Sakagami Seisakusho Ltd. is a long-established Japanese manufacturer of hydraulic and pneumatic packings, scrapers, wear rings and bearings. This catalogue is the complete product reference — covering every profile, the rubber and resin compounds used, and full groove and dimension tables.
The product codes shown here (GPY, GNY, RGY, RNY, SKY, KY, STK, MY, PG, SDR and so on) are the original Sakagami designations. Standard groove dimensions follow JIS practice and are dimensionally interchangeable with most major Japanese cylinder builders.
Hydraulic packings — piston
- GPY — piston seal, NBR (RN919), to 35 MPa with back-up rings
- RGY — piston seal, urethane (RN923), to 28 MPa
- ⓉSGY — piston seal, low-temperature NBR (RN812), to 21 MPa, −45 °C
- SKY — piston/rod combination, urethane (RN906), to 28 MPa
- KY — piston/rod combination, urethane (RN906), to 35 MPa
- RGU — piston seal with built-in wear function, to 21 MPa
- HSD — heavy-duty piston seal, to 21 MPa
- OSY — low-pressure piston seal for air-hydro service, to 5 MPa
- ST / STS / STG — PTFE-faced piston seals (PT111) with elastomer energiser, to 28 MPa, up to 3 m/s
- STR — PTFE piston seal for rotary and oscillating service (PT151)
Hydraulic packings — rod
- GNY — rod seal, NBR (RN919), to 35 MPa with back-up rings
- RNY — rod seal, urethane (RN922), to 28 MPa
- ⓉSNY — rod seal, low-temperature NBR (RN809), to 21 MPa, −45 °C
- NMY — compact rod seal, urethane (RN906), to 21 MPa
- PS Pentaseal — five-lip rod packing set (RN906 / RF905), to 21 MPa
- SMJ — PTFE rod seal (PT154) for high-pressure service, to 35 MPa, up to 3 m/s
Pneumatic packings
- PGY — piston-only NBR packing
- PNY — rod-only NBR packing
- GLY — combination piston/rod packing
- PDU / PPD / PSD — purpose-built pneumatic profiles for short-stroke and compact cylinders
- MY (MYA/MYN/MYH) — double-acting piston seal, the standard pneumatic profile
- MYP / MYR — variant MY series for specific groove geometries
- PPY / PRY — low-friction pneumatic profiles
- AG4 — woven gasket (Amimegasket) for valve and end-cap sealing
Scrapers and wipers
- SDR — single-acting rubber scraper, the standard wiper
- SCK / SCB — metal-cased scrapers for retained installation
- SER — heavy-duty scraper for contaminated environments
- SFR — snap-in scraper with integrated retaining flange
- SDB — double-edged scraper (dust + secondary seal)
- BIHO / BIHI — soft-lip wipers for low-friction service
- MDH — coil-sprung scraper for ice / debris ingress
Wear rings, bearings and back-up
- SW / SWA / SWB — phenolic-resin wear rings (piston and rod, multiple cross-sections)
- WPB / WRB — bearing sleeves for piston and rod guidance
- PWL — PTFE-composite bearing strip
- PCS — cushion seal for end-of-stroke deceleration
- PG-PGRO / PG-PGRI — split PG back-up rings for piston and rod grooves
Materials
Sakagami compounds are coded by family: RN-series are nitrile and urethane elastomers (RN801, RN809, RN812, RN906, RN919, RN922, RN923), RF-series (RF905, RF907) are heat-resistant variants used for the SKY-300F / KY-250F and above, and PT-series (PT111, PT151, PT154) are filled PTFEs used for the ST, STK and SMJ ranges. Water-glycol and HFC fluids reduce service life — for sustained operation above 70 °C in water-based fluids please contact us before specifying.
Operating range
- Pressure: up to 35 MPa (350 bar) with combined standard + high-pressure back-up rings
- Speed: up to 3 m/s for PTFE-faced ST and SMJ profiles; 1 m/s for elastomer profiles
- Temperature: −45 °C (ⓉSGY/ⓉSNY low-temp NBR) up to +150 °C (RF907 heat-resistant)
- Standard grooves follow JIS B 2406 practice; non-standard sizes available on enquiry
UK supply
SEALPARTS is the UK contact for Sakagami packings, scrapers and wear rings. Send drawings, part numbers or samples for a quotation — quotes are typically returned within 1–3 working days.