Surface Treatment Document and Classification: MIL-C-13924 CLASS-4 MIL SPEC SINGLE TREATMENT RESPONSE
Design Form: STRAIGHT
Nominal Overall Length: 6.000 INCHES IN
Wall Thickness: 0.0360 INCHES NOMINAL IN
Nominal Outside Diameter: 11.5000 INCHES IN
Surface Treatment: PRIMER
Identification
NSN: 4520-01-435-7891
NIIN: 014357891
FSC: 4520 — Space and Water Heating Equipment
FSG: 45 — Plumbing, Heating, and Waste Disposal
General Description
The Pipe,exhaust, cataloged under National Stock Number 4520-01-435-7891, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4520-01-435-7891
Item Name
Pipe,exhaust
FSC / FSG
4520 / 45 — Space and Water Heating Equipment
Status
ACTIVE
Furnished Items and Quantity
2 BOLT AND 2 NUT
Surface Treatment Document and Classification
MIL-C-13924 CLASS-4 MIL SPEC SINGLE TREATMENT RESPONSE
Design Form
STRAIGHT
Nominal Overall Length
6.000 INCHES IN
Wall Thickness
0.0360 INCHES NOMINAL IN
Nominal Outside Diameter
11.5000 INCHES IN
Surface Treatment
PRIMER
Material
STEEL COMP 316
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
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
A3245838
3/2Design control — primary reference
U.S. Government activity
No interchangeability data on file.
Other items in FSC 4520 — Space and Water Heating Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4520-00-000-0098
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-000-0099
4520-00-000-0099 · Item name not on file
4520-00-001-1240
4520-00-001-1240 · Item name not on file
4520-00-001-3518
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-3519
HEATING ELEMENT,ELECTRICAL,IMMER
4520-00-001-6052
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-6298
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-7726
HEATER,DUCT TYPE,PORTABLE
Frequently Asked Questions
What is NSN 4520-01-435-7891?
NSN 4520-01-435-7891 is a Pipe,exhaust, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
What are the specifications of 4520-01-435-7891?
Key specifications for 4520-01-435-7891: Furnished Items and Quantity: 2 BOLT AND 2 NUT; Surface Treatment Document and Classification: MIL-C-13924 CLASS-4 MIL SPEC SINGLE TREATMENT RESPONSE; Design Form: STRAIGHT; Nominal Overall Length: 6.000 INCHES IN. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4520-01-435-7891 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.