PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

3-721Bit,screwdriver

Jensen Tools, Inc. · NSN 5120-01-161-4543 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-161-4543 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-161-4543. Primary manufacturer part number: 3-721.
Features
  • Bit,screwdriver — FSC 5120
  • Width Across Flats: 5.0 MILLIMETERS NOMINAL MM
  • Tip Type: MALE HEXAGONAL
  • Drive Shank Type: MALE STRAIGHT ROUND CENTER, FLATTED ON TWO SIDES
  • 9 verified cross-references
  • Primary manufacturer: Jensen Tools, Inc.
Applications
  • Field maintenance and repair
  • Facility maintenance operations
  • General-purpose hand tools
General Description

The Bit,screwdriver, cataloged under National Stock Number 5120-01-161-4543, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Jensen Tools, Inc.. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 9 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-161-4543
Primary Part Number3-721
Item NameBit,screwdriver
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerJensen Tools, Inc.
StatusACTIVE
Width Across Flats5.0 MILLIMETERS NOMINAL MM
Tip TypeMALE HEXAGONAL
Drive Shank TypeMALE STRAIGHT ROUND CENTER, FLATTED ON TWO SIDES
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5330-00-154-49913721 INTERCHANGEABLE
Seal,plain Encased
Schindler Elevator Corporation
2530-00-192-8747 INTERCHANGEABLE
Cylinder,hydraulic Brake,wheel
5315-00-291-8316142167 INTERCHANGEABLE
Pin,straight,headless
Lockheed Martin Corporation Div Rms - Mitchel Field
5120-00-293-21363721 INTERCHANGEABLE
Wrench,open End
Martin Sprocket and Gear Inc
5360-00-360-68993721 INTERCHANGEABLE
Spring,helical,torsion
Sachs-Boge of America
4920-00-435-9609372-1 INTERCHANGEABLE
Detector,voltage,test Set
General Dynamics Ots (aerospace), Inc. Dba General Dynamics Ordinance and Tactical Systems Div Seattle Operations
5995-00-711-67607116760 INTERCHANGEABLE
Cable Assembly,special Purpose,e
Army, United States Department of the Dba Rock Island Arsenal Jmtc
1730-00-786-7347 INTERCHANGEABLE
Repair Kit,bearing,
5998-00-827-2018 INTERCHANGEABLE
Circuit Card Assembly
5950-00-862-94443721 INTERCHANGEABLE
Reactor
Pulse Engineering Inc
Cross-Reference Index
Part NumberManufacturer
142-167 Tool Range Ltd (GBR)
3B721 Jensen Tools, Inc. (USA)
9977MM Apex Tool Group, Llc (USA)
272SC288 Techni-Tool, Inc. (USA)
3-721 PRIMARY Jensen Tools, Inc. (USA)
99-77MM Cooper Tools Ltd (GBR)
L3B721 Jensen Tools, Inc. (USA)
TMT-99-77MM Time Motion Tools Inc (USA)
9977MM Apex Tool Group (USA)
Related Parts
5330-00-154-4991INTERCHANGEABLE
SEAL,PLAIN ENCASED
3721
2530-00-192-8747INTERCHANGEABLE
CYLINDER,HYDRAULIC BRAKE,WHEEL
5315-00-291-8316INTERCHANGEABLE
PIN,STRAIGHT,HEADLESS
142167
5120-00-293-2136INTERCHANGEABLE
WRENCH,OPEN END
3721
5360-00-360-6899INTERCHANGEABLE
SPRING,HELICAL,TORSION
3721
4920-00-435-9609INTERCHANGEABLE
DETECTOR,VOLTAGE,TEST SET
372-1
5995-00-711-6760INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
7116760
1730-00-786-7347INTERCHANGEABLE
REPAIR KIT,BEARING,
5998-00-827-2018INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
5950-00-862-9444INTERCHANGEABLE
REACTOR
3721
4520-00-911-7979INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
5915-00-924-9599INTERCHANGEABLE
FILTER,LOW PASS
372-1

Frequently Asked Questions

What is NSN 5120-01-161-4543?

NSN 5120-01-161-4543 is a Bit,screwdriver, manufactured by Jensen Tools, Inc., classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-161-4543?

NSN 5120-01-161-4543 has 9 cross-referenced part numbers: 142-167 (Tool Range Ltd), 3B721 (Jensen Tools, Inc.), 9977MM (Apex Tool Group, Llc), 272SC288 (Techni-Tool, Inc.), 3-721 (Jensen Tools, Inc.) and 4 more.

What NSN replaces 5120-01-161-4543?

There are 12 known substitutes for 5120-01-161-4543: 5330-00-154-4991, 2530-00-192-8747, 5315-00-291-8316 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 3-721?

Key specifications for 3-721: Width Across Flats: 5.0 MILLIMETERS NOMINAL MM; Overall Length: 5.750 INCHES NOMINAL IN; Tip Type: MALE HEXAGONAL; End Item Identification: COOPER/XCELITE SERIES 99 HANDLES. 5 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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