Craftsman 31517400 double insulated router Parts

To replace router bits on your Craftsman 31517400 double insulated router, unplug the tool, loosen the collet nut, remove the old bit, then insert the new bit correctly and tighten the collet securely. This prevents bit slip, chatter, and unsafe operation.

Steps to change the bit (collet method)

• Unplug the router (or remove the battery if applicable).
• If your router has a spindle lock, press and hold it.
• Use the correct wrench to 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 clockwise until the bit is firmly clamped.

Quick checks before you power back on

• Confirm the bit shank size matches the collet (commonly 1/4 inch or 1/2 inch).
• Make sure the bit is straight and fully seated (not cocked).
• Verify the collet nut is tight; a loose collet can let the bit walk out.
• Spin the bit by hand to ensure it clears the base opening.

Common problems and what they mean

Symptom	Likely cause	What to do
Bit slips during a cut	Bit bottomed out or collet not tight	Reinsert with slight back-out; retighten
Excess vibration	Bent bit, dirty collet, or wrong shank size	Clean collet; use correct shank; replace bit
Collet feels stuck	Resin or sawdust buildup	Clean collet and nut; inspect for damage

Why it matters

A router bit spins at very high RPM. Proper collet clamping and correct bit insertion depth help prevent kickback, burning, rough edges, and damage to the collet, motor shaft, or workpiece.

Helpful DIY reference

For safe electrical troubleshooting if your router will not start after a bit change, use how to use a multimeter to test electrical parts video.

Last updated: February 2026

A Sears Craftsman router (like the Craftsman model 31517400) is a handheld, corded woodworking power tool that spins a cutting bit at high speed to shape edges, cut grooves (dados), and make precise joinery. This model is a double insulated router, so it’s designed to run without a separate grounding wire.

What you can do with a Craftsman router

Routers are used for both rough material removal and fine finishing work. Common tasks include:

• Rounding over, chamfering, and profiling edges
• Cutting rabbets and dados for shelves and panels
• Trimming laminate or veneer flush to an edge
• Cutting hinge mortises and other shallow recesses
• Making repeatable cuts with a straightedge or template guide

Key features to know (typical for this tool type)

Because we do not have model-specific documentation for 31517400 here, we focus on what’s standard for a Craftsman double insulated router:

Feature	What it means	Why you care
Double insulated housing	Extra internal insulation instead of a ground wire	Helps reduce shock risk when used correctly
Variable depth adjustment	Sets how deep the bit cuts	Controls accuracy and prevents over-cutting
Collet and nut	Clamps the router bit shank	A worn collet can cause bit slip or vibration
Base and sub-base	Supports the router on the work surface	A stable base improves cut quality

Safety and setup basics we recommend

Unplug the router before changing bits or making adjustments.

• Use sharp, undamaged router bits; dull bits burn wood and strain the motor
• Tighten the collet firmly; insert the bit shank fully, then back it out slightly before tightening
• Make multiple shallow passes instead of one deep pass
• Secure the workpiece with clamps; never hold small pieces by hand
• Wear eye and hearing protection; use dust collection when possible

Why it matters

Using the right router technique protects the motor, improves cut quality, and reduces kickback risk. Most “router problems” come from bit issues, incorrect depth settings, or unstable workholding, not the motor itself.

For general repair and troubleshooting skills that apply to corded tools, we recommend how to use a multimeter to test electrical parts video.

Last updated: February 2026

Yes. Craftsman has made router tables and router-table accessories that can be used with many Craftsman routers, including models like the Craftsman 31517400 (double insulated router). The key is matching the table’s mounting plate and the router’s base-hole pattern so the router mounts securely and stays aligned.

What to check before you buy a router table

A router table is only a good fit if the router mounts correctly and the bit height can be adjusted safely.

• Confirm the router table includes a mounting plate (or insert plate) that supports your router’s bolt pattern
• Check the maximum bit opening and whether it accepts guide bushings (if you use templates)
• Look for a flat, rigid tabletop and a fence that locks square
• Verify dust collection options (fence port and/or cabinet port)
• Make sure the switch is easy to reach (paddle-style is common)

Compatibility quick guide (what usually works)

Because router tables are often universal, compatibility usually comes down to the plate and clearance.

Item to match	What “compatible” means	Why it matters
Mounting plate	Pre-drilled for Craftsman patterns or drillable	Prevents vibration and misalignment
Base opening	Large enough for your bits	Avoids rubbing and unsafe contact
Adjustment access	Above-table adjustment supported (if needed)	Faster, safer bit-height changes
Fence	Straight, adjustable, locks firmly	Cleaner cuts and repeatability

Why it matters

A properly matched router table improves control for edge profiles, dados, and joinery; a poor fit can cause chatter, inaccurate cuts, and unsafe handling. For a double insulated router like the Craftsman 31517400, stable mounting and good dust control also help keep the motor cooler and the work area clearer.

Helpful next step

If you are shopping by model number or trying to confirm what fits your setup, use how to find your appliance model number (and what it means for parts) to make sure you are referencing the exact Craftsman 31517400 identification when searching.

Last updated: February 2026