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Brass PU Bulkhead
85+
Countries Served
4mm–16mm / 1/8″–1/2″
Tube OD Range
Vacuum to 15 Bar
Pressure Rating
Forged / Extruded Brass
Body Material
ISO 9001 / CE / RoHS
Quality Standards
01 — Overview

Buy best price high-quality, corrosion resistant Brass PU Bulkhead Assembly, Bulkhead Union, Brass Compression Fittings – Pneumatic Fittings, Brass tube fittings, brass push-to-lock fittings from Pioneer Industries recognized for manufacturing quality-tested products using latest manufacturing equipment at International Industry standards.

We at Pioneer Industries manufacture a wide variety of Brass PU Bulkhead which finds applications in numerous industries like Oil & Gas Industries, Chemical Industry, Nuclear Energy Sector, Petroleum Industries, Defence Industry, and Aerospace Industry. Available in numerous dimensions and grades. Pioneer Industries manufactures and exports high-quality industrial Brass PU Bulkhead.

Global Supply

Pioneer Industries manufacturing and exporting high-quality Brass PU Bulkhead worldwide.

We are India’s one of the leading Brass PU Bulkhead manufacturers and exporters to more than 85 countries exporting and manufacturing on a large scale. All size supply maintains a massive inventory of Brass PU Bulkhead, with all standard fractional (inch) and metric (mm) tube sizes available.

Brass PU Bulkhead is manufactured from high-grade brass raw materials sourced from trusted and reliable mills. Most Brass PU Bulkheads are available in bright nickel plating as well as natural brass finish. Various materials, thread specifications, and custom configurations are available. We’ve got the right product for your engineering needs.

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02 — Product Detail

Description of Brass PU Bulkhead

Brass PU Bulkhead (Brass Push-in Bulkhead Union) is a precision-engineered pneumatic fitting designed to route polyurethane (PU) and nylon pneumatic tubes securely through machine panels, chassis dividers, control cabinets, and partition bulkheads.

Constructed with a heavy-duty extruded or forged brass body, an external mounting thread, a brass locknut, and washer, the fitting locks rigidly onto the panel wall while providing instant, tool-free push-to-lock tube connections on both sides. Internal stainless steel gripping collets and elastomeric O-rings guarantee positive, airtight sealing under continuous vibration, dynamic line movement, and cyclic pressure spikes.

Features Brass PU Bulkhead:

  • Extreme conditions durability: Precision designed to withstand high pressure, mechanical shock, vibration, vacuum, and temperature fluctuations.
  • Instant tool-free assembly: Push-to-lock connection allows immediate tube insertion and rapid one-touch disconnection without specialized tools.
  • Robust panel mounting: Precision-cut external bulkhead threads and heavy-duty brass locknut clamp firmly on panels up to 16 mm thickness.
  • Stainless steel gripping collet: Spring-tempered AISI 301/304 gripping teeth hold calibrated PU and nylon tubing securely without pull-out.
  • Leak-tight elastomeric sealing: Internal NBR / FKM O-rings deliver 100% airtight sealing under full working pressure and vacuum.
  • Bright nickel-plated finish: Highly resistant to atmospheric corrosion, oil exposure, moisture, and harsh industrial environments.
  • Superior 4:1 safety factor: Engineered with a 4:1 design factor ensuring tubing burst protection before joint failure.
+ + + +
Specification

Sizes: Metric 4 mm to 16 mm Tube OD (Fractional 1/8″ to 1/2″ Tube OD). Bulkhead Mounting Threads: Metric M12×1.0 through M27×1.5 and UNEF/UNF threads. Material of Construction: High Tensile Brass (IS 319 / CW614N / CZ121 / ASTM B16 C36000) with Bright Nickel Plating or Natural Brass. Internal Seals: NBR (standard -20°C to +80°C), Viton/FKM optional (-20°C to +150°C). Working Pressure: Vacuum to 15 Bar (220 PSI). Working Media: Compressed Air, Neutral Gases, Vacuum.

Technical Specifications & Dimensions

Brass PU Bulkhead Dimensional Tables

Explore full engineering dimensional configurations for Metric (mm) and Imperial / Fractional (Inch) Brass PU Bulkheads. Sourced and manufactured according to international pneumatic standards.

Metric Brass PU Bulkhead Dimensions (Tube O.D. 4 mm to 16 mm)
Standard Metric Range
Part Number Tube OD (mm) Bulkhead Thread (Metric) Mounting Hole Ø (mm) Max Panel Thickness (mm) Hex Nut A/F (mm) Working Pressure (Bar)
PI-PUBH-04M 4 mm M12 × 1.0 12.5 mm 8.0 mm 14 mm 15 Bar (220 PSI)
PI-PUBH-06M 6 mm M14 × 1.0 14.5 mm 9.5 mm 17 mm 15 Bar (220 PSI)
PI-PUBH-08M 8 mm M16 × 1.0 16.5 mm 11.0 mm 19 mm 15 Bar (220 PSI)
PI-PUBH-10M 10 mm M20 × 1.0 20.5 mm 12.5 mm 24 mm 12 Bar (175 PSI)
PI-PUBH-12M 12 mm M22 × 1.0 22.5 mm 14.0 mm 27 mm 12 Bar (175 PSI)
PI-PUBH-14M 14 mm M24 × 1.0 24.5 mm 15.0 mm 30 mm 10 Bar (145 PSI)
PI-PUBH-16M 16 mm M27 × 1.5 27.5 mm 16.0 mm 32 mm 10 Bar (145 PSI)
All dimensions in millimeters (mm). Bulkhead mounting threads conform to standard ISO metric fine pitch. Custom lengths available upon request.
Fractional / Imperial Brass PU Bulkhead Dimensions (Tube O.D. 1/8″ to 1/2″)
Fractional Inch Series
Part Number Tube OD (Inch) Bulkhead Thread (UNEF / Metric) Mounting Hole Ø (Inch) Max Panel Thickness (Inch) Hex Nut A/F (Inch) Working Pressure (PSI)
PI-PUBH-02I 1/8″ (0.125″) 7/16-28 UNEF 0.450″ (11.5 mm) 0.315″ (8.0 mm) 9/16″ 220 PSI
PI-PUBH-2.5I 5/32″ (4 mm) M12 × 1.0 0.492″ (12.5 mm) 0.350″ (8.9 mm) 9/16″ 220 PSI
PI-PUBH-04I 1/4″ (0.250″) 9/16-24 UNEF / M14 0.575″ (14.6 mm) 0.375″ (9.5 mm) 11/16″ 220 PSI
PI-PUBH-05I 5/16″ (8 mm) M16 × 1.0 0.650″ (16.5 mm) 0.435″ (11.0 mm) 3/4″ 220 PSI
PI-PUBH-06I 3/8″ (0.375″) 3/4-20 UNEF / M20 0.805″ (20.5 mm) 0.500″ (12.7 mm) 15/16″ 180 PSI
PI-PUBH-08I 1/2″ (0.500″) 7/8-20 UNEF / M22 0.890″ (22.6 mm) 0.550″ (14.0 mm) 1-1/16″ 150 PSI
Tube O.D. shown in fractional inches; dimensions in inches (mm). Compatible with UNEF/UNF bulkhead locknuts.
Material Grades, Mechanical Properties & Applicable Standards
Certified Material Specifications
Component Material Specification Standard Specification Mechanical Properties Temperature Limits Key Features
Fitting Body & Nut Free Cutting Brass (CW614N / CZ121) IS 319 Gr. 1 / ASTM B16 C36000 Tensile ≥ 440 MPa, 120–160 HB -20°C to +80°C (up to 150°C) High tensile strength, bright nickel-plated corrosion protection
Gripping Collet Stainless Steel AISI 301 / 304 ASTM A666 / DIN 1.4310 Spring Tempered ≥ 42 HRC -40°C to +200°C Precision biting teeth ensure permanent tube lock without scoring
Primary O-Ring Seal Nitrile Rubber (NBR 70) ASTM D2000 / ISO 1629 Hardness 70 ± 5 Shore A -20°C to +80°C Standard pneumatic airtight sealing for air, inert gas, vacuum
High-Temp Seal (Optional) Fluoroelastomer (Viton / FKM) ASTM D1418 / ISO 1629 Hardness 75 ± 5 Shore A -20°C to +150°C Resistant to synthetic oils, high temperatures, chemical vapors
Release Sleeve Collar Polyoxymethylene (POM) / Brass ISO 9988 / ASTM D4181 Tensile ≥ 65 MPa -20°C to +100°C Smooth one-touch manual release without jamming or collet binding
Lock Washer Phosphor Bronze / Spring Steel DIN 127 / ASTM B103 Spring Tempered -40°C to +150°C Prevents bulkhead nut loosening under severe machine vibration
100% material traceability with EN 10204 Type 3.1 inspection certification provided upon order dispatch.
03 — Applications

Applications/Uses of Brass PU Bulkhead

Brass PU Bulkhead finds critical deployment across a wide variety of industrial pneumatic and fluidic systems:

01

Pneumatic Control Panels –

Routes main supply air and actuator feedback lines cleanly through electrical and pneumatic enclosure doors and side walls while preserving enclosure IP ratings.

02

Robotics & Industrial Automation –

Connects moving robotic arm air feeds to stationary base junction boxes across bulkhead partitions, resisting dynamic flexure and repetitive cyclic motion.

03

Machine Tools & CNC Centers –

Feeds pneumatic clamping lines, tool changers, and air blast nozzles straight through sheet metal chip guards and splash enclosures without line abrasion.

04

Packaging & Bottling Machinery –

Widely deployed across high-speed cartoning, bottle blow-molding, and filling machinery partitions requiring quick pneumatic tube maintenance and washdown durability.

05

Automotive & Commercial Vehicles –

Routes air brake auxiliary lines, pneumatic suspension tubing, and automated tire inflation air lines across chassis bulkheads and cab partition walls.

06

Chemical Refining –

In chemical refineries, Brass Tube Fittings are made using corrosion resistant high performance materials, such as Brass, tool alloys, and exotic metals and find use in machineries such as heat exchangers, chemical tanks, and processing systems.

07

Oil and gas –

These Brass Tube Fittings find application in processing equipment such as tanks, drilling rigs, and pumps, and used in the oil and gas industries giving stable performance in high stress and corrosive conditions.

08

Marine –

Fittings installed in the marine industry necessitate excellent corrosion resistance to withstand the extended periods of exposure to saltwater that marine ramps, marine decks, bulkheads, and tanks experience.

04 — Industries

Industries We Serve

Pioneer Industries’ Brass PU Bulkheads are deployed across worldwide demanding industries including:

+ Pharmaceutical Equipment
+ Chemical Processing
+ Sea Water Desalination
+ Heat Exchangers
+ Surface Condensers
+ Pulp and Paper Mills
+ Thermal & Nuclear Power
+ Natural Gas Processing
+ Aerospace Industry
+ Nuclear Energy Systems
+ Off-Shore Exploration
+ Oil & Gas Refineries
+ Petrochemical Complexes
+ Industrial Automation
+ Automobile Manufacturing
05 — Range

Types of Brass PU Fittings offered by Pioneer Industries

06 — FAQs

Frequently Asked Questions about Brass PU Bulkhead

Comprehensive technical guidance and engineering answers regarding Brass PU Bulkheads, push-in collet mechanics, panel mounting, and pneumatic specifications from Pioneer Industries.

A Brass PU Bulkhead fitting (also known as a Brass Push-in Bulkhead Union or Pneumatic Panel Mount Connector) is a dual-ended fluid connector engineered to pass pneumatic tubing securely through machine enclosures, electrical control cabinets, partition bulkheads, or vehicle chassis panels. It features an externally threaded central brass body with a heavy-duty brass locknut and washer to clamp firmly across panel walls. Both tube ports integrate a tool-free push-to-lock connection: calibrated polyurethane (PU) or nylon tubing is simply pushed straight into the port, where an internal stainless steel (AISI 301/304) gripping collet instantly bites into the tube's outer diameter to prevent pull-out under pressure, while a precision elastomeric O-ring (NBR or FKM) compresses around the tube perimeter to establish an instantaneous, bubble-tight seal. Pushing the external release collar mechanically spreads the collet teeth, permitting rapid, non-destructive tube removal.
While plastic push-in fittings are economical for light-duty benchtop pneumatic circuits, Pioneer Brass PU Bulkheads offer substantial mechanical and environmental advantages in demanding industrial environments: (1) Superior Mechanical Ruggedness: Precision CNC-machined brass (CW614N / IS 319 / C36000) withstands intense panel vibration, mechanical impacts, and external physical strain without cracking; (2) High Thread Stripping Resistance: Metal bulkhead threads allow firm locknut tightening (up to 30+ Nm) against thick steel panels without thread deformation or stripping; (3) Thermal & Environmental Stability: Brass maintains full structural integrity from -20°C to +80°C (and up to +150°C with Viton seals), completely immune to plastic embrittlement, UV radiation, and welding spatter; (4) Chemical & Oil Resistance: Brass withstands exposure to cutting oils, lubricants, diesel mist, and mild solvents that degrade polybutylene terephthalate (PBT) and polyamide plastics.
Pioneer manufactures Brass PU Bulkheads to accommodate a comprehensive range of industrial panel dimensions. Metric sizes feature fine-pitch metric threads: 4 mm tube OD uses M12×1.0 (requires 12.5 mm cutout, max panel thickness 8.0 mm); 6 mm OD uses M14×1.0 (14.5 mm cutout, max panel 9.5 mm); 8 mm OD uses M16×1.0 (16.5 mm cutout, max panel 11.0 mm); 10 mm OD uses M20×1.0 (20.5 mm cutout, max panel 12.5 mm); 12 mm OD uses M22×1.0 (22.5 mm cutout, max panel 14.0 mm); and 16 mm OD uses M27×1.5 (27.5 mm cutout, max panel 16.0 mm). Fractional inch configurations (1/8″, 1/4″, 3/8″, 1/2″) are also supplied with standard UNEF/UNF bulkhead threads. Extended-body bulkhead versions for panels up to 25 mm thick are available upon custom request.
Pioneer Brass PU Bulkheads are engineered to interface flawlessly with all standard industrial polymer tubing conforming to ISO 14743 and DIN 73378 dimensional tolerances. Compatible tubing materials include: (1) Polyurethane (PU / TPU / Ether-based or Ester-based, Shore 95A / 98A) for high flexibility, kink resistance, and tight bend radii in robotic and automation tooling; (2) Polyamide / Nylon (PA6, PA11, PA12) for higher pressure pneumatic lines, chemical transmission, and vehicle air brake skids; (3) Polyethylene (PE / LDPE / HDPE) for low-pressure food packaging, beverage dispense, and laboratory fluidics; (4) Fluoropolymer (PTFE, FEP, PFA) for high-temperature and aggressive chemical environments. Tube outer diameters must adhere to tight tolerances (typically ±0.05 mm to ±0.10 mm) to guarantee leak-tight O-ring sealing and robust collet engagement.
Pioneer Brass PU Bulkhead connectors are rated for operating pressures from vacuum (-0.99 bar / -100 kPa / 29.5 inHg) up to 15 bar (220 PSI / 1.5 MPa) across 4 mm to 8 mm line sizes, and up to 10–12 bar (145–175 PSI) for 10 mm to 16 mm sizes, depending on the pressure rating of the mating polymer tubing. All brass bulkhead bodies are hydrostatic proof-tested to 25 bar (360 PSI) and designed with a minimum 4:1 safety factor against burst pressure, ensuring the pneumatic tubing will expand and burst long before mechanical failure or joint separation occurs at the bulkhead union.
Pioneer equips Brass PU Bulkheads with application-tailored elastomer seals: (1) Nitrile Rubber (NBR 70 Shore A, standard) provides outstanding wear resistance and airtight sealing for dry or lubricated compressed air, inert nitrogen, and neutral gases from -20°C to +80°C; (2) Fluoroelastomer (Viton / FKM 75 Shore A, optional) extends thermal capabilities to +150°C continuous service while resisting synthetic compressor lubricants, hydraulic oils, hydrocarbons, and ozone degradation; (3) EPDM (Ethylene Propylene Diene Monomer, optional) is specified for low-pressure steam, hot water washdown, glycol coolants, and phosphate ester fluids from -40°C to +130°C.
The heart of Pioneer's push-in mechanism is an annular multi-tooth collet stamped from spring-tempered AISI 301/304 stainless steel. The collet teeth are oriented at an engineered acute angle inclined inward in the direction of tube insertion. When tubing is introduced, the teeth flex smoothly outward, imposing minimal insertion friction. Under internal air pressure, thermal expansion, or mechanical line tension pulling the tube outward, the teeth bite wedge-tight into the outer surface layer of the tubing, converting outward tensile load into radial clamping force. This self-locking geometry reliably resists dynamic vibration, line whip, and cyclic pressure pulsations without cutting through the tube wall or causing premature wall necking.
Pioneer supplies Brass PU Bulkhead fittings with multiple specialized surface treatments: (1) Electrolytic Bright Nickel Plating (Standard): A uniform 5–8 micron nickel electroplate delivers high cosmetic brilliance, prevents copper oxidation and green verdigris tarnish, and provides superior resistance to industrial atmospheric corrosion, humidity, and mild caustic washdowns; (2) Electroless Nickel Plating (High-Corrosion): Delivers a completely uniform, zero-porosity phosphorus-nickel coating inside deep internal bores and threads for harsh chemical, marine salt-fog, and offshore exposure; (3) Natural / Pickled Brass: Unplated, chemically descaled brass preferred in specific explosive ordnance, sparking-sensitive atmospheres, or electrical earthing configurations.
To achieve a lifetime zero-leakage bulkhead assembly: (1) Drill or punch a clean, burr-free panel hole matching the bulkhead thread clearance diameter; (2) Remove the outer brass locknut and washer, feed the bulkhead body through the panel, rethread the washer and locknut, and torque the nut firmly against the panel using a standard open-end wrench; (3) Cut the pneumatic tubing exactly at 90° using a dedicated sharp plastic tube cutter (never use diagonal wire cutters or utility knives that squash the tube oval); (4) Ensure the tube OD is free of deep longitudinal scratches, burrs, or debris; (5) Push the tube firmly straight into the fitting until it bottoms out against the internal shoulder (typically 14–18 mm insertion depth); (6) Tug lightly on the tube to confirm positive collet lock. To disconnect: exhaust all air pressure, press the release collar squarely inward toward the fitting body, and withdraw the tube cleanly without tools.
Every production batch of Pioneer Brass PU Bulkheads undergoes comprehensive quality validation adhering to ISO 9001:2015 standards at our Mumbai manufacturing facility. Testing protocols include: (1) 100% pneumatic bubble-immersion leak testing at 10 bar compressed air to verify zero seal leakage; (2) Optical profile projector inspection of critical bulkhead thread profiles, collet tooth angles, and O-ring seating grooves; (3) Tube tensile pull-off testing ensuring retention force exceeds ISO 14743 requirements; (4) Positive Material Identification (PMI) by optical emission spectrometry verifying brass alloy composition. Products are delivered with authentic EN 10204 Type 3.1 Inspection Certificates specifying chemical analysis and mechanical properties.
07 — Enquiry

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