Husqvarna 531309679 HLN250-80 Blue Clamshell Bar – Genuine OEM Replacement Chainsaw Guide Ba
Part Number: 531309679
Category: Chainsaw Guide Bars, Cutting Equipment & Replacement Components
Type: HLN250-80 20-Inch Laminated Guide Bar – Genuine OEM Replacement Chainsaw Bar
The Husqvarna 531309679 HLN250-80 Blue Clamshell Bar is a genuine OEM 20-inch laminated chainsaw guide bar designed for select Husqvarna chainsaws. It uses a .325-inch chain pitch, .050-inch gauge, and an 80-drive-link chain configuration. Husqvarna parts references identify the bar as “HLN250-80 (Blue) Clamshell Bar.”
Product Specifications
- Part Number: 531309679
- Manufacturer: Husqvarna
- Product Type: Chainsaw Guide Bar
- OEM Description: HLN250-80 (Blue) Clamshell Bar
- Series: HLN250-80
- Bar Length: 20 Inches
- Chain Pitch: .325"
- Chain Gauge: .050"
- Required Drive Links: 80
- Bar Mount: Small Mount (SM)
- Nose Configuration: Sprocket Nose
- Nose Teeth: 10
- Construction: Laminated Guide Bar
- Component Type: Chainsaw Cutting Equipment
- Primary Application: Gas Chainsaw
- Compatible Brand: Husqvarna
- Installation Location: Chainsaw Bar Mount / Cutting Assembly
- Associated Components: Saw Chain / Drive Sprocket / Bar Nuts / Clutch Cover / Chain Tensioner
- Replacement Type: Genuine OEM Replacement
- OEM Status: Genuine Husqvarna OEM Part
- Condition: New
- Quantity: 1 Guide Bar
- Part Number Reference: 531309679
- Alternate Number Format: 531 30 96-79
- UPC: 705788505432
- Previous / Cross-Referenced Part Number: 580943701
The 20-inch length, .325-inch pitch, .050-inch gauge, 80-drive-link configuration, small mount and 10-tooth nose are documented in current Husqvarna guide-bar references.
Features & Benefits
- Genuine Husqvarna OEM chainsaw guide bar
- 20-inch cutting-bar length
- .325-inch chain pitch
- .050-inch chain gauge
- Designed for an 80-drive-link chain
- HLN250-80 guide-bar configuration
- Laminated construction
- Small chainsaw bar mount
- Sprocket-nose design
- Small nose radius supports good cutting control
- Helps guide the saw chain smoothly around the cutting system
- Designed for precise fit on compatible Husqvarna chainsaws
- Durable construction for demanding cutting applications
- Suitable for replacement of worn or damaged original guide bars
- Maintains the factory cutting-system configuration when properly matched
- Direct replacement for chainsaws requiring 531309679
20-Inch Guide Bar
The 531309679 is a 20-inch guide bar, providing a versatile cutting length for applications such as:
- Firewood cutting
- Limb removal
- Tree maintenance
- Property cleanup
- General-purpose chainsaw cutting
- Felling appropriately sized trees
- Bucking logs
- Storm cleanup
The appropriate bar length for any chainsaw depends on the saw model, engine output, chain configuration, and manufacturer specifications.
.325-Inch Chain Pitch
This guide bar is designed for a saw chain with a:
.325-inch pitch
Chain pitch refers to the spacing of the chain's drive and rivet components and must match the chainsaw's:
- Guide bar
- Saw chain
- Drive sprocket
A 3/8-inch or other-pitch chain should not be installed on a cutting system designed for .325-inch pitch.
.050-Inch Chain Gauge
The 531309679 requires a chain with a:
.050-inch gauge
Gauge describes the thickness of the chain's drive links where they travel through the guide-bar groove.
The chain gauge must correctly match the guide bar. A chain with an incorrect gauge may fit too loosely or may not properly enter the bar groove.
80 Drive Links
The appropriate chain configuration for this guide bar uses:
80 Drive Links
This specification is especially important when purchasing a replacement chain.
For 531309679, the primary cutting-system specifications are:
20" Bar / .325" Pitch / .050" Gauge / 80 Drive Links.
All specifications should match before installing a replacement saw chain.
Small-Mount Configuration
Husqvarna guide-bar documentation identifies HLN250-80 / 531309679 as a small-mount (SM) bar with a 10-tooth nose sprocket.
Guide bars with the same:
- Length
- Pitch
- Gauge
- Drive-link count
are not necessarily interchangeable if their bar-mount pattern differs.
The mounting slot, oil passages, tensioner holes, and overall mounting geometry must also match the chainsaw.
Laminated Guide Bar Construction
The 531309679 uses a laminated guide-bar design. Laminated bars are manufactured using multiple layers to provide a combination of strength and manageable weight.
Husqvarna describes this guide bar as laminated to help resist scratches and corrosion while its small nose radius promotes cutting control.
This construction makes the bar suitable for general-purpose and demanding chainsaw applications when properly maintained.
Documented Husqvarna Applications
The 531309679 is documented for select Husqvarna chainsaws including:
- Husqvarna 346XP
- Husqvarna 350
- Husqvarna 351
- Husqvarna 353
- Husqvarna 445 / 445e
- Husqvarna 450 / 450e
- Husqvarna 450 Rancher
- Husqvarna 545 Mark II
- Husqvarna 550 XP Mark II
Current retail documentation specifically identifies the bar for the 445(e), 450(e), 545 Mark II, 550 XP Mark II and 450 Rancher, while other parts references document the 346XP, 350, 351, 353 and 450.
Exact fitment should always be verified by chainsaw model and cutting-system specifications.
Guide Bar Function
The guide bar is one of the primary components of a chainsaw cutting system.
It helps:
- Support the saw chain
- Guide the chain around the cutting system
- Maintain chain alignment
- Provide the cutting path
- Support proper chain tension
- Deliver bar oil to the chain groove where applicable
- Maintain controlled chain movement
- Support accurate cutting
The guide bar works together with the saw chain and drive sprocket as a matched cutting system.
Sprocket Nose
The nose of the guide bar contains a sprocket that rotates as the chain travels around the bar tip.
A properly functioning nose sprocket helps:
- Guide the chain around the bar tip
- Reduce sliding friction
- Maintain smooth chain movement
- Support efficient cutting-system operation
The sprocket should rotate freely and should be inspected regularly for wear or damage.
Common Reasons for Replacement
Replacement of the 531309679 Guide Bar may be appropriate if the original bar has:
- Become bent
- Developed excessive rail wear
- Developed uneven rail wear
- Become pinched
- Developed excessive groove wear
- Sustained impact damage
- Developed a damaged nose sprocket
- Developed excessive burrs
- Become cracked
- Developed damaged mounting holes
- Developed oiling problems caused by bar damage
- Become unsuitable for maintaining proper chain alignment
- Reached the end of its service life
Guide bars are normal wear components and may eventually require replacement even when routinely maintained.
Possible Signs of Guide Bar Wear
A worn or damaged guide bar may contribute to:
- Chainsaw cutting crooked
- Chain pulling to one side
- Excessive chain movement
- Difficulty maintaining chain tension
- Chain binding
- Excessive vibration
- Uneven cuts
- Abnormal bar heating
- Chain frequently derailing
- Visible rail damage
- Excessive bar groove clearance
- Nose sprocket binding
Some of these symptoms can also result from a worn chain, improperly sharpened cutters, damaged drive sprocket, incorrect tension, or inadequate lubrication.
Guide Bar Inspection
Before installing a new chain or during routine chainsaw maintenance, inspect the guide bar for:
- Rail wear
- Rail burrs
- Groove damage
- Groove depth
- Bent rails
- Cracks
- Nose sprocket condition
- Mounting-slot damage
- Tensioner-hole damage
- Oil-hole blockage
- Uneven wear
Regular inspection can help identify a worn bar before it causes accelerated chain wear or poor cutting performance.
Cutting-System Compatibility
For proper operation, all major cutting-system specifications must match.
For Husqvarna 531309679, verify:
- Bar Length: 20"
- Pitch: .325"
- Gauge: .050"
- Drive Links: 80
- Bar Mount: Compatible Small Mount
- Chainsaw Model: Approved for the bar configuration
Do not choose a replacement chain based solely on bar length.
A 20-inch chain can have different:
- Pitch
- Gauge
- Drive-link count
and may therefore be incompatible with this guide bar.
Installation Considerations
Before installing 531309679:
- Shut off the chainsaw.
- Allow the engine and cutting system to cool.
- Engage the chain brake where appropriate.
- Remove the clutch/sprocket cover.
- Release chain tension.
- Remove the existing chain and guide bar.
- Inspect the drive sprocket.
- Clean the bar mounting surface.
- Clean the oil-delivery passages.
- Position the replacement guide bar onto the mounting studs.
- Install the compatible .325" / .050" / 80DL chain.
- Engage the chain with the drive sprocket.
- Reinstall the clutch cover.
- Adjust chain tension according to the chainsaw manufacturer's procedure.
- Secure the bar nuts.
- Recheck chain tension before operation.
Guide Bar Maintenance
To help maximize guide-bar service life:
- Keep the chain properly sharpened
- Maintain correct chain tension
- Keep the bar groove clean
- Keep oil passages clear
- Verify proper chain lubrication
- Inspect the rails regularly
- Remove rail burrs when appropriate
- Inspect the nose sprocket
- Replace heavily worn chains
- Inspect the drive sprocket
- Rotate the guide bar periodically when recommended
Uneven sharpening or inadequate lubrication can significantly accelerate guide-bar wear.
Important Notes
- Verify compatibility with your exact chainsaw model, product number, serial number, and cutting-system configuration before ordering.
- Match part number 531309679 directly with your chainsaw documentation when possible.
- The OEM description is “HLN250-80 (Blue) Clamshell Bar.”
- This is a 20-inch chainsaw guide bar.
- Required chain pitch is .325 inch.
- Required chain gauge is .050 inch.
- Required chain configuration is 80 drive links.
- Husqvarna guide-bar references classify 531309679 as HLN-250-80, small mount, 10-tooth nose, clamshell configuration.
- UPC is 705788505432.
- Parts references cross-reference 580943701 with 531309679.
- Do not select a replacement guide bar solely by bar length.
- Pitch, gauge, drive-link count, and bar-mount configuration must also match.
- Do not install a .058", .063", or other-gauge chain on this .050" guide bar.
- Do not install a 3/8" pitch chain on this .325" guide bar.
- Use an 80-drive-link chain when the chainsaw configuration specifies this bar.
- Do not operate the chainsaw with a bent, cracked, excessively worn, or damaged guide bar.
- Inspect the drive sprocket whenever installing a new guide bar.
- A severely worn drive sprocket can accelerate wear of a new bar and chain.
- Verify that the bar oil passages are clean before installation.
- Confirm that chain oil reaches the bar and chain during operation.
- Maintain correct chain tension.
- A chain that is too loose may derail, while excessive tension can accelerate bar, chain, sprocket, and bearing wear.
- Chainsaw cutting components become extremely hot during operation; allow them to cool before servicing.
- Wear appropriate cut-resistant gloves and eye protection when handling the saw chain.
- Follow the chainsaw manufacturer's safety and maintenance procedures.
- This listing is for one Husqvarna 531309679 HLN250-80 20-Inch Guide Bar only unless otherwise specified. The saw chain, drive sprocket, bar nuts, clutch cover, and other components are sold separately unless explicitly included.
- Match Husqvarna 531309679 and the 20" / .325" / .050" / 80DL specifications with your chainsaw before ordering to ensure proper fitment.
