NSN 1660-00-694-4866 · NIIN 006944866 · Part number 110557
Honeywell International Inc. Div Aerospace - Torrance · FSC 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment · FSG 16 — Aircraft Components and Accessories · CAGE 70210
Government record, cited
NSN 1660-00-694-4866 — this item is cataloged by the U.S. Government under National Stock Number 1660-00-694-4866. Manufacturer of record part number: 110557.
Also searched as1660-00-694-4866 ·
1660006944866 ·
NIIN 006944866 ·
00-694-4866 ·
FSC 1660 Aircraft Air Conditioning, Heating, and Pressurizing Equipment · CAGE 70210 · 110557
General Characteristics Item Description: CRES PER MIL-S-7720,COMP 303;1.000 IN. OD BY 0.225 IN. LG O/A BY 0.373IN. BODY OD BY 0.140 BODY LG BY 0.250-56 NS-3B THD COUNTERSINK ON BODY END 90.0 DEG BY 0.255 IN. DIA BY COUNTERBORE ON FLANGE END 0.3825 IN. DIA BY 0.039 IN. DEEP;FOUR 0.117 IN. DIA HOLES THRU ON 0.719 IN. DIA BOLT CIRCLE IN
2 manufacturer part numbers on file
Manufacturer of record: Honeywell International Inc. Div Aerospace - Torrance
Identification
NSN: 1660-00-694-4866
NIIN: 006944866
FSC: 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment
FSG: 16 — Aircraft Components and Accessories
Primary part number: 110557
Manufacturer: Honeywell International Inc. Div Aerospace - Torrance
General Description
The Retainer,valve Seat, cataloged under National Stock Number 1660-00-694-4866, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is Honeywell International Inc. Div Aerospace - Torrance. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
1660-00-694-4866
Primary Part Number
110557
Item Name
Retainer,valve Seat
FSC / FSG
1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment
Manufacturer
Honeywell International Inc. Div Aerospace - Torrance
Status
ACTIVE
General Characteristics Item Description
CRES PER MIL-S-7720,COMP 303;1.000 IN. OD BY 0.225 IN. LG O/A BY 0.373IN. BODY OD BY 0.140 BODY LG BY 0.250-56 NS-3B THD COUNTERSINK ON BODY END 90.0 DEG BY 0.255 IN. DIA BY COUNTERBORE ON FLANGE END 0.3825 IN. DIA BY 0.039 IN. DEEP;FOUR 0.117 IN. DIA HOLES THRU ON 0.719 IN. DIA BOLT CIRCLE IN
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5950-00-806-3684POSSIBLE MATCH
TRANSFORMER,AUDIO FREQUENCY
Possible match (shared part number)
5365-01-164-1720110557POSSIBLE MATCH
SPACER,SLEEVE
Possible match (shared part number)Meggitt North Hollywood Inc
4710-01-257-8791110557POSSIBLE MATCH
TUBE AND HOSE ASSEMBLY
Possible match (shared part number)Smiths Tubular Systems-Laconia, Inc.
2920-01-544-34848MR3188KPOSSIBLE MATCH
GENERATOR,ENGINE ACCESSORY
Possible match (shared part number)Prestolite Electric Inc
2920-01-547-8454110-557POSSIBLE MATCH
GENERATOR,ENGINE ACCESSORY
Possible match (shared part number)Heil Trailer International, Llc
Honeywell International, Inc Div Aerospace-Tucson (USA)
Reference documents
Reference
Meaning
110557
5/9Secondary reference
Alliedsignal Inc Dba Allied-Signal Aerospace Co
Related Parts
5950-00-806-3684POSSIBLE MATCH
TRANSFORMER,AUDIO FREQUENCY
5365-01-164-1720POSSIBLE MATCH
SPACER,SLEEVE
110557
4710-01-257-8791POSSIBLE MATCH
TUBE AND HOSE ASSEMBLY
110557
2920-01-544-3484POSSIBLE MATCH
GENERATOR,ENGINE ACCESSORY
8MR3188K
2920-01-547-8454POSSIBLE MATCH
GENERATOR,ENGINE ACCESSORY
110-557
Frequently Asked Questions
What is NSN 1660-00-694-4866?
NSN 1660-00-694-4866 is a Retainer,valve Seat, manufactured by Honeywell International Inc. Div Aerospace - Torrance, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
What part numbers are listed for NSN 1660-00-694-4866?
NSN 1660-00-694-4866 has 2 manufacturer part numbers on file: 110557 (Honeywell International Inc. Div Aerospace - Torrance), 110557 (Honeywell International, Inc Div Aerospace-Tucson).
What NSN replaces 1660-00-694-4866?
5 possible matches (shared part number, not a government interchangeability claim): 5950-00-806-3684, 5365-01-164-1720, 4710-01-257-8791. Verify interchangeability with system specifications before substitution.
What are the specifications of 110557?
Key specifications for 110557: General Characteristics Item Description: CRES PER MIL-S-7720,COMP 303;1.000 IN. OD BY 0.225 IN. LG O/A BY 0.373IN. BODY OD BY 0.140 BODY LG BY 0.250-56 NS-3B THD COUNTERSINK ON BODY END 90.0 DEG BY 0.255 IN. DIA BY COUNTERBORE ON FLANGE END 0.3825 IN. DIA BY 0.039 IN. DEEP;FOUR 0.117 IN. DIA HOLES THRU ON 0.719 IN. DIA BOLT CIRCLE IN. 1 specification is documented in the U.S. Government catalog.
Is NSN 1660-00-694-4866 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.