Tuzla, Istanbul

AISI 316/316L fittings

Solving the impossible: from fittings to SAE flanges, from hoses to valves

Since 2020, we have been manufacturing and supplying AISI 316/316L stainless steel fittings, hose assemblies, SAE flanges, valves and custom-made parts in Tuzla, Istanbul.

AISI 316 stainless steel elbows, SAE flanges and assorted hydraulic fittings on a workbench

Marine · Offshore · Shipyards

Fittings selected for saltwater, vibration and tight maintenance spaces

From deck hydraulics to the engine room, we prepare AISI 316L fitting, hose end, SAE flange and valve solutions for real-world conditions on ships and drilling sites.

Stainless steel hydraulic hoses and fittings on a drillship deck

CNC precision machining

If you have a technical drawing or a sample, you have your part

Where a standard product isn't the answer, we confirm the thread standard, sealing type and critical dimensions with you, then machine the part on CNC.

Stainless steel hydraulic fitting being machined on a CNC machine

Thread identification

The right match matters as much as the right part

We never mix up BSP, NPT, UNF/JIC and metric threads; we assess them together with line pressure, fluid and installation orientation.

Technical drawing, stainless steel fitting samples, a micrometer and a thread pitch gauge

Sector-specific stainless steel fittings

Stainless steel hydraulic fittings for your industry

Work with a supplier who knows your field. From ships to rolling mills, from mines to refineries, from food lines to defense projects, every sector has its own pressure, corrosion and maintenance challenges. Choose your sector to see the right products, services and technical notes for that field on a single page.

Typical lead time

Stock items
1-3 business days
Standard production
5-10 business days
Custom size
10-20 business days

Sectors

Choose your sector

Each sector page shows the stainless steel fittings selected for that field's conditions, along with services, application photos and frequently asked questions.

Marine & Shipping

AISI 316L fittings, hose assemblies, SAE flanges and valves built to withstand salt spray and vibration on deck cranes, windlasses, steering gear, passerelles and engine room lines.

36 products · 10 services

Shipyards & Ship Repair

Stainless steel pipe, flanges, fittings and hose assemblies, from newbuild piping circuits to drydock overhauls; fast spares from stock for ship crane service teams.

22 products · 9 services

Offshore & Drilling

AISI 316L hose ends, SAE flanges, adapters and valves for crane, pipe handling, deck machinery and power unit lines on drillships and platforms.

23 products · 10 services

Oil & Gas

316L twin-ferrule fittings, needle valves, check valves and tubing for wellhead control panels, chemical injection, refinery instrument and sampling lines, and pipeline stations.

20 products · 8 services

Defense Industry

SAE flanges, adapters, elbows and hose fittings CNC-machined after technical drawing approval for mobile hydraulic systems, maintenance benches and compact power units.

19 products · 7 services

Aviation

Compact AISI 316/316L fittings with clean threads and sealing surfaces for ground support equipment, hydraulic test benches and maintenance workshops.

14 products · 6 services

Chemical Processing

Stainless steel fittings, nipples, valves, flanges and hose fittings for chemical transfer and process lines, selected by weighing fluid compatibility, corrosion resistance, temperature and pressure together.

25 products · 9 services

Food & Beverage

AISI 316/316L fittings, nipples, valves, flanges and hose assemblies for food and beverage lines that call for cleanable surfaces, corrosion resistance and maintenance access.

18 products · 6 services

Rolling Mills & Heavy Industry

High-pressure hose ends, SAE flanges and adapters built for the high cycling, heat and vibration of presses, mill rolls and hydraulic power units; supplied from stock for emergency maintenance.

23 products · 8 services

Mining & Mineral Processing

AISI 316L hose ends, SAE flanges, adapters and valves selected for mine water, vibration and abrasion on underground and open-pit machinery, crushing and screening, flotation, leaching and drainage lines.

21 products · 8 services

Fire Suppression Systems

Neatly laid out, leak-tight stainless steel nipples, fittings, hose assemblies and flange connections that make servicing easier on fire pump sets, control skids and pressurized auxiliary lines.

15 products · 8 services

Paper & Board Mills

Elbows, tees, adapters, hose fittings and SAE flanges that cut maintenance time for continuously running hydraulic systems on corrugator, roll, cutting and actuator lines.

17 products · 6 services

Sector not listed?

If you need stainless steel hydraulic fittings for a different field, tell us about your application and we'll pin down the size, thread standard and material together.

How we work

A process that starts with your sector and ends with the right size

  1. Choose your sector

    Your sector page brings together products, services, application photos and frequently asked questions selected for that field's pressure, corrosion and maintenance conditions.

  2. Share your application

    A sample, a technical drawing or a photo taken in the field is enough. We'll pin down the thread standard, line pressure and fluid together.

  3. Production and shipping to confirmed dimensions

    Once the thread, cone and critical dimensions are confirmed, the part is picked from stock or produced on CNC; it then passes dimensional, thread and sealing inspection and is labeled and shipped.

Technicians assembling stainless steel hydraulic hose, fitting and flange connections

Services

More than selling parts

From piping to hose assembly, from CNC machining to technical consulting, we provide every service needed to get the connection right, all from a single source.

10 service areas, one point of contact

Product groups

At every point of the connection

From fittings to flanges, from hose ends to valves: AISI 316/316L product groups.

Production process

Controlled production from raw material to shipping

Fast supply for standard products, and production to technical drawing or sample for custom parts. Every step has a defined duration.

Production & quality
Machining an AISI 316L stainless steel hydraulic fitting on a CNC machine
  1. Raw material

    AISI 316/316L verification

    0.5-1 days

  2. Cutting

    Prepared to diameter and length

    0.5-1 days

  3. CNC Machining

    Thread, cone and surface

    2-5 days

  4. Cleaning

    Deburring and surface

    0.5-1 days

  5. Inspection

    Dimension / thread / sealing

    1-2 days

  6. Packaging

    Labeling and shipping

    0.5-1 days

The bars show the average duration of each step on a 0-5 day scale. Total lead time is planned based on stock availability, quantity, thread standard and custom sizes.

GÜNEYSS by the numbers

Year founded, Tuzla, Istanbul
2020
Production focused on AISI stainless steel
316/316L
Business days: stock items ready to ship
1-3
Sectors with field applications
8+

Knowledge Center

Technical notes and selection guides

From thread standards to flange types: short technical articles that help you choose the right fitting in the field.

FAQ

Frequently asked questions

The most common questions about materials, lead times and size confirmation. If your question isn't answered here, contact the person in charge directly.

What material do you manufacture with?

We use AISI 316 and 316L stainless steel in our products and machined parts: round bar, hex bar and tube stock. Because 316L is a low-carbon grade, it is the preferred choice for welded joints and salt-laden environments. At raw material receiving, surface, diameter and batch information is checked.

Which sectors do you serve?

Marine (boat builders, shipyards, ship crane and steering systems, passerelle manufacturers), offshore and drilling, oil and gas, the defense industry, aviation, chemical processing, food and beverage, rolling mills, mining and mineral processing, fire suppression systems, and paper and board mills. For these sectors, we supply stainless steel fittings, hose assemblies, SAE flanges, valves, and pipe and flange connections; for special needs such as control panels and actuation components, we assess manufacturability based on a technical drawing or sample.

What are your lead times?

Stock items are ready to ship within 1-3 business days on average. Standard production takes 5-10 business days on average, made-to-measure hose assemblies 5-15 business days on average, and custom-size and project manufacturing 10-20 business days on average after technical approval. The firm lead time is stated in writing in the quote, based on quantity, raw material diameter, thread standard and testing requirements.

Do you manufacture from samples or technical drawings?

Yes. Where a standard product isn't the answer, we produce custom adapters, nipples, flange blocks and transition pieces based on a sample, a technical drawing or dimensional data. The thread standard, sealing type and critical dimensions are confirmed in writing before production; for series quantities, series production begins after first article approval.

Do I need to send a technical drawing?

Not for standard products; the product type, thread standard, size and quantity are enough. For custom parts, a dimensioned technical drawing is the fastest route. If you don't have a drawing, we can start with a sample or clear photos of the part taken next to a caliper; any missing dimensions are clarified during the technical assessment.

I don't know the thread standard of my part. What should I do?

BSP, NPT, UNF/JIC and metric threads may look alike, but they differ in thread angle, pitch and sealing method; the outside diameter measured with a caliper alone is not enough. Photograph the threaded section of the part next to a caliper and send it to us, or send us the sample. We identify the standard with a thread pitch gauge and a sealing surface check, then recommend the right part.

Is there a minimum order quantity?

Order quantity is assessed according to the product and the type of manufacturing, and is finalized at the quote stage. In custom manufacturing, machine setup (fixturing, tooling, programming) accounts for a significant share of the total work, so quantity directly affects unit price and lead time. Simply state the quantity you need in your request; the option that suits you will be provided in writing in the quote.

How can I get a quote?

The fastest way is WhatsApp: just send a photo of the part along with the thread standard and size (if known), material, quantity and working pressure. You can also fill in the quote form on the site, call us or send an email. If any information is missing, our technical team will follow up to complete it.

How are products packaged and shipped?

Once production is complete, thread and port openings are sealed with protective caps, and products are packaged separately by size and order group. Before shipping, quantity, product type and a final visual check are verified. The shipping method and delivery address are agreed together at the order stage.

Where are you located?

We're in Tuzla, Istanbul. For sample drop-off or a face-to-face technical meeting, we recommend getting in touch by phone or WhatsApp in advance; product shipping is planned at the order stage.