What aircraft is the ABI titanium tailspring approved for?

The ABI-51599 and ABI-51599-1 titanium tailsprings are designed for certified Piper PA-18 Super Cub aircraft, FAA STC approved under SA02573AK.

What is the difference between ABI-51599 and ABI-51599-1?

ABI-51599 is the 2-bolt configuration and ABI-51599-1 is the 1-bolt configuration. Both are machined from the same 6AL-4V titanium and share identical performance characteristics. Choose based on your airframe's tailwheel attachment configuration.

What material is the ABI titanium tailspring made from?

It is machined from 6AL-4V titanium, the same alloy used widely in aerospace and high-performance structural applications. It is heat-treated for maximum strength and durability.

Does the titanium tailspring require shorter bolts than the OEM steel spring?

Possibly. Because the titanium tailspring is thinner than a traditional steel tailspring, shorter AN bolts may be required for both the tailwheel-to-spring attachment and the spring-to-fuselage attachment. Always use a new locknut and verify at least 2 threads are visible above the locknut after torquing.

What are the torque specs for installing the ABI titanium tailspring?

Torque the AN7 bolt(s) securing the tailwheel assembly to the spring to 40 ft/lbs. For the three fuselage attachment bolts, torque the AN7 bolt to 40 ft/lbs and the AN4 bolts to 5 ft/lbs. Use new locknuts and confirm at least 2 threads protrude above each nut.

Does the titanium tailspring need to be painted?

No. Titanium's natural corrosion resistance eliminates the need for paint. However, it can be painted if preferred.

Does installing the ABI titanium tailspring require STC documentation for a certified PA-18?

Yes. The STC is SA02573AK, which covers both the titanium and steel tailspring part numbers. STC paperwork is available separately under part number SA02573AK.

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Home / Shop Parts / ABI-51599-1

P/N: ABI-51599-1

Name: PA-18 TITANIUM TAILSPRING, 1 BOLT
Brand: Alaska Gear Company
SKU: ABI-51599-1
Price: 1995.0 USD
Availability: BackOrder

PA-18 TITANIUM TAILSPRING, 1 BOLT

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Approval	FAA PMA, FAA PMA STC
Condition	New
Manufacturer	Alaska Gear Company
Dimensions	N/A
Weight	N/A
Unit of Measure	Each
Retail Price	$2,493.75
Your Price	$1,995.00
Stock Status	Expected ship date is 06-16-2026. alternates Notify me when it's back in stock Email *

Eligible Aircraft

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Eligible Aircraft

Make	Model	Start S/N	End S/N	Eligibility Chart
Piper	PA-18	18-1	18-7632	7842
Piper	PA-18-105 (Special)	18-1	18-7632	7842
Piper	PA-18-125 (Army L-21A)	18-1	18-7632	7842
Piper	PA-18-135 (Army L-21B)	18-1	18-7632	7842
Piper	PA-18-150	1809001	1809113	7842
Piper	PA-18-150	18-3771	18-8309025	7842
Piper	PA-18A	18-1	18-7632	7842
Piper	PA-18A-135	18-1	18-7632	7842
Piper	PA-18A-150	18-3771	18-8309025	7842
Piper	PA-18AS-125	18-1	18-7632	7842
Piper	PA-18AS-135	18-1	18-7632	7842
Piper	PA-18AS-150	18-3771	18-8309025	7842
Piper	PA-18S	18-1	18-7632	7842
Piper	PA-18S-105 (Special)	18-1	18-7632	7842
Piper	PA-18S-125	18-1	18-7632	7842
Piper	PA-18S-135	18-1	18-7632	7842
Piper	PA-18S-150	1809001	1809113	7842
Piper	PA-18S-150	18-3771	18-8309025	7842
Piper	PA-19 (Army L-18C)	19-1	19-3	7842
Piper	PA-19S	19-1	19-3	7842

Eligibility Chart 7842 Notes

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Product Details

ABI Piper PA-18 Titanium Tailsprings

Titanium Tailsprings For Piper PA-18 Super Cub
The ABI-51599 and ABI-51599-1 tailsprings are significantly lighter than steel, with superior shock absorption and elasticity for smoother landings across a wide range of conditions. Heat-treated for maximum strength and durability. Titanium's natural corrosion resistance eliminates the need for paint, reducing long-term maintenance costs. Can be painted if desired.