Technical Foundation
What Is a Slide Hammer?
A slide hammer consists of a steel shaft with a sliding weight that rides along it, stopped at one end by a fixed collar; the operator threads or hooks an attachment onto the working end, engages it with the part to be removed, and repeatedly slides the weight down the shaft to strike the stop collar, transmitting a sharp outward impact force to pull the part free. Because the force is delivered as a series of impacts rather than continuous tension, slide hammers can free stuck or corroded parts (bearings, races, hub studs, dents) that resist steady pulling with a screw-type puller.
Attachment selection determines the application: threaded adapters mate to the puller's shaft and thread into a stud or a slide-hammer-compatible puller jaw for bearing and race removal; internal (blind hole) bearing pullers use expanding jaws or a collet that grips inside a bore where there's no accessible outer edge to pull against; and dent-puller attachments use a self-tapping screw or a suction cup to grip sheet metal for body repair work. Hammer weight (commonly 2-10 lb) should be matched to the resistance expected — heavier weights deliver more force per stroke but require more clearance and operator effort to swing effectively.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Hammer Weight | 2 lb to 10+ lb sliding weight | Heavier weights deliver more impact force per stroke but need more swing clearance |
| Shaft Diameter/Thread | Common threads: 3/8-16, 5/16-18, M10 | Must match the attachment's mounting thread — not universal across brands |
| Attachment Type | External puller jaws, internal (blind hole) puller, dent hook, stud adapter | Determines what geometry of part the tool can grip |
| Reach/Access Clearance | Overall length with attachment installed | Must clear surrounding housing or structure to swing the weight effectively |
| Internal Puller Expansion Range | Jaw or collet expansion range, in. | Sets the bore diameter range a blind-hole bearing puller can grip |
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Applications
Where Slide Hammers Get Used
Slide hammers are specified wherever a pressed, seized or corroded part needs to be pulled with a sharp impact force rather than steady tension.
Automotive Repair
Slide hammer bearing and race pullers removing wheel bearings, hub assemblies and pressed components without a press.
Auto Body Repair
Dent puller attachments used to draw out sheet metal dents in collision repair without cutting into the panel.
Industrial Equipment Maintenance
Internal bearing pullers removing blind-bore bearings and bushings from gearboxes and housings in the field.
Small Engine & Equipment Repair
Stud extractor attachments removing broken or seized studs without drilling.
Machine Shop & Fabrication
General-purpose slide hammers for freeing stuck pins, dowels and pressed components during disassembly.
FAQ
Slide Hammers Questions, Answered
What's the difference between an external and an internal bearing puller attachment?
An external puller uses jaws that grip the outer edge or face of a bearing or race from outside, pulling it off a shaft — used where the part has an accessible outer edge. An internal (blind-hole) puller has expanding jaws or a collet that's inserted into the bore of a bearing or bushing and expanded to grip from the inside, used when there's no accessible outer edge because the part is recessed in a housing.
How heavy a slide hammer do I need?
Lighter weights (2-3 lb) are usually enough for smaller bearings, light dent work, and general disassembly; heavier weights (5-10 lb) deliver more force per stroke for stubborn, corroded, or larger pressed parts, but require more swing clearance and physical effort. Match the weight to the resistance you expect, and confirm you have room to swing it fully in the actual working space.
Can a slide hammer damage the part I'm trying to remove or reuse?
It can, if the attachment isn't matched correctly to the part or if excessive force is used on a part that's more seized than expected — this is more of a risk with dent pullers on thin sheet metal and with bearing pullers on parts intended for reuse. For parts being reused, apply steady, moderate strokes and stop if the part isn't moving to avoid distorting it or the surrounding housing.
Are slide hammer attachments interchangeable between brands?
Not always — attachment mounting threads vary between manufacturers (common sizes include 3/8-16, 5/16-18, and metric equivalents), so an attachment bought separately needs to match the slide hammer shaft's specific thread. Buying a kit with matched shaft and attachments avoids this compatibility issue.
What attachment do I need to pull a broken stud?
A stud extractor attachment for a slide hammer typically uses a self-locking collet or gripping jaws that clamp around the exposed portion of the broken stud, letting the slide hammer's impact pull it straight out without drilling — useful when the stud is broken flush or slightly proud of the surface and there's enough exposed length to grip.
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