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Brand: Posi Lock
Posi Lock TK-107 4-in-1 Internal and External Puller Set
Description
The Posi Lock TK-107 is a four-in-one internal and external puller set built around a redesigned 5-ton Model 107 puller. By removing the pins and giving the jaw head a one-third turn, the same Safety Cage that pulls bearings off a shaft is converted to pull from the inside of a bore.
Four pulling jobs in one hard-shell case
Maintenance crews often face both kinds of pull in a single job: a bearing or gear on a shaft, then a bushing, seal or race inside a housing. The TK-107 gives them one patented steel Safety Cage that houses both internal and external jaws, so the set replaces several separate tools.
For internal pulls the set adds internal jaws, a slide rod and a 2.5 lb slide hammer, plus an internal puller long-jaw set, all stored with the puller in a single case.
Technical specifications
| Parameter | Specification |
|---|---|
| Model | TK-107 puller set (4-in-1) |
| Main puller | Model 107 (5-ton class per the maker’s page) |
| Jaw sets | External jaws on the puller; internal puller jaws 10554; internal long jaw set 10554L (qty 3) |
| Slide hammer | 2.5 lb (1.13 kg), with slide rod 10561 |
| Tip protector | P4 |
| Case | Hard-shell case |
| Case size | 34 x 8.5 x 4.5 in. (864 x 216 x 114 mm) |
| Set weight | 15.8 lb (7.2 kg) |
| Related sets listed by the maker | Slide hammer puller sets PM16 and TB-1045; mini manual puller set PMW-1 |
What is in the case and how it is used
The maker lists the contents as one Model 107 puller, one P4 tip protector, one 10561 slide rod, one 10554 internal puller jaw set, one 2.5 lb slide hammer, three pieces of the 10554L long-jaw set and the case. The tip protector sits on the center bolt to protect the shaft end during external pulls.
The external pull follows the standard Posi Lock procedure from the instruction sheet: set the jaws behind the component, seat the cage, centre the bolt and turn it with a wrench until the part moves. The internal pull uses the slide rod and hammer to jar the part out of the bore. Inspect the jaws and thread before each use, wear eye protection and replace damaged parts.
Choosing between the TK-107 and related sets
At 15.8 lb (7.2 kg) and 34 inches long the case is built for a toolbox, and it is a different proposition from the hydraulic pullers in the same range. If your shafts are large or the press fit is heavy, a hydraulic model such as the PHA-108 or PHA-113 is more suitable. The maker’s TB-1045 set combines a Model 104 and a Model 105 puller, and the PM16 and PMW-1 sets are also shown as related.
Documents and quotation
The linked PDF is the maker’s one-page TK-107 specification sheet. Before ordering, confirm the capacity needed for the pulls you expect, the bore and shaft sizes, and which jaw sets you want in the case. The maker’s page describes the puller as a 5-ton model but gives no tonnage for the internal set, so we do not state one. Send us the model code, quantity and delivery location and we will prepare a quotation; Seven Star LLC supplies from Muscat as an independent supplier. Browse related maintenance tools in our Electric Motors category.
Datasheets & Documents
- Datasheet Posi Lock TK-107 puller set specification sheet (PDF) Download
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About brand
Posi Lock Puller is an American maker of gear and bearing pullers, based in Cooperstown, North Dakota. Its founder Dean Somerville, who ran a machinery repair shop and farm in McHenry, North Dakota, designed a self-aligning puller with a Safety Cage around the jaws in 1974, and the caged puller was patented in 1977. The company has been in operation since 1978 and is led by Tamara Somerville.
Seven Star LLC is an independent supplier in Muscat. We list Posi Lock pullers and tool sets for maintenance workshops in Oman and the GCC.
Posi Lock company profile
| Founded | 1978, North Dakota, by Dean Somerville |
|---|---|
| Headquarters | Cooperstown, North Dakota |
| Key invention | Safety Cage puller, designed 1974, patented 1977 |
| Leadership | Tamara Somerville |
| Product families | Manual 2-jaw and 3-jaw pullers (1 to 40 tons), hydraulic pullers (5 to 200 tons), self-contained hydraulic pullers, internal/external pullers |
Milestones
- 1974: Dean Somerville designs the Safety Cage puller.
- 1977: The caged puller is patented.
- 1978: The company begins operating.
Posi Lock product series
Hydraulic pullers include the PHA-108 10 ton, PHA-113 25 ton and PHA-116 50 ton three-jaw pullers, the PHA-113IE 25 ton internal and external puller, the PHS-208 two-jaw self-contained puller and the PH-100T 100 ton three-jaw puller.
Manual tools include the 108 17 ton three-jaw gear and bearing puller and the TK-107 4-in-1 internal and external puller set. The AT-1108 Side Align is a horizontal alignment tool set for moving motors and pumps during shaft alignment.
Hydraulic pullers are chosen by the force needed and the reach and spread of the jaws; the self-contained PHS and PHA models have their own pump, and the larger PH-100T is used for heavy couplings and large bearings. The safety cage keeps the jaws from slipping off the part under load, which reduces the risk of injury when pulling seized components.
Where Posi Lock pullers are used
Removing bearings, gears, pulleys, couplings and sleeves from motor, pump, gearbox and fan shafts in plant maintenance and repair shops.
Posi Lock products we list
Ordering Posi Lock tools: what we need
Send the model, or the part diameter, reach and required force, and whether hydraulic or manual operation is preferred.
Facts checked against Posi Lock's own company releases and trade press profiles, October 2026.
Browse Posi Lock products by category: Lubrication & Bearing Maintenance.
Related products
Frequently Asked Questions
A Model 107 puller, P4 tip protector, slide rod 10561, internal puller jaws 10554, a 2.5 lb slide hammer, three 10554L long jaws and a case.
By removing the pins and giving the jaw head a one-third turn, as described on the maker's page.
15.8 lb (7.2 kg) in a case of 34 x 8.5 x 4.5 in.
The maker's page describes a 5-ton puller; no tonnage is given for the internal pull.
The maker lists slide hammer puller sets PM16 and TB-1045 and mini set PMW-1.


















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