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Pneumatic fittings / metal retention

Metal, Stainless, and Nut-Lock Pneumatic Fittings

Review function, size, pressure, mounting, and inquiry data for Metal, Stainless, and Nut-Lock Pneumatic Fittings.

View product specificationsCompare metal fitting data
Metal body routesStainless optionsNut-lock retentionHarsh-area review

Category buying guide

Choose metal fittings when environment and retention matter.

Stainless, metal quick-connect, and supplemental nut-lock fitting series should be reviewed separately from ordinary plastic push-in fittings so material, vibration, corrosion, and retention requirements are easier to quote.

Pneumatic fitting categories
01Push-In Fittings02Flow-Control Fittings03Hose Barb Fittings04Pneumatic Mufflers05Metal and Stainless Fittings
Metal, Stainless, and Nut-Lock Pneumatic Fittings • Product specifications

Metal, Stainless, and Nut-Lock Pneumatic Fittings: key specs for fast selection

Each product series includes images, order cues, key specifications, and comparison tables for faster RFQ selection.

Visual catalog

Identify models by body style.

Filter the catalog by body style, then use the model badge on each photo for RFQ matching.

Product imageKNPC

KNPC - Male Straight

Tube
4-16 mm
thread
M5-R1/2
Type
Male thread
View Data
Product imageKNPCF

KNPCF - Female Straight

Tube
4-12 mm
thread
G1/8-G1/2
Type
Female thread
View Data
Product imageKNPL

KNPL - Male Elbow

Tube
4-16 mm
Angle
90 deg Elbow
thread
M5-R1/2
View Data
Product imageKNPV

KNPV - Universal Elbow

Tube
4-12 mm
Feature
360 deg Swivel
thread
M5-R1/2
View Data
Product imageKNPV1

KNPV1 - Union Elbow

Tube
4-16 mm
Angle
90 deg
Type
Tube-Tube
View Data
Product imageKNPB

KNPB - Male Branch Tee

Tube
4-12 mm
Shape
Tee (Branch)
thread
R1/8-R1/2
View Data
Product imageKNPD

KNPD - Male Run Tee

Tube
4-12 mm
Shape
Tee (Run)
thread
R1/8-R1/2
View Data
Product imageKNPE

KNPE - Union Tee

Tube
4-16 mm
Ports
3-Way
Type
Equal Union
View Data
Product imageKNPZA

KNPZA - Union Cross

Tube
4-12 mm
Ports
4-Way
Type
Cross Union
View Data
Product imageKNPU

KNPU - Union Straight

Tube
4-16 mm
Type
Equal Union
Material
Brass
View Data
Product imageKNPM

KNPM - Bulkhead Union

Tube
4-12 mm
Feature
Panel Mount
Type
Straight
View Data
Product imageKNPG

KNPG - Union Reducer

Tube
Reducing
Type
Straight
Material
Brass
View Data
Product imageKNSL

KNSL - Speed Controller

Tube
4-12 mm
thread
M5-R1/2
Func
Flow Control
View Data
Selection snapshot

Rapid fitting model parameter table

14 rows
SeriesBody styleTube O.D.thread / PortconfigurationMaterialWorking pressureWorking temp.Applicable tube
KNPCMale straight connector4, 6, 8, 10, 12, 14, 16 mmM5, R1/8, R1/4, R3/8, R1/2Straight connection from port to tubeNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPCFFemale straight connector4, 6, 8, 10, 12 mmG1/8, G1/4, G3/8, G1/2Straight connection to male threadNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPLMale elbow connector4, 6, 8, 10, 12, 14, 16 mmM5, R1/8, R1/4, R3/8, R1/290 deg fixed elbow connectionNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPVUniversal elbow connector4, 6, 8, 10, 12 mmM5, R1/8, R1/4, R3/8, R1/2360 deg swivel banjo typeNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPV1Union elbow connector4, 6, 8, 10, 12, 14, 16 mmTube - tube90 deg equal elbow unionNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPBMale branch tee4, 6, 8, 10, 12 mmR1/8, R1/4, R3/8, R1/2T-shape: thread in middleNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPDMale run tee4, 6, 8, 10, 12 mmR1/8, R1/4, R3/8, R1/2T-shape: thread on sideNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPEUnion tee4, 6, 8, 10, 12, 14, 16 mmTube - tube - tubeEqual T-junctionNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPZAUnion cross4, 6, 8, 10, 12 mm4-way tube portsEqual cross junctionNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPUUnion straight connector4, 6, 8, 10, 12, 14, 16 mmTube - tubeEqual straight unionNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPMBulkhead union connector4, 6, 8, 10, 12 mmTube - tube (panel mount)Straight union with panel nutNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNPGUnion reducer connector6-4, 8-6, 10-8, 12-10 mmTube - tube (unequal)Straight reducerNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
KNSLSpeed controller4, 6, 8, 10, 12 mmM5, R1/8, R1/4, R3/8, R1/2Flow control with locking nutNickel-plated Brass body + nut0 to 1.0 MPa; Max. 1.5 MPa-20 to 80 degC, No freezingPU / nylon, soft or hard
Additional table

Rapid nut-locking shared specifications

9 rows
ParameterSpecification
Tube size range4x6, 6x8, 8x10, 10x12 mm; 14 and 16 mm OD on selected straight, elbow, tee, and union models
thread sizesM5, R1/8, R1/4, R3/8, R1/2 for male-thread models; G1/8 to G1/2 for female-thread models
Applicable tubePU and nylon tubing, soft or hard
Working pressure0 to 1.0 MPa; Max. 1.5 MPa
Vacuum pressureDown to -100 kPa
Working temperature-20 to 80 degC, No freezing
FluidAir and inert gas
MaterialNickel-plated Brass body and nut
Additional table

Rapid fitting category guide

5 rows
CategoryModelsTypical selection detail
StraightKNPC, KNPCF, KNPU, KNPM, KNPGConfirm tube size, thread or panel mounting, and whether the connection is equal or reducing
ElbowKNPL, KNPV, KNPV1Confirm fixed elbow, swivel banjo, or tube-to-tube elbow plus installed clearance
Tee/Y/CrossKNPB, KNPD, KNPE, KNPZAConfirm branch direction, number of ports, tube sizes, and thread position
ValveKNSLConfirm tube size, thread, meter-in or meter-out use, and adjustment access

Choose by connection job

Start with how the air line connects.

Pick the closest fitting use case, then confirm tube OD, thread, body shape, material, pressure, and installation clearance before RFQ.

Scenario 01

Hold tubing more securely on moving machinery.

Review function, size, pressure, mounting, and inquiry data for Metal, Stainless, and Nut-Lock Pneumatic Fittings.

Recommended option

Rapid nut-lock or metal-retention route with tube size confirmation.

  • Tube size
  • Vibration
  • Pull direction
  • Material

Common fitting uses

Where pneumatic fittings solve connection details.

Bepto Pneumatic KNPC rapid nut-locking pneumatic fitting product photo
Fitting use 01

Vibration-prone equipment

Use metal-body or nut-lock fittings where tubing may be pulled, moved, or vibrated near conveyors, indexers, and fixture slides.

  • Review tube retention
  • Confirm pressure
  • Check body clearance
Stainless pneumatic fitting for washdown or corrosion zones
Fitting use 02

Washdown and corrosion zones

Use stainless fittings where water, cleaning chemicals, corrosion exposure, temperature, or media compatibility affects the connection.

  • Confirm material
  • Share environment
  • Check thread seal
Nut-lock pneumatic fitting for tube retention
Fitting use 03

Moving fixtures and tube-retention points

Use retained-tube fittings where machine motion or cable-track movement makes ordinary push-in retention less suitable.

  • Measure thread
  • Confirm tube material
  • Check pull direction

Connection flow tools

Calculate tube ID, air velocity, and pressure drop before selecting fittings.

Use these tools when fitting selection depends on tube outside diameter, thread, line velocity, pressure loss, or flow-unit communication.

Open Valves & flow tools
01Valves & flow

Tube ID Calculator

Estimate tube inner diameter for the connection and flow requirement.

Free-air flowFlow unitWorking pressureOpen calculator02Valves & flow

Air Velocity Calculator

Check whether tube size keeps air velocity in a practical range.

Free-air flowFlow unitInternal diameterOpen calculator03Valves & flow

Pressure Drop Calculator

Compare expected pressure loss through tubing and connection runs.

FlowPipe lengthEquivalent fitting lengthOpen calculator04Unit conversion

Flow Converter

Convert flow units before sending fitting or tubing RFQ details.

Flow valueSource flow unitOpen calculator

Request category support

Send the details that make this Metal, Stainless, and Nut-Lock Pneumatic Fittings inquiry review-ready.

Bepto Pneumatic is the pneumatic product line of Bepto Industrial. Send model numbers, photos, drawings, or rough requirements and the team will route the request for sales or technical review.

  • Tube or hose size
  • Thread standard
  • Material requirement
  • Vibration, corrosion, or media condition
Push-In FittingsFlow-Control FittingsHose Barb FittingsPneumatic MufflersAll Pneumatic Fittings

Metal, Stainless, and Nut-Lock Pneumatic Fittings RFQ details

Fields marked with * help prepare the request.

Category FAQ

Common questions before sending an inquiry.

01Metal, Stainless, and Nut-Lock Pneumatic FittingsWhat information helps Bepto Pneumatic quote metal, stainless, and nut-lock pneumatic fittings?

Tube outside diameter or hose size, thread standard, body shape, pressure range, material preference, installed environment, and quantity are the most useful starting details.

02Metal, Stainless, and Nut-Lock Pneumatic FittingsCan Bepto Pneumatic match an existing fitting from photos?

Yes. Send photos from the tube side, thread side, and installed position, plus a tube or thread measurement if available.

03Metal, Stainless, and Nut-Lock Pneumatic FittingsWhy are fitting products grouped separately?

Each fitting function has different selection details. Grouping push-in, flow-control, metal, hose barb, and muffler products separately makes tube size, thread, pressure, material, and RFQ details easier to compare.