PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ET6MMKey,socket Head Screw

Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc · NSN 5120-01-644-3443 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-644-3443 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-644-3443. Primary manufacturer part number: ET6MM.
Features
  • Key,socket Head Screw — FSC 5120
  • Features Provided: SHORT SERIES
  • Style Designator: L-HANDLE
  • Long Arm Length: 3.460 INCHES NOMINAL IN
  • Short Arm Length: 1.220 INCHES NOMINAL IN
  • Surface Treatment: OXIDE OVERALL
  • Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL
  • Material: STEEL OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-01-644-3443, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-01-644-3443
Primary Part NumberET6MM
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerIdsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
StatusCANCELLED
Features ProvidedSHORT SERIES
Style DesignatorL-HANDLE
Long Arm Length3.460 INCHES NOMINAL IN
Short Arm Length1.220 INCHES NOMINAL IN
Surface TreatmentOXIDE OVERALL
Wrenching Surface ShapeHEXAGON BOTH ENDS EXTERNAL
MaterialSTEEL OVERALL
Wrenching Surface Size6.0 MILLIMETERS NOMINAL BOTH ENDS MM
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 10
5940-00-150-451715512 INTERCHANGEABLE
Terminal Board
Keystone Electronics Corp
5330-00-247-86405282693 INTERCHANGEABLE
Gasket
U S Army Tank Automotive Command Amsta-Im-Mm
6680-00-279-852615512 INTERCHANGEABLE
Indicator,sight,liquid
Gits Mfg Co Inc
6145-00-295-0834 INTERCHANGEABLE
Wire,electrical
2530-00-351-1975188-5333 INTERCHANGEABLE
Track Shoe,vehicular
Caterpillar Inc Div Caterpillar Defense
5950-00-431-31989100-1630 INTERCHANGEABLE
Coil,radio Frequency
Keysight Technologies Inc
4730-01-023-8368 INTERCHANGEABLE
Flange,pipe
4820-01-124-396215512 INTERCHANGEABLE
Valve,insert
Dana Commercial Vehicle Products, Llc
5340-01-139-6391 INTERCHANGEABLE
Clamp,loop
4010-01-619-882515512 INTERCHANGEABLE
Chain,stud Link
Perfection Chain Products Inc Dba Acme Manufacturing
Cross-Reference Index
Part NumberManufacturer
B18.3.2M The American Society of Mechanical Engineers (USA)
FRS ET6MM Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
ET6MM PRIMARY Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
15512 PRIMARY Eklind Tool Co (USA)
Related Parts
5940-00-150-4517INTERCHANGEABLE
TERMINAL BOARD
15512
5330-00-247-8640INTERCHANGEABLE
GASKET
5282693
6680-00-279-8526INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
15512
6145-00-295-0834INTERCHANGEABLE
WIRE,ELECTRICAL
2530-00-351-1975INTERCHANGEABLE
TRACK SHOE,VEHICULAR
188-5333
5950-00-431-3198INTERCHANGEABLE
COIL,RADIO FREQUENCY
9100-1630
4730-01-023-8368INTERCHANGEABLE
FLANGE,PIPE
4820-01-124-3962INTERCHANGEABLE
VALVE,INSERT
15512
5340-01-139-6391INTERCHANGEABLE
CLAMP,LOOP
4010-01-619-8825INTERCHANGEABLE
CHAIN,STUD LINK
15512

Frequently Asked Questions

What is NSN 5120-01-644-3443?

NSN 5120-01-644-3443 is a Key,socket Head Screw, manufactured by Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc, classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-01-644-3443?

NSN 5120-01-644-3443 has 4 cross-referenced part numbers: B18.3.2M (The American Society of Mechanical Engineers), FRS ET6MM (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc), ET6MM (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc), 15512 (Eklind Tool Co).

What NSN replaces 5120-01-644-3443?

There are 10 known substitutes for 5120-01-644-3443: 5940-00-150-4517, 5330-00-247-8640, 6680-00-279-8526 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of ET6MM?

Key specifications for ET6MM: Features Provided: SHORT SERIES; Style Designator: L-HANDLE; Long Arm Length: 3.460 INCHES NOMINAL IN; Short Arm Length: 1.220 INCHES NOMINAL IN. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-01-644-3443 still in active supply?

NSN 5120-01-644-3443 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com