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With over 60 years of experience, Proto has been a leading manufacturer of hand tools and accessories for applications in chemical, geothermal, petrochemical, marine, oil & gas, power and refining industries. Headquartered in New Britain, Connecticut, United States, Proto Tools offers a line of products, including a wide range of sockets, wrenches, ratchets, clamps, master sets, punches, chisels and tethered tools. Read More


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WrenchesView all

  • Adjustable Wrench Sets
  • Adjustable Wrenches

    Proto steel / alloy steel wrenches feature black oxide / satin / chrome finish that provides corrosion resistance and an extra-wide jaw (max 1.5 inches) for a tight fit. They are available in cushion grip, over-moulded rubber, plain grip and steel handle variants.

  • Box End Wrench Sets

    Proto metric / SAE wrench sets come with 12-point box end wrenches for fine indexing and speed improvement. They comfortably fit into 4, 6 and 12-point fasteners.

  • Box End Wrenches

    Proto box end wrenches come with closed loops at both ends to fit hexagonal or square bolts. These box-end wrench sets have an enclosed head on each end of the handle that provides more contact to the fastener and allows more torque than an open-end wrench since the box end is less likely to slip off the fastener.

  • Chain Wrenches and Tongs

    Proto chain wrenches and tongs feature a U-shaped opening that contacts a fastener from the top or side; ideal for tightening jam nuts, check nuts or lock nuts. These wrenches further feature an ultra-thin profile that provides better access in close quarters and have a non-reflective black oxide finish.

  • Check Nut Wrenches

    Proto check nut wrenches provide a firm grip while applying torque to rotate stubborn or worn-out fasteners. They feature a 12-point box end design that guarantees fine indexing to improve the speed and facilitates cinching or breaking bolts in difficult locations.

  • Combination Wrench Sets

    Equipped with a rounded head to offer more contact with hexagonal fasteners and an opening in the wrench head to allow obstructions to pass through. Feature 6- / 12-point box end design allowing fine indexing for improved speed and access. Sets available with 3 to 10 number of pieces

  • Combination Wrenches

    Widely used Proto hand tools with an anti-slip design for easy application. Available in 6-point and 12-point box ends and satin / chrome / full polish / black oxide finish options

  • Dial Torque Wrenches

    Dial torque wrenches designed for torque measurement in industrial machinery & hydraulic equipment calibration and automotive maintenance & repair operations. All steel / aluminium torque transfer components and high alloy tension drive design

  • Electronic Torque Meter Accessories

    Wide range of bench-mount torque transducers, brackets for transducers, in-line extension transducers, in-line torque transducers and torque tester floor stands to enhance and extend the capabilities of an electronic torque meter

  • Electronic Torque Meters

    Electronic torque meters suitable for testing and calibrating torque controlled tools and equipment in research & development, machinery tuning and maintenance. Large digital display and compact design for accurate readings & secure storage and transportation, respectively. Available in battery operated and AC / DC adapter power source variants

  • Electronic Torque Wrenches

    Electronic torque wrenches designed for fastening nuts and bolts at accurate torque pressures for automotive, industrial machinery and hydraulic equipment calibration. Digital display with visual alerts & audible buzzer for delivering accurate torque output. Available in 0.01, 0.1 and 1 N-m graduation variants

  • Flare Nut Wrench Sets
  • Flare Nut Wrenches

    Intended for use with hex nuts made of soft metals (like brass or aluminium) as they do not strip the sides. Available in SAE / Metric dimensions and different sizes

  • Hex and Torx Key Sets

    Designed to turn bolts and screws with specialised sockets in the fastener head. Feature a black oxide finish for resistance against corrosion and a molded plastic holder (selected models). Available in ergonomic, fold-up, L-shaped, plain, T-shaped handles for more turning power & a comfortable grip

  • Hex/Torx Keys

    Used for tightening and loosening hexagonal bolts and other mechanical fasteners. Come with steel / alloy steel blades to resist rust and plain- / cushion-grip handles for fatigue-free performance. Offered in L and T shaped variants

  • Interchangeable Head Torque Wrenches

    Meet ASME B107.14M specifications to handle a variety of assembly and field jobs using fewer wrenches and minimal manual effort. Feature an audible click indicator to indicate the status of the requisite torque setting. Offer +/-4% CW and +/-6% CCW accuracies

  • Interchangeable Torque Wrench Heads

    Feature interchangeable heads for a variety of assembly operations. Ideal for applications in metalworking and plumbing industries and are available in box end / open end / square drive heads

  • Micrometer Torque Wrenches

    Ratcheting head micrometer torque wrenches designed to deliver preset torque output to a mechanical fastener in military and aerospace applications. Can be calibrated using a mechanical load in a horizontal position, followed by a 3-click test at 20, 60, and 100 % of maximum instrument capacity

  • Open End Wrench Sets

    SAE / Metric wrench sets designed for loosening and tightening bolts, nuts and other fasteners. Feature a compact design to access fasteners from the top, side, and in tight spaces. Available in satin, black oxide and full polish variants

  • Open End Wrenches

    Wrenches with two U-shaped open ends for tightening / loosening nuts and bolts. Available in different head angles and SAE / metric dimensions

  • Pipe Wrenches

    Used to turn threaded pipe and pipe fittings for installation or removal in plumbing assembly lines. Featuring a large knurl and power threads to provide fast and positive jaw adjustment and a standard handle length with wide gripping surface to offer increased comfort

  • Ratcheting Wrench Sets

    Integrated with a box end design on one end of the handle with a gear mechanism for free rotation of the wrench without having to remove the wrench head from the fastener. Suited to fasten or loosen stubborn nuts and bolts. Available in sets including 3 to 22 pieces

  • Ratcheting Wrenches

    High-quality Proto professional tools available in different offset angles for smooth application in tight spaces

  • Service/Pump Wrenches

    Equipped with a 30-degree head that allows access in difficult-to-reach fastener assemblies, satin finish to provide corrosion resistance and a slip-resistant grip for continuous-duty use. Feature a thin pattern for use on jam nuts, check nuts or lock nuts

  • Spanner Wrenches

    Designed to provide grip and mechanical advantage while applying torque to turn nuts and bolts. Feature alloy steel construction with a non-reflective black oxide finish for withstanding harsh industrial conditions and job-site abuse

  • Striking and Slugging Wrenches

    High-strength steel wrenches with a large striking surface; ideal for use with hammers and sledges to tighten or loosen damaged / stubborn fasteners. Available in 6 pt. and 12 pt. box ends for fine indexing

  • Structural and Spud Wrenches

    Equipped with a tapered spike at the handle end for aligning bolt holes when installing automotive components, beams, girders or pipe fittings. Feature a long offset handle for greater leverage and clearance to knuckles and obstructions. Available in overall lengths ranging from 11 to 30 inches

  • Torque Multipliers

    Capable of precisely tightening & loosening large industrial bolts for a gearbox assembly. Feature a single-stage planetary gear system delivering multiplication ratios up to 6:33:1 for transferring the highest torque in the most compact setups

  • Torque Wrench Accessories

    Wide range of torque angle meters, torque wrench software and digital angle adapters ideal for repair & maintenance services. Deliver a maximum torque of 250 ft-lb; offered in 2-9/32, 3-23/64 and 5 inch length options

Sockets and BitsView all

  • Crowfoot Socket Wrench Sets

    Suitable for use in hard-to-reach or restricted access areas where a standard wrench or ratchet cannot reach. Feature a full-polish finish to reduce oxidation reactions on the exposed surfaces and an anti-slip open-end design for low-torque applications

  • Crowfoot Socket Wrenches

    Steel-made socket wrenches with an anti-slip design, arched surface and a locking hole. Designed for use in hard-to-reach areas where commonly used 6 pt. and 12 pt. sockets and wrenches do not fit

  • Hand Ratchets

    High quality precision hand ratchets commonly used for loosening and fastening nuts and bolts. Long handle head ratchets feature sealed design preventing debris from entering the ratchets. Offered in pear, round and sealed head styles

  • Power Sockets

    Capable of accommodaring heavy fasteners and hold them tightly during use. Utilise heavy-duty magnets made from a rare earth magnet alloy / nylon blend. Socket size stamped on the tool for easy identification and equipped with a side locking hole

  • Ratchet Accessories
  • Socket Adapters

    Used with power sockets for tightening and loosening fasteners with power wrenches. Capable of delivering more speed and torque than a hand wrench. Feature a forged steel body with the size stamped on the tool for easy identification

  • Socket Bit Sets

    Combination of a screwdriver bit and a hex socket featuring alloy steel construction with a polished chrome finish. The set includes socket bars and socket clips and extra long bits to provide additional reach

  • Socket Bits

    Have chrome vanadium / heat-treated alloy steel construction for rugged use in metalworking and automotive industries. SAE and metric variants available in different finish options and drive sizes

  • Socket Extensions

    Different types of flex and wobble socket extensions used to extend the reach of sockets in confined spaces or hard-to-reach areas

  • Socket Sets

    Includes a wide range of SAE and Metric Proto socket sets, available in both deep and flex socket point styles, for applications in automotive manufacturing, steel fabrication and fleet maintenance

  • Socket Wrench Accessories

    Includes socket bars, rails, clips and drivers; hinge handles; spinner ratchets; drive plugs; socket bit holders and universal joints commonly used with sockets, wrenches, screwdrivers and other Proto tools. Offered in different drive sizes and finish options

  • Sockets

    Includes sockets with a TorquePlus internal design, making them ideal for applications with damaged fasteners. Available in different SAE and metric sizes

  • Spark Plug Sockets

Screwdrivers and NutdriversView all

  • Bit Sets

    Insert, Torx and power bit sets comprising bit sockets and socket holders; can be used with an impact or any standard drill. Number of pieces in the sets range from 7 to 38

  • Multi-Bit Screwdrivers

    Ideal for use with Hex, Phillips, Slotted, Torx, Tri-Wing and Wing Nut type screws. Feature an extra-long handle for improved access in confined or restricted areas. Come equipped with a ratcheting magnetic bit driver and magnetic T-handle bit driver

  • Nut Driver Sets

    Integrated with a precision head for securing hex nuts and hollow shafts for accommodating long bolts. Feature accurately formed, heat-treated hex openings with color-coded handles for easy identification during use

  • Nut Drivers

    Equipped with a socket attached to a shaft and a cylindrical handle for tightening and loosening mechanical fasteners. Similar in appearance and utility with a screwdriver. Feature color-coded handles for easy identification

  • Screw Starters

    Double-end screw starters to install or remove standard and Phillips screws in hard-to-reach areas. Feature a pocket clip and a knurled aluminium handle for maximum user comfort over prolonged hours

  • Screwdriver Bit And Nutsetter Accessories

    Bit extensions and hex bits for fastening metal and self-tapping screws. Square bit extensions feature forged steel construction for less surface porosity and high tensile strength. Available in body diameters of 1/4 and 3/8 inches

  • Screwdriver Bits And Nutsetters

    Suitable for driving lag bolts and screws, as well as loosening frozen nuts either with a cordless drill or manually. Feature steel / tool steel / S2 steel construction for strong torsion and resistance against impacts or vibrations. Offered in 1, 1.875 and 6 inch length options

About Proto

Proto Tools catalogue includes a wide range of sockets, wrenches, ratchets, screwdrivers, hex keys, pliers, snips, clamps, master sets, punches, chisels and tethered tools. Proto torque wrenches, also known as digital torque wrenches, provide a precise torque reading by measuring turning force electronically to avoid over tightening of fasteners. These wrenches are commonly used to apply consistent torque on assembled products for safety and quality control applications. They feature a digital display with visual alerts & an audible buzzer for delivering accurate torque output. Proto socket sets feature TorquePlus configuration with radius-corner design for shifting the stresses away from the corners and uniformly distributing over a large surface area. The internal design of these sockets further reduces rounding of the edges and offers more flexibility to turn worn out or rusted fasteners. Choose from a wide range of these quality wrenches & other company products, such as socket bits, hand-held punches & chisels on Raptor Supplies.

Things To Consider

Cross-Reference Alternatives

Proto Tools torque wrenches (manufacturer's part numbers) generally cross individual reference to the equivalent AMPCO Metal model numbers. So, if you are looking for a competitor torque wrench that is either out of stock or obsolete, chances are Raptor Supplies has the equivalent Proto torque wrenches available. Customers can also cross-reference most of these couplings using the last five digits of the model numbers.


These Proto torque wrenches and steel crowfoot wrenches are small in size and require compact packaging. Hence, they are delivered in packs consisting of several pieces and are suitable for courier shipment and not air freight.

Major Trade Names

Proto Competitive Advantages

Proto Facom insulated ratchets

Proto Facom insulated ratchets are ideal for fastening nuts and bolts for applications prone to electrical leakage. These Proto professional tools have two colour warning handle insulation that changes colour to yellow if the insulation integrity is compromised during the operation. They have a spring ball tip for securing the sockets & accessories while fastening.

Frequently Asked Questions

Which tools are offered by Proto?

Proto offers various tools, including storage units, hand sockets, drive tools, impact sockets, wrenches, pliers, clamps, snips, screwdrivers, hex keys and torque wrenches.

What is the difference between a socket wrench and a ratchet?

Socket wrenches are designed to fasten nuts & bolts. However, these tools are not ideal for tight spaces as they need to be lifted after each fastening cycle. Whereas, ratcheting wrenches have pawls that enable the wrench to spin in one direction while turning the bolt in another.

Can the standard / regular sockets be used with impact wrenches?

No, regular sockets should not be used with impact wrenches. These sockets are likely to shatter against the power of impact wrench because of their thin wall design and construction material.

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