PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

S21Plug,sight

Eaton Aerospace Llc Div Fluid and Electrical Distribution Division · NSN 6680-00-053-3961 · FSC 6680 · No Item Name Available
Verified by PartsTable
NSN 6680-00-053-3961 — this item is cataloged by the U.S. Government under National Stock Number 6680-00-053-3961. Primary manufacturer part number: S21.
Features
  • Plug,sight — FSC 6680
  • 2 verified cross-references
  • Primary manufacturer: Eaton Aerospace Llc Div Fluid and Electrical Distribution Division
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Plug,sight, cataloged under National Stock Number 6680-00-053-3961, is classified within Federal Supply Class 6680 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Eaton Aerospace Llc Div Fluid and Electrical Distribution Division. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NamePlug,sight
FSC / FSG6680 — No Item Name Available (FSG 66)
ManufacturersSatair A/s (CAGE R1120); Eaton Aerospace Llc Div Fluid and Electrical Distribution Division (CAGE 97484)
Technical Specifications
ParameterValue
NSN6680-00-053-3961
Primary Part NumberS21
Item NamePlug,sight
FSC / FSG6680 / 66 — No Item Name Available
ManufacturerEaton Aerospace Llc Div Fluid and Electrical Distribution Division
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5120-00-156-8609S21 INTERCHANGEABLE
Die,crimping Tool
Souriau Usa, Inc. Dba Souriau Usa Inc
3460-00-189-9132 INTERCHANGEABLE
Holder,cutting Tool
5130-00-293-1411IM302A INTERCHANGEABLE
Socket,socket Wrench
Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
1650-00-310-212120020-248-100 INTERCHANGEABLE
Filtering Disk,fluid
Pall Aeropower Corp Sub of Pall Corp Mectron Industries Div
4810-00-325-3197S-21-INTERNAL#0319079 INTERCHANGEABLE
Seat,valve
Sloan Valve Company
3433-00-355-6243638948 INTERCHANGEABLE
Tip,welding Torch
Esab Group, Inc., the Dba Esab Welding and Cutting Products Div Esab Welding and Cuttng
3110-00-690-8923LM501349-LM501310 INTERCHANGEABLE
Bearing,roller,tapered
The Timken Corporation
9905-00-721-8291S2-1B INTERCHANGEABLE
Sign,traffic
Federal Prison Industries, Inc - Ebg
4730-01-128-524120020-325-100 INTERCHANGEABLE
Strainer Element,sediment
Pall Aeropower Corp Sub of Pall Corp Mectron Industries Div
4730-01-130-5476S21-355-100 INTERCHANGEABLE
Strainer Element,sediment
Eaton Aerospace Llc Dba Eaton Aerospace Jackson
Cross-Reference Index
Part NumberManufacturer
S21 Satair A/s (DNK)
S21 PRIMARY Eaton Aerospace Llc Div Fluid and Electrical Distribution Division (USA)
Related Parts
5120-00-156-8609INTERCHANGEABLE
DIE,CRIMPING TOOL
S21
3460-00-189-9132INTERCHANGEABLE
HOLDER,CUTTING TOOL
5130-00-293-1411INTERCHANGEABLE
SOCKET,SOCKET WRENCH
IM302A
1650-00-310-2121INTERCHANGEABLE
FILTERING DISK,FLUID
20020-248-100
4810-00-325-3197INTERCHANGEABLE
SEAT,VALVE
S-21-INTERNAL#0319079
3433-00-355-6243INTERCHANGEABLE
TIP,WELDING TORCH
638948
3110-00-690-8923INTERCHANGEABLE
BEARING,ROLLER,TAPERED
LM501349-LM501310
9905-00-721-8291INTERCHANGEABLE
SIGN,TRAFFIC
S2-1B
4730-01-128-5241INTERCHANGEABLE
STRAINER ELEMENT,SEDIMENT
20020-325-100
4730-01-130-5476INTERCHANGEABLE
STRAINER ELEMENT,SEDIMENT
S21-355-100
4730-01-158-8417INTERCHANGEABLE
ADAPTER,STRAIGHT,PIPE TO HOSE
082-0233-02-0
5895-01-469-9045INTERCHANGEABLE
MONITOR,AUDIO FREQUENCY
S21

Frequently Asked Questions

What is NSN 6680-00-053-3961?

NSN 6680-00-053-3961 is a Plug,sight, manufactured by Eaton Aerospace Llc Div Fluid and Electrical Distribution Division, classified under FSC 6680 (No Item Name Available). Status: active.

What are the part numbers for NSN 6680-00-053-3961?

NSN 6680-00-053-3961 has 2 cross-referenced part numbers: S21 (Satair A/s), S21 (Eaton Aerospace Llc Div Fluid and Electrical Distribution Division).

What NSN replaces 6680-00-053-3961?

There are 12 known substitutes for 6680-00-053-3961: 5120-00-156-8609, 3460-00-189-9132, 5130-00-293-1411 and 9 more. Verify interchangeability with system specifications before substitution.

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