PartsTable TECHNICAL DATA SHEET
OCTOBER 2026Technical Data Sheet

P57242-B31110-10Sight,day-Night

Flir Systems, Inc · NSN 1240-01-694-2491 · FSC 1240 · No Item Name Available
Verified by PartsTable
NSN 1240-01-694-2491 — this item is cataloged by the U.S. Government under National Stock Number 1240-01-694-2491. Primary manufacturer part number: P57242-B31110-10.
Features
  • Sight,day-Night — FSC 1240
  • Magnification Type: VARIABLE
  • Objective Aperture Diameter: 91.0 MILLIMETERS NOMINAL MM
  • Magnification: 4 MINIMUM
  • View Angle in Deg: 7.1 HORIZONTAL
  • 1 verified cross-reference
  • Primary manufacturer: Flir Systems, Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Sight,day-Night, cataloged under National Stock Number 1240-01-694-2491, is classified within Federal Supply Class 1240 (No Item Name Available) of the Fire Control Equipment group. The primary manufacturer of record is Flir Systems, Inc. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the government interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN1240-01-694-2491
Primary Part NumberP57242-B31110-10
Item NameSight,day-Night
FSC / FSG1240 / 12 — No Item Name Available
ManufacturerFlir Systems, Inc
StatusACTIVE
Magnification TypeVARIABLE
Objective Aperture Diameter91.0 MILLIMETERS NOMINAL MM
Magnification4 MINIMUM
View Angle in Deg7.1 HORIZONTAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
⇄ Verified Substitutes 8
1240-00-764-47347644734 SAME_FSC
Sunshade
No Item Name Available
1240-01-068-667612266931 SAME_FSC
Holder,optical Element
1240-01-082-884934433 SAME_FSC
Sight,infinity
No Item Name Available
No Item Name Available
No Item Name Available
Collimator,infinity Aiming Refer
Cross-Reference Index
Part NumberManufacturer
P57242-B31110-10 PRIMARY Flir Systems, Inc (USA)
Related Parts
1240-00-764-4734INTERCHANGEABLE
SUNSHADE
7644734
1240-00-987-5071INTERCHANGEABLE
NO ITEM NAME AVAILABLE
1240-01-068-6676INTERCHANGEABLE
HOLDER,OPTICAL ELEMENT
12266931
1240-01-082-8849INTERCHANGEABLE
SIGHT,INFINITY
34433
1240-01-090-0609INTERCHANGEABLE
NO ITEM NAME AVAILABLE
1240-01-102-4266INTERCHANGEABLE
NO ITEM NAME AVAILABLE
1240-01-110-9897INTERCHANGEABLE
NO ITEM NAME AVAILABLE
1240-01-361-6090INTERCHANGEABLE
COLLIMATOR,INFINITY AIMING REFER

Frequently Asked Questions

What is NSN 1240-01-694-2491?

NSN 1240-01-694-2491 is a Sight,day-Night, manufactured by Flir Systems, Inc, classified under FSC 1240 (No Item Name Available). Status: active.

What are the part numbers for NSN 1240-01-694-2491?

NSN 1240-01-694-2491 has 1 cross-referenced part number: P57242-B31110-10 (Flir Systems, Inc).

What NSN replaces 1240-01-694-2491?

There are 8 known substitutes for 1240-01-694-2491: 1240-00-764-4734, 1240-00-987-5071, 1240-01-068-6676 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of P57242-B31110-10?

Key specifications for P57242-B31110-10: Magnification Type: VARIABLE; Special Features: MAGNIFICATION UNITY, FOCUS RANGE 15M TO INFINITY, OUTPUT APERTURE 40 MILLIMETER, IMAGE INTENSIFIER GAIN 75,000 MAX, INTERFACE TTO MIL-STD 1913 DUAL LOCKING LEVERS, MM; Objective Aperture Diameter: 91.0 MILLIMETERS NOMINAL MM; Part Name Assigned by Controlling Agency: DUALBAND UNIVERSAL NIGHT SIGHT. 8 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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