For standard no-hub cast-iron couplings, the RIDGID 902 (catalog 31410) is the 5/16-inch preset wrench that clicks at 60 inch-pounds. For heavy-duty couplings rated at 80 inch-pounds, RIDGID’s 904 (catalog 14988) has a 3/8-inch drive. For other plumbing fasteners with a published inch-pound spec, the TEKTON TRQ50402 is an adjustable 1/4-inch-drive wrench reading 20 to 200 inch-pounds. The coupling maker’s instructions set the torque, not the tool.
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Preset, range, measuring direction and socket fit are separate checks. One tool is not automatically right for every coupling or plumbing fastener.
Preset no-hub tool or adjustable torque wrench?
| Tool | Maker specification | Consider for | Main limit |
|---|---|---|---|
| RIDGID 902 / 31410 | Preset 60 in-lb; 5/16-inch hex drive | Compatible no-hub coupling instructions | Preset and head size must both match |
| TEKTON TRQ50402 | 20–200 in-lb; 1/4-inch square drive | Adjustable torque with suitable accessories | Specification must fall within its range |
The hex size of the no-hub tool and the square-drive size of the adjustable wrench describe different interfaces. Neither number alone tells you the required torque.
RIDGID 902: a specific no-hub preset
Consider model 902, catalog 31410, when the coupling instructions require its preset and its hex drive fits the screw. The current RIDGID US page (ridgid.com) specifies a 5/16-inch drive and 60 inch-pounds.
The checked standard new Amazon.com offer showed stock with model 902 and manufacturer part number 31410. Those are complementary identifiers, not a mismatch.
Skip it when the coupling calls for another torque or screw-head size. A preset tool cannot choose the correct specification for you.
RIDGID’s separate model 904, catalog 14988, has a 3/8-inch drive and 80-inch-pound preset. Do not assume choosing a higher preset also provides the same hex size. A different coupling may need another combination. Check the RIDGID 904 (14988) on Amazon.
Check RIDGID 902 / 31410 no-hub torque wrench on Amazon →
TEKTON TRQ50402: an adjustable inch-pound choice
Consider TRQ50402 when the required specification is within its 20–200 inch-pound range and you can fit the appropriate socket or bit. Its current maker page (tekton.com) identifies a 1/4-inch square drive, mechanical click and measurement in both directions.
The current model includes a serialized calibration certificate and a case. TEKTON states accuracy within ±3% clockwise and counterclockwise; that is a maker specification, not a result we measured.
The checked standard new Amazon.com offer showed stock and exact model/part number TRQ50402. It is distinct from the discontinued 24320 and TRQ21101 models.
Skip it when the target falls outside its range, access prevents proper operation or the work requires another approved tool. An adjustable scale is useful only after the equipment or fastener instructions supply a legitimate target.
Check TEKTON TRQ50402 inch-pound torque wrench on Amazon →
The coupling maker sets the target
No-hub does not mean one universal torque. Fernco’s current US no-hub page (fernco.com) distinguishes standard, medium and heavy-duty families, and identifies exceptions within the standard family.
Its medium-duty and heavy-duty examples also use different hex-head sizes despite sharing a listed torque. That shows why torque and socket fit must be checked separately.
Read the exact coupling model, size and current installation instructions. Do not transfer a wrench’s preset to another coupling merely because both products are described as no-hub tools or fittings.
Our coupling comparison covers the separate connection choice. The wrench purchase does not establish pipe-material compatibility, coupling approval or the required installation sequence.
Keep inch-pounds and foot-pounds distinct
Check the unit in the installation specification and the unit on the wrench. One foot-pound equals twelve inch-pounds. Confusing them can create a large setting error.
Do not treat all foot-pound wrenches as unsuitable for plumbing. Some plumbing work may legitimately require them. The correct choice is a tool whose range, accuracy and access suit the actual specified task.
For low inch-pound work, a large wrench may not include the required value in its stated measuring range. A conversion on paper does not expand that range.
Record the target with its unit rather than writing a bare number on a work note. If you convert a value, retain the original specification beside the conversion so another person can check it.
A torque wrench does not supply a missing specification
Do not invent a torque for toilet mounting bolts, a flange or a union simply because a wrench has an inch-pound scale. The correct procedure depends on the actual assembly and its maker.
Some instructions specify a sequence, gasket condition, approved lubricant or another installation detail along with a torque. Preserve those conditions when choosing the method and tool.
A numerical target copied from a different fitting may produce a precise reading for the wrong assembly. Start with the correct documentation, then select the wrench.
If the instruction is unclear or does not specify torque, resolve the intended installation method. Buying a measuring instrument does not turn an unsupported number into an approved procedure.
Square drive, socket fit and offsets need separate checks
The TRQ50402 uses a square drive and requires a suitable accessory to engage the fastener. Verify the socket or bit size, retention and room around the head.
Do not confuse the wrench’s drive size with the nut’s wrench size. A 1/4-inch square drive can accept different sockets; the socket opening still has to match the fastener.
The current TEKTON manual (media.tekton.com) explains that off-axis accessories can change effective length and require a correction. Do not apply the same setting blindly after adding a crowfoot or another offset.
Use the maker’s actual geometry and instructions for that setup. This guide does not provide a universal correction formula or assume an accessory leaves the effective length unchanged.
A click is a signal, not permission to keep pulling
For the TEKTON micrometer wrench, the manual calls for a slow, controlled pull and stopping when the click is heard or felt. Continuing to pull can overtighten the fastener.
Follow the exact model’s grip position and operation. A longer lever added to the handle is not a shortcut to a correct measurement.
Ratchet direction and measuring direction are different features. This selected current TEKTON model measures both ways, but that capability should not be assumed for every reversible ratchet wrench.
An impact driver or ordinary ratchet serves another role. It does not verify final torque merely because it can turn the same socket.
Calibration, storage and replacement models matter
TEKTON’s manual directs storage at the lowest printed setting and checking accuracy after a drop or damage. Follow that model’s requirements rather than assuming every torque-wrench design stores the same way.
The current TEKTON resources page (tekton.com) separates current manuals from discontinued models. Do not apply an old model’s accuracy or included-certificate description to a replacement with a similar range.
If the job needs calibration records, confirm that the received certificate matches the tool and satisfies the job’s requirements. A calibration certificate is not a permanent guarantee against later damage or misuse.
TEKTON also lists a recertification service (tekton.com). Verify current eligibility and requirements directly; this guide does not promise a free service or prescribe a universal recertification interval.
Build the kit around documented work
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Make a short list of the assemblies you actually install and the tools their instructions require. Group the entries by torque range, unit, measuring direction and fastener interface.
A preset no-hub tool may cover a repeatable, matching task. An adjustable wrench may serve several documented targets. Neither automatically makes the other unnecessary.
Keep sockets and other accessories identifiable, and leave enough working space to operate the wrench as intended. If the installation prevents that, resolve access or use the method approved for the assembly.
Our lag-screw guide addresses a separate fastening decision. The existence of a torque wrench does not establish a generic tightening value for every support or anchor.
Frequently asked questions
Are all no-hub couplings tightened to 60 inch-pounds?
No. Check the exact coupling family, size and current maker instructions; there are other specifications and exceptions.
What is the RIDGID 31410 model number?
The current maker ordering table maps catalog 31410 to model 902, with a 5/16-inch drive and 60-inch-pound preset.
Does 1/4-inch square drive mean a 1/4-inch nut size?
No. Square-drive size and the socket opening that fits the fastener are separate dimensions.
Does the TEKTON TRQ50402 measure both directions?
The current maker page specifies clockwise and counterclockwise measurement for this exact model.
Should I keep pulling after the TEKTON wrench clicks?
No. Its manual says to stop applying torque when the click is heard or felt; continuing can overtighten the fastener.
How we chose
We compared the current RIDGID US ordering table, current TEKTON TRQ50402 page and manual, and Fernco’s current US no-hub family guidance. Both physical sheets of the current TEKTON manual were visually checked, including the model table and offset diagrams. Standard new Amazon.com offers matched both selected identities and showed stock on October 14, 2026. This is a source comparison, not a calibration, leak or installation test. Read our selection method and about Plumbing Picks.
Primary sources
- RIDGID current US torque-wrench page (ridgid.com): 902/31410 and 904/14988 drive/preset distinctions.
- TEKTON current TRQ50402 page (tekton.com): range, direction and maker-stated current certificate/accuracy.
- TEKTON current linked micrometer manual (media.tekton.com): model table, click operation, offsets and storage; visually checked.
- Fernco current US no-hub page (fernco.com): exact family/size differences, not a universal tightening recipe.
- TEKTON current torque resources (tekton.com): current versus discontinued models.
- TEKTON current recertification page (tekton.com): separate service eligibility, no cost or interval promise.