PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21499Flange,pipe

Leslie Controls, Inc. Dba Leslie Controls Inc · NSN 4730-01-185-8137 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-01-185-8137 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-185-8137. Primary manufacturer part number: 21499.
Features
  • Flange,pipe — FSC 4730
  • Material: STEEL
  • Flange Length: 0.438 INCHES NOMINAL IN
  • Material Document and Classification: MIL-S890,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE
  • Flange Diameter: 3.500 INCHES NOMINAL IN
  • 3 verified cross-references
  • Primary manufacturer: Leslie Controls, Inc. Dba Leslie Controls Inc
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Steel construction
General Description

The Flange,pipe, cataloged under National Stock Number 4730-01-185-8137, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-01-185-8137
Primary Part Number21499
Item NameFlange,pipe
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerLeslie Controls, Inc. Dba Leslie Controls Inc
StatusACTIVE
MaterialSTEEL
Flange Length0.438 INCHES NOMINAL IN
Material Document and ClassificationMIL-S890,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE
Flange Diameter3.500 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5930-00-313-3489 INTERCHANGEABLE
Switch,control,ante
3020-00-939-262321499 INTERCHANGEABLE
Gear Cluster
Aerosonic Llc
3040-01-034-357521499 INTERCHANGEABLE
Lever,manual Control
Ward Leonard Ct Llc
4820-01-067-5312N-375 INTERCHANGEABLE
Stem,fluid Valve
Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-067-6517N375-68 INTERCHANGEABLE
Seat,valve
Caltam, Inc
5360-01-127-107721499 INTERCHANGEABLE
Spring
Sterling Spring Llc
1650-01-179-835921499 INTERCHANGEABLE
Cover,hydraulic Valve
Meggitt North Hollywood Inc
4710-01-185-8050B19332-34 INTERCHANGEABLE
Pipe,metallic
Leslie Controls, Inc. Dba Leslie Controls Inc
4730-01-185-8184N-375-10 INTERCHANGEABLE
Flange,pipe
Leslie Controls, Inc. Dba Leslie Controls Inc
4730-01-185-8185999-N-375 INTERCHANGEABLE
Bridge,inlet,strainer
W. & O. Supply, Inc. Div W&o Norfolk
Cross-Reference Index
Part NumberManufacturer
21499 PRIMARY Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
N-375 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
N-375 PIECE 77 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
Related Parts
5930-00-313-3489INTERCHANGEABLE
SWITCH,CONTROL,ANTE
3020-00-939-2623INTERCHANGEABLE
GEAR CLUSTER
21499
3040-01-034-3575INTERCHANGEABLE
LEVER,MANUAL CONTROL
21499
4820-01-067-5312INTERCHANGEABLE
STEM,FLUID VALVE
N-375
4820-01-067-6517INTERCHANGEABLE
SEAT,VALVE
N375-68
5360-01-127-1077INTERCHANGEABLE
SPRING
21499
1650-01-179-8359INTERCHANGEABLE
COVER,HYDRAULIC VALVE
21499
4710-01-185-8050INTERCHANGEABLE
PIPE,METALLIC
B19332-34
4730-01-185-8184INTERCHANGEABLE
FLANGE,PIPE
N-375-10
4730-01-185-8185INTERCHANGEABLE
BRIDGE,INLET,STRAINER
999-N-375
4730-01-185-8186INTERCHANGEABLE
HANDLE,STRAINER BASKET
N-375 PIECE 41
4730-01-186-6051INTERCHANGEABLE
BONNET,STRAINER VALVE
N-375-69

Frequently Asked Questions

What is NSN 4730-01-185-8137?

NSN 4730-01-185-8137 is a Flange,pipe, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-01-185-8137?

NSN 4730-01-185-8137 has 3 cross-referenced part numbers: 21499 (Leslie Controls, Inc. Dba Leslie Controls Inc), N-375 (Leslie Controls, Inc. Dba Leslie Controls Inc), N-375 PIECE 77 (Leslie Controls, Inc. Dba Leslie Controls Inc).

What NSN replaces 4730-01-185-8137?

There are 12 known substitutes for 4730-01-185-8137: 5930-00-313-3489, 3020-00-939-2623, 3040-01-034-3575 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21499?

Key specifications for 21499: Material: STEEL; Flange Length: 0.438 INCHES NOMINAL IN; Material Document and Classification: MIL-S890,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE; Flange Diameter: 3.500 INCHES NOMINAL IN. 4 total characteristics are documented in the Federal Logistics Information System.

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