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H1109X3X4-SS

H1109X3X4-SS
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H1109X3X4-SS

FOH H1109X3X4-SS — 316 Stainless Steel Reducing Stem Union Push-to-Connect Fitting, 1/4 stem to 3/16 Tube

The FOH H1109X3X4-SS is a 316 stainless steel reducing stem union push-to-connect fitting with FKM seals. It connects a smaller push-to-connect tube to a differently sized plug-in stem, providing a compact transition into a compatible push-in fitting or port. The listed connection is 1/4 stem to 3/16 Tube.

The FOH range provides an additional sourcing option alongside the standard S-series stainless fittings. Compare tube outside diameter, thread form, sealing details and published ratings before substituting one series for another.

316 Stainless SteelBody Material
FKMSeal Material
Reducing Stem UnionFitting Style
1/4 stem to 3/16 TubeConnection

Technical Specifications

SpecificationDetails
Product TypeReducing Stem Union push-to-connect fitting
Part NumberH1109X3X4-SS
Connection1/4 stem to 3/16 Tube
Body Material316 stainless steel
Seal MaterialFKM fluoroelastomer
ServiceIndustrial compressed air and vacuum applications
EnvironmentCorrosive, washdown and food-production machinery areas where stainless components are specified
HTS Code7307.29.0090

Why 316 Stainless Steel and FKM Matter

Grade 316 stainless steel contains molybdenum, which improves resistance to certain types of localized corrosion compared with grade 304. That is useful on food, beverage and pharmaceutical machinery where exposed pneumatic components may encounter moisture and repeated cleaning. It is not corrosion-proof: chloride-rich cleaners, crevices and high temperatures still require assessment. FKM fluoroelastomer seals are used at the tube connection. FKM can be suitable for many industrial services, but it is not universally compatible with hot sodium-hydroxide washdown, steam or every cleaning chemical. Check the actual fluid, concentration, temperature, exposure time and seal grade before specifying the fitting.

316 SSCorrosion-Resistant Metal Body
FKMSeal Compatibility Must Be Checked
Push-InRapid Tube Installation
WashdownFor Selected Washdown Environments

Key Features

  • Reducing Stem Union configuration: Connects a smaller push-to-connect tube to a differently sized plug-in stem, providing a compact transition into a compatible push-in fitting or port.
  • Specified connection: 1/4 stem to 3/16 Tube. Match the tubing outside diameter and the applicable thread or stem style.
  • Grade 316 stainless steel body for improved resistance to many wet, cleaned or corrosive machinery environments.
  • FKM sealing elements at the tube interface; chemical, pressure and temperature compatibility must be confirmed.
  • Push-to-connect assembly reduces the need for separate tube nuts or compression ferrules.

Typical Applications

  • Compressed-air distribution on food and beverage packaging or filling equipment
  • Pneumatic actuators, valves and control circuits near frequently cleaned production equipment
  • External air or vacuum tubing on pharmaceutical manufacturing machinery, subject to equipment specifications
  • Transitions between a plug-in stem and a different tubing size

How the Reducing Stem Union Works

This reducing stem union is used when a tube must terminate in a plug-in stem of a different nominal size. Match the stem diameter and the tubing outside diameter separately; a stem connection is not a threaded port. The FOH H1109X3X4-SS is specified with 1/4 stem to 3/16 Tube.

Selection Guidance for Washdown and Pharmaceutical Equipment

These fittings are described for pneumatic or vacuum circuits on processing machinery, not as certified sanitary product-contact fittings. A direct food- or pharmaceutical-contact application requires separate confirmation of hygienic design, material compliance and the relevant approvals. For chemical washdown, assess the 316 metal body and FKM seal individually; in particular, do not assume hot caustic cleaners or chlorinated disinfectants are compatible.

Installation check: Cut approved tubing squarely, insert fully to the stop and check tube retention before pressurizing. Match all connection sizes and thread forms, and verify operating pressure, vacuum rating, temperature and cleaning chemistry against the product data.

Frequently Asked Questions

What does the FOH H1109X3X4-SS reducing stem union do?

It connects a smaller push-to-connect tube to a differently sized plug-in stem, providing a compact transition into a compatible push-in fitting or port. The specified connection is 1/4 stem to 3/16 Tube. This reducing stem union is used when a tube must terminate in a plug-in stem of a different nominal size. Match the stem diameter and the tubing outside diameter separately; a stem connection is not a threaded port.

Why use grade 316 stainless steel for this pneumatic fitting?

Grade 316 contains molybdenum, which improves resistance to some forms of localized corrosion compared with 304. It is often chosen on exposed food, beverage and pharmaceutical machinery where moisture and frequent cleaning are concerns. It is not immune to chloride pitting or crevice corrosion.

Can the FKM seals handle caustic washdown chemicals?

Not automatically. FKM resists many oils and industrial media, but strong or hot alkaline cleaners, steam and some sanitizers can damage certain grades of FKM. Verify the complete cleaning process, including chemical concentration, temperature and exposure time, for both the seal and the stainless body.

Is this fitting approved for direct food or pharmaceutical product contact?

No direct-contact or hygienic certification is established by this product listing. The fitting may be selected for pneumatic or vacuum circuits on processing machinery, but food-contact or sterile-process service needs separate confirmation of material compliance, surface finish, cleanability and manufacturer approvals.

How do I choose the correct tube and thread connection?

This model lists 1/4 stem to 3/16 Tube. Verify the tube outside diameter and any stem or threaded port dimensions. NPT, BSPP, BSPT, M5 and 10-32 UNF are not automatically interchangeable. FOH is a secondary sourcing range alongside the standard S-series; compare the published specifications before substituting.

Link to Pneuforce Data Sheets (this file will open in a new browser tab)
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Suitable for Compressed Air, Vacuum & NON Potable Water Applications