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Tube-to-Tube Fittings
DK-LOK Compression Tube Straight Fitting, 3/4" Tube OD x 3/4" Tube OD, SS316, DU-12-S
DK-LOK

DK-LOK Compression Tube Straight Fitting, 3/4" Tube OD x 3/4" Tube OD, SS316, DU-12-S

Mfr. part no.
DU-12-S
SKU
DK-VA86861212

Specifications

Connection Size (End 1) 3/4" Tube OD
Connection Size (End 2) 3/4" Tube OD
Body Material 316 stainless steel
Ferrule Design Double ferrule (front & back ferrules)

Key Features

  • Double-ferrule design (front & back ferrules) for secure tube grip and leak-tight sealing
  • SS316 stainless steel body, nut and ferrules for corrosion resistance
  • Straight-body configuration for clean, compact routing

Description

DK-LOK DU Series straight tube union fitting with two 3/4" compression tube ends for inline tube-to-tube joining. Manufactured from SS316 stainless steel with a proven double ferrule design (front and back ferrules) to provide a strong grip, vibration resistance, and leak‑tight sealing in instrumentation and process tubing systems. Suitable for high-pressure service when installed per Dk-lok tube fitting make-up instructions.

Applications

  • Instrumentation and control lines
  • Hydraulic and pneumatic tubing systems
  • Process and utility piping interface (tube to NPT where applicable)
  • General industrial fluid & gas service

Documents

  • DK Lok Compression Tube Fittings — Catalog

    PDF, 6.2 MB

Cross-reference

The closest equivalents from other brands, with the differences stated so you can check before you order.

Swagelok SS-1210-6

3/4" SS316 Double-Ferrule Compression Tube Union Straight

Swagelok SS-1210-6 is a straight tube union fitting with two 3/4" OD compression ends using Swagelok's industry-standard two-ferrule (front and back) bite-type design. Manufactured from 316 stainless steel, it provides leak-tight, vibration-resistant connections in instrumentation and process tubing systems. Rated for high-pressure service and widely accepted as the benchmark double-ferrule tube fitting in the GCC oil & gas sector.

Specifications of the Swagelok part

Tube OD
3/4 inch
Connection Type
Double-ferrule compression (both ends)
Material
SS316
Fitting Type
Straight union
Pressure Rating
Up to 3600 psig (depending on tubing wall)
End Configuration
Tube x Tube

Hy-Lok CUA-12-S316

3/4" SS316 Double-Ferrule Compression Tube Union Straight

Hy-Lok U series straight tube union with two 3/4" OD double-ferrule compression ends in 316 stainless steel. Hy-Lok's two-ferrule design is dimensionally and functionally equivalent to DK-LOK, Swagelok, and Parker A-LOK, and is widely accepted in GCC instrumentation and process piping applications. Suitable for high-pressure, high-vibration service.

Specifications of the Hy-Lok part

Tube OD
3/4 inch
Connection Type
Double-ferrule compression (both ends)
Material
SS316
Fitting Type
Straight union
Series
U Series
End Configuration
Tube x Tube

Superlok SU-12-S316

3/4" SS316 Superlok Double-Ferrule Compression Tube Union Straight

Superlok SU series straight tube union with two 3/4" OD double-ferrule compression ends in 316 stainless steel. Manufactured by BMT (Korea), Superlok fittings follow the same two-ferrule design philosophy as DK-LOK and are dimensionally compatible. Accepted on GCC instrumentation projects as a like-for-like alternative to DK-LOK, Swagelok, and Hy-Lok.

Specifications of the Superlok part

Tube OD
3/4 inch
Connection Type
Double-ferrule compression (both ends)
Material
SS316
Fitting Type
Straight union
Series
SU Series
End Configuration
Tube x Tube

Fitok SS-U-FL12

3/4" SS316 Fitok Double-Ferrule Compression Tube Union Straight

Fitok U series straight tube union with two 3/4" OD double-ferrule compression ends in 316 stainless steel. Fitok is an internationally recognised instrumentation fitting manufacturer whose two-ferrule design is dimensionally compatible with Swagelok and DK-LOK. Increasingly accepted on GCC project BOMs as a cost-competitive alternative.

Specifications of the Fitok part

Tube OD
3/4 inch
Connection Type
Double-ferrule compression (both ends)
Material
SS316
Fitting Type
Straight union
Series
U Series
End Configuration
Tube x Tube

We carry DU-12-S as the indSpare-stocked equivalent. Looking for a different brand? Request a quote →

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