Skip to Content
  1. All products
  2. Castlenut
  3. AN320-4 - CASTLE NUT
  4. Castlenut
Pricelist: - Pricelist
Pricelist: - Pricelist
AN320-4 - CASTLE NUT

AN320-4 - CASTLE NUT

(0 review)
$ 1.29 $ 1.29

CASTLE NUT - AN320-4
Genuine OEM Part

Description:   CASTLE NUT
Part number:   AN320-4
Industry Standards/Certification:   AN320 
Alternate part number:   404-393, 130909N16

Castellated Nut - Thread: 1/4-28, Shear , Cadmium Plated Steel

AN320-4   SPECIFICATIONS

Parameter     Characteristics
Thread Class:3B
Thread Direction:Right-hand
Nut Style:Slotted, hexagon
Nut Height:0.178 inches minimum and 0.198 inches maximum
Width Across Flats:0.428 inches minimum and 0.440 inches maximum
Thread Series:UNF
Thread Quantity per Inch:28
Nominal Thread Size:0.250 inches
Bearing Surface Type:Chamfered or washer faced
Material:Steel overall
Surface Treatment:Cadmium overall
Surface Treatment Document and Classification:QQ-P-416, ty 2, cl 3 fed spec single treatment response overall


This part is used on the following aircraft:

  1. Bombardier Challenger 601
  2. Bombardier Challenger 604
  3. Bombardier Challenger 605
  4. Bombardier Global Express
  5. Bombardier Learjet 40
  6. Bombardier Learjet 45
  7. Bombardier Learjet 55
  8. Bombardier Learjet 60 - all variants
  9. Gulfstream G-IV/GIV-SP/G-400/G-450/G-300
  10. Gulfstream G-V/G-V-SP/G-550/G-500
  11. Piaggio Avanti II
  12. Piaggio Avanti P180
  13. Piper Aircraft PA-42 Cheyenne
  14. Textron Aviation Beechcraft King Air 100 - all variants
  15. Textron Aviation Beechcraft King Air 200 - all variants
  16. Textron Aviation Beechcraft King Air 90 - all variants
  17. Textron Aviation Beechcraft Premier
  18. Textron Aviation Bell 206 Jetranger/Longranger
  19. Textron Aviation Cessna 500 Citation I-ISP
  20. Textron Aviation Cessna 510 Citation Mustang
  21. Textron Aviation Cessna 525 Citation Citationjet
  22. Textron Aviation Cessna 550 Citation I-II-Bravo
  23. Textron Aviation Cessna 560 Citation V-Ultra-Encore-Excel-XLS
  24. Textron Aviation Cessna 650 Citation III-IV-VI-VII
  25. Textron Aviation Cessna 680 Citation Sovereign
  26. Textron Aviation Cessna 750 Citation X
  27. Textron Aviation Hawker 400-400XP
  28. Textron Aviation Hawker 800
  29. Textron Aviation Hawker 800XP-850XP
  30. Textron Aviation Hawker 900XP



Between AirParts' branded hardware products, and our Seller's hardware offerings, we have hundreds of thousands of hardware parts in stock.