Description

A stronger replacement trimmer head for lighter duty equipment.

Same precise fit and premium extended wear nylon components used in all Hammerhead performance trimmer heads.

For lighter-duty lawn-trimmer owners the Thresher 425 from Hammerhead is a significant performance and quality upgrade from their original equipment. The little, rugged and dependable trimmer head with a traditional spool style line-loading system.

Model HH-TH425LH-10125 features:
Extended Wear Nylon – a premium polymer composite construction providing the best wear characteristics in the industry. Large, 1″ x 1″ x 1″, billet aluminum arbor for greater stability.
Works on STRAIGHT SHAFT trimmers only.

Fits receiving bolts sized to accept a 10 MM x 1.25 LHF arbor.
Capacity: 19′ of .080″ line, 16′ of .095″ line or 13′ of .11″ line.
LIFETIME REPLACEMENT COVERAGE – ONE YEAR FULL WARRANTY – 30 DAY SATISFACTION
All Hammerhead Performance Trimmer Heads have lifetime replacement coverage starting with our one year full warranty for manufacturers defects and continued through our lifetime low cost, part replacement program.

What makes Hammerhead Performance Trimmer Heads so tough?

• All nylon parts are not created equal ⋅ Because most manufacturers settle for good enough — stock trimmer heads don’t contain the best and costliest materials. In general, OEM trimmer heads contain a nylon reinforced with glass fillers. In contrast, Hammerhead Performance Trimmer Heads use a high-grade, nylon. One strengthened with an elastic additive designed to distribute impact force. As a result, Hammerhead performance trimmer heads can withstand higher levels of impact stress, longer terms of abrasive wear 500 times beyond ISO shock test standards.
• A better fit—right out of the box ⋅ Hammerhead performance trimmer heads set a higher standard. When we make trimmer heads, each part measures within tenths of millimeters from each other — meaning a glove-like fit and no fiddling with stubborn parts.  No struggle to put together a trimmer head. With Hammerhead all parts slide together smoothly ever single time.
• A wobble free arbor ⋅ Hammerhead performance trimmer heads bolt to a billet aluminum center arbor. A better way to attach a trimmer head. While all other trimmer heads provide a universal “bag of bolts” and ask you to pick out one that fits okay. Hammerhead has a large center arbor that is friction fitted and balance checked at the factory for an accurate and smooth spin. One specifically sized to your trimmer’s receiving bolt.
• Superior debris protection ⋅ Trimmer heads fail when dirt and grit get inside. Debris that will quickly wear the moving parts that advance the line. Hammerhead’s large, overlapping interior walls interlock and block foreign matter from entering critical mechanisms.