35% | 0.15 – 0.35% |
| Chromium | 0.75 – 1.20% | 0.75 – 1.20% |
| Nickel | ||
| Molybdenum | 0.15 – 0.25% | 0.15 – 0.25% |
A320 L7 Stud bolt Mechanical Properties
| Grade | Diameter | Tensile, ksi, min | Yield, ksi, min | Charpy Impact 20-ft-lbf @ temp | Elong, %, min | RA, %, min |
|---|---|---|---|---|---|---|
| A320 L7 | Up to 21⁄2 | 125 | 105 | -150° F | 16 | 50 |
| A320 L43 | Up to 4 | 125 | 105 | -150° F | 16 | 50 |
Stud bolt Surface Treatments
- Plating
- Zinc (White / Yellow / Black)
- Cadmium (White / Yellow / Black)
- Zinc Nickel
- Galvanising
- Hot-Dipped Galvanise
- Mechanical Galvanise
- Fluorocarbon Coating
Xylan® / Dupont Coating Systems:- Xylar 2
- Xylan 1070
- Xylan 1424
- 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 L7 STUD BOLT,ASTM A194 Gr 7 HEX NUTS?
EXAMPLE#1,
1-5/8″-370mm STUD BOLT&NUTS, A320/A320M-L7M, 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