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.
Last updated Reviewed by Luo Genwen, Production Plant Manager
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.
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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 →
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.”
FAQ
Common engineering questions.
+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.
+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.
+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.
+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.
+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.
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