QfwdfcTrenz 30 Pcs Multi Purpose Rubber Spacer 5 Sizes Spacers Thick Washer Rubber Bushings Washers for Screws Anti Vibration Spacer Bushings Flat Washer

Why I reached for this rubber spacer set

Small rubber parts are the kind of thing you don’t think about until you need them right now. A rattle in a cabinet door, a wobbly appliance, a bolt that needs a touch of cushioning—these problems all beg for the same solution: a handful of well-sized rubber spacers. I’ve been keeping this QfwdfcTrenz rubber spacer set in my shop for a few weeks, and it’s become the little kit I pull out whenever I need to quiet vibration, add a compliant standoff, or create a quick seal.

What’s in the box

You get 30 neoprene spacers in five sizes, six of each, organized in a compact storage box. The dimensions (outer diameter × inner diameter × height) are:

• 12 × 6 × 10 mm
  
• 18 × 6 × 5 mm
  
• 20 × 10 × 15 mm
  
• 25 × 8 × 7 mm
  
• 30 × 10 × 15 mm

That translates to inner diameters sized for roughly M6, M8, and M10 bolts (or comparable screws/tubing), with heights from 5 mm to 15 mm. The assortment covers most household tasks that call for spacing, isolation, or soft mounting.

The box is simple but does the job: separate compartments keep sizes sorted, and it’s small enough to live in a drawer or tool bag. I haven’t had it mix compartments or pop open in transit.

Material and build quality

The spacers are made of neoprene, a good general-purpose rubber: resilient, reasonably heat/cold resistant, and tear-resistant for day-to-day use. In hand, the material feels medium-firm—compliant enough to compress under finger pressure but not so soft that it pancakes under a bolt. Edges are cleanly cut with minimal flashing, and the inner bores are true; I didn’t run into off-center holes or out-of-round pieces.

There’s a faint rubber smell out of the box that dissipated after a day. No residue or bloom on the surface. Compress-and-release behavior is consistent across the sizes; they rebound well without permanent deformation after moderate compression.

Fit and sizing in practice

I tested the M6-size bores (6 mm) with both metric M6 bolts and #12 wood screws, the 8 mm with M8 hardware, and the 10 mm with M10 and miscellaneous tubing stubs. Here’s what stood out:

• The 18 × 6 × 5 mm size is the most “washer-like” in profile. It’s ideal when you need just a bit of cushion or to prevent metal-on-metal contact without adding much height.
• The taller 20 × 10 × 15 mm and 30 × 10 × 15 mm spacers act as proper bushings. They’re great for isolating a bracket or bridging a gap while damping vibration.
• Tolerances are sensible for rubber: M6 and M8 hardware passes through without fight, and there’s enough friction for a snug seat once compressed, especially with the 6 mm ID pieces. The 10 mm ID sizes are better as sleeves over tubing or as standoffs around larger bolts; they don’t “grip” as tightly by design.

If you need precision standoff heights in the sub-5 mm range, this set won’t replace rigid shims. For more height than 15 mm, stacking works, but expect extra compliance under load.

In use: vibration, sealing, and anti-slip

• Appliance and furniture damping: I slipped the 25 × 8 × 7 mm spacers under a lightly vibrating utility shelf leg (with a screw foot) and under a metal toolbox handle that buzzed at certain RPMs. In both cases, the buzzing dropped to a dull thrum. On the shelf, the rubber minimized walking on a tile floor; it’s not a miracle for wildly unlevel surfaces, but it adds grip and quiets the contact points.

• Bracket isolation: Mounting a small fan to a plywood panel with the 12 × 6 × 10 mm spacers as soft bushings noticeably cut transmitted noise. The 10 mm height is a nice midpoint—enough decoupling without wobble if you don’t overtighten. I also mounted a light-duty pump on a bracket using the 20 × 10 × 15 mm spacers; the extra height created a compliant gap that kept the chassis from singing.

• Light sealing and leak prevention: The 18 × 6 × 5 mm spacers worked as sacrificial cushions on a shower arm trim and as a gasket behind a metal escutcheon where the original foam had deteriorated. For low-pressure, splash-level sealing, they compress uniformly and don’t squirm out. I wouldn’t use them inside pressurized plumbing unions or where a purpose-made flat washer/gasket is required; these are general-purpose spacers, not certified plumbing seals.

• Tool and handle comfort: Sliding a 10 mm ID spacer over a narrow handle created a small, compliant grip zone. It’s a quick hack—think a dampening collar rather than a full grip—but it makes thin metal handles less fatiguing.

Durability and environmental resistance

Neoprene is a practical compromise: more oil and weather resistant than natural rubber, not as UV-stable as EPDM, and not as heat-tolerant as silicone. In my tests:

• Temperature: Near a radiator and in a cold garage, the spacers stayed pliable. No surface cracking or hardening after a few weeks. I wouldn’t push them against sustained high heat or direct flame, but for household ranges they hold up.

• Compression set: After a month under moderate bolt preload, a spacer retained most of its thickness and spring. There’s a minor set (normal for rubber), but not enough to loosen hardware if you torque appropriately.

• Tear resistance: Cutting and trimming with a sharp utility blade was straightforward; no ragged tears when the blade was fresh. In use, edges didn’t crumble under load or shear.

Outdoors, I’d expect them to last a season or more in indirect sun. For long-term UV exposure, I’d reach for EPDM.

Where this set shines

• Quick fixes: Stop a rattle, add grip under a leg, decouple a bracket—no shopping trip required.
• Mixed hardware environments: M6, M8, and M10 coverage hits common sizes for home, shop, and light automotive tasks.
• Clean, predictable compression: They squish evenly and don’t spit out under moderate torque, which makes them reliable for “install and forget” jobs.

Where it falls short

• Limited inner diameters: If you work a lot with M4 or M5, you’ll find gaps in this kit. The small end starts at 6 mm ID.
• Not a substitute for dedicated gaskets: For pressurized plumbing or fuel systems, use the right rated washer/gasket. These are generalists.
• Height jumps: 5, 7, 10, and 15 mm heights cover many tasks, but if you need precise standoff increments, you’ll either stack or trim.

Tips for best results

• Don’t overtighten: Rubber needs a touch of preload to stay put, but cranking down defeats the damping and can cause creep.
• Stack with sense: If you must stack, align bores and use a large washer to distribute force over the top spacer. Expect more compliance.
• Trim cleanly: A sharp utility knife and a miter box or simple guide block give straight cuts if you need custom heights.
• Pair with flat washers: On softer materials (wood, plastic), add a metal washer against the rubber to prevent the bolt head or nut from biting in.

The bottom line

This rubber spacer set earns a place in a general-purpose kit. The assortment is well-chosen, the neoprene feels durable for everyday tasks, and the sizes cover the most common use cases I run into at home and in the shop. I appreciate that the 5 mm and 7 mm heights handle low-profile cushioning, while the 10 mm and 15 mm pieces act as honest bushings when you need more isolation or standoff. The storage box keeps it all tidy, and the pieces are consistently made.

It’s not the right solution for high-pressure sealing, continuous high-heat exposure, or long-term outdoor UV. And if you need smaller inner diameters or very specific heights, you’ll want a different assortment or dedicated spacers. But for quieting vibrations, preventing metal-on-metal contact, adding slip resistance, and solving everyday spacing problems without fuss, this set performs exactly as I’d hope.

Recommendation: I recommend this set to anyone who wants a dependable, grab-and-go assortment of rubber spacers for household, light workshop, and hobby use. The combination of practical sizes, consistent neoprene quality, and the convenience of having six of each size makes it a versatile, low-maintenance addition to a toolbox.