PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

C9640-11Key,socket Head Screw

Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company · NSN 5120-01-162-0319 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-162-0319 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-162-0319. Primary manufacturer part number: C9640-11.
Features
  • Key,socket Head Screw — FSC 5120
  • Long Arm Length: 3.750 INCHES NOMINAL IN
  • Short Arm Length: 1.250 INCHES NOMINAL IN
  • Style Designator: L-HANDLE
  • Wrenching Surface Size: 0.313 INCHES NOMINAL BOTH ENDS IN
  • Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL
  • Material: STEEL OVERALL
  • 3 verified cross-references
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-01-162-0319, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-162-0319
Primary Part NumberC9640-11
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerLockheed Martin Corporation Div Lockheed Martin Aeronautics Company
StatusACTIVE
Long Arm Length3.750 INCHES NOMINAL IN
Short Arm Length1.250 INCHES NOMINAL IN
Style DesignatorL-HANDLE
Wrenching Surface Size0.313 INCHES NOMINAL BOTH ENDS IN
Wrenching Surface ShapeHEXAGON BOTH ENDS EXTERNAL
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
1630-00-180-512657028 INTERCHANGEABLE
Spider Assembly,duo-Servo
Serval Aviation Inc
5120-00-240-5274 INTERCHANGEABLE
Key,socket Head Screw
2990-00-377-520768013 INTERCHANGEABLE
Link,governor Overr
Cummins Inc.
1280-00-698-8337 INTERCHANGEABLE
Plate Assy,rate and
1420-00-981-9428 INTERCHANGEABLE
Latch Plate Assembly
5120-01-335-2093 INTERCHANGEABLE
Key,socket Head Screw
3010-01-350-91515701310 INTERCHANGEABLE
Insert,flexible Coupling
Leroi International Inc Dba Compair Leroi
3040-01-352-41736801-3 INTERCHANGEABLE
Connecting Link,rigid
Tyee Aircraft Inc Div Tyee Aircraft
7510-01-410-7012 INTERCHANGEABLE
Tab,signal
6130-01-500-5614 INTERCHANGEABLE
Power Supply
Cross-Reference Index
Part NumberManufacturer
C9640-11 PRIMARY Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company (USA)
57028 PRIMARY H-K Connecticut Holding Company (USA)
68013 Allen Mfg Co Sub of Chicago Pneumatic Tool Co (USA)
Related Parts
1630-00-180-5126INTERCHANGEABLE
SPIDER ASSEMBLY,DUO-SERVO
57028
5120-00-240-5274INTERCHANGEABLE
KEY,SOCKET HEAD SCREW
2990-00-377-5207INTERCHANGEABLE
LINK,GOVERNOR OVERR
68013
1280-00-698-8337INTERCHANGEABLE
PLATE ASSY,RATE AND
1420-00-981-9428INTERCHANGEABLE
LATCH PLATE ASSEMBLY
5120-01-335-2093INTERCHANGEABLE
KEY,SOCKET HEAD SCREW
3010-01-350-9151INTERCHANGEABLE
INSERT,FLEXIBLE COUPLING
5701310
3040-01-352-4173INTERCHANGEABLE
CONNECTING LINK,RIGID
6801-3
7510-01-410-7012INTERCHANGEABLE
TAB,SIGNAL
6130-01-500-5614INTERCHANGEABLE
POWER SUPPLY
5210-01-523-0196INTERCHANGEABLE
CALIPER,MICROMETER,OUTSIDE
T436.1XRL-3

Frequently Asked Questions

What is NSN 5120-01-162-0319?

NSN 5120-01-162-0319 is a Key,socket Head Screw, manufactured by Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-162-0319?

NSN 5120-01-162-0319 has 3 cross-referenced part numbers: C9640-11 (Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company), 57028 (H-K Connecticut Holding Company), 68013 (Allen Mfg Co Sub of Chicago Pneumatic Tool Co).

What NSN replaces 5120-01-162-0319?

There are 11 known substitutes for 5120-01-162-0319: 1630-00-180-5126, 5120-00-240-5274, 2990-00-377-5207 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of C9640-11?

Key specifications for C9640-11: Overall Length: 4.105 INCHES NOMINAL IN; Long Arm Length: 3.750 INCHES NOMINAL IN; Short Arm Length: 1.250 INCHES NOMINAL IN; Style Designator: L-HANDLE. 7 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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