Product Specification

Stainless steel round nuts, chemical instrument locking screws, precision hardware accessories

Application Scenarios and Characteristics of Stainless Steel Through‑Hole Adjusting Nuts in Chemical Equipment

1. Core Application Scenarios in Chemical Equipment

1.1 Pressure Vessels & Reactors

• Shell and head connection: Used for fastening and clearance adjustment of pressure vessels, reactors, heat exchangers and storage tanks. Through holes facilitate bolt penetration and alignment.
• Flange assembly: Positioning and pre‑tightening of pipe flanges, equipment flanges and manhole covers, ensuring sealing performance under pressure and temperature changes.
• Internal component fixing: Adjustment and installation of trays, baffles, supports and catalyst holders inside reactors and towers.

1.2 Piping & Valve Systems

• Pipeline supports and hangers: Adjustment and fixation of chemical pipelines, ensuring stability under thermal expansion and vibration.
• Valve actuators: Installation and position adjustment of ball valves, gate valves, check valves and control valves.
• Pump and compressor bases: Leveling, alignment and anti‑vibration fastening for chemical pumps, compressors and mixing equipment.

1.3 Filtration, Separation & Drying Equipment

• Filter housings and centrifuge components: Adjustment and sealing for pressure‑resistant structures.
• Dryer and crystallizer parts: Fastening with high corrosion resistance and thermal stability.

1.4 Environmental & Waste Treatment Equipment

• Waste gas scrubbers, absorption towers and wastewater treatment devices: Suitable for strong acid, alkali and salt corrosion environments.
• Skid‑mounted chemical units: Module connection, leveling and structural adjustment.

2. Core Product Characteristics (Adapted to Harsh Chemical Conditions)

2.1 Material and Corrosion Resistance (Core Advantage)

• Main materials: SUS316 / 316L (priority), SUS304; duplex stainless steel (S32760, etc.) for strong acid, alkali and chloride environments.
• Corrosion resistance: 316 with molybdenum provides excellent resistance to pitting, crevice and stress corrosion. Salt spray test ≥ 1200 hours.
• Surface treatment: Pickling passivation, electrolytic polishing to form a dense passive film for enhanced corrosion resistance.

2.2 Structural and Functional Features

• Through‑hole design: Full through or stepped holes for easy bolt insertion, shaft penetration and alignment.
• Adjustment function: Cooperate with screws or bolts to achieve axial / radial fine adjustment, compensating for installation tolerance, thermal expansion and deformation.
• Reliable anti‑loosening: Used with lock washers, thread locking compound or double nuts to resist vibration and pressure pulsation.
• Precision matching: Thread accuracy 6H, through holes per GB/T5276 / GB/T5277, balancing assembly convenience and connection stability.

2.3 Mechanical and Environmental Adaptability

• Strength grade: A4‑70 / A4‑80, tensile strength ≥ 700MPa, meeting pressure and load requirements of chemical equipment.
• Temperature range: -60℃ ~ 300℃, suitable for high‑temperature reaction systems and low‑temperature working conditions.
• Maintenance‑friendly: Not easy to rust or scale, reducing replacement and maintenance costs in the whole life cycle.

3. Sto Flexible Production Process (Optimize Cost‑Performance by Quantity)

3.1 Process Route Selection (Flexible Switching by Batch)

• Large batch (≥100,000 pcs): Multi‑station cold heading + tapping + through‑hole drilling
   
  • Advantages: high efficiency, material utilization ≥ 85%, low cost, stable consistency.
  • Application: standard sizes M6~M36 for general chemical equipment.
   
• Medium & small batch (10,000~100,000 pcs): Bar / tube CNC turning + drilling + tapping
   
  • Advantages: fast model change, low mold cost, suitable for non‑standard structures.
   
• Small batch / customization (<10,000 pcs): CNC precision machining + custom through holes / threads
   
  • Advantages: high flexibility, meeting special dimensions, materials and surface treatment requirements.
   

3.2 Key Process Optimization

• Graded material selection: Select 304 / 316 / duplex steel according to corrosion level, avoid over‑design; match strength grade based on working load.
• Process integration: Integrated cold heading + drilling + tapping; automatic turning to reduce clamping and handling.
• Intelligent inspection: CCD vision, thread measurement, salt spray test to meet chemical equipment standards.
• Surface treatment coordination: Unified passivation / electrolytic polishing for mass production; customized treatment for special orders.

3.3 Cost‑Performance Improvement Path

• Scale effect: Large‑batch cold heading reduces unit cost by 30%~50%.
• Material utilization: Cold heading reduces material loss by more than 50% compared with machining.
• Delivery guarantee: Flexible process supports urgent orders and long‑term projects.
• Stable quality: Automated production + full inspection reduce after‑sales and rework costs.

We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.

Our maximum processing outer diameter is 60, and the minimum control tolerance is 0.001. We have Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment, which can effectively provide customers with the best technical solutions.

Our company has a total of 300 employees, including 20 technicians, 10 engineers, and 15 quality control personnel. We have over 300 pieces of equipment.

Our company implements 8S management and has passed ISO9001 and TS16949 automotive certifications.

Our customers include , bo-sch, Foxconn, Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar.