Stainless Steel Pipe Fittings SS304 SS316 3/4'' Cap for Pipeline System

Product Description

The stainless steel cap is a fundamental pipe fitting used to securely close and seal the open end of a piping system, and our premium stainless steel cap is manufactured from high grade 304 or 316L stainless steel to provide outstanding resistance against corrosion, oxidation, and chemical attack—ensuring that every stainless steel cap maintains its integrity even in marine, acidic, or high humidity environments. With precision cut threads this stainless steel cap can be easily installed onto matching pipe ends or fittings, and the tapered thread design of each stainless steel cap guarantees a leak tight seal under pressures up to PN40 or Class 300, making our stainless steel cap suitable for water, oil, gas, steam, and aggressive fluid services. Offered in sizes ranging from 1/8″ to 4″ and in multiple lengths and wall thicknesses, the stainless steel cap accommodates both standard and custom piping specifications, while a reducing type stainless steel cap is also available for closing smaller diameter branches. The surface of every stainless steel cap is passivated and electropolished to a smooth, low roughness finish, which not only enhances corrosion resistance but also minimizes product buildup—a critical feature when the stainless steel cap is used in food processing, pharmaceutical, or ultrapure water lines, where cleanliness is paramount. Installation of this stainless steel cap requires no special tools, and the optimized thread engagement ensures that the stainless steel cap can be tightened quickly without galling or over stressing, saving valuable labor time on site. From petrochemical refineries and power plants to municipal water treatment and HVAC systems, our stainless steel cap has proven its durability in countless field applications; in high chloride seawater cooling systems, the 316L version of the stainless steel cap exhibits exceptional pitting resistance that far exceeds that of ordinary carbon steel caps.  Although the initial purchase price of a stainless steel cap may be slightly higher than that of coated carbon steel alternatives, its virtually maintenance free service life and zero leakage reliability dramatically lower total lifecycle costs—often by more than 40%—making our stainless steel cap the most economical choice for long term pipeline closure. 

Product Advantages

Why Choose Our Stainless Steel Cap?

6 core advantages of SXBHMS Malleable Iron Pipe Fittings — proven by global buyers from Europe, America, Southeast Asia and Middle East.

1. ASTM A197 Raw Material

2. 50+ Years Anti-Corrosion

3. CNC Precision Thread

Full graphitization annealing — great toughness, anti-impact, no brittle cracking under pipeline pressure.

Hot-dip galvanized finish forms compact zinc alloy layer — resists rust, acid and moisture over 50 years.

NPT/BSP/ISO7 machined — uniform tooth pitch, tight seal, no leakage or thread slipping.

4. Full Size Range

5. No Welding Required

6. 100% Pressure Tested

3/8"×1/4" up to 4"×3" · DN10×DN8 to DN100×DN80. All diameter transitions covered.

Threaded connection with a pipe wrench — shortens construction period and lowers labor cost.

Every batch passes hydraulic test + dimension + thread inspection before shipment.

Product Detail Images

Concentric integrated casting · Double female inner thread · Beaded & plain edge options.

Specification

Standard parameters for reference — custom sizes and thread standards available on request.

Item	Specification
Product Name	Stainless Steel Cap
Raw Material	Stainless Steel
Production Standard	ANSI B16.3 · EN10242 · BS EN10242 · DIN2950
Thread Standard	NPT · BSP · ISO7/1 · DIN2999
Surface Treatment	Smooth
Working Pressure	Class 150: 300 PSI  |  Class 300: 1000–2000 PSI
Working Temperature	-29°C ~ +120°C
Available Sizes	3/8"×1/4" ~ 4"×3"  |  DN8×DN6 ~ DN100×DN80
Certification	ISO 9001
MOQ	Negotiable — small trial order accepted
Lead Time	Approx. 10 working days (standard sizes)
OEM / Custom	Thread standard · Special size · Logo · Surface finish

Common Size Combinations

Application Scenarios

Widely used in fire protection, water supply, gas, HVAC, industrial and agricultural pipeline systems.

Fire Protection

Water Supply

Natural Gas Pipeline

Core fitting for sprinkler diameter transitions — UL/FM certified.

Residential & commercial plumbing — safe for drinking water systems.

NPT thread for reliable gas-tight sealing in industrial lines.

HVAC & Heating

Industrial Factory

Agricultural Irrigation

High-temp resistant — radiator and steam pipe transitions.

Oil, compressed air & chemical liquid pipelines.

Cost-effective bulk supply for farm irrigation systems.

Market Feedback

    We have ordered malleable iron fittings & grooved fire pipe fittings for 4 consecutive years. Stable batch quality, zero leakage after installation, perfectly suit high-temperature working conditions. Always on-time delivery, very reliable long-term partner.

From Ahmed Khalid · Saudi Arabia · Jan.2026

    High pressure forged pipe fittings meet strict ASME standards. Full MTR & NDT test reports provided. Great pressure resistance, very safe for harsh chemical pipeline projects. Professional size matching service saves us a lot of trouble. 

From David Miller · USA · Mar.2026

    Complete stainless steel threaded fittings, nipples, flanges and thread valves. High cost performance, standard universal size, flexible MOQ. Very suitable for our local wholesale and retail business. 

From Tan Wei Ming · Malaysia · Feb.2025

    One-stop diversified pipe fitting supply. We can mix malleable iron, SS welded fittings, WCB valves, HDPE fittings in one container. Greatly reduce our logistics and communication costs. 

From Carlos Santos · Brazil · Apr.2026

    Cooperated for over 2 years on marine pipeline fittings. No quality problems at all. Timely after-sales technical support on welding and installation. Trustworthy and honest supplier. 

From Jack Wilson · Australia · Dec.2025

Company Profile

1. Company Overview

We are a professional pipe fitting export trading company with abundant years of foreign trade experience. 

We cooperate with large-scale original pipe fitting factory founded in 2000. It covers 53,000 square meters and area, with complete production lines & stable mass production capacity. 

Relying on mature supply chain system, we can provide stable high-quality pipe products for global customers.

2. Enterprise Qualification

Our company holds ISO9001:2015 Quality Management System Certification, and passed strict SGS third-party factory audit. 

Our platform rating reaches 5.0/5, repeat customer rate is 80%-100%. 

Average inquiry response time ≤ 2.08h, efficient & professional whole-process service. 

All products are insured by PICC to fully guarantee your order quality safety.

3. Stable Trade & Delivery Capacity

Our goods export to North & South America, Europe, Southeast Asia, Middle East, Africa and worldwide. 

Minimum order quantity: only 10 Pcs. 

Support FOB/CIF/DDP/EXW full trade terms & multiple safe payment methods. 

Fixed lead time: All orders finished within 15 working days, both peak & off season. 

Convenient shipment from Tianjin Port.

4. Customization Ability & After-sales Service Guarantee

We support full-range OEM & ODM customized services, including sample customization, design customization, full specification customization and flexible minor adjustment.
 
Our partner factory has strict QA&QC quality inspection team, standardized production inspection process, complete raw material traceability system, to ensure every batch of goods meets international export pipeline standard.
 
We provide one-stop whole-process after-sales service: pre-sales size matching consultation, production progress real-time tracking, after-sales welding technical guidance, installation problem solving and long-term follow-up service. Adhere to the business philosophy of survival by quality, development by integrity, to build long-term win-win stable cooperative relations with global customers.

5. Multiple Series Products

We supply a full range of diversified pipeline products, including malleable iron fittings, stainless steel threaded & welded fittings, grooved fittings, stainless steel valves, WCB valves, flanges, pipe nipples, HDPE fittings and high-pressure pipe fittings.