PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-S-20166Beam,structural

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 9520-00-277-4463 · FSC 9520 · No Item Name Available
Verified by PartsTable
NSN 9520-00-277-4463 — this item is cataloged by the U.S. Government under National Stock Number 9520-00-277-4463. Primary manufacturer part number: MIL-S-20166.
Features
  • Beam,structural — FSC 9520
  • Heat Treatment: AS FABRICATED
  • Weight Per Unit Measure: 17.250 POUNDS PER LINEAR FOOT LBS
  • Bottom Flange Width: 3.375 INCHES NOMINAL IN
  • Top Flange Width: 3.375 INCHES NOMINAL IN
  • Material: STEEL UNS K02102
  • Length: 20.000 FEET MINIMUM AND 40.000 FEET MAXIMUM FT
  • Material Document and Classification: MIL-S-22698, GRADE A MIL SPEC SINGLE MATERIAL RESPONSE
Applications
  • Applications requiring Steel Uns K02102 construction
General Description

The Beam,structural, cataloged under National Stock Number 9520-00-277-4463, is classified within Federal Supply Class 9520 (No Item Name Available) of the Metal Bars, Sheets, and Shapes group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, 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
NSN9520-00-277-4463
Primary Part NumberMIL-S-20166
Item NameBeam,structural
FSC / FSG9520 / 95 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Heat TreatmentAS FABRICATED
Weight Per Unit Measure17.250 POUNDS PER LINEAR FOOT LBS
Bottom Flange Width3.375 INCHES NOMINAL IN
Top Flange Width3.375 INCHES NOMINAL IN
MaterialSTEEL UNS K02102
Length20.000 FEET MINIMUM AND 40.000 FEET MAXIMUM FT
Material Document and ClassificationMIL-S-22698, GRADE A MIL SPEC SINGLE MATERIAL RESPONSE
Nondefinitive Spec/std DataA GRADE
Basic Shape StyleI SHAPE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5925-00-113-5066 INTERCHANGEABLE
Circuit Breaker
9510-00-126-1014 INTERCHANGEABLE
Bar,metal
9520-00-277-4438 INTERCHANGEABLE
Channel,structural
9520-00-277-4441 INTERCHANGEABLE
Channel,structural
9520-00-277-4457 INTERCHANGEABLE
Beam,structural
9520-00-277-4459 INTERCHANGEABLE
Beam,structural
9520-00-277-4460 INTERCHANGEABLE
Beam,structural
9520-00-277-4461 INTERCHANGEABLE
Beam,structural
9520-00-277-4462 INTERCHANGEABLE
Beam,structural
9520-00-277-4944 INTERCHANGEABLE
Angle,structural
Cross-Reference Index
Part NumberManufacturer
MIL-S-20166 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-S-22698 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
ABS RULES American Bureau of Shipping (USA)
Related Parts
5925-00-113-5066INTERCHANGEABLE
CIRCUIT BREAKER
9510-00-126-1014INTERCHANGEABLE
BAR,METAL
9520-00-277-4438INTERCHANGEABLE
CHANNEL,STRUCTURAL
9520-00-277-4441INTERCHANGEABLE
CHANNEL,STRUCTURAL
9520-00-277-4457INTERCHANGEABLE
BEAM,STRUCTURAL
9520-00-277-4459INTERCHANGEABLE
BEAM,STRUCTURAL
9520-00-277-4460INTERCHANGEABLE
BEAM,STRUCTURAL
9520-00-277-4461INTERCHANGEABLE
BEAM,STRUCTURAL
9520-00-277-4462INTERCHANGEABLE
BEAM,STRUCTURAL
9520-00-277-4944INTERCHANGEABLE
ANGLE,STRUCTURAL
9520-00-277-4959INTERCHANGEABLE
ANGLE,STRUCTURAL
9520-00-277-5949INTERCHANGEABLE
CHANNEL,STRUCTURAL

Frequently Asked Questions

What is NSN 9520-00-277-4463?

NSN 9520-00-277-4463 is a Beam,structural, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 9520 (No Item Name Available). Status: active.

What are the part numbers for NSN 9520-00-277-4463?

NSN 9520-00-277-4463 has 3 cross-referenced part numbers: MIL-S-20166 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-S-22698 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), ABS RULES (American Bureau of Shipping).

What NSN replaces 9520-00-277-4463?

There are 12 known substitutes for 9520-00-277-4463: 5925-00-113-5066, 9510-00-126-1014, 9520-00-277-4438 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-S-20166?

Key specifications for MIL-S-20166: Heat Treatment: AS FABRICATED; Weight Per Unit Measure: 17.250 POUNDS PER LINEAR FOOT LBS; Bottom Flange Width: 3.375 INCHES NOMINAL IN; Top Flange Width: 3.375 INCHES NOMINAL IN. 10 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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