Swagelok Tube-Fitting Part-Number Decoder Skip to main content
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Swagelok Tube-Fitting Decoder

Reads a Swagelok tube-fitting ordering number into its material, tube OD, fitting configuration, and end connection. It handles the size-code quirk that makes 1/2 in read as 810, not 800, and it never converts a size by arithmetic.

This decoder takes a Swagelok ordering number such as SS-400-1-4 and splits it into four plain-language facts: the material (for example, 316 stainless steel), the tube OD, the fitting configuration (male connector, union, union elbow, and so on), and the second-end connection (for example, 1/4 in male NPT). It works from the MS-01-140 ordering grammar (the A Material / B Size / C Series / D Component / E Fitting Type / F Second End Size / G Second End Type sequence) and reads every tube OD from the published size-code table. The fiddly part of a Swagelok code is the size group: 810, 1210, and 1610 are not opaque numbers, they fold a size digit, a series digit, and a component digit together, so the 1 in 810 is the series field, not part of the tube size. That is why 1/2 in is 810 and not 800, and why 1 1/4 in returns to 2000. The decoder reports geometry only. It deliberately makes no claim about pressure rating, temperature rating, material compatibility, leak-tightness, tube-wall selection, ferrule reuse, or service suitability. Unknown materials, sizes, or fitting codes are flagged, never guessed.

Pro Tip: The size code is not arithmetic. The 1 in 810, 1210, and 1610 is the series digit for the 1/2 in to 1 1/8 in range, so 1/2 in is 810, not 800, and 1 in is 1610. Above that range the series digit returns to 0, so 1 1/4 in is 2000, not 2010. The decoder reads the OD straight from the published size-code table, which is exactly why a typo like SS-800-1-8 gets flagged instead of being silently "fixed" to 1/2 in.

Decode the pipe or tube spec the fitting connects to

ASTM Pipe Spec Decoder →

Identify the grade of the hardware on the same assembly

Bolt Grade Marking Decoder →

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Swagelok Tube-Fitting Decoder
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How It Works

  1. Type or paste the part number

    Enter a Swagelok ordering number in the input box, for example SS-400-1-4, SS-810-1-8, or SS-400-6. Case and spacing are normalized, so ss 400 1 4 resolves the same as SS-400-1-4. You can also load one of the built-in examples to see the format.

  2. Read the part-number breakdown

    The colored breakdown strip shows each segment of the code mapped to its meaning: material prefix, tube-OD size code, fitting type, and any second-end size or type token. This is where you can see exactly which digit produced which result.

  3. Check the identity card and decode basis

    The identity card states the material, tube OD, configuration, and end connection in one line, plus a status. verified-row means the whole part number was confirmed against a Swagelok product listing. in-grammar means every token is legal but that exact part was not individually confirmed. needs-source and invalid tell you the decode is not trustworthy and why.

  4. Read the field notes and source boundary

    The field notes spell out what the decoder does NOT tell you (no pressure, temperature, compatibility, leak-tightness, tube-wall, or ferrule-reuse claims) and call out any grammar-derived size codes. The source card names the MS-01-140 catalog the grammar came from.

  5. Export or share if you need a record

    Use the share button for a URL that reopens the same decode, or export a CSV or branded PDF of the decoded fields for an RFQ, a takeoff, or a work-order note. Verify against the Swagelok catalog and the actual part label before you order or install.

Built For

  • A planner pulling a spare from the crib reads SS-400-1-4 off the bag and confirms it is a 316 stainless male connector, 1/4 in tube OD by 1/4 in male NPT, before it goes on the work order.
  • A buyer cross-checking a brass line item decodes B-400-1-4 to confirm the prefix B means brass and the geometry matches the 316 stainless SS-400-1-4 it was being substituted for.
  • An instrument tech wiring up an impulse line hits the 810 quirk: SS-810-1-8 decodes to a 1/2 in tube OD male connector with 1/2 in male NPT, confirming the 8 in 810 is the size and the 1 is the series digit.
  • A maintenance lead identifies an unmarked straight coupling as SS-400-6, a 1/4 in union (tube by tube, no NPT), versus SS-400-9, a 1/4 in union elbow, so the right one gets ordered.
  • A reliability engineer decodes SS-1610-6 to confirm the 1610 size code means 1 in tube OD on a union, not 16 in or some larger size, when reading a P&ID bill of materials.
  • A procurement clerk pastes SS-600-1-6 and confirms the trailing 6 means 3/8 in male NPT, matching the 3/8 in tube OD, before approving the line.
  • A QA reviewer feeds a suspected typo SS-400-99 into the tool and gets an invalid flag because 99 is not a documented fitting-type code, catching a bad part number before it reaches a vendor.

Features & Capabilities

Reads geometry from the MS-01-140 grammar

Decodes the four fields a tube-fitting ordering number actually encodes: material, tube OD, fitting configuration, and second-end connection. The configuration is row-backed against the catalog fitting-type list, not inferred from a stray digit.

Material prefixes including SS (316 stainless), B (brass), S (carbon steel), and alloys 400, 600, 625, 825, 2507, C-276 Fitting types: male/female connector, union, union elbow, union tee, union cross, caps, plugs, reducers, and more Second-end NPT sizes 1/16 in through 1 in from the male-connector NPT table Default rule: no end-type suffix on a connector means male NPT

Table-read size codes, no arithmetic

Every tube OD comes from the published size-code table, so the series-digit quirk is handled correctly instead of being computed. A code that is not in the table is refused rather than converted.

1/2 in resolves to 810 (series digit 1), not 800 1 1/4 in resolves to 2000 (series returns to 0), not 2010 Size codes 100 through 3200 covering 1/16 in to 2 in tube OD An unlisted size code such as 700 or 999 is flagged invalid, never guessed

Honest status on every decode

Each result carries a status so you know how far to trust it. Confirmed product rows are separated from grammar-only decodes, and anything unconfirmed or out of scope is called out plainly.

verified-row: whole part confirmed against a Swagelok product listing in-grammar: legal grammar, not individually confirmed needs-source: recognized but unconfirmed (metric, a non-NPT end type, a -3/-5/-10 token, or an unparsed tee/cross size token) invalid: unknown material, size, or fitting code

Records and crosslinks

Outputs are shareable and exportable for procurement and planning paperwork, with links to the related ToolGrit decoders for the rest of the assembly.

Shareable URL that reopens the same decode CSV and branded PDF export of the decoded fields Crosslink to the ASTM Pipe Spec Decoder for the connected pipe or tube Crosslink to the Bolt Grade Marking Decoder for hardware on the same assembly

Assumptions

  • The input is a Swagelok gaugeable tube-fitting or adapter-fitting ordering number that follows the MS-01-140 sequence: material, size code, fitting type, optional second-end size and type.
  • Sizes and NPT labels are reported in inches exactly as Swagelok states them; the size code is read from the published table, never derived by arithmetic.
  • When a connector carries a trailing size digit with no end-type suffix, that second end is male NPT, per the catalog NPT ordering-number table.
  • verified-row results reflect a part number confirmed against a live Swagelok product listing; in-grammar results are legal under the grammar but were not individually confirmed against a product row.
  • The catalog ordering grammar (A Material through G Second End Connection Type) is treated as the system of record for the part-number structure.
  • Fractional inch fittings are the V1 scope; metric M-series codes are recognized but treated as out of scope, not decoded to a metric OD.

Limitations

  • It reports geometry only: material name, tube OD, fitting configuration, and end connection. It does NOT state or imply pressure rating, temperature rating, material compatibility, leak-tightness, tube-wall selection, ferrule reuse, or suitability for any service.
  • Metric (M-series) fittings and metric tube ends are out of V1 scope and are flagged needs-source, not decoded to a millimeter OD.
  • Non-NPT end types (ISO/BSP parallel or tapered, AN flare, weld, bored-through, knurled-nut, O-seal, SAE straight-thread) are recognized as tokens but not decoded to a concrete end geometry in V1; they return needs-source. Only the female-thread end type (F) is decoded alongside male NPT.
  • Trailing second-end tokens -3 (3/16), -5 (5/16), and -10 (5/8) are documented tube sizes but are not confirmed as male-NPT second ends in the rows read, so they are flagged needs-source rather than decoded as NPT.
  • Tee and cross ordering numbers carry run and branch size tokens that are not free-parsed in V1; an extra token on a tube-by-tube fitting returns needs-source rather than a confident decode.
  • The 1 1/8 in size code (1810) is grammar-derived, not independently confirmed against a product row, and is noted as such on output.
  • It does not decode valves, hose, quick-connects, weld fittings, or custom and special-order parts, and it is not affiliated with Swagelok; always verify against the Swagelok catalog and the physical part label before ordering or installing.

References

  • Swagelok Gaugeable Tube Fittings and Adapter Fittings Catalog, MS-01-140, Additional Ordering Information page (A Material / B Size (Tube OD) / C Series / D Component / E Fitting Type / F Second End Connection Size / G Second End Connection Type). Exact revision marker is still to be pinned; the cached download is dated 2026.
  • Swagelok MS-01-140, Union ordering-number table (-x0-6 rows), used to cross-read the size-code-to-tube-OD mapping (100 through 2000).
  • Swagelok MS-01-140, Male Connector NPT ordering-number table (-x0-1-y rows), used for the trailing second-end NPT size codes (1/16 in through 1 in).
  • Swagelok product pages for SS-400-1-4, B-400-1-4, SS-600-1-6, SS-810-1-8, SS-400-6, SS-400-9, and SS-1610-6, used as row-level validation for the verified-row results.
  • ASTM Pipe Spec Decoder (ToolGrit) for the pipe or tube spec the fitting connects to.
  • Bolt Grade Marking Decoder (ToolGrit) for identifying the grade of hardware on the same assembly.

Frequently Asked Questions

Because the visible size code is a size digit plus a series digit plus a component digit, not a single number. For 1/2 in through 1 1/8 in the series digit is 1, so size digit 8 plus series 1 gives 810. Below 1/2 in the series digit is 0 (so 1/4 in is 400), and from 1 1/4 in up it returns to 0 again (so 1 1/4 in is 2000). The decoder reads the OD from the published size-code table, so it gets this right instead of treating 810 as eight hundred.
On a male connector with no end-type suffix, the trailing digit is the male NPT pipe size. In SS-400-1-4 the 4 means 1/4 in male NPT, paired with the 1/4 in tube OD from the 400 size code. The decoder reads these from the catalog male-connector NPT table. A trailing token that is not a confirmed NPT size, such as -3, -5, or -10, is flagged needs-source rather than decoded.
No, and that is by design. The decoder reports geometry only: material name, tube OD, configuration, and end connection. It makes no claim about pressure rating, temperature rating, material compatibility, leak-tightness, tube-wall selection, or ferrule reuse. Confirm all of those from the Swagelok catalog and your own engineering review.
verified-row means the whole part number was confirmed against a Swagelok product listing, the highest confidence. in-grammar means every token is a legal catalog value but that exact part was not individually confirmed. needs-source means the code is recognized but its meaning here is unconfirmed (for example a metric code, a non-NPT end type, a -3/-5/-10 token, or an unparsed tee/cross size token). invalid means a token is not a legal catalog value, so it is not treated as a real product.
Not in V1. Metric M-series sizes and non-NPT end types (ISO/BSP, AN flare, weld, bored-through, knurled-nut, O-seal, SAE straight-thread) are recognized as tokens but returned as needs-source rather than decoded to a concrete geometry. Only fractional-inch fittings with male NPT or female-thread (F) ends are decoded to a result.
BT is a second-end connection type (bored-through fitting) in the catalog, not a material designator, so using it as a leading prefix is invalid. SS-400-99 is rejected because 99 is not a documented fitting-type code, and the decoder never guesses a configuration from a stray numeric suffix. Unknown materials, sizes, and fitting codes are flagged so a bad part number gets caught before it reaches a vendor.
Disclaimer: This decoder reports geometry only: material name, tube OD, fitting configuration, and end connection, decoded from the published Swagelok MS-01-140 ordering grammar. It does not state or imply pressure rating, temperature rating, material compatibility, leak-tightness, tube-wall selection, ferrule reuse, or suitability for any service. ToolGrit is not affiliated with Swagelok. Product availability, catalog content, and the exact MS-01-140 revision can change. Always verify the decoded values against the current Swagelok catalog and the physical part label, and apply your own engineering review, before ordering or installing.

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