PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

10991Chain,weldless

W R Systems Ltd Dba Alert · NSN 4010-00-186-9381 · FSC 4010 · No Item Name Available
Verified by PartsTable
NSN 4010-00-186-9381 — this item is cataloged by the U.S. Government under National Stock Number 4010-00-186-9381. Primary manufacturer part number: 10991.
Features
  • Chain,weldless — FSC 4010
  • Style Designator: DOUBLE JACK
  • Nondefinitive Spec/std Data: 2 TYPE AND 8 CLASS AND 18 SIZE
  • Material: COPPER ALLOY OVERALL
  • Material: COPPER ALLOY OVERALL
  • Breaking Strength: 0.000 HARNESS GROUP 2
  • Style Designator: DOUBLE JACK
  • Diameter: 0.048 INCHES NOMINAL STOCK IN
Applications
  • Applications requiring Copper Alloy Overall construction
General Description

The Chain,weldless, cataloged under National Stock Number 4010-00-186-9381, is classified within Federal Supply Class 4010 (No Item Name Available) of the Rope, Cable, Chain, and Fittings group. The primary manufacturer of record is W R Systems Ltd Dba Alert. Government technical data includes 8 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. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4010-00-186-9381
Primary Part Number10991
Item NameChain,weldless
FSC / FSG4010 / 40 — No Item Name Available
ManufacturerW R Systems Ltd Dba Alert
StatusACTIVE
Style DesignatorDOUBLE JACK
Nondefinitive Spec/std Data2 TYPE AND 8 CLASS AND 18 SIZE
MaterialCOPPER ALLOY OVERALL
MaterialCOPPER ALLOY OVERALL
Breaking Strength0.000 HARNESS GROUP 2
Style DesignatorDOUBLE JACK
Diameter0.048 INCHES NOMINAL STOCK IN
Nondefinitive Spec/std Data2 TYPE AND 8 CLASS AND 18 SIZE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
5120-00-072-20961099-1 INTERCHANGEABLE
Adapter
Aerocontrolex Group, Inc. Div Talley Actuators
4720-00-518-6757F3700 INTERCHANGEABLE
Hose Assembly,nonmetallic
Federal Mogul Corp Sub Wagner Brake Moog Automotive Div
5961-00-581-970010515163 INTERCHANGEABLE
Semiconductor Device,diode
Us Army Aviation and Missile Command
5950-00-938-5281SM-C-416326 INTERCHANGEABLE
Transformer,power
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
4320-01-112-6660 INTERCHANGEABLE
Seal Assembly,shaft,spring Loade
4730-01-465-2405 INTERCHANGEABLE
Tee,flange to Pipe
5340-01-496-40551099-1 INTERCHANGEABLE
Bracket,angle
Tru-Hitch, Inc.
6550-01-553-739310-991 INTERCHANGEABLE
Test Kit,glucose Determination
Cholestech Corporation
5325-01-601-694710991A INTERCHANGEABLE
Ring,retaining
Harley Davidson Motor Co Inc
Cross-Reference Index
Part NumberManufacturer
RRC271 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
10991 PRIMARY W R Systems Ltd Dba Alert (USA)
Related Parts
5120-00-072-2096INTERCHANGEABLE
ADAPTER
1099-1
4720-00-518-6757INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
F3700
5961-00-581-9700INTERCHANGEABLE
SEMICONDUCTOR DEVICE,DIODE
10515163
5950-00-938-5281INTERCHANGEABLE
TRANSFORMER,POWER
SM-C-416326
4320-01-112-6660INTERCHANGEABLE
SEAL ASSEMBLY,SHAFT,SPRING LOADE
4730-01-465-2405INTERCHANGEABLE
TEE,FLANGE TO PIPE
5340-01-496-4055INTERCHANGEABLE
BRACKET,ANGLE
1099-1
6550-01-553-7393INTERCHANGEABLE
TEST KIT,GLUCOSE DETERMINATION
10-991
5325-01-601-6947INTERCHANGEABLE
RING,RETAINING
10991A

Frequently Asked Questions

What is NSN 4010-00-186-9381?

NSN 4010-00-186-9381 is a Chain,weldless, manufactured by W R Systems Ltd Dba Alert, classified under FSC 4010 (No Item Name Available). Status: active.

What are the part numbers for NSN 4010-00-186-9381?

NSN 4010-00-186-9381 has 2 cross-referenced part numbers: RRC271 (Federal Specifications Promulgated by General Services Administration Washington DC), 10991 (W R Systems Ltd Dba Alert).

What NSN replaces 4010-00-186-9381?

There are 9 known substitutes for 4010-00-186-9381: 5120-00-072-2096, 4720-00-518-6757, 5961-00-581-9700 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 10991?

Key specifications for 10991: Style Designator: DOUBLE JACK; Nondefinitive Spec/std Data: 2 TYPE AND 8 CLASS AND 18 SIZE; Material: COPPER ALLOY OVERALL; Material: COPPER ALLOY OVERALL. 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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