×
Description
4255 708 3106 – STIHL Union Nut Genuine OEM Part
The STIHL Union Nut 4255 708 3106 is a genuine OEM replacement fastening component designed for select STIHL sprayers, including the SG 71, SG 51, and SG 31 models. This union nut secures spray system connections, ensuring tight, leak-free fittings and consistent spray performance during operation.
Union nuts are essential for maintaining sealed connections between hoses, spray guns, and spray lances. Over time, fastening nuts may become worn, cracked, stripped, or damaged due to repeated tightening, vibration, or chemical exposure. A faulty union nut can lead to leaks, pressure loss, or unstable spray connections.
Replacing the union nut with the correct genuine STIHL OEM part restores proper connection security, pressure retention, and reliable sprayer performance.
Manufactured to STIHL factory specifications, this OEM union nut ensures precise fitment, secure fastening strength, and long-term durability under demanding agricultural and landscaping conditions.
Product Details
-
Part Number: 4255 708 3106
-
Brand: STIHL
-
Part Type: Union Nut / Fastening Nut
-
Application: Spray gun and lance connection system
-
Condition: New Genuine OEM Part
Replaces
-
4255 708 3100 (Old Part Number)
Function
-
Secures hose and spray gun/lance connections
-
Maintains leak-free fluid transfer
-
Prevents pressure loss at connection points
-
Replaces cracked, stripped, or worn fastening nuts
-
Supports stable and reliable sprayer operation
⚠️ A damaged union nut may cause leaks or reduced spray pressure.
Verify Fitment (Recommended)
Before ordering, confirm:
-
OEM part number 4255 708 3106
-
Your unit model matches those listed below
-
Application matches your STIHL illustrated parts diagram
⚠️ Fastening components are model-specific — always verify by OEM part number.
Compatibility
-
STIHL SG 71 (Spray Gun, Spray Lance/Wand Assembly)
-
STIHL SG 51 (Spray Gun, Spray Lance/Wand Assembly)
-
STIHL SG 31 (Pump, Container Assembly)
(Exact fitment depends on production version — always verify using OEM parts diagram.)
Installation Notes
-
Relieve sprayer pressure before servicing
-
Remove damaged or worn union nut
-
Install new nut securely onto connection fitting
-
Tighten properly to ensure leak-free seal
-
Test sprayer for pressure stability and leaks
⚠️ Do not overtighten to avoid damaging threads.
Maintenance Tips
-
Inspect fittings regularly for wear
-
Replace worn fastening nuts promptly
-
Keep connection points clean
-
Store sprayer components in dry conditions
-
Always use genuine STIHL OEM spray system parts
