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Parker Hydraulic Hose Decoder

Type a Parker 4400 hose part number (387-8, 471TC-6, 302-16, 797-16) and read the hose ID, OD, the working pressure for that exact size, minimum bend radius, construction, cover, and the matching fitting series. Built around the trap that a legacy hose drops its pressure as the size grows, so the rating has to be read per size, not per series.

A part-number decoder for Parker Catalog 4400 hydraulic hose. Type a part number (a 3-digit series, a cover suffix TC or ST that is optional on most series but required on the cover-only series 471, 472, and 482, a dash size, and an optional twin dash) and the decoder returns the family and spec, the hose inside diameter as the dash size in inch and Parker's published mm, the outside diameter, the working pressure in psi and MPa for that exact size, the minimum bend radius, the construction (wire braids or spirals), the cover style and what it changes, the matching fitting series, the vacuum rating where published, and whether the hose is a constant-pressure GlobalCore or a size-varying legacy series. The lookup key is the (series, dash) pair because a legacy SAE hose drops its working pressure as the ID grows: a 422-4 is 3250 psi and a 422-32 is 575 psi, the same hose, a 5.6x spread. The decoder reads the value per size from the catalog table, never one number for the whole series, and it never fabricates a pressure for a size that is not in the table.

Pro Tip: Two things bite. First, the dash is the hose inside diameter in 1/16 inch, so -8 is 8/16 = 1/2 inch. The fitting and thread sizes have their own size boxes in the assembly part number, so the hose dash is not automatically the fitting dash. Second, and this is the expensive one, a legacy SAE series (302, 422, 471, 482) is not one pressure. The working pressure drops as the hose gets bigger, sometimes by a factor of five across the size range. If you read the rating off the small size and apply it to the big size, you can be off by thousands of psi. GlobalCore series (187, 387, 487, 722, 777, 787, 797) are the opposite: they hold one working pressure across every size, which is the whole point of that family. The decoder labels which behavior you are looking at on every result. And the TC or ST cover suffix is an abrasion and temperature feature, not a pressure upgrade: strip it to find the base hose and its rating.

Read the Parker Hydraulic Hose Guide for the full 4400 part-number structure, the cover suffixes, GlobalCore vs legacy pressure behavior, and the size-dependent fittings

Parker Hydraulic Hose Guide →

Size the flow and pressure drop through the decoded hose inside diameter

Pipe / Hose Pressure Drop Calculator →

Check the heat the hydraulic circuit rejects, which sets the cooling and the hose temperature derate

Hydraulic Heat Load Calculator →

Size a bladder or piston accumulator on the same circuit

Accumulator Sizing Calculator →

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Parker Hydraulic Hose Decoder
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How It Works

  1. Type the part number

    Enter a Parker 4400 hose part number: the 3-digit series, an optional cover suffix (TC for ToughCover, ST for SuperTough), the dash size, and an optional second dash for a twin line. Examples: "387-8", "471TC-6", "722TC-20", "471TC-6-6". Lowercase and spaces are tolerated.

  2. Read the size

    The Size and dimensions card shows the dash decoded as the hose inside diameter in 1/16 inch, in both the fraction inch and Parker's published mm (the published mm is used as printed, not recomputed from the dash), plus the outside diameter and the governing SAE/ISO/EN spec.

  3. Read the working pressure for that exact size

    The Pressure and bend card shows the working pressure in psi and MPa for the size you entered, the minimum bend radius, and the vacuum rating if published. A callout states whether the series is constant-pressure GlobalCore or a size-varying legacy hose, and on a legacy hose it reminds you the pressure applies to that size only.

  4. Check construction and cover

    The Construction and cover card shows the reinforcement (wire braids or spirals, which can change within a series by size), the cover style, and the temperature range. If you entered a TC or ST cover, the card explains it changes abrasion and temperature, not pressure.

  5. Read the fittings

    The Fittings card lists the matching fitting series and flags a Push-Lok push-on hose (no crimp). It reminds you that the correct crimp series can shift between the small and large sizes, and that the crimp diameter and insert come from the Parker tooling chart, not a calculation.

  6. Export the decode

    PDF export produces a branded report with the decoded properties, the field notes, and the full size table for the decoded series, so the size-varying pressure is visible at a glance. CSV export packages the same fields, and the share button puts the exact part number in a coworker browser.

Built For

  • A mechanic holding a blown hose stamped "302-16" and needing the ID, the working pressure for that exact size, and the bend radius to build a replacement
  • A hydraulics tech confirming that a 422-32 is 575 psi, not the 3250 psi printed on the 422-4 fitting chart he was looking at
  • A parts buyer decoding "471TC-6" and learning the TC is a ToughCover, the same hose pressure as a plain 471, before sourcing a substitute
  • A field tech telling a GlobalCore 722-8 (4000 psi, constant) from a 722TC-20 (R12 4-spiral, size-varying), which are different hoses that share the leading number
  • An estimator decoding "471TC-6-6" and catching that it is a bonded twin line, not two single hoses
  • A maintenance planner confirming an 811-16 is a low-pressure suction hose with a vacuum rating, not a pressure line
  • A shop hand decoding "801-8" and learning it is a Push-Lok push-on hose that does not crimp, so it needs 82-series push-on fittings
  • A reliability engineer pulling the full 387 size table into a PDF to spec a fleet of hoses off one document

Features & Capabilities

Per-Size Working Pressure

The decoder reads the working pressure for the exact dash size from the catalog table, not one number for the series. On a legacy SAE hose the pressure drops as the size grows (422-4 is 3250 psi, 422-32 is 575 psi), so a per-series number would be wrong by up to 5x. The (series, dash) lookup is the core of the tool.

GlobalCore vs Legacy, Labeled

Every result says whether the hose is a constant-pressure GlobalCore series (one pressure across all sizes, the ISO 18752 design) or a size-varying legacy SAE series. The pressure callout changes wording and color to match, so you know at a glance whether stepping the size changes the rating.

Cover Suffix Decoded as a Feature, Not a Pressure

TC (ToughCover) and ST (SuperTough) are decoded as abrasion and temperature features. The decoder strips the cover suffix to find the base series and reports the base pressure, and it states plainly that the cover does not change the working pressure. A 387, 387TC, and 387ST all read the same 3000 psi.

The 722 vs 722TC Distinction

The 722 number covers two different hoses, and the dash size tells them apart. In the small sizes, 722 (and its 722TC and 722ST tough-cover versions) is the GlobalCore 4000 psi constant-pressure hose. In the large sizes (-20, -24, -32), 722TC and 722ST are the SAE 100R12 four-spiral, a size-varying hose. The decoder resolves dash-aware, so 722TC-8 returns the GlobalCore hose with a ToughCover and 722TC-20 returns the R12.

Twin Line and Push-Lok Flags

A trailing second dash (471TC-6-6) is flagged as a bonded twin line. Push-Lok push-on series (801, 836, 821) are flagged as no-crimp, low-pressure hoses that use 82-series push-on fittings, and suction series (811, 881) are flagged with their vacuum rating, so a low-pressure hose is never mistaken for a pressure line.

Never Fabricates a Pressure

If you enter a size that is not in the catalog table for a recognized series, the decoder says so and lists the sizes it does have, rather than guessing a pressure. Working pressure is safety-relevant, so the tool refuses to interpolate one.

PDF and CSV Export with the Full Size Table

PDF export uses the shared ToolGrit programmatic generator and appends the full (series, dash) size table for the decoded series, so the size-varying pressure is visible across the whole range on one page. CSV export packages the decoded fields, and the share button rebuilds the decode in a coworker browser.

Light and Dark Mode, WCAG AA

Standard ToolGrit light and dark theme with WCAG AA contrast on the pressure-behavior callouts, verified in both themes. The matched banner and the pressure card use aria-live regions so screen readers announce the decode and the pressure when the part number changes. The mobile layout at 375 px keeps the cards readable.

Comparison

Series Spec Behavior WP at -8 WP at -32 Crimp
187 ISO 18752 GlobalCore Constant 1000 psi 1000 psi yes
387 ISO 18752 GlobalCore Constant 3000 psi 3000 psi yes
797 ISO 18752 GlobalCore Constant 6000 psi 6000 psi yes
302 SAE 100R2 / ISO 2SN Size-varying 4000 psi 1150 psi yes
422 SAE 100R1 / ISO 1SN Size-varying 2325 psi 575 psi yes
471TC ISO 2SC / EN 857 Size-varying 4250 psi n/a (to -16) yes
722TC SAE 100R12 / R12 Size-varying n/a (-20 up) 2500 psi yes
811 SAE 100R4 suction Low pressure n/a (-12 up) 100 psi yes
801 Push-Lok multipurpose Low pressure 300 psi n/a NO (push-on)

References

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Frequently Asked Questions

It is the hose inside diameter in 1/16 inch. So -8 is 8/16 inch, which is 1/2 inch; -16 is 16/16, which is 1 inch. This is the hose ID. The fittings and threads on the assembly have their own size designations in separate boxes of the full part number, so the hose dash is not automatically the fitting or thread dash.
On a legacy SAE hose (302, 422, 471, 482), the reinforcement is sized to the hose, and a bigger ID at the same wall holds less pressure, so the working pressure drops as the size grows. A 422-4 is 3250 psi and a 422-32 is 575 psi, the same hose, a 5.6x spread. That is why you have to read the rating for the exact size. GlobalCore series (187, 387, 487, 722, 777, 787, 797) are engineered to hold one working pressure across the whole size range, which is the point of that family.
They are cover styles. TC is ToughCover, a more abrasion-resistant cover (about 80 times standard rubber per ISO 6945). ST is SuperTough, the most abrasion-resistant cover (about 450 times standard), for severe rub. Neither changes the working pressure, the ID, or the bend radius of the hose. They protect the cover in a harsh routing. The decoder strips the suffix to find the base hose and reports the base pressure.
It depends on the size, which is the trap. In the small sizes, 722 and its 722TC and 722ST tough-cover versions are the GlobalCore 4000 psi constant-pressure hose. In the large sizes (-20, -24, -32), 722TC and 722ST are the SAE 100R12 four-spiral, a size-varying hose, a different product that shares the leading number. So 722TC-8 is the GlobalCore hose with a ToughCover, while 722TC-20 is the R12. The decoder reads the dash to pick the right table.
It is a bonded twin line: two hoses joined side by side, common on equipment where two lines run together. The first dash is the hose ID (here -6, 3/8 inch) and the repeated dash indicates the twin construction. Order and route it as a twin, not as two separate single hoses.
No. It decodes the hose part number and tells you the matching fitting series, but the exact crimp diameter and insert are set by the Parker tooling chart (Catalog 4480-T20) for the specific hose and fitting combination, not by a calculation. Use the decode to identify the hose, then look up the crimp spec in the Parker tooling data. The decoder also reminds you that the correct fitting series can shift between the small and large sizes of a series.
No. The working pressure is the maximum the hose is rated to operate at continuously. The burst pressure is much higher, roughly four times the working pressure on Parker hydraulic hose, and it is a test value, not an operating limit. Always design to the working pressure, and derate it for fluid temperature. The decoder reports the working pressure and says so.
Disclaimer: This decoder reads Parker Catalog 4400 hydraulic hose part numbers against the published catalog tables. Working pressure, bend radius, dimensions, cover options, and the matching fitting series vary by exact size and between catalog revisions; working pressure is not burst pressure and must be derated for fluid temperature; and the crimp specification comes from the Parker tooling chart (Catalog 4480-T20), not this tool. Use it to identify a hose and read its size-specific rated values only: always verify the final part number, pressure rating, and crimp against the current Parker catalog and tooling data before building, installing, or pressurizing an assembly. This is reference decode, not a build or installation ruling, and ToolGrit is not affiliated with Parker Hannifin.

Learn More

Industrial

Parker Hydraulic Hose Guide: The 4400 Part Number, GlobalCore vs Legacy Pressure, TC/ST Covers, and Fittings

Plain-language Parker Catalog 4400 hose reference. How to read the series, cover, and dash (the dash is the hose ID in 1/16 inch); why a legacy SAE hose drops its working pressure as the size grows while GlobalCore holds a constant pressure; what the TC and ST covers change; the 722 vs 722TC trap; and why the matching fitting series shifts with size. Companion to the Parker Hydraulic Hose Decoder.

Read Guide →

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