The right lawn mower engine mounting bolts depend on the engine and the part being fastened. Of these options, the SUPPLY Go Kart Engine Mount Bolt Kit is the closest match for mounting certain small engines. The other listings cover spindle, crankcase, deck-wheel, or automotive engine-stand hardware—not universal mower engine mounts. Check your mower’s parts diagram and bolt measurements before ordering.
| Product | Best suited for | Important fit detail |
|---|---|---|
| SUPPLY Go Kart Engine Mount Bolt Kit | Some 3–7 HP engines | 1 1/2-inch bolts; verify fit |
| Ganivsor Spindle Mounting Bolts | Specified MTD-family spindle repairs | 5/16″-18 x 3/4″ thread |
| Strongthium Crankcase Screws | Listed Briggs & Stratton applications | Match part numbers and engine model |
| Deck Wheel Bolt Kit | Specified mower deck-wheel repairs | Not engine mounting hardware |
| LS Engine Stand Bolt Kit | Listed automotive LS engine stands | Not for lawn mowers |
SUPPLY Go Kart Engine Mount Bolt Kit
This is the closest match in the list for a small-engine mounting job. The kit includes four sets of Grade 5 bolts and lock nuts, and the listing says it works with most 3–7 HP engines, including Predator and Tillotson engines. The bolts are listed as 1 1/2 inches long.
Best for: Buyers mounting a compatible small engine who need bolts and lock nuts together. It was selected because it is the only listing specifically described as an engine mount bolt kit. Caution: “Most” does not guarantee fit. Confirm the engine, mounting plate, thread, and required bolt length before purchase.
Ganivsor Spindle Mounting Bolts
This six-bolt replacement set is for mower spindle assemblies, not for fastening an engine to a frame. The listing identifies the bolts as replacements for MTD, Troy-Bilt, and Cub Cadet part numbers 710-1260A, 710-0650, and 710-04484. It specifies a 5/16″-18 thread and a listed length of 1 inch.
Best for: Owners repairing a spindle with one of the listed part numbers. It was included because mower hardware searches can confuse spindle mounting bolts with engine mounting bolts. Caution: Do not use these as engine bolts based on appearance alone; verify the application and dimensions.
Strongthium Briggs & Stratton Crankcase Screws
This 10-piece set is described as aftermarket crankcase screw mounting bolts, with listed replacement numbers including 694966, 690308, and 93764. The listing names Briggs & Stratton engines and several Toro, Cub Cadet, and MTD lawn tractor applications. It also provides specific engine and mower model references.
Best for: Buyers replacing crankcase screws on an engine whose model and required part number match the listing. It was selected because it is mower-engine hardware, although it is not described as a frame-to-engine mount kit. Caution: The broad compatibility list requires careful model and part-number verification.
Deck Wheel Bolt And Locknut Kit
This two-pack is described as a deck-wheel bolt and locknut kit for specified Exmark mower part numbers, including 103-3168 and 103-4051. The listing also mentions a 5/8-inch bore wheel. It is included as a related mower fastener, not as an engine mounting option.
Best for: Buyers replacing deck-wheel hardware who can confirm the listed part-number or wheel fit. Caution: This kit is not identified as engine hardware, so do not choose it for attaching a mower engine to its frame.
LS Engine Stand Bolt Kit
This 12-piece kit is listed for LS-series automotive engine stands and names engines such as LS1, 4.8L, 5.3L, 6.0L, and 6.2L. The product description does not identify lawn mower applications.
Best for: A buyer seeking the specified automotive engine-stand bolts. It was included to distinguish another product that contains “engine” and “mount” terminology from mower engine mounting hardware. Caution: Avoid this for a lawn mower; its stated application is LS engine stands.
Buying Guide: How To Choose Lawn Mower Engine Mounting Bolts
How can you identify the correct bolt?
Start with the mower’s model and engine identification numbers. Use the manufacturer’s parts diagram or parts list to identify the engine mounting hardware, then match the listed part number. If the part number is unavailable, compare the original bolt’s thread diameter, pitch, length, head style, and any required washer or lock nut.
Why does bolt length matter?
A bolt must engage the threads securely without bottoming out or protruding into moving parts. Do not assume that a bolt will fit because its length is close to the original. Account for the thickness of the engine plate and any washers when checking the required length.
Are all mower mounting bolts interchangeable?
No. Engine mount bolts, crankcase screws, spindle bolts, and deck-wheel bolts serve different locations and may have different dimensions and strength requirements. The Ganivsor and Strongthium listings describe specific mower hardware, but neither is a general engine-to-frame bolt kit.
Should you reuse old bolts?
Inspect removed bolts for damaged threads, stretching, corrosion, or rounded heads. Replace questionable hardware with the specified part or a verified equivalent. Follow the mower or engine service instructions for tightening method and torque; do not guess a torque value.
Frequently Asked Questions
What is the closest match here for lawn mower engine mounting bolts?
The SUPPLY kit is the closest match because it is specifically described as an engine mount bolt kit for most 3–7 HP engines. Confirm your engine and mounting dimensions before ordering.
Can I use spindle bolts to mount a mower engine?
No. The Ganivsor listing identifies spindle mounting bolts for specified MTD-family mower applications, not engine-to-frame mounting.
Are crankcase screws the same as engine mounting bolts?
No. Crankcase screws fasten engine crankcase components. They should not be substituted for bolts that secure the engine to a mower frame.
What should I check before buying replacement bolts?
Check the mower and engine model, part number, thread size and pitch, bolt length, and intended location. Use the parts diagram or service documentation when possible.
Can automotive engine-stand bolts fit a lawn mower?
The LS kit is described for automotive LS engine stands, not lawn mowers. Do not treat it as a mower engine bolt kit without confirmed specifications and application.