Description

GB Pro-Top Titanium Sprocket-Nose Bar — .404″ × .063″ (12 mm SN / D025 Mount)

Built for professional cutters. GB’s Pro-Top Titanium bar pairs a hard-wearing replaceable sprocket nose with a lightweight, high-strength titanium-alloy steel body. It’s engineered for high-speed, high-power saws where low weight, long life and precise control matter.

Key Features

• Replaceable sprocket-nose for extended service life
• High-tech titanium-alloy steel for strength with reduced weight
• Optimised for professional, high-RPM cutting
• Smooth, accurate cutting with excellent rail durability

Specifications

• Pitch: .404″
• Gauge: .063″
• Mount: 12 mm SN (D025)
• Compatibility: Requires .404″ drive sprocket — not compatible with 3/8″

Select your preferred length from the product drop-down.

Fitment (Stihl – with upgraded .404″ drive sprocket)

064, 066, MS440, MS460, MS461, MS462 C, MS500i, MS650, MS660, MS661.

Important Chain Length Notes (Installation & Tension Range)

• 20″ (SN20-63VQ):
  • Takes 65DL chain for installation only when clutch c-clip & rim sprocket are removed to loop the chain; refit before operation.
  • 66DL tensions at approx. 85% of adjuster travel (near maximum).
• 25″ (SN25-63VQ):
  • Takes 76DL chain for installation only when clutch c-clip & rim sprocket are removed to loop the chain; refit before operation.
  • 77DL tensions at approx. 85% of adjuster travel (near maximum).

Note: Adjuster range varies with rim size, bar wear and saw setup. Always reinstall the clutch c-clip and rim sprocket before running the saw.

.404″ Drive-Link Counts & Weights

Drive-link (DL) counts are sourced from GB Forestry Australia and assume a standard 7-tooth .404″ rim sprocket. Required DL can vary with rim size (7T vs 8T), spur sprockets, saw model, bar wear and chain type. Always confirm against your existing chain and setup before ordering.

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Part #	Length	Approx. DL	Weight (kg)
SN20-63VQ	20″	65 / 66*	1.3
SN25-63VQ	25″	76 / 77*	1.5
SN30-63VQ	30″	88	1.8
SN32-63VQ	32″	95	2.2
SN36-63VQ	36″	104	3.0
SN42-63VQ	42″	123	3.4

*See “Important Chain Length Notes” for SN20 & SN25 installation and tension details.

Pro Tips

• Confirm rim size — an 8-tooth rim generally adds 1–2 drive links.
• Always reinstall the clutch c-clip and rim sprocket before operating the saw.

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