FAQ
TL;DR: Stuck sink strainer? Cutting between basket holes takes up to 5 minutes, and "I advise against tapping anything" on fragile sinks. For DIYers dealing with seized strainer screws, this covers non-destructive and destructive fixes that actually work. [Elektroda, kot mirmur, #18288044]
Why it matters: Pick the right method to avoid cracking the sink and wasting hours on a screw that won’t budge.
Quick Facts
- Non-destructive try: spray WD‑40 every hour and attempt to unscrew the next day for best chance. [Elektroda, vielleicht, post #18274482]
- Drill-out path many pros use: start with a 4 mm bit, then an 8 mm through the head. [Elektroda, Cowboy zagrabie, #18288031]
- After ~4 years of service, plan to replace the whole set rather than fight the screw. [Elektroda, Cowboy zagrabie, #18288031]
- Top-side cut between strainer holes is quick—operation time up to 5 minutes. [Elektroda, kot mirmur, #18288044]
- Root cause of seizure: hidden steel nut embedded in plastic; visible screw is often brass/stainless. [Elektroda, r103, post #18288847]
How do I loosen a stuck sink strainer screw without destroying it?
Use a penetrant and patience. “Patiently and systematically spray WD‑40 every hour and try to unscrew the next day.” How‑To: 1. Flood the screw head and threads with WD‑40. 2. Reapply hourly to keep it wet. 3. Next day, use a well‑fitting screwdriver and steady pressure. [Elektroda, vielleicht, post #18274482]
What’s the quickest destructive method that avoids cracking the sink?
Cut the screw from underneath along with the siphon tube. Modern setups allow an angle grinder cut. Then fit a new siphon and strainer during reassembly. This bypasses frozen threads and brittle plastics near the bowl. [Elektroda, r103, post #18274497]
Can gentle hammer taps help free the screw?
Yes—controlled impact can break corrosion. Lightly tap the screw via a stout screwdriver seated in the slot. Then use gentle hammer blows to turn, not brute force. Expert tip: “Nothing by force, just a hammer.” [Elektroda, Marian B, #18287987]
When should I avoid tapping the screw head?
Avoid tapping if the sink may have hidden micro‑cracks. Impact can propagate a crack and damage the bowl. The safer path is cutting per the invasive methods described. “I advise against tapping anything” on fragile sinks. [Elektroda, kot mirmur, #18288044]
How do I drill out the seized screw from the top?
Drill the head: first 4 mm, then 8 mm to release the clamp. This is faster than struggling and avoids slot damage. After about 4 years of use, bring a new set and plan to replace during reassembly. [Elektroda, Cowboy zagrabie, #18288031]
Should I start from below and spin the drain tube?
Yes. Start turning the tube from the bottom to break the assembly’s grip. This can relieve tension on the screw and make removal possible. It’s a quick first check before drilling or cutting. [Elektroda, Tommy82, post #18274670]
Why do these strainer screws seize so badly?
The visible screw is often brass or stainless, but it threads into a steel nut embedded in plastic. That hidden steel corrodes and locks the assembly, causing the notorious “constipation.” [Elektroda, r103, post #18288847]
Did WD‑40 work for the original poster?
No. The OP reported WD‑40 “could not cope,” so they cut the assembly instead. Cutting resolved the issue promptly when time was tight. [Elektroda, diabeel, post #18293475]
Replace just the strainer, or the whole siphon/trap?
Replace the whole siphon assembly, not just the strainer. After disassembly, gaskets are worn and appearances suffer, so a full swap saves callbacks and leaks. [Elektroda, r103, post #18274497]
How can I get more torque without stripping the slot?
Use a properly sized locksmith’s screwdriver and slip a ring spanner over its shaft. Press firmly down to keep engagement, then turn the key. “Either you twist or you twist it.” A helper improves control. [Elektroda, ak44, post #18289165]
Can I cut the basket from the top with basic hand tools?
Yes. Use good side‑cutting pliers or narrow‑tip scissors to cut between the strainer holes. This invasive method is fast—operation time up to 5 minutes. [Elektroda, kot mirmur, #18288044]
What if the screwdriver slot is already ruined?
Stop teasing the head. Ream the head or cut the assembly and replace with a new kit. One user solved it by cutting after several failed attempts; a longer bolt can be tried on reassembly. [Elektroda, keseszel, post #18289221]
Is non‑destructive removal realistic after several years?
Often not. Expect that after a few years, you won’t unscrew the bolt without cutting. Plan for replacement to save time. [Elektroda, karolark, post #18288019]
When should I call a plumber?
If cutting tools or drilling feel out of scope, or the sink is delicate, call a pro. As one member quipped, “now you have to call a specialist.” [Elektroda, kot mirmur, #18288920]
