Klein 603-10
$12.96 at Amazon
Check it on AmazonPrice as of Oct 24, 2026, 5:30 AM EDT
How to tighten a loose faucet base
Find the mount under your sink, then tighten it the maker’s way.
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Quick answer
Get under the sink and find what holds the faucet. Hand-tighten the big mounting nut, then snug the locking screws (Delta) or turn Moen’s installation tool with a long #2 Phillips. If it keeps working loose, use Delta’s fixes below.
First, check what’s actually loose
A faucet can feel loose in three different places, and only one of them is fixed from under the sink. Grab the faucet body right at the counter and rock it gently while you watch the base.
The whole base rocks on the counter
The mounting hardware under the deck has backed off. That’s what this page fixes.
The spout turns but the base stays put
Often that’s by design. Moen’s sheet for its 7545 and 7560 says to check that the faucet turns 60 degrees each way from center.
Only the handle wobbles
That’s the handle or cartridge, not the mount. See our faucet cartridge guide.
Water sits around the base
Moen says a leak at the handle can run down and puddle on the base plate. Run the paper towel test below first.
Before you crawl in, empty the cabinet and lay a towel on the cabinet floor. You don’t need to shut the water off to tighten a mounting nut or locking screws. If your sink has a garbage disposal or an instant hot unit, unplug it before your hands go near it.
Which mount is under your sink?
Lie on your back with a light and look up behind the sink bowl, where the faucet’s lines come through the counter. You’ll see one of four setups. Each one is tightened with a different tool.
Nut + locking screws
A wide nut on the shank with two screw heads facing down. Delta’s 9159 sheet: hand-tighten the nut, then “tighten locking screws” with a Phillips.
Nut + installation tool
A bracket and a large nut on the shank. Moen INS10444A: “Use screwdriver through hole in Installation Tool” to turn it.
Stud, washers, nut
A threaded rod beside the hoses with washers and a small nut. Kohler’s 26259K-4 sheet: “tighten the nut with tool (7).”
Nuts on the shanks
Two threaded shanks, each with its own big nut. RIDGID makes its 2017 basin wrench for “faucet fittings and retaining nuts.”
Can’t tell which one you have? Look for the model number on the faucet’s paperwork, under the spout or on the supply hoses, then download its install sheet from the maker. That sheet shows your exact hardware and the tool that came with it. Delta, Moen and Kohler all post them on their product pages.
Method 1: tighten a nut with locking screws
This is the Delta setup on faucets like the Trinsic 9159 pull-down. The big mounting nut is only snugged by hand. The two locking screws through it are tightened last to lock it in place.
- 1Line the faucet up from above
Have someone hold the faucet straight, or set it straight and check it after each turn. The gasket sits in a groove under the base.
- 2Snug the nut by hand
Delta’s sheet says to tighten the washer and mounting nut “securely by hand.” Spin it up until it stops.
- 3Turn both locking screws
With a Phillips screwdriver, tighten the two locking screws a little at a time, back and forth, so the nut stays level.
- 4Check from above
Rock the faucet again. If it’s solid, you’re done. If the nut spins with the screws, loosen them, retighten the nut by hand, and go again.
Delta’s sheet 63652 (Rev. B) lists a 1 3/8 in. hole, plus or minus 1/4 in., and a deck up to 3 in. thick. For thin gauge sinks, which Delta says it doesn’t recommend, it calls for the RP37490 thin deck aid. We couldn’t find a genuine Delta RP37490 on Amazon, only look-alikes, so order it from Delta.
Method 2: turn the nut with the maker’s tool
Moen’s kitchen and bathroom faucets use a big mounting nut that you can’t reach with a normal wrench. Moen packs an installation tool for it, and its kitchen sheets INS10444A, INS10601B and INS10205C turn that tool with a screwdriver.
- 1Find the installation tool
Moen sheets like INS10601B list it as “Installation Tool” in the parts list. Check the box the faucet came in.
- 2Slide it up onto the nut
Fit the tool over the hoses and up onto the mounting nut, per INS10601B.
- 3Put a screwdriver through the hole
Push a screwdriver through the hole in the tool and turn it like a handle. INS10444A says to “tighten firmly.”
- 4Check the bracket
On models 7545 and 7560, Moen flips the bracket by deck thickness: option A under 1-1/2 in., option B over. Moen’s bath sheet INS10698A turns the nut over for decks thicker or thinner than 1 in.
- 5Test the swing
From above, check the faucet sits square. On the 7545 and 7560, Moen says it should turn 60 degrees each way from center.
Lost the tool? Moen sells parts through Moen.com and 1-800-BUY-MOEN. A deep socket won’t always fit, because the hoses run up through the middle of the nut. That’s why Klein’s 68098 below has a hollow center that slides over supply hoses.
Method 3: tighten a stud and nut
Some faucets, like Kohler’s 26259K-4 touchless swing faucet, hold on with a threaded stud that screws into the faucet body. The stud runs down beside the hoses instead of around them.
- 1Check the washer order
Kohler’s sheet puts the washers on the stud with the rubber washer on top, then the nut. If they’re out of order, back the nut off and restack them.
- 2Set the faucet from above
Kohler says to adjust the faucet position before the final tightening.
- 3Tighten with the tool
Kohler’s step reads: “tighten the nut with tool (7) to secure the faucet.”
- 4Don’t touch the valve box hose
Kohler says to tighten the outlet hose connector by hand and not to use pliers or a wrench.
Method 4: tighten nuts on the shanks
Two-handle faucets and many older ones are held by a big nut on each threaded shank. These sit high up behind the bowl, which is exactly what a basin wrench was made for.
- 1Set the jaws to tighten
Flip the jaw head so the jaws bite when you turn the nut clockwise as you look up at it from below. The shank points down at you, so the usual righty-tighty rule holds from under the sink.
- 2Hook the nut
Raise the wrench and close the jaws on the nut. RIDGID’s tension plug holds the head at any angle up to 90 degrees.
- 3Ratchet it up
Turn the T-handle a quarter turn at a time. The spring-loaded jaws let it ratchet back without coming off.
- 4Alternate the two nuts
Snug one shank, then the other, and check the faucet sits square before the last turn on each.
Some faucets use plastic nuts with wings, called tab nuts, instead of metal ones. Klein’s 68098 has a tab wrench sized for 2-, 3-, 4- and 6-tab nuts, so you turn them by the wings instead of squeezing the plastic.
The tools that do it
You may already own the right tool. Match it to your mount from the drawing above. Each listing was a genuine branded tool, new and sold by Amazon.com, when we checked on Oct 20 and again Oct 21, 2026.
Klein 68098
$29.98 at Amazon
Check it on AmazonPrice as of Oct 24, 2026, 5:30 AM EDT
RIDGID 2017 LED
$71.59 at Amazon
Check it on AmazonPrice as of Oct 24, 2026, 5:30 AM EDT
RIDGID 1019
$60.99 at Amazon
Check it on AmazonPrice as of Oct 24, 2026, 5:30 AM EDT · low stock then
RIDGID 1017
$44.95 at Amazon
Check it on AmazonPrice as of Oct 24, 2026, 5:30 AM EDT
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
| Tool | Key specs | Pick it if | Skip it if |
|---|---|---|---|
| Klein 603-10 | #2 Phillips, 10 in. round shank, 14.313 in. overall, 5.6 oz, Non-magnetic, Cushion-Grip handle | Your faucet has Delta-style locking screws or a Moen-style installation tool, and your screwdrivers are too short to reach. | You already own a long #2 Phillips, or your faucet is held by big nuts on the shanks. |
| Klein 68098 | 10.9 to 14.5 in. long, 8 in. handle, 1.1 lb, 3/8 in. square drive, Reversible, Glass-filled nylon | Your faucet uses plastic tab nuts or a hex nut with the hoses running through it, or you want one tool for faucet and toilet supply work. | You’re facing a seized metal shank nut. A steel basin wrench grips harder. |
| RIDGID 2017 LED | 1/2 to 1¼ in. (12 to 32 mm), Telescoping, 2.5 lb, LED light, 3/8 in. drive adapter, Replaceable batteries | Your faucet is held by big nuts on the shanks, up behind the bowl where you can’t see, and the nuts measure 1¼ in. or less. | Your faucet uses locking screws or a maker’s installation tool, or the nut is over 1¼ in. |
| RIDGID 1019 or 1017 | 1019: 1¼ to 2½ in., 1017: 3/8 to 1¼ in., 10 to 17 in., 2 lb each, Spring-loaded jaws, Tension plug head | You know your nut size. Get the 1019 for nuts from 1¼ to 2½ in. and the 1017 for nuts from 3/8 to 1¼ in. | You can’t see the nut and want a light on the jaws. The 2017 has one. |
Which tool for which mount
One look at the hardware tells you which tool to grab. Here’s the match, with the size each tool covers.
| Tool | Photo | Mount it fits | Size it covers | Buy |
|---|---|---|---|---|
| Klein 603-10 | | Locking screws; Moen’s installation tool | #2 Phillips, 10 in. shank | Check it on Amazon |
| Klein 68098 | | Tab nuts; hex nuts around hoses | Tabs 2, 3, 4, 6; hex 5/8 to 15/16 in. | Check it on Amazon |
| RIDGID 2017 LED | | Shank nuts you can’t see | 1/2 to 1¼ in. | Check it on Amazon |
| RIDGID 1017 | | Smaller shank nuts | 3/8 to 1¼ in. | Check it on Amazon |
| RIDGID 1019 | | Larger shank nuts | 1¼ to 2½ in. | Check it on Amazon |
| Your mount | Use what you have | Buy only if |
|---|---|---|
| Nut + locking screws | Any #2 Phillips that reaches | Yours is too short to reach the screws |
| Nut + Moen tool | The tool from the box and a screwdriver | The tool is lost; order it from Moen |
| Stud, washers, nut | The tool from the box | The tool is lost; ask the maker for the part |
| Plastic tab nuts | Your fingers, if they grip | You can’t get a grip; the Klein 68098 has a tab wrench |
| Metal shank nuts | An old basin wrench, if it fits | You need a basin wrench sized to the nut |
Sizes from Klein’s and RIDGID’s product pages, read Oct 20, 2026. Measure your nut across the flats before you buy a basin wrench.
Why it keeps coming loose, and the fix for each
If you tighten it and it’s wobbly again in a month, something is letting it move. Delta’s support article on loose kitchen faucets lists four causes, each with its own fix.
| Cause | How to tell | Delta’s fix |
|---|---|---|
| Thin stainless sink flexes | The sink deck itself bends when you push the faucet | Add the RP37490 stabilization plate to stiffen and thicken the deck |
| Slick stone or glazed porcelain | The bracket slides on a smooth underside | Fold emery or plumbers cloth, grit out on both sides, between bracket and counter |
| Nothing locks the nut | The nut has turned back on its own | Add a second mounting nut under the first to lock it |
| Bracket upside down | The flat side faces up against the sink | Turn it so the edged side faces the sink and compresses when tightened |
From Delta’s support article “How can I troubleshoot a loose kitchen faucet?” (Feb 12, 2025) and its FAQ on single-handle kitchen faucets that keep loosening, read Oct 20, 2026. Delta’s FAQ adds that a bracket can loosen over time on a smooth sink.
Delta’s emery cloth trick is a good first try. Back the bracket off, slide a folded strip in with the grit facing both the counter and the bracket, then retighten. The grit gives the bracket something to bite on that polished granite or porcelain doesn’t.
Leak or loose? Moen’s paper towel test
Water on the counter around a wobbly faucet makes the mount look guilty. Moen’s support page for kitchen faucets says to rule out the handle first, because a handle leak drips straight onto the base plate.
- 1Dry everything
Wipe the faucet, the base plate and the counter around it dry.
- 2Wrap the handle
Wrap a dry paper towel around the handle, as Moen describes.
- 3Run the faucet
Turn the water on and let it run for a bit.
- 4Read the towel
If the towel is wet, the water is coming from the handle. Tightening the base won’t stop it.
| Moen faucet type | What Moen says to fix for a base leak |
|---|---|
| One handle with a side spray | O-rings and the diverter |
| One handle, no side spray | O-rings |
| Two handles | O-rings |
| Pullout wand | Check the spray wand and hose connection is tight |
| Pulldown | Contact Moen |
From Moen’s support article “Kitchen Faucet: Leaking Around The Base,” updated Apr 14, 2025. Moen says these parts aren’t sold at home centers; it sells them through Moen.com and 1-800-BUY-MOEN.
Leave the supply nuts alone unless they leak
While you’re under there, it’s tempting to crank on every nut you see. The makers say not to. Delta’s sheet puts DO NOT OVERTIGHTEN in capitals.
| Maker and sheet | Connection | What it says |
|---|---|---|
| Delta 63652 (9159) | Faucet tube to supply valve, 3/8 in. compression | Hand tight, then one more turn with a wrench. Do not overtighten. |
| Delta 63652 (9159) | All water line connections | No pipe dope or other sealants |
| Kohler 1439198 (26259K-4) | Outlet hose to valve box | Hand tighten. No pliers or wrench. |
| Moen INS10444A | Spray wand to pulldown hose | Finger tighten |
If a supply nut does drip after you’ve bumped it, our compression fitting leak guide covers that fix. If the old hoses look kinked or rusty, swap them for new ones from our braided supply line guide while the cabinet is empty.
When to replace the faucet instead
A loose base is almost always a hardware fix. A few things point to a new faucet, and one safety point applies if you’re shopping for one.
Hardware is all there
Tighten it with the methods above. That’s the usual fix.
Shank threads are stripped
If the nut spins and won’t climb, the threads are gone. The faucet body or shank has to be replaced.
Faucet leaks and wobbles
If the handle also leaks and the parts aren’t sold anymore, a new faucet may cost less in time. Our faucet install guide walks through it.
Recalled no-name faucets
On May 29, 2025, the CPSC announced recalls of BASDEHEN, KICIMPRO and VFAUOSIT kitchen faucets sold on Amazon.com for lead exposure to young children. If yours is one of them, stop using it and follow the CPSC notice for the remedy.
If you replace it, choose a faucet whose maker publishes its install sheet and its drinking water certifications. Our kitchen faucet and bathroom faucet guides compare models from Moen, Delta and other makers on exactly that.
When to call a licensed plumber
The cabinet floor is soft or stained
That’s an old leak. A plumber can find the source before it rots the cabinet.
The shutoff valves won’t close
If you need the water off and the angle stops are stuck, have them replaced.
The sink or counter itself moves
Loose sink clips or a cracked deck need a plumber or countertop installer, not a tighter nut.
Water near the disposal wiring
Unplug the disposal and leave the wiring to a licensed electrician if water has reached it.
Questions people ask
Why does my faucet keep getting loose?
Delta lists four causes: a thin stainless sink that flexes, a slick stone or porcelain underside that the bracket slides on, a single nut with nothing locking it, and a bracket installed upside down. Each has its own fix in the table above.
What tool can I use to tighten a faucet under my kitchen sink?
It depends on the mount. Delta’s locking screws need a Phillips screwdriver, Moen’s mounting nut takes its installation tool and a screwdriver, and big nuts on the shanks need a basin wrench.
Do you need a special tool to tighten a sink faucet?
Often not. Many single-hole faucets come with their own tool or use screws a long #2 Phillips can reach. A basin wrench is the special tool, for nuts you can’t get a hand around.
How do you make a faucet stay in place?
Tighten the nut by hand, then the locking screws or tool. If it loosens again, Delta suggests emery or plumbers cloth between the bracket and counter, a second nut to lock the first, the RP37490 plate on a thin sink, and checking the bracket isn’t upside down.
How do you tighten a bathroom sink faucet from underneath?
Moen’s lavatory sheet INS10698A has you thread the mounting nut onto the stud, turned the right way for your deck thickness (over or under 1 in.), slide the installation tool onto it and turn it with a screwdriver.
Should I tighten the supply lines too?
Not unless they leak. Delta says hand tight, then one more turn with a wrench, and do not overtighten. It also says not to use pipe dope or other sealants on those connections.
Is my loose faucet base causing the leak?
Maybe not. Moen says a leak at the handle can run down and puddle on the base plate. Wrap a paper towel around the handle and run the water. A wet towel points to the handle.
Which way do I turn the nut from under the sink?
Looking up at the mounting nut from below, turn it clockwise to tighten. The shank points down at you, so the usual righty-tighty rule holds from under the sink.
Can I use plumber’s putty to stop the wobble?
Delta’s fix for a bracket that slips is emery or plumbers cloth, grit facing out, between the bracket and the counter. Its 9159 seals the base with a gasket in a groove, so check your faucet’s sheet before you add any putty.
What if the faucet still moves after tightening?
Check that it’s the base moving and not a spout made to swivel, then work through Delta’s four fixes. If the sink itself flexes or the counter is cracked, call a plumber or countertop installer.
How we wrote this guide
Why trust us
Isaac Daniels, a licensed journeyman plumber in Georgia (license #JP507711), owns PlumbingPicks and is responsible for this page. Every step comes from the faucet makers’ own install sheets and support articles, read the same night we checked the tool listings.
How we pick
- Steps from Delta, Moen and Kohler install sheets and support pages, read Oct 20, 2026, and quoted where the wording matters.
- Tools matched to the mount each maker’s sheet describes, with sizes from Klein’s and RIDGID’s product pages.
- The tools are listed as one kit with no shared score, because the right tool depends on the hardware under your sink.
- Every listing checked as a genuine branded tool, new and in stock, through Amazon’s Creators API on Oct 20 and again Oct 21, 2026.
- Delta’s RP37490 plate is named but not linked: we found only third-party look-alikes on Amazon.
- CPSC recall search for basin wrenches (none) and faucets (three no-name kitchen faucet recalls, noted above).
Sources
- Delta Faucet install sheet 63652 Rev. B, models 9159-DST and 9959-DST: hole and deck size, mounting nut and locking screws, RP37490 thin deck aid, supply connection rule, no pipe dope. deltafaucet.com, read Oct 20, 2026.
- Delta Faucet support article “How can I troubleshoot a loose kitchen faucet?” (Feb 12, 2025) and FAQ on single-handle kitchen faucets that keep loosening. support.deltafaucet.com and deltafaucet.com, read Oct 20, 2026.
- Moen installation sheets INS10444A (4/18), INS10601B (2/18), INS10205C (4/18), INS10117B (3/16), INS10698A (9/18) and INS10662B (7/19): mounting nut, bracket, installation tool, deck thickness, 60 degree swing. moen.com, read Oct 20, 2026.
- Moen support article “Kitchen Faucet: Leaking Around The Base” (updated Apr 14, 2025): paper towel test, base leak parts by faucet type, where parts are sold. solutions.moen.com, read Oct 20, 2026.
- Kohler installation guide 1439198-H2, 26259K-4: mounting stud, washer order, tool (7), outlet hose hand tight. kohler.com, read Oct 20, 2026.
- RIDGID basin wrenches page and 2017 telescoping basin wrench page: capacities, lengths, weights, jaws, tension plug, LED, T-handle, warranty. ridgid.com, read Oct 20, 2026.
- Klein Tools 68098 12-in-1 faucet wrench and 603-10 #2 Phillips screwdriver product pages: sizes, materials, features and warnings. kleintools.com, read Oct 20, 2026.
- CPSC recall notices, May 29, 2025: BASDEHEN, KICIMPRO and VFAUOSIT kitchen faucets sold on Amazon.com. cpsc.gov, searched Oct 20, 2026.
- Amazon listings for all five tools (seller, condition, stock): read through the Creators API, Oct 20, 2026, 12:59 AM EDT, and again Oct 21, 2026.
- Semrush keyword data, Google Search Console data for this page and the live Google results page: Oct 20, 2026.