DK-LOK

DK-LOK Compression Tube Straight Fitting, 3/16" Tube OD x 1/8" Male NPT, SS316, DMC-3-2N-S

Mfr. part no.: DMC-3-2N-S
SKU: DK-VA34860203

DK-LOK compression tube fittings use a proven double ferrule design to deliver dependable, leak‑tight connections for instrumentation and process tubing. Suitable for demanding service where vibration and pressure cycling are present.

1 document 5 cross-references

Specifications

Connection Size (End 1)	3/16" Tube OD
Connection Size (End 2)	1/8" Male NPT
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
Threaded end for easy transition between tubing and NPT pipe thread

Description

DK-LOK DMC Series straight tube-to-male NPT fitting with a 3/16" compression tube end and a 1/8" male NPT threaded end. 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

PDF, 6.2 MB Download

Cross-reference

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

Swagelok SS-300-1-2

3/16" Tube OD x 1/8" Male NPT SS316 Compression Straight Connector

Swagelok SS-300-1-2 is a straight tube fitting connector with a 3/16" compression (double-ferrule) tube end and a 1/8" male NPT threaded end, manufactured in 316 stainless steel. The Swagelok double-ferrule design provides leak-tight, vibration-resistant connections in instrumentation and process systems. Widely accepted as the industry benchmark for this fitting type.

Specifications of the Swagelok part

Tube OD: 3/16"
Thread: 1/8" Male NPT
Material: SS316
Design: Double ferrule compression
End Connection 1: Compression tube
End Connection 2: Male NPT

Hy-Lok CMC-3-2N-S316

3/16" Tube OD x 1/8" Male NPT SS316 Compression Straight Connector

Hy-Lok C-series straight compression fitting with 3/16" tube OD double-ferrule end and 1/8" male NPT, in 316 stainless steel. Hy-Lok fittings are manufactured to the same dimensional and pressure standards as DK-LOK and Swagelok, and are widely accepted as drop-in replacements in instrumentation systems. Hy-Lok is a South Korean manufacturer with strong GCC distribution presence.

Specifications of the Hy-Lok part

Tube OD: 3/16"
Thread: 1/8" Male NPT
Material: SS316
Design: Double ferrule compression
End Connection 1: Compression tube
End Connection 2: Male NPT

Gyrolok (Crawford/Hoke) 3CM2316

3/16" Tube OD x 1/8" Male NPT SS316 Gyrolok Compression Straight Connector

HOKE Gyrolok 3CM2316 male connector: 3/16" double-ferrule compression tube end to 1/8" male NPT, 316 stainless steel. Listed in the Gyrolok catalogue and in HOKE's online catalogue as tube O.D. 3/16 in, pipe thread 1/8 NPT, material 316 stainless steel. Gyrolok is a long-established double-ferrule design widely specified in oil and gas and petrochemical instrumentation. This cross-reference was matched on tube outside diameter, NPT size, thread gender, body material and ferrule arrangement. As with any two-ferrule design, components from different makes should not be intermixed; substitute the complete fitting.

Specifications of the Gyrolok (Crawford/Hoke) part

Tube OD: 3/16"
Thread: 1/8" Male NPT
Material: SS316
Design: Double ferrule (Gyrolok)
End Connection 1: Compression tube
End Connection 2: Male NPT

Parker 3MSC2N-316

3/16" Tube OD x 1/8" Male NPT SS316 A-Lok Compression Straight Connector

Parker A-Lok (CPI) series straight connector with 3/16" compression tube end and 1/8" male NPT, in 316 stainless steel. Parker's A-Lok double-ferrule system is a recognised equivalent to Swagelok and DK-LOK designs, offering comparable pressure ratings and leak-tight performance for instrumentation tubing. Commonly specified as an interchangeable alternative in GCC oil & gas procurement.

Specifications of the Parker part

Tube OD: 3/16"
Thread: 1/8" Male NPT
Material: SS316
Design: Double ferrule (A-Lok)
End Connection 1: Compression tube
End Connection 2: Male NPT

Superlok (BMT) SMC-3-2N-S316

3/16" Tube OD x 1/8" Male NPT SS316 Superlok Compression Straight Connector

Superlok SMCS series straight compression fitting with 3/16" double-ferrule tube end and 1/8" male NPT, in 316 stainless steel. Superlok (BMT, South Korea) produces fittings dimensionally compatible with Swagelok and DK-LOK, and is increasingly accepted in GCC oil & gas instrumentation projects as a cost-competitive alternative. Double-ferrule design provides equivalent grip and sealing performance.

Specifications of the Superlok (BMT) part

Tube OD: 3/16"
Thread: 1/8" Male NPT
Material: SS316
Design: Double ferrule
End Connection 1: Compression tube
End Connection 2: Male NPT

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