Learn how to use a multiwrench for nuts, bolts, repairs, and field fixes. Full beginner to expert guide for compact EDC wrench tools.

How to Use a Multiwrench

A multiwrench is one of the most compact and underrated tools in EDC . Unlike a bulky wrench set or a full multitool, a multiwrench is flat, lightweight, and sized to fit inside a wallet, pocket, dog tag tool kit, Altoids tin, or micro pouch.

Despite its size, a good multiwrench can tighten hardware, repair gear, adjust camp equipment, fix fishing tools, tune traps, maintain small machines, and even assist with improvised shelter building.

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What a Multiwrench Is

A multiwrench is a flat tool with multiple wrench sizes or shapes built into a single piece of metal. It typically includes:

Open wrench slots
Hex openings
Wingnut slots
Square and round openings
Flat driver edges
Tight “pinch” channels for small hardware

3. Works for Trapping & Tool Building

Flat wrenches tighten:

Snare locks
Trigger parts
Bolt-on trap hardware
Wire compression pieces

How to Identify the Wrench Sizes

Your multiwrench includes different shapes for different hardware types.

Hex Slots

Standard nuts and bolts (most common hardware).

Open Slots

Good for oversized bolts and wingnuts.

Square Slots

Used for square nuts, small stove hardware, and trap components.

Slotted Channels

Used to pinch or twist small hardware with higher torque.

How to Use the Multiwrench

Step 1: Select the Correct Slot

Slide the nut or bolt head into different slots until you find the one that fits:

Not loose
Not tight
Not wobbling

A good fit = more torque and less damage.

Step 2: Hold the Tool Correctly

Gripping a flat wrench is different than a bulky wrench:

Two-Finger Pinch Grip

Best for:

Small nuts
Light adjustments
Gentle tightening

Four-Finger Wrap Grip

Hold the narrower side of the multiwrench with all fingers.
This increases force for:

Medium-sized bolts
Snare locks
Trap hardware

Step 3: Apply Torque Safely

Turn slowly and steadily.
Avoid sudden force or twisting.

If the nut resists:

Switch to a smaller slot
Use a two-hand grip
Change the angle
Add a stick, coin, or rock as a leverage extension

Small wrench, big power.

Step 4: Tighten Correctly

To tighten:

Keep the wrench flat
Turn clockwise
Maintain steady pressure
Stop once resistance is firm
Avoid overtightening

Why?
Small bolts strip faster than large ones.

Step 5: Loosen Stubborn Hardware

If a bolt won’t move:

Wiggle gently
Switch slots
Add leverage
Add lubrication (water, oil, even fat)
Tap lightly near the base

Never bend the multiwrench — use technique instead.

Specialty Uses of the Multiwrench

Maintaining Fishing Gear

Use the multiwrench for:

Tuning reel hardware
Adjusting lure components
Tightening swivels
Securing jig heads

Pairs with:
→ How to Choose and Use Fishing Hooks
→ Making a Fishing Kit

Fixing Outdoor Gear

The multiwrench can handle field repairs on:

Stove bolts
Chair frames
Tent poles
Buckles
Flashlight hardware
Optics mounts
Pack screws
Tripod fittings

Emergency Mechanical Repairs

Useful for:

Bike hardware
ATV small bolts
Chainsaw tension screws
Solar panel brackets

Your multiwrench can get you home, or keep you going.

How to Improvise a Wrench

If you lose your multiwrench, you can improvise:

1. Two Flat Rocks

Pinch hardware between them and twist.

2. A Folded Piece of Metal

Like a can lid bent into a U-shape.

3. A Stick Notch

Carve a notch into the end of a hard stick.

4. Pliers Made From Two Sticks

Use cordage as a hinge → primitive wrench.

5. Flat Knife Spine (Carefully)

Grip the bolt and turn softly.

These aren’t as effective as your tool — but good enough in a pinch.

Common Beginner Mistakes

Using the wrong size slot
Applying force too quickly
Twisting the tool sideways
Trying to pry with it
Over-tightening small bolts
Working at awkward angles
Using the sharp edges incorrectly

Proper technique prevents damage to both tool and hardware.

FAQ

Q: Can a flat multiwrench really handle big torque?
A: Yes — when used with leverage and proper slot fit.

Q: Will it strip bolts?
A: Only if the wrong-sized slot is used or too much sideways pressure is applied.

Q: Can it replace a full wrench set?
A: For EDC, outdoor gear, small repairs, and survival tasks — yes.
For major mechanical work — it’s a backup tool.

Q: Does stainless steel hold up under pressure?
A: Absolutely — especially in a flat, compact format.

How to use a Multiwrench