Threaded Half‑Coupling
Our forged threaded half‑coupling is a single‑end internally‑threaded pipe fitting with a solid‑closed bottom. Manufactured strictly following ASME B16.11 and MSS SP‑79 standards, all sizes maintain full nominal dimension without minus tolerance, widely used for instrument, hydraulic, fire‑fighting and chemical high‑pressure small‑bore pipeline end closure.
Overview
Threaded Half‑Coupling also known as threaded end cap, is one‑piece hot‑forged fitting with internal NPT taper thread on one side and solid closed‑end on the other side. It is welded onto the main pipe wall for branch port sealing or short‑threaded connection. Different from full‑coupling, only one end is threaded, which is widely used for reserved instrument ports and temporary‑closed pipeline branches.
We adopt hot‑forging plus CNC precision thread‑machining process. Available materials include carbon‑steel A105 and stainless‑steel A182‑F304 / F316L. Internal threads are precisely machined following American NPT standard for leak‑proof connection. We strictly control wall‑thickness and thread dimension, guarantee zero minus‑tolerance without thin‑wall cutting‑corners. Three pressure classes: Class3000, Class6000, Class9000 for different high‑pressure working conditions.
Core Key Features
- Integral hot‑forged forming, thick‑wall structure, outstanding pressure‑resistance and mechanical strength.
- Single‑end internal NPT thread with solid closed‑bottom for pipeline‑end sealing.
- Precision CNC‑machined thread for stable sealing under high‑pressure working environments.
- Available raw‑materials: Carbon‑Steel A105; Stainless‑Steel A182‑F304 / F316L.
- Compliant with global standards ASME B16.11 and MSS SP‑79 for high‑pressure forged fittings.
- Complete size range: 1/8″‑4″ (DN6 ~ DN100), support NPT, BSPT, BSPP thread options.
- Zero minus‑tolerance on wall‑thickness and thread dimension, full‑standard nominal size.
- MPI magnetic‑particle inspection and hydro‑static pressure test before shipment, complete MTC material certificates provided.
Technical Specification
| Item | Technical Parameter |
|---|---|
| Product Name | Threaded Half‑Coupling / NPT Threaded End Cap |
| Connection Type | Single‑End Internal NPT Taper Thread (Optional BSPT, BSPP) |
| Production Craft | Hot‑Forged + CNC Precision Thread Machining |
| Executive Standard | ASME B16.11, MSS SP‑79 |
| Available Materials | A105 Carbon Steel; A182‑F304 / F316L Stainless Steel |
| Pressure Class | Class3000, Class6000, Class9000 |
| Size Range | 1/8″‑4″ (DN6 ~ DN100) |
| Structure Feature | One‑side internal thread, the other end solid closed |
| Dimensional Tolerance | Full‑standard nominal size, zero minus tolerance |
| Inspection Items | MPI Magnetic Particle Test, Hydrostatic Test, Thread Dimension Inspection |
| Surface Treatment | Black Anti‑Rust Paint (Carbon Steel); Pickling & Passivation (Stainless‑Steel) |
Applications
- Power‑plant instrument reserved threaded port sealing
- Petro‑chemical high‑pressure pipeline idle‑branch closure
- Hydraulic‑equipment pressure‑port short‑connection
- Fire‑protection small‑bore pressure‑pipeline end‑plugging
- Off‑shore platform anti‑corrosion instrument piping
- Food & pharmaceutical stainless‑steel process‑pipeline
- Oil‑gas field measuring‑instrument auxiliary‑piping
Why Choose Our Threaded Half‑Coupling
- Direct forged‑fitting factory supply, regular sizes in‑stock with competitive factory ex‑works price.
- All threaded half‑couplings adopt full‑standard dimensions with zero minus‑tolerance, never use thinner raw‑materials to cut costs.
- Custom thread types (NPT / BSPT / BSPP), body length and surface treatment are available per customer drawings.
- Strict whole‑process quality‑inspection, full‑set export‑certificates for customs clearance.
- Fast delivery within 7‑15 working days for standard stock items.
- Export wooden‑case packaging to avoid rust, scratch and deformation during long‑distance sea‑transportation.
