Step Seals

PTFE slipper for stick-slip-free motion

A PTFE slipper-seal energised by an elastomer O-ring, delivering ultra-low-friction, stick-slip-free rod and piston sealing.

PTFE face gives ultra-low friction and zero stick-slip
Elastomer O-ring energiser supplies constant load
Smooth, precise actuation for servo and test rigs
Excellent chemical resistance and wide temperature range
Long life under high-cycle and high-pressure duty

Temperature: -30°C to +200°C
Pressure: Up to 400 bar (with back-up)
pH range: 0 – 14

PTFE step seal with its elastomer O-ring energiser — Hydraulic SealsREF · step-seal

Technical DatasheetSPEC

The numbers, on the record

Every figure below is the specification we hold ourselves to — material, service envelope, media compatibility and conformance. Download it as a standalone document for your dossier.

SealGuard

Technical Datasheet

Doc No.: DS-STEP-SEAL
Revision: Rev. A
Issue: 2026-Q3
Class: Hydraulic Seals

Step Seals

PTFE slipper for stick-slip-free motion

01

Material & Construction

Filled-PTFE slipper seal energised by an NBR / FKM / EPDM O-ring

02

Service Envelope

Temperature range	-30°C to +200°C
Pressure rating	Up to 400 bar (with back-up)
pH range	0 – 14

03

Media Compatibility

Hydraulic oilsWater & emulsionsSolventsMany chemicals

04

Dimensions & Sizing

Rod Ø8–500 mm · bore Ø16–600 mm · metric & inch · ISO 7425

05

Standards & Conformance

ISO 7425-1
ISO 7425-2

06

Certifications

ISO 9001
RoHS / REACH

07

Additional Specifications

Sealing element	Bronze / glass / carbon-filled PTFE
Friction	Very low, stick-slip free

Energiser	NBR / FKM / EPDM O-ring
Max speed	Up to 15 m/s

Specify & QuoteORDER

Build your line item

Choose the material grade and size that match your duty, set a quantity, and add a fully-specified line to your quote. No prices, no obligation — our engineers confirm specification and lead time on every enquiry.

01

Material grades

Bronze-filled PTFE / NBR energiser
Glass-filled PTFE / FKM energiser
Carbon-filled PTFE / NBR energiser
Virgin PTFE / EPDM energiser
Modified PTFE (high wear) / FKM

02

Sizes & configurations

Rod Ø8–500 mm
Bore Ø16–600 mm
Rod or piston (single-acting) profile
Metric (ISO 7425) sizes
Inch (cylinder) sizes
Custom sizes to drawing

In ServiceUSE

Where it holds the line

The step seal — or slipper seal — pairs a hard PTFE sealing element with an elastomer O-ring energiser to combine the best of both: the O-ring supplies constant radial load while the PTFE face does the sealing with almost no friction and zero stick-slip. The result is glass-smooth actuation, precise position control and immunity to the start-up judder that mars elastomer-only seals. With excellent chemical resistance and a wide temperature range, it is the premium choice for servo, test-rig and high-cycle hydraulic duty.

Typical applications

01Servo-hydraulic and test-rig actuators
02High-cycle industrial cylinders
03Precision positioning systems
04Injection-moulding and press hydraulics
05High-pressure rod and piston sealing

Industries served

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Let’s specify it

Specify this seal for your service.

Send us the media, temperature, pressure and motion for your duty and our engineers will confirm the right material grade, size and standard for your application.

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