Swagelok® Fittings
Cross-Referenced to Spec-Matched Parts

When a compression fitting fails in a high-pressure gas line, you do not have time to wait on a vendor quote. You need the exact replacement identified, confirmed, and on its way in the same hour. USASuperlok.com stocks Superlok replacements for Swagelok® fittings across thousands of configurations, all machined to Swagelok® dimensional specs. Type in your old part number. Get the exact match. It ships from our US warehouse today.

In semiconductor fabs, oil refineries, and high-pressure gas distribution systems, instrumentation connections run at the edge of their pressure and temperature ratings every day. A compression assembly that does not match tube OD, ferrule geometry, or body thread taper exactly is a failure waiting to happen. USASuperlok.com keeps a massive domestic inventory of Swagelok® alternatives ready to move fast. The part you need is here.

Compression Sleeve Design Delivers a Leak-Free Bite on the First Installation

The front ferrule in a compression assembly is a precision sleeve. It has to deform at a specific contact angle to produce a gas-tight seal on the tube OD. Too shallow an angle and the bite is weak. Too steep and the tube wall collapses. Our compression sleeves are machined to the same ferrule seat geometry and contact angle as Swagelok® originals. The bite is correct at 1.25 turns from finger-tight, the first time and every time.

Front compression sleeve bites tube OD at the correct angle for a gas-tight metal-to-metal seal
Back ferrule drives the sleeve forward and locks the tube against vibration-induced pull-out
Standard 1.25-turn pull-up produces a repeatable seal across all OD sizes and tubing materials
Available in 1/16" through 1" tube OD in both inch and metric configurations
Compatible with 316 SS, 304 SS, copper, and carbon steel instrumentation tubing

Our union tube fittings cover the most common process instrumentation sizes and are in stock without any lead time.

NPT and Tube-End Body Threads Seat in Your Existing Ports Without Modification

An NPT connection depends on a specific thread taper to produce a seal as you tighten. A fitting body that is off on taper angle will never seal correctly in an existing port. Our fitting bodies are machined to ASME B1.20.1 tolerances for all NPT connections. Tube-end body threads match Swagelok® instrumentation specs so they install in the same ports at the same torque. No re-tapping. No thread chasing. No rework.

These compression components are safe to combine with existing Swagelok® hardware. Use our part number cross-reference tool to match any Swagelok®, Parker, Hy-Lok, or DK-Lok part number to our catalog instantly.

NPT male connectors machined to ASME B1.20.1 taper for correct seal in existing port hardware
Tube-end body threads match Swagelok® male connector specs for direct one-for-one replacement
Face-to-face body lengths match originals for manifold block and panel-mount applications
Full range of body styles: male connectors, female connectors, bulkheads, elbows, tees, adapters
Cross-reference database covers Swagelok®, Parker, Hy-Lok, Ham-Let, and DK-Lok part numbers

Heat Code Stamped 316 SS Stops Galvanic Corrosion Where the Ferrule Bites

Galvanic corrosion is a materials problem, not a maintenance problem. It starts the moment two different alloys make electrical contact in a wet or corrosive environment. At a compression fitting, the highest-risk point is exactly where the ferrule contacts the tube wall under permanent cold-work stress. Carbon steel ferrules against stainless tubing in a chloride environment will corrode right there, below the nut, completely out of sight.

Our ferrule sets and fitting bodies are both 316 stainless steel. A heat code is stamped on every fitting body and traceable to the original billet at the mill.

316 SS ferrules and bodies machined from the same alloy billet to eliminate galvanic risk
Heat code stamped on every fitting body for traceability to original mill production cert
316 SS resists pitting and crevice corrosion in seawater, chloride, and sour gas environments
Hastelloy, Monel, and Inconel alloy options available for extreme acid and chemical service
NACE MR0175 compliant alloy options for sour gas, H₂S, and aggressive process streams

Your safety inspector pulls the heat code off the body and traces it to the production batch. Full material documentation from raw bar to installed connection.

Find Your Exact Part in Seconds

Enter any Swagelok®, Parker®, HyLok®, or other brand part number to instantly find our compatible alternative. Over 10,000 parts in our database.

Popular Swagelok® Alternatives

SS-MD-4

Stainless Steel Vent Protector – 1/4 in.

SS-1610-3

Stainless Steel Union Tee – 1 in.

SS-2400-9

Tube Fitting, Union Elbow – 1-1/2 in

SS-600-6

SS Tube Fitting, Union - 3/8 in.

SS-6NBS6

Needle Valve – 3/8 in.

SS-4R3A5

Relief Valve – 1/4 in.

SS-4CP2-1

One-Piece Check Valve – 1/4 in.

SS-QC4-B-400

Quick Connect Body, 1/4 in.

Compatible with Leading Brands

Can’t find your part? Send us your part number, and we’ll find the perfect match.

Nuclear and Marine Certifications Prove Our Compression Hardware Performs

Standard ISO 9001 manufacturing controls are the floor, not the ceiling. Nuclear facilities, marine vessels, and LNG platforms require compression hardware tested and approved for specific service conditions. Our tube fittings carry certifications that go well beyond standard manufacturing quality systems. If the ball valves and instrumentation components in those same critical systems also need certification coverage, those are under the same program.

ISO 9001 certified manufacturing with documented in-process controls on every production run
Nuclear N Stamp certification for nuclear power plant instrumentation service
TUV, DNV, and Lloyd's Registry certifications for marine and offshore applications
Hydrostatic burst tested to 1.5x working pressure by independent third-party labs
Full test reports and certification documentation available for project QC packages

When your project QC package requires third-party certification documentation, the files are ready.

Instant Part Number Lookup Ships the Right Compression Hardware From US Stock

Single-supplier dependence turns a routine replacement into a multi-week delay every time that supplier is backordered. USASuperlok.com maintains a large US domestic inventory of compression hardware across thousands of configurations. Enter your old Swagelok® fittings part number. The system returns the exact Superlok match. It ships the same day.

Massive US domestic inventory with no international lead times on standard configurations
Instant part number lookup returns the exact replacement for Swagelok®, Parker, and Hy-Lok parts
Same-day shipping available on all stocked compression hardware configurations
Fluid system specialists available to verify your part match and confirm specs before order
No minimum order quantity on standard compression hardware sizes

Stop absorbing your vendor’s supply chain problems. Find the Swagelok® fittings replacement your system needs at USASuperlok.com and get back to work.