Stud bolts are the core fasteners of high-pressure flange connection systems. They are made of precision metal rods with threads at both ends and a threadless rod in the middle. They are specially designed for power fittings, power transmission and transformation equipment, optical cable communication towers and industrial pipeline systems, providing **high-strength, vibration-resistant, and fatigue-resistant** connection solutions to ensure the long-term sealing and structural integrity of key infrastructure under extreme working conditions.
1. Excellent load-bearing performance
Adopt **ASTM A193 B7/B7M, A320 L7/L7M** and other special alloy steels, with a tensile strength of 860~1040 MPa, and can withstand high temperature and high pressure environments.
2. Full thread precision meshing
The double-headed full thread structure achieves **balanced preload distribution**, eliminates unilateral stress concentration, and prevents flange leakage.
3. Super strong environmental adaptability
Optional **hot-dip galvanizing, Dacromet, stainless steel 316L** and other surface treatments, salt spray corrosion resistance > 1000 hours, suitable for harsh scenes such as coastal and chemical industries.
4. Zero-error installation guarantee
The light rod section accurately controls parallelism and straightness (≤0.05mm/m) to ensure flange surface alignment and eliminate the risk of eccentric loading.
Handan Jinmai implements the IATF 16949 quality management system to achieve full process control:
1. Raw material screening: Spectrometer verifies steel composition to ensure compliance with SAE/EN standards;
2. Cold forging: Multi-station cold heading machine forms the rod body in one step to retain the metal streamline strength;
3. Thread rolling: CNC thread rolling machine processes UN, METRIC, ACME and other threads, with a surface hardness of HRC 32-39;
4. Heat treatment strengthening: controlled atmosphere quenching + tempering, metallographic detection of grain size of more than 8 levels;
5. Surface protection: automatic hanging plating line achieves ≥50μm plating, passed ISO 9227 neutral salt spray test;
6. Laser marking: Permanently identify material grade and traceability code to support full life cycle management.
Material grade: carbon steel (4.8/8.8/10.9 grade), alloy steel (B7/B16/L7), stainless steel (A2-70/A4-80)
Diameter range: M6~M64 | 1/4"~2.5"
Length range: 30mm~2000mm (support non-standard customization)
Thread standard: ISO 898-1, ASME B1.1, DIN 975/976
Tensile strength: ≥800 MPa (8.8 grade)
Yield strength: ≥640 MPa
Elongation: ≥12%
Certification guarantee: CE, ISO 9001:2015, API 20E (for oil and gas)
As the core export product of Handan Jinmai Fastener Manufacturing Co., Ltd., our stud bolts integrate military-grade manufacturing standards and global compliance certification, and are specially designed to provide **zero-defect fastening solutions** for high-end fields such as power energy, communication infrastructure, and petrochemicals. Relying on fully automatic production lines and CNAS certified laboratories, we ensure that each product:
✅ Precisely match ASME/DIN/EN specifications
✅ 15-year anti-corrosion warranty
✅ Traceable original factory warranty report
Choosing Jinmai, you will get one-stop technical services from raw material screening to finished product delivery, empowering global engineering projects with safe and reliable connection value.
Official website: https://www.jinmaipowerline.com/
Email: [email protected]
Contact: WhatsApp/wechat: +86 13831001495
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