Craftsman 31517390 router Parts

To replace router bits on your Craftsman router model 31517390, unplug the router, loosen the collet nut, remove the old bit, then insert the new bit and tighten the collet securely. A properly seated bit helps prevent slipping, chatter, and poor cut quality.

Safe, correct steps to change a router bit

• Unplug the router (or remove the battery if it is cordless) before touching the collet.
• Press the spindle lock (if your router has one) or use two wrenches (one on the spindle, one on the collet nut).
• Turn the collet nut counterclockwise to loosen.
• Pull the old bit straight out.
• Insert the new bit shank fully, then back it out about 1/16 to 1/8 inch so it is not bottomed out.
• Tighten the collet nut firmly (snug plus a bit more); do not overtighten.

Quick fit check (before you cut)

Use this checklist after tightening:

• Bit does not wiggle when you try to twist it by hand
• Shank is inserted deep enough (most of the shank is inside the collet)
• Collet nut turns smoothly and seats fully
• Router base and bit clear the work surface and fence

Common issues and what they usually mean

Symptom	Most common cause	What to do
Bit slips downward while routing	Bit bottomed out or collet dirty	Re-seat bit with slight pull-back; clean collet and nut
Excess vibration or chatter	Bent bit, wrong speed, or poor clamping	Try a different bit; adjust speed; re-tighten collet
Collet nut feels “stuck”	Resin buildup or overtightened previously	Loosen with correct wrenches; clean threads and collet

Why it matters

A router bit spins at very high RPM. Correct collet tightening and proper shank seating reduce the chance of bit slippage, burning, rough edges, and loss of control during a cut.

For more help finding the exact model number details when ordering accessories or parts, use how to find your appliance model number (and what it means for parts).

Last updated: February 2026

Yes. Craftsman has made router tables and router table accessories that can be used with many Craftsman routers, including models in the 315-series like the Craftsman 31517390. The key is matching the table’s mounting pattern and the router’s base size so the router installs safely and stays aligned.

How to check if a router table will fit your Craftsman 31517390

Before buying or installing a table, we recommend confirming these common fit points:

• Mounting method: direct-mount to the table top or to an insert plate
• Bolt pattern: whether the table or plate is pre-drilled for your router base
• Base diameter and opening size: the router base must sit flat and clear the opening
• Bit height adjustment: whether you can adjust from above the table (depends on table and router setup)
• Switching: a table with a dedicated safety switch is preferred for table use

Typical router table options (what you’ll see most often)

Router tables generally fall into a few categories; this helps you choose the right style for your shop and projects.

Router table type	Best for	What to watch for
Benchtop table	Small shops, occasional use	Smaller fence and work surface
Standalone/cabinet-style	Frequent use, better dust control	More space and setup time
Table extension (workbench/saw)	Saving space	Compatibility and stability

Why it matters

A router table that does not match the router’s mounting pattern or does not support the router securely can cause vibration, poor cut quality, and unsafe operation. A correct fit keeps the bit centered, the fence aligned, and the workpiece controlled.

Helpful next step

If you are confirming the exact model number before shopping for accessories, use how to find your appliance model number (and what it means for parts).

Last updated: February 2026

A Sears Craftsman router (like the Craftsman 31517390) is a handheld power tool used to shape, trim, and cut wood by spinning a router bit at high speed. We commonly see it used for edge profiles, dadoes, rabbets, and hinge mortises in woodworking.

What it’s used for

A router is basically a motor that holds a collet; the collet grips interchangeable bits to cut wood (and some plastics) with control and repeatability.

Common projects include:

• Rounding over or beveling edges on shelves and tabletops
• Cutting grooves (dadoes) for cabinet joinery
• Trimming laminate or veneer flush to an edge
• Cutting rabbets for back panels
• Making mortises for hinges or hardware

Key features you’ll typically see on Craftsman routers

Exact specs vary by version and configuration, but most corded Craftsman routers in this class share these core elements:

• Collet sizes: commonly 1/4-inch (some models also accept 1/2-inch)
• Depth adjustment: a depth ring or rack-and-pinion style adjustment
• Base style: fixed base, or a plunge base on some setups
• Speed control: single-speed or variable-speed depending on the model
• Dust control: optional port or base opening for chip ejection

Quick reference: fixed base vs plunge base

Feature	Fixed base router	Plunge router
Best for	Edge work, consistent depth cuts	Starting cuts in the middle of a board
Depth changes	Set before the cut	Adjust during setup; plunge to start
Typical feel	Stable, simple	More versatile for mortises and inlays

Why it matters

Knowing whether your Craftsman 31517390 is set up as a fixed base or plunge style helps you choose the right bit, set cutting depth correctly, and troubleshoot issues like burning, chatter, or rough finishes.

Helpful related reading

• How to find your appliance model number (and what it means for parts)

Last updated: February 2026