Threaded Hex Head Pipe Plug

Our forged hex‑head threaded pipe plug is precision‑machined with NPT external tapered thread for sealing threaded pipe openings. Produced strictly following ASME B16.11 and MSS SP‑79 standards, all sizes maintain full nominal dimension without minus tolerance, widely used to close unused ports for power, hydraulic, fire‑fighting and chemical high‑pressure piping systems.

Overview

Hex‑Head Threaded Plug is one‑piece hot‑forged pipe fitting with external NPT taper thread and hexagonal top. The hex‑shaped head allows wrench installation and removal. It is screwed into internal threaded openings to block idle branch connections, prevent medium leakage, dust and corrosion inside pipelines.

We manufacture threaded plugs by hot forging followed by precise CNC thread machining. Available materials include carbon‑steel A105 and stainless‑steel A182‑F304 / F316L. Thread profile strictly complies with American NPT standard. We control wall‑thickness and thread size strictly, guarantee zero minus‑tolerance without thin‑wall cutting‑corners. Three pressure classes Class3000, Class6000, Class9000 are available for different high‑pressure working conditions.

Core Key Features

Integral hot‑forged forming, high mechanical strength and outstanding pressure‑resistance.
Hex‑head design for easy wrench tightening and disassembly during maintenance.
Precision‑cut NPT taper external thread for tight self‑sealing performance under high‑pressure.
Available raw‑materials: Carbon‑Steel A105; Stainless‑Steel A182‑F304 / F316L.
Compliant with global standards ASME B16.11 and MSS SP‑79 for forged high‑pressure fittings.
Full‑size range: 1/8″ ~ 4″ (DN6‑DN100), supports 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 Hex‑Head Pipe Plug / NPT Hex Plug
Connection Type	External 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	Hex‑Head for wrench installation
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

Our forged threaded hex‑head plugs are essential fittings for small‑bore high‑pressure threaded piping systems:

Power‑plant instrument unused threaded port sealing
Petro‑chemical high‑pressure pipeline idle branch closure
Hydraulic‑equipment pressure‑port blocking
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 Hex‑Head Plug

Direct forged‑fitting factory supply, regular sizes in‑stock with competitive factory ex‑works price.
All pipe plugs adopt full‑standard dimensions with zero minus‑tolerance, never use thinner raw‑materials to cut costs.
Custom thread types (NPT / BSPT / BSPP), special sizes and surface treatment are supported as per 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.

FAQ

Q1: What is a hex‑head threaded pipe plug used for?

A: Hex‑head NPT plug is screwed into female threaded openings to seal unused pipeline branches, prevent fluid leakage and dirt from entering the pipe system.

Q2: Do your threaded pipe plugs have minus‑tolerance on wall‑thickness?

A: All our forged pipe fittings are strictly manufactured to full‑nominal standard dimensions. We guarantee zero minus‑tolerance on wall‑thickness and thread sizes without thin‑wall cutting‑corners.