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Product · Shaft connection & protection

Locking Assemblies

Shrink sleeves, shrink discs and compression locking devices — zero-backlash, keyless shaft–hub connections.

Standard GB- and DIN-pattern locking assemblies in common sizes are kept in stock and ship same-week. Non-standard sizes, taper angles and outer profiles are machined from solid bar to your drawing — typical lead time 15–25 days.

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Wolfer keyless locking device · shrink sleeve, shrink disc · GB / DIN standard, in stock · made in Foshan China

Selection · Datasheets

Models & Datasheets

Download keyless locking-assembly datasheets by model (R series, keyless interference connection, GB / DIN compatible). See each PDF for rated torque, dimensions and installation.

R01 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R02 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R03 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R04 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R05 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R06 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R07 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R12 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R13 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R14 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R15 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R17 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R18 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R19 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R21 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R22 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R33 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R37 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

R39 Keyless Locking Device

Keyless locking assembly — tightening the screws generates radial clamping to lock shaft and hub; self-centering and reusable. Rated torque and dimensions in the datasheet.

Datasheet PDF →

Standards
GB 10071 · DIN 7190 · compatible WK / TLK / RfN patterns
Bore range
Ø 6 – Ø 200 mm
Backlash
Zero · full bidirectional torque
Stock
Standard GB / DIN sizes on hand

What we make

Four locking-assembly families.

Type 1

Shrink sleeves

Inner + outer ring with axial screws; expands radially to grip both shaft and hub. Zero backlash on torque reversal. Most common keyless option.

Type 2

Shrink discs

External clamping ring for hollow-shaft / gearbox-output connections. No shaft modification — common on extruders, mixers, large drives.

Type 3

Compression locking devices

Multi-ring stacks for high torque density in a short axial envelope. RfN / KLBB-pattern compatible.

Type 4

Custom variants

Non-standard bore, outer profile or bolt pattern — machined from solid bar to drawing. 15–25 day lead time.

Stock

In-stock sizes

Common GB & DIN bore sizes (Ø 10 / 15 / 19 / 20 / 24 / 25 / 28 / 30 / 35 / 38 / 40 / 42 / 45 / 48 / 50 / 55 / 60 / 70 / 80 / 90 / 100 mm) ship the same week from Foshan.

A locking assembly eliminates the keyway entirely — turning the shaft / hub interface into a press-fit connection that handles bidirectional torque without backlash. It also lets you reposition or remove the hub in minutes (release the screws, slide the hub).

Most internationally known patterns — WK, TLK, KTR, RfN, KLBB — share a small set of dimensional standards we cut to. We do not stock OEM-branded parts, but our manufactured-to-pattern variants are interchangeable in the equivalent installation. For quick-mountTaper Bushings, see the dedicated product line.

Why keyless

Four reasons to skip the key.

01

Zero backlash

Press-fit contact across the full bore — no clearance for torque reversal to take up.

02

No stress concentration

Removes the keyway — eliminates a notch that initiates fatigue cracks under cyclic torque.

03

Repositionable

Release the screws, slide the hub to a new location, retighten — no machining needed.

04

Reusable

Survives many install / dismount cycles without losing torque capacity, unlike interference press-fits.

Standards & testing

What we cut to, and what we verify.

GB 10071-1988 — Chinese national standard for keyless locking assemblies
DIN 7190 — German interference-fit calculation reference
Compatible dimensional patterns — WK / TLK / KTR / RfN / KLBB
Material: 42CrMo4 / 1.7225 through-hardened (alternatives on drawing)

Static torque test on every batch
Bolt torque-to-yield certification on the supplied bolt set
Hardness verification per lot (HRC, surface)
EN 10204 3.1 mill certificate shipped with every part lot

Where they go

Applications by industry.

Robotics

Joint reducer output → arm link, zero-backlash mount

Laser Equipment

Gantry pinion to drive shaft, no keyway under cyclic reversal

Machine tools

Spindle to belt pulley; index-table drive to gearbox output

Industrial Automation

Conveyor head shafts to gearmotor output

Packaging

Cam shafts on filling / capping lines, fast re-position

Heavy industry

Extruder, mixer, large drive hollow-shaft connections (shrink discs)

“Their locking assemblies and couplings have performed outstandingly under the heavy shock loads of our ceramic presses — three years, zero failures — and after-sales response is always prompt.”

Equipment Manager Building-materials machinery company 3 years · zero failures

FAQ

Common engineering questions.

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When should I use a locking assembly instead of a keyed joint?

Whenever backlash matters. Locking assemblies eliminate keyway clearance entirely and survive torque reversal without fretting. They also disassemble and reposition — useful in adjustable drives and high-uptime lines. A keyed joint is cheaper to make but trades these benefits for simplicity, and is fine for low-precision, mostly-unidirectional applications.

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Do you stock OEM-branded parts (KTR, Ringfeder, etc.)?

No. We manufacture to the dimensional patterns those brands use — same bore, same taper, same bolt circle — so our parts are interchangeable in equivalent installations. We ship our own Wolfer-marked parts with EN 10204 3.1 material certificates. If you need genuine branded parts under a global supplier agreement, those should be sourced from the brand directly.

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What's the typical lead time?

Standard GB / DIN sizes in stock ship same week from Foshan. Custom variants (non-standard bore, taper, or outer profile) are machined from solid bar in 15–25 days from drawing confirmation.

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What torque can a locking assembly transmit?

Depends on bore size, type, and bolt class. A typical Ø 50 mm shrink sleeve transmits ~3,000 Nm; a Ø 100 mm shrink disc can transmit ~30,000 Nm. Send us your duty cycle (torque, reversal frequency, shock factor) and we'll size the right pattern.

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How do I install it correctly?

Clean the shaft and hub bore (no oil, no grit). Tighten the bolts in a diagonal sequence, multiple passes, never single-pass to full torque. Each part lot ships with the printed installation guide. We also have an installation video — ask sales.

Related products

Parts often ordered together.

Taper Bushings

Taper-Lock · QD · quick-mount

View →

Couplings

Jaw · beam · diaphragm · disc · bellows · Oldham

View →

Gear Shafts

One-Piece Gear Shafts

View →

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