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Square Drive Torque Wrench Accessories

Square drive torque wrench accessories react the load of hydraulic torque wrenches so the tool turns the nut instead of itself — this group covers reaction arms, reaction paddles, tube extensions, and back-up spanners sized to match a given drive size and adjacent obstruction. The right accessory is set by your wrench series, square drive size, socket reach, and the fixed point the arm bears against. If you are replacing a worn or discontinued unit, send your specs for a cross-reference.

Can’t find the exact part? Send the part number or specs — we’ll quote it.

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How to Choose a Square Drive Torque Wrench Accessory

Square drive size — the drive must match the wrench output (typically 3/4", 1", 1-1/2", or 2-1/2"); confirm the drive stamped on your tool before ordering.
Wrench series — reaction arms and paddles are built to specific tool families; match the accessory to your PTW, ETW, or HMT series so the geometry and mounting line up.
Material — reaction members are typically forged or high-strength alloy steel to carry full tool torque without flexing; verify the rating against your wrench's maximum output.
Rating / capacity — the accessory should be rated to or above the wrench's torque output so it reacts the load with margin; undersizing the reaction point is the most common failure.
Reach and clearance — standard, extended, and tube-extension styles change how far the reaction point sits from the nut; measure the distance to a solid bearing surface before choosing length.
Application — flange work, blind bolts, and tight bundles each call for a different reaction style; identify the fixed point the arm or paddle will push against.

Which Reaction Accessory Is Right for the Job?

Choose by where the tool finds a fixed point. Use standard reaction arms for PTW and ETW-series when an adjacent nut or solid edge sits within normal reach. When the bearing surface is farther out, the Enerpac SRSX-Series extended reaction arms and the WTE-Series extended reaction arm add length to reach it. For congested flanges and bolt circles, WRP-Series reaction paddles spread the load against the next bolt, while RTEX-Series reaction tube extensions stand the reaction point off a deep or recessed joint. On the holding side, a back-up spanner grips the opposing nut so the bolt is tensioned instead of spun.

Complete the System

A reaction accessory only works behind the tool it is built for. Pair it with an Enerpac HMT torque wrench matched to your drive size and torque range, and browse the full torque wrench accessories range for sockets, links, and pump-side parts. For the pump, hose, and coupler side of the setup, see the broader high pressure bolting tools category so the whole train is rated to the same pressure.

Cross-Referencing an Obsolete Square Drive Torque Wrench Accessory

When a reaction arm or paddle is worn, damaged, or no longer carried, the part you need is usually still available under a current series. Northern Hydraulics has cross-referenced bolting accessories since 1963, matching obsolete reaction members by drive size, wrench series, and reach so the replacement reacts the same load against the same fixed point. Give us the tool series and the failed part's dimensions and we will find the equivalent — request a cross-reference.

Square Drive Torque Wrench Accessories – Frequently Asked Questions

How do I measure for the right reaction arm?

Confirm the square drive size stamped on your wrench, then measure from the nut centerline to the nearest solid bearing surface the arm can push against. If that distance exceeds a standard arm's reach, step up to an extended arm or a tube extension so the reaction point lands on a fixed point.

What torque rating does a square drive reaction accessory need?

The accessory should be rated to or above the maximum torque output of your hydraulic wrench so it reacts the full load with margin. Match the part to your wrench series rather than the bolt size, since the reaction member carries the tool's output, not the joint torque alone.

What square drive sizes do these accessories fit?

Square drive torque wrench accessories are typically built for 3/4", 1", 1-1/2", and 2-1/2" drives to match common hydraulic wrench series. Confirm the drive on your tool before ordering, since drive size and wrench series together determine fitment.

What's the difference between a reaction arm and a reaction paddle?

A reaction arm bears against a single adjacent solid point, while a WRP-Series reaction paddle spreads the load against the next bolt on a tight flange or bolt circle. Use a paddle where there is no flat edge to react against but neighboring bolts are close.

When do I need an extended reaction arm or a tube extension?

Use an extended style when the fixed bearing surface sits beyond a standard arm's reach. The Enerpac SRSX-Series extended reaction arms add length along the joint face, while RTEX-Series reaction tube extensions stand the reaction point off a deep or recessed connection.

What does a back-up spanner do?

A back-up spanner holds the opposing nut so the fastener is tensioned instead of spinning the whole bolt. It is used on through-bolted joints where both ends are free to turn.

Will these accessories work with my hydraulic torque wrench?

Reaction arms, paddles, and extensions are matched to specific wrench families such as PTW, ETW, and HMT series, so pair them with the right tool. Browse compatible Enerpac HMT torque wrenches or check the full torque wrench accessories range to confirm fit.

Can you cross-reference an obsolete reaction arm or paddle?

Yes. Most discontinued reaction members can be matched to a current part by drive size, wrench series, and reach so the replacement reacts the same load. Send the tool series and the failed part's dimensions and we will identify the equivalent — request a quote.

Square Drive Torque Wrench Accessories

Products

Enerpac 1-11/16" Socket for 1.5" Square Drive, BSH1543

Enerpac 2-15/16" (75mm) Socket for 1" Square Drive, BSH1075

Enerpac 50mm Socket for 3/4" Square Drive, BSH7550

Enerpac 1-11/16" Socket for 3/4" Square Drive, BSH7543

Enerpac 36mm Socket for 3/4" Square Drive, BSH7536

Enerpac 32mm Socket for 3/4" Square Drive, BSH7532

Enerpac 1-1/16" (27mm) Socket for 3/4" Square Drive, BSH7527

Enerpac 2" Socket for 3/4" Square Drive, BSH75200

Enerpac 3/4" (19mm) Socket for 3/4" Square Drive, BSH7519

Enerpac 1-3/4" Socket for 3/4" Square Drive, BSH75175

Enerpac 2-5/8" Socket for 1.5" Square Drive, BSH15263

Enerpac 5-7/8" (150mm) Socket for 2.5" Square Drive, BSH25150

Enerpac 5-1/2" (140mm) Socket for 2.5" Square Drive, BSH25140

Enerpac 125mm Socket for 2.5" Square Drive, BSH25125

Enerpac 4-1/8" (105mm)Socket for 2.5" Square Drive, BSH25105

Enerpac 90mm Socket for 1.5" Square Drive, BSH1590

Enerpac 80mm Socket for 1.5" Square Drive, BSH1580

Enerpac 2-9/16" (65mm) Socket for 1.5" Square Drive, BSH1565

Enerpac 55mm Socket for 1.5" Square Drive, BSH1555

Enerpac 2-5/16" Socket for 1.5" Square Drive, BSH15231

Enerpac 2-1/4″ Socket for 1.5″ Square Drive, BSH15225

Enerpac 2-3/16" Socket for 1.5" Square Drive, BSH15219

Enerpac 1-7/8" Socket for 1.5" Square Drive, BSH15188

Enerpac 1-5/8" (41mm) Socket for 1.5" Square Drive, BSH15163

Enerpac 1-7/16" Socket for 1.5" Square Drive, BSH15144

Enerpac 3-15/16" (100mm) Socket for 1.5" Square Drive, BSH15100

Enerpac 90mm Socket for 1" Square Drive, BSH1090

Enerpac 80mm Socket for 1" Square Drive, BSH1080

Enerpac 2-9/16" (65mm) Socket for 1" Square Drive, BSH1065

Enerpac 55mm Socket for 1" Square Drive, BSH1055

Enerpac 1-13/16" Socket for 1" Square Drive, BSH1046

Enerpac 3-7/8" Socket for 1" Square Drive, BSH10388

Enerpac 3-5/8" Socket for 1" Square Drive, BSH10363

Enerpac 3-1/2" Socket for 1" Square Drive, BSH10350

Enerpac 3-3/8" Socket for 1" Square Drive, BSH10338

Enerpac 32mm Socket for 1" Square Drive, BSH1032

Enerpac 3-1/8" Socket for 1" Square Drive, BSH10313

Enerpac 3" Socket for 1" Square Drive, BSH10300

Enerpac 2-7/8" Socket for 1" Square Drive, BSH10288

Enerpac 1-1/16" (27mm) Socket for 1" Square Drive, BSH1027

Enerpac 2-5/8" Socket for 1" Square Drive, BSH10263

Enerpac 2-7/16" Socket for 1" Square Drive, BSH10244

Enerpac 2-3/8" Socket for 1" Square Drive, BSH10238

Enerpac 2-1/4" Socket for 1" Square Drive, BSH10225

Enerpac 2-1/8" Socket for 1" Square Drive, BSH10213

Enerpac 2" Socket for 1" Square Drive, BSH10200

Enerpac 1-13/16" (46mm) Socket for 3/4" Square Drive, BSH7546

Enerpac 1-1/2" Socket for 3/4" Square Drive, BSH7538

How to Choose a Square Drive Torque Wrench Accessory

Which Reaction Accessory Is Right for the Job?

Complete the System

Cross-Referencing an Obsolete Square Drive Torque Wrench Accessory

Square Drive Torque Wrench Accessories – Frequently Asked Questions

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