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Rotary

Rotary # 8521 BUMP HEAD KNOB HOMELITE

Rotary # 8521 BUMP HEAD KNOB HOMELITE

$5.99 USD
$5.99 USD
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The Rotary #8521 Bump Head Knob is a high-quality aftermarket replacement for the Homelite/Jacobsen A97910A. This red knob is designed specifically for EZ Line Advance Systems and is compatible with a wide range of straight-shaft trimmers from Homelite and John Deere.

Key Specifications

  • Part Number: Rotary 8521 (also listed as 27-8521)
  • OEM Cross-Reference: Replaces Homelite/Jacobsen A-97910-A, 308042003, and John Deere UP06764.
  • Thread Type: 5/16"-18 Left-Hand Threads.
  • Color: Red (Note: This is often used to replace the original green John Deere knobs).

Compatibility

This bump knob fits most Homelite straight-shaft machines, including:

  • Homelite Models: ST-275, ST-285, ST-385, ST-485, HBC-30, GST-BC, and HLT28.
  • John Deere Models: S1400 and BC1600.



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Product guide

Product information

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Overview

Rotary # 8521 BUMP HEAD KNOB HOMELITE

The Rotary #8521 Bump Head Knob is a high-quality aftermarket replacement for the Homelite/Jacobsen A97910A. This red knob is designed specifically for EZ Line Advance Systems and is compatible with a wide range of straight-shaft trimmers from Homelite and John Deere.

Key Specifications

  • Part Number: Rotary 8521 (also listed as 27-8521)
  • OEM Cross-Reference: Replaces Homelite/Jacobsen A-97910-A, 308042003, and John Deere UP06764.
  • Thread Type: 5/16"-18 Left-Hand Threads.
  • Color: Red (Note: This is often used to replace the original green John Deere knobs).

Compatibility

This bump knob fits most Homelite straight-shaft machines, including:

  • Homelite Models: ST-275, ST-285, ST-385, ST-485, HBC-30, GST-BC, and HLT28.
  • John Deere Models: S1400 and BC1600.



RotaryHeads,Head Parts,Arbor BoltsSKU: ROT-8521Available

Key features

  • Arbor Bolts
  • Brand: Homelite
  • Brand: Rotary
  • Head Parts
  • Heads
  • Product Type: Heads / Head Parts / Arbor Bolts

Technical specifications

Vendor
Rotary
Product type
Heads,Head Parts,Arbor Bolts
SKU
ROT-8521

Compatibility

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What's included

Package contents follow the selected product and variant shown above. Contact support if you need confirmation.

Optional accessories

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Warranty and support

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Shipping

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Product FAQs

How do I confirm this is the right product?

Review the product title, images, selected variant, SKU, and any compatibility notes listed on this page. If the manufacturer details are missing, contact support before ordering.

Where can I find the technical specifications?

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