The best tank-to-bowl bolts depend on your toilet’s connection style and the parts you need to replace. The Fluidmaster 6101 is a straightforward brass-bolt option, while the Gerber 99-660 kit is designed for specific Gerber assemblies and includes a tank gasket. For general repairs, compare the stainless-steel kits by their stated size, washer arrangement, and included quantity before choosing.
| Product | Best For | Key Difference |
|---|---|---|
| Fluidmaster 6101 | Brass bolts for broad brand fit | Solid-brass bolts, washers, and nuts |
| Lovppy Universal Kit | Two short stainless-steel bolts | Rubber washers and long lock nuts |
| M6 Universal Kit | Repairs calling for M6 bolts | Stainless steel with rubber washers |
| Gerber 99-660 Kit | Listed Gerber toilet assemblies | Includes tank gasket and hardware |
| M8 Universal Kit | Repairs calling for M8 bolts | Four-piece set with double-layer gaskets |
Fluidmaster 6101 Brass Bolt Kit
The Fluidmaster 6101 is best for buyers who want a basic replacement set with brass bolts rather than a kit built around a particular toilet model. The listed contents include durable solid-brass bolts, washers, and nuts. The product is described as easy to install and as fitting all brands.
Choose this kit if your repair requires tank-to-bowl bolts and the matching washers and nuts. Its brass construction makes it a distinct option compared with the stainless-steel kits below. However, the product information does not specify bolt dimensions or a separate tank gasket. Check your toilet’s hardware requirements before ordering if you need either detail confirmed.
Lovppy Short Stainless-Steel Bolt Kit
This two-bolt kit is best for buyers seeking short stainless-steel hardware with rubber washers. The listed features describe stainless-steel bolts, nuts, and flat washers, plus waterproof rubber gaskets. Long lock nuts are intended to help stabilize the connection, while rubber washers on both sides are described as helping seal the tank-to-bowl joint.
Choose it if your toilet uses the included short-bolt format and you want a kit that combines fastening hardware with sealing washers. The manufacturer describes it as suitable for most standard toilets, not every toilet. Its “Short” configuration is an important limitation: verify the required bolt length and fit before purchase.
M6 Stainless-Steel Universal Bolt Kit
The M6 kit is best for a repair where the required bolt size is M6. Its listed features include stainless-steel bolts, rubber washers, and extra-long nuts. The description says the washers are intended to create a watertight seal and the locking nuts to help stabilize the connection. It also describes installation with a screwdriver after removing the old bolts and cleaning the area.
This is a better choice than a size-unspecified kit when you have confirmed that your toilet needs M6 hardware. The product is described as designed for most standard toilets, but that general claim does not replace checking the size and arrangement of your existing parts. Avoid choosing it based on appearance alone if your required bolt size is unknown.
Gerber 99-660 Bolt And Gasket Kit
This kit is best for owners repairing one of the Gerber assemblies named in the product information. It includes a tank gasket, two brass bolts, flat washers, retaining clips, a tapered washer, wing nuts, and a threaded nut. Brass bolts and flexible rubber gasket components are listed as part of the replacement set.
Choose this option when you need more than bolts and washers and have verified that your toilet matches the listed part references, including Gerber 99-660, 99-025, or 99-856. The added gasket and hardware make it a more complete assembly-specific replacement. Do not assume compatibility with an unlisted toilet model; confirm the toilet’s part number before ordering.
M8 Four-Piece Universal Bolt Kit
This four-piece M8 kit is best for buyers whose repair calls for M8 hardware and who want multiple bolts in one set. Its listed design includes double-layer rubber gaskets and long lock nuts. The description says the gaskets help seal connection points and the nuts help stabilize the connection. Installation is described as using a standard screwdriver.
Choose this kit over the M6 set only when M8 is the required size. The listing describes it as suitable for most common toilet brands and models, but also identifies it as M8. That size is the key limitation: confirm the required bolt diameter and check whether the kit’s quantity and washer arrangement match your repair.
Buying Guide: How To Choose Tank-To-Bowl Bolts
Which bolt material should you choose?
Compare the material listed for the bolts. The Fluidmaster kit uses solid brass, and the Gerber replacement kit also includes brass bolts. The general-purpose Lovppy, M6, and M8 options list stainless steel. Material alone does not confirm fit, so also check the required dimensions and the washers supplied.
How do you check size and compatibility?
Before ordering, inspect the existing hardware and, when possible, identify the toilet’s model or replacement-part number. Pay particular attention to the M6 and M8 labels and to the Lovppy kit’s short-bolt description. For the Gerber kit, compare your toilet’s part reference with the specific compatibility list. “Universal” descriptions typically refer to common or standard toilets, not guaranteed compatibility with every model.
Do you need bolts only or a complete gasket kit?
If the repair calls for bolts, nuts, and washers, compare the simpler hardware sets. If the tank-to-bowl gasket also needs replacement, the Gerber 99-660 kit specifically lists a tank gasket and additional assembly parts. Do not assume a bolt kit includes a separate tank gasket unless the product description says so.
What should you check during installation?
Follow the product’s installation directions and keep the washers in the specified positions. The listed kits describe screwdriver-based installation, but the exact hardware arrangement can differ. Remove the old parts and clean the connection area as appropriate. If the replacement does not align with the tank and bowl, stop and recheck the part size and model fit rather than forcing the hardware.
Frequently Asked Questions
Are tank-to-bowl bolts universal?
Some kits are marketed for most standard toilets, but fit is not guaranteed for every model. Confirm the bolt size, length, and connection style for your toilet.
Are brass or stainless-steel bolts better?
Both materials are listed for these replacement kits. Choose based on the required fit and the material you prefer; the product details do not establish one as best for every toilet.
Do tank-to-bowl bolt kits include a tank gasket?
Not necessarily. The Gerber 99-660 kit explicitly includes a tank gasket. Check the contents list for other kits before assuming one is included.
How can I tell whether I need M6 or M8 bolts?
Check the existing hardware or the toilet’s parts information for the required size. Do not infer bolt size from the appearance of a product image.