A split taper bushing uses a longitudinal slot plus jacking screws to back out of the hub without permanently deforming the shaft, whereas a taper-lock bushing requires the operator to loosen cap screws and pull the bushing forward out of the mating tapered hub [S3][S4].
Removal behaviour, not installation grip, is the decisive difference for maintenance planners, because a stuck taper-lock on a 1008 series bushing is tightened to roughly 4.6 lb-ft (55 lb-in) of bolt torque while a 5040 series reaches 258.3 lb-ft (3100 lb-in) per bolt [S4].
Construction Differences That Drive the Removal Method
Split taper bushings use a full longitudinal split plus an 8° outer cone, allowing the body to flex radially as cap screws are torqued; this flex is the same feature that lets a technician re-open the slot during removal [S3]. Taper-lock bushings, by contrast, are a single-piece sleeve that gradually tapers along the through-bore, so they cannot flex open and must be walked out of the hub by pushing on dedicated removal (half-threaded) holes [S2][S4].
The split-taper slot is what keeps the shaft clean: because the bushing expands radially instead of wedging axially, the shaft surface is not grooved or marked by repeated installation cycles [S3]. Taper-lock designs trade that property for a tighter concentric grip, since the bushing-to-hub taper engages over a longer axial length rather than a short radial land [S2].
Removal Procedure: Split Taper Bushing
For a split taper bushing, the operator loosens the cap screws evenly, then drives the jacking screws (when fitted) into the designated clearance holes to lift the bushing off the shaft; the split closes slightly as the bushing releases, so it slides off without forcing the shaft through a tight bore [S3]. This sequence is why split-taper parts are commonly chosen for conveyor drives and agricultural equipment where field removal without specialty pullers is required [S3].
Because the slot is the working feature, the bushing can be re-installed after a simple visual inspection; no press or hydraulic puller is needed for sizes typically ranging from 1008 through 5050 [S3]. The trade-off is that the split limits how much radial clamping force the bushing can sustain compared with a solid sleeve, which is why cast iron and steel are both specified as body materials depending on torque class [S3].
Removal Procedure: Taper-Lock Bushing
For taper-lock designs, the published procedure is to remove the bushing bolts, lightly oil them, and re-thread them into the half-threaded removal holes on the bushing side; as those bolts are tightened, they force the bushing out of the hub while the hub stays on the shaft [S4]. Bolt torque values follow the published table, with two bolts at 4.6 lb-ft (55 lb-in) for the 1008 and 1108 series, rising to seven bolts at 651.7 lb-ft (7820 lb-in) for the 6050 and 7060 series [S4].
The procedure also explicitly bans lubricants on the taper surfaces and bore during installation, because oil film reduces friction and can fracture the hub under torque; the same warning applies to the reverse process, meaning a stuck taper-lock cannot be coaxed out with penetrating oil without risking hub damage [S4]. For vertical shafts, the manual requires positive retention of the sheave and bushing during removal to prevent a drop hazard [S4].
Side-by-Side Decision Matrix
On four decision criteria drawn from the research, the comparison lines up as follows. (1) Removal tooling: split-taper needs only hand tools and jacking screws; taper-lock needs the same wrench set plus the correct half-threaded bolt pattern, and may need a brass drift to break the taper seat [S3][S4]. (2) Shaft condition after removal: split-taper leaves the shaft unmarked; taper-lock can leave a faint line at the bore-to-shaft contact zone if the bushing was over-inserted [S3][S4]. (3) Hub compatibility: split-taper matches hubs bored to the STB (American standard) 8° pattern; taper-lock uses Reliance Electric's Taper-Lock pattern, with QD from Emerson Electric as a third competing system [S1][S4]. (4) Re-usability: split-taper can be re-installed several times provided the cap-screw threads are intact; taper-lock can be re-used if the bore is not deformed, but the manual instructs operators to re-torque after drive run-in, signalling that vibration can re-seat the bushing and complicate later removal [S3][S4].
Use a split-taper bushing when the drive is in a service location with limited tooling, when the shaft is precision-ground and cannot be marked, or when components are swapped frequently. Use a taper-lock bushing when the application runs at high torque, the hub already has a Taper-Lock pattern, and removal is planned only during scheduled overhauls [S1][S3][S4].
Standards, Lubrication, and Common Failure Modes
The bore keyway on split-taper bushings is machined to ISO keyway standards, which keeps the bushing interchangeable across suppliers that follow the American 8° STB pattern [S3]. Taper-lock is a proprietary Reliance Electric pattern (QD being Emerson's competing system), so cross-brand compatibility is limited to within each family [S1][S4].
The most common removal failure on a taper-lock is hub fracture caused by lubricant on the taper, by worn hex keys rounding off the bolt heads during re-torque, or by over-inserting the bushing past its seated position [S4]. The most common removal failure on a split-taper is a stripped jacking-screw thread when an operator tries to lift a bushing that has corroded to the shaft, especially in outdoor or wash-down environments where moisture penetrates the slot [S3]. Specifying a steel bushing rather than cast iron raises the cost but reduces both the corrosion risk and the jacking-screw thread-strip risk in heavy-torque service [S3].
Sourcing and Specification Notes
Engineers writing a specification should call out the bushing system by name (STB split-taper or Taper-Lock), the series number (e.g. 1610, 2517, 3020), the bolt count, the required torque value from the OEM table, and the hub pattern; matching the wrong pattern to the hub is the single most common field failure that turns a planned 30-minute removal into a shaft pull [S1][S4]. For a wider primer on how these bushings fit into the broader power-transmission stack, the taper bush encyclopedia entry collects the geometry and material options in one place.
Two trackable signals to watch on the supplier side: (a) more STB datasheets are listing matched jacking-screw thread sizes, which removes a guesswork step during removal; (b) taper-lock suppliers continue to publish updated torque tables aligned to the 1008-7060 series range, with the 6050/7060 holding at 651.7 lb-ft (7820 lb-in) per bolt as of the current technical bulletin [S4]. For related mechanical-design context, see the write-up on bearing race layer geometry, which covers how tapered sleeve features interact with adjacent race geometry in plain-bearing arrangements.
The underlying component specifications are covered under lock nut, and pressure transmitter.
