The Husqvarna 505631901 Jam Nut 1/4-20 Stainless Steel is a genuine OEM fastener designed for the SoffCut2500 and SoffCut5000 early entry saws and the FS4600G floor saw. As a direct Husqvarna OEM component, this jam nut is manufactured to the exact thread specification and material grade used in original assembly — ensuring a secure, corrosion-resistant hold wherever it is installed. Cross-reference part number 505631901 against your parts diagram to confirm the correct position before ordering. DHS Equipment supplies this part to help keep your equipment running at full capacity.
Key Features
- Stainless Steel Construction — Grade stainless material resists corrosion and oxidation, making this jam nut well suited to the wet-cutting and slurry environments common in concrete sawing applications.
- Correct 1/4-20 Thread Specification — Machined to the exact 1/4-20 thread pitch used in the original assembly, this nut threads on cleanly without chasing or reworking the mating fastener.
- Genuine Husqvarna OEM Part — Manufactured to Husqvarna's original engineering specification, this component matches the dimensional and material standards of the part it replaces.
- Broad Saw Compatibility — Fits the SoffCut2500 and SoffCut5000 early entry saws as well as the FS4600G floor saw, covering multiple saw platforms with a single part number.
- Secure Locking Hold — A jam nut locks an adjacent nut or threaded component in position under vibration; using the correct replacement maintains the clamping integrity the original design requires.
A jam nut is a thin locking nut threaded against a standard nut or shoulder to prevent loosening under load and vibration — a common challenge on concrete cutting equipment where engine and blade vibration is continuous. On early entry saws like the SoffCut2500 and SoffCut5000, and on floor saws like the FS4600G, fastener security is critical to blade tracking, guard positioning, and overall structural integrity. When a jam nut strips, corrodes, or backs off, the assembly it secures can shift or loosen, creating both a performance issue and a potential safety concern — making prompt replacement with the correct OEM specification part the right call.
Part Details
| Part Number | 505631901 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Jam Nut 1/4-20 Stainless Steel |
Compatibility & Fitment
| Name | Model |
|---|---|
| Early Entry Saw | SoffCut2500 |
| Floor Saw | FS4600G |
| Early Entry Saw | SoffCut5000 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
