Wrenches

What Are Wrenches?

Wrenches (spanners) apply torque to nuts and bolts by gripping the fastener across the flats. From quick field adjustments to precise assembly, the right wrench size lets you tighten or loosen hardware without rounding the fastener.

Types of Wrenches We Carry

Adjustable Wrenches – Movable jaw fits multiple fastener sizes; great for service calls and toolbags.
Combination Wrenches – Open end on one side for speed, box end on the other for power and access.
T-Handle Hex Wrenches – High leverage and control for hex/Allen fasteners in equipment and fixtures.
Wrench Sets – Organized SAE and metric ranges so you always have the size you need.

How to Choose the Right Wrench

Match the standard: Identify SAE (inch) or metric fasteners and choose the same standard in your wrench.
Pick the fit: Use the box end when possible for maximum contact; open end for speed or tight spots.
Consider access: Slim heads, offset angles, and longer handles improve reach and leverage.
Finish & durability: Chrome for corrosion resistance and easy wipe-down; black oxide or phosphate for reduced glare.

Quick Size Reference

Common SAE Sizes

1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"

Common Metric Sizes

8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 17 mm, 19 mm

Tip: Wrench size equals the fastener’s width across flats. Use the tightest fitting size to avoid rounding.

Applications

Automotive & Equipment: Assembly, brake & suspension service, and general repairs.
Plumbing & HVAC: Service work where adjustable jaws and slim heads help in tight spaces.
MRO / Fabrication: Machine fastening, jig setup, and maintenance tasks.

Use & Care Tips

Seat the wrench fully on the flats and pull—don’t push—when possible for safety.
Avoid using cheater bars that can over-stress the tool; step up to a longer wrench instead.
Keep jaws clean; lightly oil adjustable mechanisms for smooth action.

Wrenches FAQs

What’s the difference between SAE and metric wrenches?

SAE sizes are in inches; metric sizes are in millimeters. Match the wrench standard to the fastener for a snug fit.

When should I choose an adjustable wrench?

Use adjustables for mixed sizes or quick service work. For high torque or repetitive tasks, a fixed-size combination wrench offers a stronger, more secure grip.

Box end or open end, when do I use each?

The box end contacts more flats and resists slipping—use it whenever you can. The open end is faster for spinning a nut and reaching confined areas.

Do I need both SAE and metric sets?

Yes, if you work on modern equipment or vehicles, you’ll encounter both standards. A dual-standard set prevents rounding from “close but not exact” sizes.

How do I prevent rounding fasteners?

Use the exact size, keep the wrench square on the flats, and apply steady pressure. If a fastener is damaged, try the box end with a 6-point profile for better bite.