Product Focus
Sakagami Profiles — Complete Summary
One-page summary of every Sakagami Seisakusho seal profile: hydraulic, pneumatic, dust seals, wear rings and accessories with material, pressure, speed and temperature ratings.
- Reading
- 5 min
- Updated
- 2026-07-23
- Published
- 2026-07-23
- Category
- Product Focus
A single-page reference to the Sakagami Seisakusho seal profile catalogue — every hydraulic, pneumatic, dust and accessory profile with its material, service pressure, speed and temperature. Use this as an index when specifying or cross-referencing a Sakagami profile before opening the individual profile PDF.
Profile type comparison
Side-by-side view of the five Sakagami profile families — what each group does, the pressure and speed envelope, typical materials and where each is used. Use it to pick the right family before drilling into an individual profile.
| Family | Primary role | Typical pressure | Typical speed (m/s) | Temp. range (°C) | Common materials | Typical application | Catalogue pages |
|---|---|---|---|---|---|---|---|
| Hydraulic packings | Dynamic pressure seal — piston / rod | 14–35 MPa (up to 35 MPa with back-up) | 0.5–1 (3 for PTFE ST-family) | −45 to 100 (−5 to 150 with FKM) | NBR (RN-series), FKM (RF), PTFE (PT) | Hydraulic cylinders, presses, mobile plant | pp. 2–3 overview · profile sheets pp. 8–29, p. 41 |
| Pneumatic packings | Low-friction sealing on air | ≤ 1 MPa (0.8 MPa for mini) | 0.4–1 | −25 to 70 (−5 to 150 with FKM) | NBR (RN713/722/818), non-lube (RK701) | Pneumatic cylinders, solenoid valves, mini bores | pp. 4–5 overview · profile sheets pp. 30–40 |
| Dust seals / wipers | Contamination exclusion on rod | Not pressure-rated | 0.5–1 | −45 to 100 | NBR (RN807/814/906/912), fibre (BF001) | Rod ingress protection ahead of primary seal | pp. 6–7 overview · profile sheets pp. 42–51 |
| Wear rings / bearings | Side-load support, prevent metal contact | Up to 21 MPa (back-up types) | 1–3 | −55 to 120 | Phenolic fabric (PB201/251), PA (PN104) | Piston / rod guidance in hydraulic and pneumatic cylinders | pp. 6–7 overview · profile sheets pp. 52–58 |
| Accessories | Cushioning, back-up, metal scraping | 1–21 MPa (profile-specific) | 0.3–1 | −55 to 100 (≤150 for heat-resistant) | NBR (RN803), PTFE (PT111/151/154), brass coil (C5191W) | Stroke-end cushioning, high-pressure back-up, weld spatter removal | pp. 6–7 overview · profile sheets pp. 59–62 |
Hydraulic packings
U-cup, chevron and PTFE-composite profiles for hydraulic cylinder piston and rod sealing. NBR (RN-series) for general mineral-oil duty, low-temperature NBR grades for T-series, and PTFE + O-ring composites for the ST-family low-friction duty.
| Profile | Use | Material | Max pressure MPa {kgf/cm²} | Max speed (m/s) | Temp. (°C) |
|---|---|---|---|---|---|
| GPY | Piston | RN919 | 17.5 {175} / 25 {250} w/ back-up / 35 {350} std+HP | 1 | −30 to 100 |
| GNY | Rod | RN919 | 17.5 {175} / 25 {250} w/ back-up / 35 {350} std+HP | 1 | −30 to 100 |
| RGY | Piston | RN923 | 14 {140} / 21 {210} w/ back-up / 28 {280} std+HP | 1 | −25 to 100 |
| RNY | Rod | RN922 | 14 {140} / 21 {210} w/ back-up / 28 {280} std+HP | 1 | −25 to 100 |
| SGY (T) | Piston | RN812 | 21 {210} w/ back-up | 0.5 | −45 to 100 |
| SNY (T) | Rod | RN809 | 21 {210} w/ back-up | 0.5 | −45 to 100 |
| SKY | Piston & rod | RN906 (RF905/RF907) | 14 {140} / 21 {210} / 28 {280} | 1 (0.5) | −10 to 80 (−5 to 150) |
| KY | Piston & rod | RN906 (RF905/RF907) | 15 {150} / 30 {300} / 35 {350} | 1 (0.5) | −10 to 80 (−5 to 150) |
| RGU | Piston | RN923 | 14 {140} / 21 {210} w/ PWL bearing | 1 | −25 to 100 |
| HSD | Piston (double-acting) | RN906 | 14 {140} / 21 {210} w/ back-up | 1 | −10 to 80 |
| PS (Penta) | Rod | RN906 (RF905) | 14 {140} / 21 {210} w/ back-up | 0.5 | −10 to 80 (−5 to 150) |
| NMY | Rod (small bore) | RN906 | 14 {140} / 21 {210} w/ back-up | 0.5 | −10 to 80 |
| OSY | Piston (low pressure / air-hydro) | RN801 | 5 {50} | 1 | −10 to 80 |
| ST | Piston (PTFE + O-ring) | PT111 | 25 {250} | 3 | −30 to 100 |
| STS | Piston (low-pressure PTFE) | PT111 | 10 {100} | 1 | −30 to 100 |
| STG | Piston (heavy machinery) | PT111 | 28 {280} | 3 | −30 to 100 |
| SMJ | Rod (high-density PTFE) | PT154 | 21 {210} / 35 {350} | 3 | −30 to 100 |
| STR | Piston (rotary / oscillating) | PT151 | 28 {280} | 0.3 | −30 to 100 |
Pneumatic packings
Low-friction lip seals and JIS B 2401-P groove-compatible U-cups for pneumatic cylinders. GLY is a non-lube (dry air) profile; MYA/MYN/MYH and MYP/MYR cover small bores that share O-ring grooves.
| Profile | Use | Material | Max pressure MPa {kgf/cm²} | Max speed (m/s) | Temp. (°C) |
|---|---|---|---|---|---|
| PGY | Piston | RN713 (RF905) | 1 {10} | 1 | −15 to 60 (−5 to 150) |
| PNY | Rod | RN713 (RF905) | 1 {10} | 1 | −15 to 60 (−5 to 150) |
| GLY | Piston & rod (non-lube) | RK701 (RF905) | 1 {10} | 1 | −25 to 70 (−5 to 150) |
| PPD | Piston (double-acting) | RN729 | 1 {10} | 1 | −20 to 80 |
| PSD | Piston (double-acting, compact) | RN713 (RF704) | 1 {10} | 1 | −15 to 60 (−5 to 150) |
| PDU | Rod (with integral dust lip) | RN818 (RF905) | 1 {10} | 1 | −15 to 60 (−5 to 150) |
| MYA / MYN / MYH | Piston & rod (mini) | RK703 / RN716 / RF704 | 0.8 {8} | 0.4 | −25 to 70 / −10 to 70 / −5 to 150 |
| MYP | Piston (JIS B2401-P groove) | RN722 | 1 {10} | 0.5 | −20 to 60 |
| MYR | Rod (JIS B2401-P groove) | RN818 | 1 {10} | 0.5 | −15 to 60 |
| PPY | Piston (small bore) | RN713 (RF704) | 1 {10} | 1 | −15 to 60 (−5 to 150) |
| PRY | Rod (small bore) | RN713 (RF704) | 1 {10} | 1 | −15 to 60 (−5 to 150) |
| Amime gasket | Flat / grid-face gasket | RN917 / RD914 | 1 {10} | — | −30 to 80 |
| RY | Piston & rod (large bore ≥ ø250) | RN906 | 1 {10} | 1 | −10 to 70 |
| AL | Piston (L-type, ≥ ø150) | RD902 / RD903 | 1 {10} | 1 | −10 to 70 |
Dust seals / wipers
Rod wipers protecting the primary rod seal from ingress. Snap-in elastomer, metal-cased press-fit, fibre-composite and low-friction pneumatic variants.
| Profile | Use | Material | Max speed (m/s) | Temp. (°C) |
|---|---|---|---|---|
| SDR | Rod — snap-in | RN906 (RF905) | 1 (0.5) | −25 to 100 (−5 to 150) |
| SCK | Rod — large section, indoor/outdoor | RN814 | 1 | −45 to 100 |
| SCB | Rod — metal-cased, press-fit | RN807 | 1 | −40 to 100 |
| SER | Rod — snap-in, small bore | RN906 (RF905) | 0.5 | −25 to 100 (−5 to 150) |
| BIHO / BIHI (Soft wiper) | Piston & rod — fibre wiper | BF001 | 1 | −30 to 80 |
| SFR | Rod — low friction, pneumatic | RN912 | 1 | −30 to 100 |
| SDB | Rod — metal-cased, coolant/cutting oil | RN819 (RF903) | 1 | −25 to 100 (−5 to 150) |
Wear rings and back-up bearings
Fabric-reinforced phenolic bearings that prevent metal-to-metal contact, reduce side load on the sealing element and extend service life.
| Profile | Use | Material | Pressure MPa {kgf/cm²} | Max speed (m/s) | Temp. (°C) |
|---|---|---|---|---|---|
| SW (wear ring) | Piston — hydraulic | PB201 | — | 3 | −55 to 120 |
| SWA (wear ring) | Piston — low-pressure / pneumatic | PB201 | — | 3 | −55 to 120 |
| SWB (wear ring) | Piston — pneumatic | PB251 | — | 3 | −55 to 120 |
| PWL bearing | Piston — back-up + bearing (for RGU) | PN104 | 21 {210} | 1 | −25 to 80 |
| WPB sleeve | Piston — back-up + bearing (SKY groove) | PN104 | 21 {210} | 1 | −25 to 80 |
| WRB sleeve | Rod — back-up + bearing | PN104 | 21 {210} | 1 | −25 to 80 |
Other
Stroke-end cushion seals, back-up rings and metal coil scrapers used alongside the primary sealing elements.
| Profile | Use | Material | Pressure MPa {kgf/cm²} | Max speed (m/s) | Temp. (°C) |
|---|---|---|---|---|---|
| PCS (cushion seal) | Piston — pneumatic stroke-end cushion | RN803 (RF903) | 1 {10} | 0.5 | −5 to 80 (−5 to 150) |
| PG ring (PGRO / PGRI) | Piston / rod — shock back-up | PT111 | 21 {210} | 1 | −55 to 80 |
| MDH | Rod — coil-type metal scraper | JIS H3270 C5191W [PBW2] | — | — | ≤100 (ø<70), ≤80 (ø70–100) |
Notes
Values reproduced from the Sakagami Seisakusho 2024 catalogue. For dimension tables, groove design and extrusion limits, download the individual profile PDF from the Sakagami catalogue page. Sealparts is the official UK distributor — contact our technical team for cross-referencing, material substitution or bespoke specification.
Frequently asked questions
- How many seal profiles does Sakagami manufacture?
- The 2024 Sakagami catalogue lists 18 hydraulic packings, 14 pneumatic packings, 7 dust seals / wipers, 6 wear rings and back-up bearings, plus cushion seals and metal scrapers — around 48 distinct profile families.
- Which Sakagami profiles share the JIS B 2401 O-ring groove?
- NMY (rod, hydraulic), PS Penta seal (rod, hydraulic), MYA / MYN / MYH (piston & rod, pneumatic), MYP (piston, pneumatic) and MYR (rod, pneumatic) are all designed to drop into standard JIS B 2401-P series O-ring grooves.
- What is the highest pressure Sakagami elastomer profile?
- KY reaches 35 MPa (350 kgf/cm²) with a standard + high-pressure back-up ring combination. GPY and GNY reach the same 35 MPa rating in the equivalent stacked configuration.
Standards
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