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 Product Notes

  • Basic Design: 1B90
  • FAA Type Certificate: P842
  • SAE Number/Type of Flange: SAE #1
  • Diameter of Circle: 4.375 inches
  • Bolt Diameter: 3/8 inch
  • Number of Bolts: 6
  • Spacer/Adapter: None
  • Installation Weight: 23.5 lbs
  • Installation Bolt Kit: Tapered crankshaft requires bolt kit UB4622-42, flanged crankshaft requires bolt kit UB4622-9

NOTE: 1A90/CF elliptical tip models and 1B90/CM square tip models having the same diameter and pitch are directly interchangeable, except for CF7538 on Cessna 150G, H, J, and K model sea planes.

Applicability Chart

AircraftEngineProp TypeMaximum DiameterMinimum Diameter
Aeronca SO58B Continental
Climb 74 72.5
Bellanca S11AC "Chief" Continental
Climb 74 72
Mooney 415C, 415CD (Erco) Continental
A-65-7, -8, -9, -9J; C-75-12, -12F
Climb 74 72.5
Trytek (Aeronca) S65-C Seaplane Continental
A-65-3, -3J, -6, -6J, -7, -7J, -8, -9, -9J
Climb 74 72.5
Trytek (Aeronca) S65-CA Seaplane Continental
A-65-7, -7J, -8, -8J, -9, -9J
Climb 74 72.5

We do not guarantee that all items for sale through our website, catalog or advertising are in stock at all times. Price and availablility is subject to change without notice. Univair reserves the right to charge you the current price of the item at the time your order is fulfilled/shipped, not the price at the time your order was placed. For further details, see this article in our Knowledge Base or contact our sales department during regular business hours.

To the extent that the trademarks or registered trademarks of an original equipment manufacturer other than Univair are mentioned on this website, the name of that manufacturer is only for descriptive use and does not imply any affiliation with, manufacture by or endorsement by the respective owners of such trademark. Many products of Univair are replacement products for products of original equipment manufacturer of the aircraft. Univair to the extent required by Federal law obtains approval from the FAA for the manufacture of replacement parts for aircraft. The reference to the name of the original manufacturer is for identification purposes only and not to represent the original manufacturer is associated in any way with the Univair product.

 Shipping & Returns


Univair charges ACTUAL SHIPPING COSTS on all shipments. The shipping charges calculated during checkout are ESTIMATES only. We will adjust your final invoice depending on the size, weight and number of packages being sent. Full details can be found on our How We Calculate Shipping Costs page.

Free Shipping Promotion

Orders over $300.00 may qualify for free ground shipping within the contiguous United States. Orders over $3,000.00 may qualify for free motor freight (truck) shipping within the contiguous United States. Full details can be found on our Free Ground Shipping Information page.

Shipping Hazardous Materials (HAZMAT)

Products classified as Hazardous Materials (HAZMAT) cannot be shipped outside the contiguous United States (lower 48 states). 5 gallon and 55 gallon sizes will only be shipped via Motor Freight; smaller sizes can be shipped via UPS Ground Hazmat. Full details can be found on our Restrictions on Shipping Hazmat Items page.


All items returned to Univair for a refund or credit must be authorized in advance. Additional conditions apply. Full details about our return policy can be found on our How to Return an Item page.

To initiate a return, call Univair at 303-375-8882 to receive a Return Merchandise Authorization (RMA).

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Univair Aircraft Corporation

2500 Himalaya Road
Aurora, Colorado 80011

Toll Free Sales: 888-433-5433
Phone: 303-375-8882
Fax: 303-375-8888

Hours of Operation
Monday - Friday — 7:30am-4:30pm MT
Saturday - Sunday — Closed

© 2022 Univair Aircraft Corporation. Prices and availablility are subject to change without notice.

All product and company names are trademarks or registered trademarks of their respective owners. Univar's descriptive use does not imply any affiliation with or endorsement by the respective owners.

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