A193 B7 Threaded Rod
A193 B7 Threaded Rod
ASTM A193 Grade B7 threaded rodformarine pipingandflange connections. Continuous full-length thread in sizes M6 to M72 (1/4"to 3"), cut to customer-specified length. Heat treated per ASTM A193 Grade B7 requirements with minimum tensile strength of 860 MPa. All products supplied with EN 10204 3.1 material certificates and full chemical/mechanical traceability. Products comply with marine classification society requirements and are available for third-party inspection (DNV, ABS, LR, CCS).
What Is an A193 B7 Threaded Rod?
AnA193 B7 threaded rod (also known as all-thread or fully threaded rod) is a continuous-length steel bar with thread running the full length. Unlike stud bolts which have two threaded ends with an unthreaded body, threaded rods are designed to be cut to any required length on site, making them ideal for marine piping installations where exact lengths may vary.
ASTM A193 Grade B7 is a chromium-molybdenum alloy steel, heat treated by quenching and tempering. Per ASTM A193 Table 1, it provides a minimum tensile strength of 860 MPa for sizes up to M48 (2") and 725 MPa for sizes above M48. Grade B7 is the standard material for high-temperature and high-pressure piping systems, widely used in marine engine rooms, boiler rooms, and auxiliary piping.
Marine Applications
Note: The following applications are based on typical industry practice for ASTM A193 B7 threaded rods in marine piping environments. Specific material selection should be confirmed with the vessel's classification society requirements.
| Application | Typical Size | Service Condition |
|---|---|---|
| Flange connection supports | M12-M36 | High-pressure piping |
| Engine room pipe hangers | M10-M24 | Vibration + heat |
| Boiler room structural bracing | M16-M48 | High temperature |
| Auxiliary piping supports | M10-M30 | Moderate pressure |
| U-bolt and clamp assemblies | M8-M20 | Pipe clamping |
Specifications & Materials
| Parameter | Range | Standard Reference |
|---|---|---|
| Standard | ASTM A193 Grade B7 | ASTM A193 |
| Product Type | All-thread rod (continuous full-length thread) | ASTM A193 |
| Size Range | M6 – M72 (1/4"– 3") | ASTM A193 Table 1 |
| Length | 1m – 6m (cut to order) | per customer specification |
| Thread | Metric / UNC / UNF | ASME B1.13M, ASME B1.1 |
| Material | Cr-Mo alloy steel, quenched & tempered | ASTM A193 Grade B7 |
| Min Tensile Strength | 860 MPa (≤M48); 725 MPa (>M48) | ASTM A193 Table 1 |
| Min Yield Strength | 725 MPa (≤M48); 585 MPa (>M48) | ASTM A193 Table 1 |
| Finish | Plain, Black Oxide, Zinc Plated, HDG | per industry practice |
| Inspection | EN 10204 3.1 Certificate; Third-party available | EN 10204 |
Why Choose sinofastener for A193 B7 Threaded Rods?
① Full size range: M6 to M72 in stock and made-to-order. Custom lengths cut to your exact specification with deburred ends.
② Marine-grade traceability: Every batch supplied with EN 10204 3.1 mill certificates, chemical composition reports, and mechanical test results per ASTM A193.
③ Classification compliance: Products meet marine classification society requirements (DNV, ABS, LR, CCS). Third-party inspection available before shipment.
④ Annual capacity 50,000 tons: Integrated production and trading capability ensures competitive pricing and reliable delivery for all marine piping fastener orders.
Standards Reference
- ASTM A193 — Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service
- ASTM A194 — Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service (matching nut standard)
- EN 10204 — Metallic Products — Types of Inspection Documents (3.1 Certificate)
- ASME B1.13M — Metric Thread Standard
- ASME B1.1 — Unified Inch Screw Threads
FAQ
Q: What is the difference between a threaded rod and a stud bolt?
A: A threaded rod has continuous thread along its full length and can be cut to any size on site. A stud bolt is a pre-cut length with two threaded ends and an unthreaded body section, designed for specific flange assemblies. Per ASTM A193, both are available in Grade B7, but their applications differ — threaded rods are more flexible for piping support work.
Q: What nuts should be used with A193 B7 threaded rods?
A: Per ASTM A193, Grade B7 bolting is typically paired with ASTM A194 Grade 2H nuts for high-temperature service. For marine piping applications, this combination is the industry standard.
Q: Can A193 B7 threaded rods be used in seawater service?
A: ASTM A193 Grade B7 is a chromium-molybdenum alloy steel with moderate corrosion resistance. For direct seawater contact, stainless steel (ASTM A193 B8/B8M) or duplex stainless steel grades are recommended. Grade B7 is best suited for piping system supports, structural bracing, and high-temperature zones where corrosion exposure is limited.
Contact Us
Email: sales@sinofastener.com | bobo@sinofastener.com
Tel: 0574-86592068
Website: www.zlfastener.com | www.sinofastener.com (Main)
