Material Document and Classification: MIL-P-21143 MIL SPEC SINGLE MATERIAL RESPONSE
Material: STEEL ALLOY
Identification
NSN: 3040-01-138-0344
NIIN: 011380344
FSC: 3040 — Miscellaneous Power Transmission Equipment
FSG: 30 — Mechanical Power Transmission Equipment
General Description
The Shaft,straight, cataloged under National Stock Number 3040-01-138-0344, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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
3040-01-138-0344
Item Name
Shaft,straight
FSC / FSG
3040 / 30 — Miscellaneous Power Transmission Equipment
Status
ACTIVE
Material Document and Classification
MIL-P-21143 MIL SPEC SINGLE MATERIAL RESPONSE
Material
STEEL ALLOY
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 Items6
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3960-01-138-8806SS20,4X2,SN82-1006POSSIBLE MATCH
SHOCK ABSORBER
Possible match (shared part number)Egd Manufacturing Inc
3040-01-138-9038B200669D032POSSIBLE MATCH
SHAFT,GUIDE ROLLER
Possible match (shared part number)Jered Llc
3960-01-139-1723GD-175-XPOSSIBLE MATCH
CLEVIS SOCKET ASSEMBLY
Possible match (shared part number)Pegasus Inc
3020-01-139-1760C1072P395POSSIBLE MATCH
PULLEY,GROOVE
Possible match (shared part number)Jered Llc
3040-01-139-1908B1072P394POSSIBLE MATCH
SHAFT,STRAIGHT
Possible match (shared part number)Jered Llc
3040-01-143-9469B1072P401POSSIBLE MATCH
SHAFT,SHOULDERED
Possible match (shared part number)Jered Llc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
200669-D-001 ITEM 41
5/2Secondary reference
U.S. Government activity
200669-D-001
D/9Drawing number reference only
U.S. Government activity
B1072P540
3/2Design control — primary reference
U.S. Government activity
Related Parts
3960-01-138-8806POSSIBLE MATCH
SHOCK ABSORBER
SS20,4X2,SN82-1006
3040-01-138-9038POSSIBLE MATCH
SHAFT,GUIDE ROLLER
B200669D032
3960-01-139-1723POSSIBLE MATCH
CLEVIS SOCKET ASSEMBLY
GD-175-X
3020-01-139-1760POSSIBLE MATCH
PULLEY,GROOVE
C1072P395
3040-01-139-1908POSSIBLE MATCH
SHAFT,STRAIGHT
B1072P394
3040-01-143-9469POSSIBLE MATCH
SHAFT,SHOULDERED
B1072P401
Frequently Asked Questions
What is NSN 3040-01-138-0344?
NSN 3040-01-138-0344 is a Shaft,straight, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
What NSN replaces 3040-01-138-0344?
6 possible matches (shared part number, not a government interchangeability claim): 3960-01-138-8806, 3040-01-138-9038, 3960-01-139-1723. Verify interchangeability with system specifications before substitution.
What are the specifications of 3040-01-138-0344?
Key specifications for 3040-01-138-0344: Material Document and Classification: MIL-P-21143 MIL SPEC SINGLE MATERIAL RESPONSE; Material: STEEL ALLOY. 2 specifications are documented in the U.S. Government catalog.
Is NSN 3040-01-138-0344 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.