PartsTable TECHNICAL DATA SHEET
NSN 4730-00-502-8978Government record, cited

Union, Tube4730-00-502-8978

NSN 4730-00-502-8978 · NIIN 005028978 · Part number AS1251K08
Sae International Dba Sae International · FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings · FSG 47 — Pipe, Tubing, Hose, and Fittings · CAGE 0U583
Government record, cited
NSN 4730-00-502-8978 — this item is cataloged by the U.S. Government under National Stock Number 4730-00-502-8978. Manufacturer of record part number: AS1251K08.
Also searched as  4730-00-502-8978 · 4730005028978 · NIIN 005028978 · 00-502-8978 · FSC 4730 Hose, Pipe, Tube, Lubrication, and Railing Fittings · CAGE 0U583 · AS1251K08 · SAE-AS1251 · KC126C8 · KC126K8
Nearby stock numbers  ·
Features
  • Union,tube — FSC 4730
  • Connection Style: FLARED (TUBE) FIRST END
  • Nominal Overall Length: 1.562 INCHES IN
  • Connection Type: THREADED EXTERNAL TUBE FIRST END
  • Style Designator: FLARED W/ CENTER WRENCHING FACILITY
  • Material Document and Classification: QQ-S-763,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
  • Nominal Outside Diameter Tube Accommodated: 0.500 INCHES FIRST END IN
  • Nominal Thread Size: 0.750 INCHES FIRST END IN
Identification
  • NSN: 4730-00-502-8978
  • NIIN: 005028978
  • FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
  • FSG: 47 — Pipe, Tubing, Hose, and Fittings
  • Primary part number: AS1251K08
  • Manufacturer: Sae International Dba Sae International
General Description

The Union,tube, cataloged under National Stock Number 4730-00-502-8978, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-00-502-8978
Primary Part NumberAS1251K08
Item NameUnion,tube
FSC / FSG4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
ManufacturerSae International Dba Sae International
StatusACTIVE
Connection StyleFLARED (TUBE) FIRST END
Nominal Overall Length1.562 INCHES IN
Connection TypeTHREADED EXTERNAL TUBE FIRST END
Style DesignatorFLARED W/ CENTER WRENCHING FACILITY
Material Document and ClassificationQQ-S-763,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Nominal Outside Diameter Tube Accommodated0.500 INCHES FIRST END IN
Nominal Thread Size0.750 INCHES FIRST END IN
Seat Angle37.0 DEGREES FIRST END
Surface TreatmentPASSIVATE INSIDE
Surface TreatmentPASSIVATE OUTSIDE
Thread Class3A FIRST END A
MaterialSTEEL COMP 316 OVERALL
Thread Series DesignatorUNF FIRST END
Lifecycle & Compliance
Acquisition StatusACTIVE
DEMIL CodeDEMIL A — No Demilitarization Required
HazardNo hazard code in the DLA record (HMIC N)
Criticality CodeX
⇄ Related Items 9
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4730-00-502-8979AS1251K06 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-00-502-8980AS1251K04 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-01-010-9041AS1251K24 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-01-011-2278AS1251K20 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-01-011-2279AS1251K10 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-01-086-5730AS1251K28 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-01-098-5173AS1251K32 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-01-579-1969AS1251D10 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
4730-01-580-4696AS1251D06 POSSIBLE MATCH
UNION,TUBE
Possible match (shared part number)Sae International Dba Sae International
Cross-Reference Index
Part NumberManufacturer
AS1251K08 PRIMARY Sae International Dba Sae International (USA)
Reference documents
ReferenceMeaning
SAE-AS1251 3/1 Design control — primary reference
Sae International Dba Sae International
AS1251K08 3/9 Design control — primary reference
U.S. Government activity
KC126C8 C/1 Advisory reference — outside the item-of-supply concept
John F Kennedy Space Center Dba Nasa Div Kennedy Space Center
KC126K8 C/1 Advisory reference — outside the item-of-supply concept
John F Kennedy Space Center Dba Nasa Div Kennedy Space Center
Related Parts
4730-00-502-8979POSSIBLE MATCH
UNION,TUBE
AS1251K06
4730-00-502-8980POSSIBLE MATCH
UNION,TUBE
AS1251K04
4730-01-010-9041POSSIBLE MATCH
UNION,TUBE
AS1251K24
4730-01-011-2278POSSIBLE MATCH
UNION,TUBE
AS1251K20
4730-01-011-2279POSSIBLE MATCH
UNION,TUBE
AS1251K10
4730-01-086-5730POSSIBLE MATCH
UNION,TUBE
AS1251K28
4730-01-098-5173POSSIBLE MATCH
UNION,TUBE
AS1251K32
4730-01-579-1969POSSIBLE MATCH
UNION,TUBE
AS1251D10
4730-01-580-4696POSSIBLE MATCH
UNION,TUBE
AS1251D06

Frequently Asked Questions

What is NSN 4730-00-502-8978?

NSN 4730-00-502-8978 is a Union,tube, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.

What part numbers are listed for NSN 4730-00-502-8978?

NSN 4730-00-502-8978 has 1 manufacturer part number on file: AS1251K08 (Sae International Dba Sae International).

What NSN replaces 4730-00-502-8978?

9 possible matches (shared part number, not a government interchangeability claim): 4730-00-502-8979, 4730-00-502-8980, 4730-01-010-9041. Verify interchangeability with system specifications before substitution.

What are the specifications of AS1251K08?

Key specifications for AS1251K08: Connection Style: FLARED (TUBE) FIRST END; Nominal Overall Length: 1.562 INCHES IN; Connection Type: THREADED EXTERNAL TUBE FIRST END; Style Designator: FLARED W/ CENTER WRENCHING FACILITY. 13 specifications are documented in the U.S. Government catalog.

Is NSN 4730-00-502-8978 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.
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