PartsTable TECHNICAL DATA SHEET
OCTOBER 2026Technical Data Sheet

82A5027A1529Retainer,optical Element

Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service · NSN 1240-01-173-9839 · FSC 1240 · No Item Name Available
Verified by PartsTable
NSN 1240-01-173-9839 — this item is cataloged by the U.S. Government under National Stock Number 1240-01-173-9839. Primary manufacturer part number: 82A5027A1529.
Features
  • Retainer,optical Element — FSC 1240
  • Material: ALUMINUM ALLOY 6061
  • Material Document and Classification: WW-T-700/6, T6, TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE
  • Style Designator: RECESSED
  • Recess Diameter: 35.8 MILLIMETERS NOMINAL MM
  • Drive Type: DRILLED HOLE
  • Hole or Slot Quantity: 1
  • Recess Depth: 2.9 MILLIMETERS NOMINAL MM
Applications
  • Applications requiring Aluminum Alloy 6061 construction
General Description

The Retainer,optical Element, cataloged under National Stock Number 1240-01-173-9839, is classified within Federal Supply Class 1240 (No Item Name Available) of the Fire Control Equipment group. The primary manufacturer of record is Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System. This item has 3 commercial cross-references from 3 manufacturers, 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
NSN1240-01-173-9839
Primary Part Number82A5027A1529
Item NameRetainer,optical Element
FSC / FSG1240 / 12 — No Item Name Available
ManufacturerMarine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service
StatusACTIVE
MaterialALUMINUM ALLOY 6061
Material Document and ClassificationWW-T-700/6, T6, TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE
Style DesignatorRECESSED
Recess Diameter35.8 MILLIMETERS NOMINAL MM
Drive TypeDRILLED HOLE
Hole or Slot Quantity1
Recess Depth2.9 MILLIMETERS NOMINAL MM
Thread Size1.687 IN.-32 IN
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
82A5027A1529 PRIMARY Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service (USA)
82A5027A1529 L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division (USA)
82A5027A1529 Seiler Instrument and Manufacturing Company, Incorporated (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 1240-01-173-9839?

NSN 1240-01-173-9839 is a Retainer,optical Element, manufactured by Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service, classified under FSC 1240 (No Item Name Available). Status: active.

What are the part numbers for NSN 1240-01-173-9839?

NSN 1240-01-173-9839 has 3 cross-referenced part numbers: 82A5027A1529 (Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service), 82A5027A1529 (L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division), 82A5027A1529 (Seiler Instrument and Manufacturing Company, Incorporated).

What NSN replaces 1240-01-173-9839?

There are 8 known substitutes for 1240-01-173-9839: 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 82A5027A1529?

Key specifications for 82A5027A1529: Material: ALUMINUM ALLOY 6061; Material Document and Classification: WW-T-700/6, T6, TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE; Style Designator: RECESSED; Recess Diameter: 35.8 MILLIMETERS NOMINAL MM. 9 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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