PartsTable TECHNICAL DATA SHEET
AUGUST 2026Technical Data Sheet

QQS561CLASS4Brazing Alloy,silver

Federal Specifications Promulgated by General Services Administration Washington DC · NSN 3439-00-184-8952 · FSC 3439 · No Item Name Available
Verified by PartsTable
NSN 3439-00-184-8952 — this item is cataloged by the U.S. Government under National Stock Number 3439-00-184-8952. Primary manufacturer part number: QQS561CLASS4.
Features
  • Brazing Alloy,silver — FSC 3439
  • Content Within Each Unit Package: 1 TROY OZ
  • Content Within Each Unit Package: 1 TROY OZ
  • Precious Material: SILVER
  • Flux Feature: NOT INCLUDED
  • Precious Material and Weight: 0.510 SILVER OUNCES, TROY
  • Precious Material and Location: INTEGRAL SILVER
  • Chemical Composition Percentage: SILVER 51; COPPER 16.5; ZINC 18.5; CADMIUM 19; OTHERS 0.15
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Brazing Alloy,silver, cataloged under National Stock Number 3439-00-184-8952, is classified within Federal Supply Class 3439 (No Item Name Available) of the Metalworking Machinery (continued) group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3439-00-184-8952
Primary Part NumberQQS561CLASS4
Item NameBrazing Alloy,silver
FSC / FSG3439 / 34 — No Item Name Available
ManufacturerFederal Specifications Promulgated by General Services Administration Washington DC
StatusACTIVE
Content Within Each Unit Package1 TROY OZ
Content Within Each Unit Package1 TROY OZ
Precious MaterialSILVER
Flux FeatureNOT INCLUDED
Precious Material and Weight0.510 SILVER OUNCES, TROY
Precious Material and LocationINTEGRAL SILVER
Chemical Composition PercentageSILVER 51; COPPER 16.5; ZINC 18.5; CADMIUM 19; OTHERS 0.15
Physical FormWIRE
Nondefinitive Spec/std Data4 CLASS AND 4 GRADE
Chemical Composition PercentageSILVER 51; COPPER 16.5; ZINC 18.5; CADMIUM 19; OTHERS 0.15
Precious Material and LocationINTEGRAL SILVER
Diameter0.031 INCHES NOMINAL IN
Nondefinitive Spec/std Data4 CLASS AND 4 GRADE
Precious MaterialSILVER
Precious Material and Weight0.510 SILVER OUNCES, TROY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
3439-00-052-1899AWSA5.8-92 BCUP-5-0.063 INTERCHANGEABLE
Brazing Alloy,silver
American Welding Society, Inc.
3439-00-262-4191 INTERCHANGEABLE
Brazing Alloy,silver
3439-00-781-5197 INTERCHANGEABLE
Brazing Alloy,silver
Cross-Reference Index
Part NumberManufacturer
QQS561CLASS4 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
MIL-B-15395 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
3439-00-052-1899INTERCHANGEABLE
BRAZING ALLOY,SILVER
AWSA5.8-92 BCUP-5-0.063
3439-00-262-4191INTERCHANGEABLE
BRAZING ALLOY,SILVER
3439-00-781-5197INTERCHANGEABLE
BRAZING ALLOY,SILVER

Frequently Asked Questions

What is NSN 3439-00-184-8952?

NSN 3439-00-184-8952 is a Brazing Alloy,silver, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 3439 (No Item Name Available). Status: active.

What are the part numbers for NSN 3439-00-184-8952?

NSN 3439-00-184-8952 has 2 cross-referenced part numbers: QQS561CLASS4 (Federal Specifications Promulgated by General Services Administration Washington DC), MIL-B-15395 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 3439-00-184-8952?

There are 3 known substitutes for 3439-00-184-8952: 3439-00-052-1899, 3439-00-262-4191, 3439-00-781-5197. Verify interchangeability with system specifications before substitution.

What are the specifications of QQS561CLASS4?

Key specifications for QQS561CLASS4: Content Within Each Unit Package: 1 TROY OZ; Content Within Each Unit Package: 1 TROY OZ; Precious Material: SILVER; Flux Feature: NOT INCLUDED. 15 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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