Spanners
The spanners described here are dedicated tools for tightening and removing locknuts (round nuts with grooves on the outer circumference) that fix rolling bearings to shafts or adapter sleeves. The typical type is the hook type, which engages the groove on the nut's outer circumference. Other types include the pin type, which fits into holes on the nut face, the adjustable type, which covers multiple sizes with one tool, and the impact type, which is struck with a hammer for large nuts. For mounting bearings on tapered seats, some sets include a protractor to control the tightening angle and secure the required push-in amount. They are used in equipment maintenance and in bearing replacement and assembly work.
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Spanners
Impact Spanner
Impact spanner for large locknuts, used to tighten and loosen them by applying effective impact. Used in combination with a hammer.
SKF
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Spanners
Lock Nut Spanner TMHN 7
Model: TMHN 7
A lock nut spanner set for mounting on tapered seats of self-aligning ball bearings and similar bearings. Prevents overtightening.
SKF
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Spanners
Hook Spanner HN Series
Hook spanner for tightening and removing bearing lock nuts. Available in many sizes from HN 0 to HN 21-22.
SKF
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Spanners
Universal Hook Spanner HNA Series
Universal hook spanner that fits several nut sizes with a single unit. A set of four covers a wide range of nuts.
SKF
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Spanners
SKF Housing Hook Spanner
Dedicated hook spanner for tightening and loosening lock nuts on SKF bearing housings. Wide contact surface provides secure grip.
SKF
How to choose Spanners
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1. Match the locknut number
Hook spanners are supplied for each corresponding locknut number, such as HN 4 or HN 5, so the number determines compatibility. If the claw and nut groove dimensions do not match, the tool slips and can damage the nut or groove, so confirm that the locknut number to be used falls within the compatible range.
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2. Check the outer diameter range
The outer diameter range of locknuts that a spanner can engage is set for each product, and listed products cover 16 to 210 mm. Adjustable types cover multiple outer diameters with one tool, but the range is limited, so check that all the nut outer diameters you have fall within it.
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3. Select the spanner type for the task
For reliably gripping a specific size, the hook type is suitable; where sizes are mixed on site, the adjustable type is suitable; and where manual force is insufficient for large nuts, the impact type used with a hammer is suitable. If the nut has holes in its face, the pin type is required. Decide the type based on the nut shape and the work content.
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4. Check large units against outer diameter d and dimensions
For large locknuts, the catalogue may indicate compatibility by the applicable outer diameter d, and listed products cover 148 to 746 mm. Surrounding space and the swing radius are also relevant, so check together with overall length L whether the tool fits in the work area.
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5. Control angle for tapered seat mounting
When mounting self-aligning ball bearings and similar units on tapered shafts or adapter sleeves, controlling the push-in amount by tightening angle prevents over- or under-tightening. Sets with a protractor are intended for this application, and for sets supplied with a carrying case, also confirm the storage dimensions.
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6. Check handle material and identification
In humid sites, corrosion-resistant materials such as resin handles are easier to handle. When holding many sizes, markings showing the model number or compatible range help prevent mix-ups. Check the body material and markings, including storage methods.
This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.