One-stop service for hot galvanized seamless steel pipe: double-end external threading, blue plastic end cap protection, custom drilling & slotting, hot-dip galvanized anti-corrosion, logo spray marking, steel strap bundling, wooden case/carton packing. All pipe end machining and export packaging finished domestically, compliant with international pipeline standards for fire, water, construction piping.

We supply premium hot-dipped galvanized seamless steel pipes with comprehensive customized end finishing and full packaging services. All machining and surface treatments are processed strictly in-house, meeting international piping standards such as ASTM A53, JIS, EN standards, suitable for fire protection, water supply, construction, pipeline engineering and industrial fluid transportation.

Detailed Processing Services for Seamless Steel Pipes

1. Pipe Threading (Both Ends Turning Thread / Pipe Chasing)
Professional CNC lathe threading service for both pipe ends.
Process: Precision turning external threads on two ends of seamless pipes. Thread types include NPT, BSP, BSPT, R thread, metric threads, customizable thread length and pitch.
Advantages: Uniform thread teeth, smooth surface, tight fit with fittings, no burrs, good sealing after connection. Perfect for threaded pipe connection projects.

2. Plastic Pipe End Caps / Blue Plastic Protective Caps
Matched blue plastic end caps for threaded pipe ports.
Function: Cover both pipe ends fully to protect external threads from collision, scratch, rust, dust and debris during shipping and storage.
Features: Tight plug fit, waterproof and dustproof, reusable, widely used on bundled galvanized steel pipes as shown in photos.

3. Pipe Drilling Service
Custom precision drilling on pipe bodies according to customer drawings.
Available work: Round hole drilling, multi-hole positioning drilling, staggered hole drilling, fixed-size hole opening. We control hole position accuracy, hole diameter tolerance and avoid pipe wall deformation.
Common usage: Branch pipeline diversion, pipeline installation fixing, drainage and ventilation pipelines.

4. Pipe Slotting / Grooving Service
Custom longitudinal slotting and circumferential grooving on seamless tubes.
Capable of linear slot cutting, annular groove machining for clamp connection, mechanical assembly. Groove depth, width and length fully customizable to match coupling, clamp and mechanical installation requirements.

5. Hot-Dip Galvanizing Treatment
Full hot-dipped galvanization for whole seamless pipes.
Technology: Immerse finished steel pipes in molten zinc for hot galvanizing, forming a thick zinc coating on inner and outer pipe surfaces.
Benefits: Outstanding anti-rust, anti-corrosion performance, resistant to humid, outdoor, underground and corrosive environments, greatly extending pipeline service life.

6. Sprayed Marking / Pipe Logo Printing
Surface spray marking service on galvanized pipe outer wall.
Spray permanent content including pipe specification, outer diameter, wall thickness, steel grade, standard (ASTM A53, etc.), batch number, manufacturer logo, production date. Clear, wear-resistant spray words for easy identification during delivery and construction.

7.Packaging & Shipment Services
1）. Bundling & Strapping Packing
Standard bundling packing: Organize pipes into neat bundles with steel strapping. All bundled pipe ends are covered with blue plastic caps. Bundles are arranged orderly, stable and compact, preventing shifting and damage in transit. It is the most common packing way for bulk galvanized threaded pipes.
2）. Wooden Case / Carton Container Packing
Optional wooden box or export carton packing for small-size pipes and high-precision threaded pipes.
Protect pipes from impact in long-distance ocean/land transportation; ideal for LCL shipment, small batch orders and high-value projects.

Our Advantages of One-Stop Processing
All procedures including threading, cap fitting, drilling, slotting, galvanizing, marking, packing are finished in our factory, no outsourced processing, stable quality control.
Support customization based on drawings: thread parameters, hole size, slot dimension, printing content and packing methods are adjustable.
Strict dimensional inspection for threads, holes and grooves; zinc layer thickness tested to guarantee anti-corrosion quality.
Flexible order range: mass bulk orders and small trial orders both acceptable, supporting OEM & ODM.

Welcome to send us your pipe drawings and technical requirements. We provide full-set seamless pipe machining, surface treatment and export packaging solutions with competitive factory prices and on-time delivery.