PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

104991Mask,optical Prism

Symetrics Industries, Llc Dba Extant Aerospace Div Symetrics Industries Dba Extant Aerospace · NSN 6610-00-126-6115 · FSC 6610 · No Item Name Available
Verified by PartsTable
NSN 6610-00-126-6115 — this item is cataloged by the U.S. Government under National Stock Number 6610-00-126-6115. Primary manufacturer part number: 104991.
Features
  • Mask,optical Prism — FSC 6610
  • General Characteristics Item Description: BRASS QQ-B-613 COMP E COND 1/2 HARD; 0.020 IN. THK; 0.840 IN. WIDE IN
  • 2 verified cross-references
  • Primary manufacturer: Symetrics Industries, Llc Dba Extant Aerospace Div Symetrics Industries Dba Extant Aerospace
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Mask,optical Prism, cataloged under National Stock Number 6610-00-126-6115, is classified within Federal Supply Class 6610 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Symetrics Industries, Llc Dba Extant Aerospace Div Symetrics Industries Dba Extant Aerospace. Government technical data includes 1 verified specification, 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
NSN6610-00-126-6115
Primary Part Number104991
Item NameMask,optical Prism
FSC / FSG6610 / 66 — No Item Name Available
ManufacturerSymetrics Industries, Llc Dba Extant Aerospace Div Symetrics Industries Dba Extant Aerospace
StatusACTIVE
General Characteristics Item DescriptionBRASS QQ-B-613 COMP E COND 1/2 HARD; 0.020 IN. THK; 0.840 IN. WIDE IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
3110-00-156-7932314747-1 INTERCHANGEABLE
Bearing,ball,annular
Timken Co Div the Timken Company
5305-00-527-3918104991 INTERCHANGEABLE
Screw,machine
Lucent Technologies Inc Corporate Headquarters
4130-01-175-1244104991 INTERCHANGEABLE
Dasher,ice Cream Machine
M D Holdings Llc Dba Saniserv
Cross-Reference Index
Part NumberManufacturer
104991 Astronautics Corporation of America (USA)
104991 PRIMARY Symetrics Industries, Llc Dba Extant Aerospace Div Symetrics Industries Dba Extant Aerospace (USA)
Related Parts
3110-00-156-7932INTERCHANGEABLE
BEARING,BALL,ANNULAR
314747-1
5305-00-527-3918INTERCHANGEABLE
SCREW,MACHINE
104991
4130-01-175-1244INTERCHANGEABLE
DASHER,ICE CREAM MACHINE
104991

Frequently Asked Questions

What is NSN 6610-00-126-6115?

NSN 6610-00-126-6115 is a Mask,optical Prism, manufactured by Symetrics Industries, Llc Dba Extant Aerospace Div Symetrics Industries Dba Extant Aerospace, classified under FSC 6610 (No Item Name Available). Status: active.

What are the part numbers for NSN 6610-00-126-6115?

NSN 6610-00-126-6115 has 2 cross-referenced part numbers: 104991 (Astronautics Corporation of America), 104991 (Symetrics Industries, Llc Dba Extant Aerospace Div Symetrics Industries Dba Extant Aerospace).

What NSN replaces 6610-00-126-6115?

There are 3 known substitutes for 6610-00-126-6115: 3110-00-156-7932, 5305-00-527-3918, 4130-01-175-1244. Verify interchangeability with system specifications before substitution.

What are the specifications of 104991?

Key specifications for 104991: General Characteristics Item Description: BRASS QQ-B-613 COMP E COND 1/2 HARD; 0.020 IN. THK; 0.840 IN. WIDE IN. 1 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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