Helicopter Rotor Drive System Parts Catalog

Are you looking to have it delivered today or tomorrow? Our team here at Unlimited NSN can help. Unlimited NSN is one of the leading U.S. distributors of helicopter rotor drive parts and other new, old, or obsolete aviation parts, including 012C, 01960, 220-242400-09, 31M22972*, 5541K11. Owned and operated by ASAP Semiconductor, Unlimited NSN has sold 100 million parts to date. ASAP Semiconductor is an ISO 9001:2015 certified company with an FAA AC-056B accreditation, and is also a member of the Aviation Suppliers Association (ASA). We are proud to offer an  inventory of over two billion ready-to-ship parts, 24/7 availability, and key locations in the United States, United Kingdom, and Canada. These attributes allow us to meet all aircraft on ground (AOG) requirements with ease. 

Use our optimized search engine to find your required part—then submit an instant RFQ for a quick, competitive quote. Here at Unlimited NSN, we make your purchasing process as simple and efficient as possible. 

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Part No Description RFQ
012C O-Ring RFQ
01960 Bead Chain RFQ
220-242400-09 Clip RFQ
31M22972* Engine Starter Ring Gear Assembly (supersedes LW-16471* and 31M21951* starter ring gear assembly used on O-540 engine) RFQ
5541K11 Pipe Wrap (self-adhesive) RFQ
A101-4 Rod End RFQ
A15A Diode RFQ
A185-1 Bracket RFQ
A185-2 Bracket RFQ
A185-3 Plate RFQ
A185-5 Bracket RFQ
A215-017 O-Ring RFQ
A215-020 O-Ring RFQ
A215-029 O-Ring RFQ
A215-042 O-Ring RFQ
A215-152 O-Ring RFQ
A215-156 O-Ring RFQ
A215-222 O-Ring RFQ
A215-382 O-Ring (use only with C263-2 sump) RFQ
A257-19 Lubricant RFQ
A257-2 Oil - Gearbox (one-gallon bottle) RFQ
A257-2LT Oil - Gearbox (one-liter bottle) RFQ
A257-4 Oil - Type “A” ATF (Dexron III) RFQ
A650-4 Fitting RFQ
A653-2* Mount (supersedes A653-1; if replacing a -1 mount replace both forward mounts) RFQ
A654-56 Decal RFQ
A7260 Chip Detector RFQ
A938-3 Mount - Test Switches RFQ
A938-5 Mount - Test Switches RFQ
AGC-1.5 Fuse (1.5 amp, for 28-volt ships) RFQ
AGC-3 Fuse (3 amp, for 14-volt ships) RFQ
AN3-41A Bolt RFQ
AN316-5R Nut RFQ
AN320-8 Nut (B270-11 on threads) RFQ
AN526C832R6 Screw RFQ
AN742-3 Clamp RFQ
AN814-8D Filler Plug RFQ
AS111 O-Ring RFQ
B033-6 Knob Assembly - Rotor Brake RFQ
B033-6 Knob Assembly (includes knob and chain) RFQ
B049-3 Harness Assembly RFQ
B115-1 Bearing RFQ
B125-2 Connector RFQ
B157-1 Mount RFQ
B158-12 Heat Shrink RFQ
B158-2 Heat Shrink RFQ
B158-3 Heat Shrink (around wires, terminals) RFQ
B158-6 Heat Shrink (around fuse holder) RFQ
B158-8 Heat Shrink RFQ
B158-8 Heat Shrink (14-volt ships) RFQ
B263-1 Pin RFQ
B263-12 Housing (14-volt ships) RFQ
B263-14 Housing (28-volt ships) RFQ
B263-15 Housing RFQ
B263-18* Housing RFQ
B263-19* Housing RFQ
B263-3 Pin RFQ
B270-10 Adhesive RFQ
B270-2 Sealant - Metal (silver) RFQ
B289-3 Screw RFQ
B320-2 Sender Assembly RFQ
B330-13 Palnut RFQ
B330-16 Palnut RFQ
B330-19 Palnut RFQ
B566-1* Chip Detector RFQ
B570-1 Magnet Assembly RFQ
BP4100 Pulley RFQ
C006-1 or -3 Main Rotor Gearbox and Mast Assembly RFQ
C006-2 Rotor Brake Assembly RFQ
C006-6* Main Rotor Gearbox and Mast Assembly RFQ
C006-7* Main Rotor Gearbox and Mast Assembly RFQ
C006-8* Main Rotor Gearbox and Mast Assembly RFQ
C006-8R* C006-8 Main Rotor Gearbox and Mast Assembly RFQ
C007 Shaft and Bearing Assembly RFQ
C007-5 Shaft and Bearing Assembly (Incl C181-3 lower bearing) RFQ
C007-5R C007-5 Shaft and Bearing Assembly (overhaul exchange) RFQ
C018 Clutch Assembly RFQ
C018-2* Clutch Assembly RFQ
C018-2R C018-2 Clutch Assembly (overhaul exchange; includes new C166-4 shaft) RFQ
C018-3* Clutch Assembly RFQ
C018-3R C018-3 Clutch Assembly (overhaul exchange; includes new C166-4 shaft) RFQ
C049-2 Harness Assembly RFQ
C049-4 Harness Assembly RFQ
C049-5 Harness Assembly - Overtemp Switch RFQ
C051-1 Actuator Assembly (14-volt ships) RFQ
C051-1R C051-1 Actuator Assembly (overhaul exchange) RFQ
C051-1R C051-2 Actuator Assembly (overhaul exchange) RFQ
C051-2 Actuator Assembly (28-volt ships) RFQ
C105-2 Journal RFQ
C146-1 Gear Set RFQ
C146-5 Gear Set RFQ
C166-4 Shaft - Clutch RFQ
C167-3 Housing RFQ
C167-5 Housing RFQ
C168-4 Retainer RFQ
C168-5 Retainer RFQ
C181-3 Bearing RFQ
C182-1 Nut RFQ
C184-2 Bearing Assembly - Upper RFQ
C184-2R C184-2 Bearing Assembly - Upper (overhaul exchange) RFQ
C191-1 Block RFQ
C215-029 O-Ring (lubricate with A257-1 grease) RFQ
C215-279 O-Ring (use only with C263-1 sump) RFQ
C244-1 Bracket RFQ
C251-1 Shaft - Main Rotor Drive RFQ
C251-2 Shaft - Main Rotor Drive RFQ
C257-2 Cover RFQ
C261-1 Mast Fairing Assembly RFQ
C264-1 Housing RFQ
C264-2 Housing RFQ
C270-1 End Cover RFQ
C273-1 Roof RFQ
C273-1 Roof Panel RFQ
C283-1 Mast Assembly RFQ
C553-1 Block RFQ
C647-1 Bearing (main rotor shaft upper bearing) RFQ
C648-2 Bearing - Journal RFQ
C653-3* Mount RFQ
C747-1 Baffle Assembly RFQ
C947-1 Flex Plate Assembly RFQ
C966-3 Seal RFQ
C966-5 Seal RFQ
C967-1 Plug RFQ
D049-4 Harness Assembly RFQ
D110-1 Arm Assembly - Upper RFQ
D110-1 Arm Assembly RFQ
D111-1 Bracket RFQ
D112-1 Lever RFQ
D113-1 Link RFQ
D113-2 Link RFQ
D114-1 Bracket RFQ
D117-1 Guard RFQ
D117-2 Guard RFQ
D118-1 Bracket Assembly RFQ
D122-1 Bracket Assembly RFQ
D122-6 Plate RFQ
D123-1 Arm Assembly RFQ
D123-1 Arm Assembly - Lower RFQ
D126-1 Cable Assembly RFQ
D174-2 Fanwheel Assembly RFQ
D174-2R D174-2 Fanwheel Assembly (overhaul exchange) RFQ
D210-10 Nut RFQ
D210-3 Nut RFQ
D210-4 Nut RFQ
D262-11 Fuse Holder RFQ
D276-1 Gearmotor Assembly (14-volt ships) . RFQ
D276-3 Gearmotor Assembly (28-volt ships) . RFQ
D500-1 Pump RFQ
D796-1 Duct Assembly RFQ
F283-3 Mast Assembly RFQ
KI-202 Retainer Upgrade Kit RFQ
MS20074-04-04 Bolt (earlier non-hydraulic R44s) RFQ
MS20426AD3 Rivet RFQ
MS20426AD4 Rivet (at outboard positions) RFQ
MS20470AD4 Rivet RFQ
MS20995C32 0.032 in. dia. Safety Wire RFQ
MS20995C41 0.041 in. dia. Safety Wire RFQ
MS21042L04 Nut RFQ
MS21042L06 Nut RFQ
MS21042L08 Nut RFQ
MS21042L3 Nut RFQ
MS21042L4 Nut RFQ
MS21042L5 Nut RFQ
MS21042L6 Nut RFQ
MS21075L3E Nutplate RFQ
MS24566-1B Pulley (or AN210-1A) RFQ
MS24566-1B Pulley (supersedes AN210-1A) RFQ
MS24665-134 Cotter Pin RFQ
MS24665-283 Cotter Pin RFQ
MS27039C0806 Screw RFQ
MS27039C0812 Screw RFQ
MS27039C1-07 Screw RFQ
MS27039C1-09 Screw RFQ
MS27039C1-11 Screw RFQ
MS35206-219 Screw RFQ
MS35206-228 Screw RFQ
NAS1304-15 Bolt RFQ
NAS1352-08LE6P Screw RFQ
NAS1352-4-12 Screw RFQ
NAS1352-4-16 Screw RFQ
NAS1352-4-30 Screw RFQ
NAS428-3-14 Bolt RFQ
NAS428-3A-14 Bolt RFQ
NAS6603-10 Bolt RFQ
NAS6603-11 Bolt RFQ
NAS6603-12 Bolt RFQ
NAS6603-24 Bolt RFQ
NAS6603-28 Bolt RFQ
NAS6603-40 Bolt RFQ
NAS6603-8 Bolt RFQ
NAS6604-11 Bolt RFQ
NAS6604-13 Bolt RFQ
NAS6604-21 Bolt RFQ
NAS6605-38 Bolt RFQ
NAS6605-42 Bolt RFQ
NAS6606-31 Bolt RFQ
NAS6606-5 Bolt RFQ
NAS6608H42 Bolt RFQ
NAS9301B-4-02 Rivet RFQ
R8206 C283-3 Mast Tube Upgrade Kit RFQ

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