Tools

Sunex Half Moon Wrenches: Curved Access for Tight Spaces

Sunex Half Moon Wrenches reach fasteners that other tools miss in tight engine bays. Forged alloy steel, full polish, lifetime warranty.

Todd Bandel

07 Oct 2026 • 10 min read

Every mechanic has a fastener story, such as the bolt buried behind an exhaust manifold, the nut hiding under a crossmember, the bracket you can see but can't quite reach. Sunex half moon wrenches exist to solve exactly those problems, and in this review we break down what makes them worth a spot in your toolbox.

Quick Overview: What Are Sunex Half Moon Wrenches?

Sunex half moon wrenches are curved double box end wrenches designed for hard-to-reach fasteners in engines, chassis work, and equipment maintenance.

They are specialty obstruction tools, built for use in tight mechanical spaces where straight wrenches and ratchets simply run out of swing room. The curved design provides ease of access to fasteners in obstructed areas that would otherwise require partial disassembly.

The two core products in this line are the Sunex Tools 9935 SAE half moon wrench set and the 9935M metric half moon wrench set, both available as 5-piece box wrench set options through Summit Racing. The term "half moon" refers to the crescent-shaped profile that arcs around obstructions, setting these apart from any standard wrench set or straight obstruction wrench.

Key benefits at a glance:

Maximum access in confined areas where straight tools cannot swing
Secure grip from a double box end configuration on every wrench
Full polished chrome finish for easy cleaning after greasy engine bay work
Lifetime warranty support from Sunex Tools against defects in material and craftsmanship

Sunex Tools 9935 SAE Half Moon Wrench Set

5/16"x3/8" - 13/16"x7/8", Fully Polished, 5-Piece (Includes Roll-Case)

Amazon

Summit Racing Equipment

Sunex 9935 SAE Half Moon Wrench Set: Key Features

The 9935 is the SAE half moon wrench set, making it the best choice for domestic vehicles, older equipment, and any job that calls for inch-based fasteners.

The wrench set includes 5 tools, each with a box end on both sides. SAE sizes are paired as follows: 5/16″ × 3/8″, 7/16″ × 1/2″, 9/16″ × 5/8″, 11/16″ × 3/4″, and 13/16″ × 7/8″.
Sunex half moon wrenches are forged from alloy steel , specifically chrome vanadium , then drop-forged and heat-treated for strength under professional shop use. This material gives the wrenches the toughness needed when job demands push torque to serious levels.
The full polish chrome finish resists corrosion, wipes clean quickly, and matches common socket set and wrench finishes already in your collection.
They feature double box-end configurations for improved torque and grip, meaning each unit engages the fastener fully rather than relying on open-end contact.
Sizes are stamped on both sides of the wrench body for quick identification, so you can find the right tool without flipping it over repeatedly.
The curved half-moon shape lets each wrench bridge over components like exhaust manifolds, crossmembers, and frame rails while still engaging the fastener squarely.
The wrenches come with a heavy-duty canvas pouch with individually labeled slots for convenient storage in a toolbox drawer or service cart.
Backed by the Sunex lifetime warranty against defects in materials and workmanship, this set is built for long-term, daily use.

SUNEX TOOLS 9935M Metric Half Moon Wrench Set, 5-Piece

Wrenches, Half-Moon, Box Ends, Metric, 12-point, 5-piece, Chrome Vanadium, Polished, Canvas Pouch, Set

Amazon

Summit Racing Equipment

Sunex 9935M Metric Half Moon Wrench Set: Key Features

The 9935M is the metric moon wrench set counterpart, designed for imported vehicles, European and Asian cars, and metric-based equipment.

The set includes five metric half moon wrenches with double box pairings: 8 mm × 10 mm, 11 mm × 13 mm, 14 mm × 15 mm, 17 mm × 19 mm, and 21 mm × 22 mm.
Construction is identical to the SAE version: finest-grade alloy steel, drop-forged, and precision-machined box-end geometry for strong fastener contact across all sizes.
Full polish chrome plating matches other Sunex Tools chrome hand tool lines, so a mixed metric and SAE setup looks consistent and professional in your collection.
The curved half moon design is particularly useful around transverse engines, tight suspension components, and under-hood brackets on compact metric vehicles where every bit of clearance matters.
Each wrench can be purchased individually under its own model number if you need to replace a single size or fill a gap.
Supplied with a durable canvas pouch labeled with each size, so you can order your tools and grab the right one without second-guessing during a repair.
The metric half moon wrench set carries the same Sunex lifetime warranty, making it warranted for daily use in repair shops and fleets — no gamble on durability.

Design Advantages: Why Choose a Half Moon Wrench?

Think of this section as a same-page link between the specs above and actual shop use below. Half moon wrenches solve access problems that straight double box or combination wrenches cannot handle, and they do it without needing a drive tool, impact gun, or partial teardown of surrounding parts.

The curved profile lets you reach fasteners positioned behind lines, hoses, or brackets. Power steering pump bolts, starter mounting hardware, bellhousing bolts — these are the jobs where a straight wrench hits the firewall and stops, but a half-moon wrench can arc around the component and still engage.

Wrenches feature a curved design for maximum access, and the 12-point radius corner design prevents rounding fasteners under heavy torque, which is critical when you are dealing with rusty or corroded hardware.

The double box configuration means each wrench offers two different box end sizes, reducing the count of tools needed and ensuring solid engagement on hex fasteners from both sides. Compared to a standard socket set, which often requires straight-line clearance behind the fastener, the half moon can swing where ratchets cannot.

The offset ends also help maintain knuckle clearance — your palm and fingers stay away from sharp edges and hot components in cramped engine bays, which anyone who has scraped a hand on a manifold stud can appreciate.

The slim beam profile and full polish surface let the wrenches slide between close-fitting components. The durability-curved design is tough enough to handle significant torque without flexing under load.

Sunex Tools Quality and Warranty

Sunex Tools is a long-standing manufacturer serving professional technicians, fleet mechanics, and serious DIY builders. Their products span hand tools, impact sockets, and specialty equipment, and the brand has earned trust across automotive, heavy equipment, and industrial maintenance environments.

Both the 9935 and 9935M sets are manufactured from premium alloy steel with drop forging and precise machining to meet professional torque demands. The forged grain structure provides superior strength compared to cast alternatives.
Sunex offers a lifetime warranty against defects. If a wrench fails under normal use due to material or workmanship issues, Sunex will replace or repair it. The coverage is fully guaranteed for the life of the tool, though misuse , like using a cheater bar or pry bar for excess leverage , falls outside warranty scope.
Sunex also produces complementary products like S-style wrenches, standard box end sets, impact sockets, and ratcheting wrenches. Pairing a half moon wrench set with these lines lets you build a cohesive toolkit from one brand you can trust.
User comments consistently highlight that warranty claims are handled promptly, with individual wrenches replaced without requiring the full set to be returned.

Applications: Where Half Moon Wrench Sets Excel

Half moon wrenches are specialty tools that shine in specific situations, making them a valuable addition rather than a replacement for your everyday wrench set and socket set.

Automotive repair:

Intake manifold nuts tucked behind throttle bodies
Alternator brackets on V-engines where straight tools snap against the block
Steering rack hardware buried behind subframe rails
Transmission bellhousing bolts accessible only from odd angles
Exhaust fasteners hidden near frame rails and heat shields

Heavy-duty and industrial:

Equipment maintenance where guards and housings restrict access
Hydraulic system fittings surrounded by lines and hoses
Machinery with hard-to-reach mounting bolts behind panels

DIY and home shop:

Restoration work on older vehicles that hide fasteners behind crossmembers
Off-road builds where aftermarket accessories crowd the engine bay
Project cars where you'd rather not remove surrounding components just to reach one bolt

Sunex half moon wrenches are useful in automotive repair, heavy maintenance, and DIY projects equally. Grab the SAE half moon wrench set for U.S. domestic vehicles and the metric half moon wrench set for imports — many mixed shops will find both needed in daily work.

How Sunex Half Moon Wrenches Fit Into a Complete Tool Setup

Half moon wrenches are not a direct replacement for standard wrench sets but are problem-solving tools that fill a gap nothing else covers. Think of them alongside your screwdriver sets, pliers, and ratchets; each has a role, and the half moon handles the situations that put your patience through the wringer.

Here is how a practical tool organization might look:

Tool Type	Role	When to Reach for It
Combination wrench set	Everyday fasteners	Open access, general work
Half moon wrench set	Obstructed fasteners	Behind components, tight arcs
Socket set with ratchet	Fast removal/install	Straight-line clearance available
Specialty pullers/extractors	Stuck parts	Seized or press-fit components

Each wrench in a 5-piece moon wrench set covers two sizes, so you get ten-size coverage without eating up drawer space. The included storage pouches can be hung on a pegboard or tucked into a drawer, keeping SAE and metric sets clearly separated so you avoid mix-ups. If you already buy Sunex impact sockets or ratcheting wrenches, these half moon sets share the same build quality and finish.

Buying Tips and Care for Long Tool Life

Choosing the right set and caring for it properly is what separates a tool that lasts a lifetime from one that ends up in the scrap bin. Here is what to expect and how to make the most of your purchase.

Pick your sizes wisely. If you work primarily on U.S. trucks and older domestic equipment, the SAE set is your choice. Late-model imports and European cars call for metric. Many shops will want to buy both.
Review your existing coverage. Check your current box wrench set and socket set for gaps. The half moon sets cover common sizes, but confirming overlap helps you write off redundancy and focus spending where it matters.
Price and availability. The Sunex half moon wrench set costs $35.99. At that price, this is not a hard decision for the access it provides. Note that the wrench set is currently out of stock at some retailers. When stock returns, delivery is estimated within 24 hours for shipped orders, and the set is available for pickup within 4 hours at participating locations. Retailers like Summit Racing and Amazon are reliable sources - share the product link with your shop manager if you need to order in bulk.
Care for the finish. Wipe down the full-polish chrome after each use to keep grime from building up. Store wrenches in their canvas pouch or a dry toolbox drawer to prevent corrosion over time.
Inspect regularly. Check box end openings for rounding, cracking, or deformation. If a wrench shows distortion, claim it under the lifetime warranty rather than forcing it onto fasteners; the tool is warranted, so use that coverage.
Purchase from reputable retailers. Buying from authorized sellers like Summit Racing ensures you receive genuine Sunex Tools products with full warranty backing, so you are not left guessing whether your claim will be honored.

Sunex half moon wrenches are a focused, practical investment. They will not replace everything in your toolbox, but when a tough fastener is buried behind a component and nothing else can reach it, these curved wrenches are the tools you will be glad you purchased.

Thank you for reading!

Your friend,

Todd