PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

251-6Inserter,screw Thread Insert

Stanley Engineered Fastening Llc · NSN 5120-00-831-2253 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-831-2253 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-831-2253. Primary manufacturer part number: 251-6.
Features
  • Inserter,screw Thread Insert — FSC 5120
  • Thread Size and Series/type Designator: 3/8-16 UNIFIED NATIONAL COARSE (UNC)
  • Unit Type: MANDREL
  • 3 verified cross-references
  • Primary manufacturer: Stanley Engineered Fastening Llc
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Inserter,screw Thread Insert, cataloged under National Stock Number 5120-00-831-2253, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Stanley Engineered Fastening Llc. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-00-831-2253
Primary Part Number251-6
Item NameInserter,screw Thread Insert
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerStanley Engineered Fastening Llc
StatusACTIVE
Thread Size and Series/type Designator3/8-16 UNIFIED NATIONAL COARSE (UNC)
Unit TypeMANDREL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
3110-00-100-074210611 INTERCHANGEABLE
Cone and Rollers,tapered Roller
Black and Decker Us Inc
5330-00-171-3930 INTERCHANGEABLE
Seal,plain Encased
3120-00-394-6471 INTERCHANGEABLE
Bearing,sleeve
5905-00-491-47492786 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
5905-01-096-36702786 INTERCHANGEABLE
Resistor
Crown Audio, Inc. Dba Crown International
6540-01-549-90554007 INTERCHANGEABLE
Lamp,lens Measuring,ophthalmic
Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart
6530-01-681-51542786 INTERCHANGEABLE
Ultrasonic Apparatus and Muscle
Chattanooga Medical Supply, Inc. Dba Chattanooga Medical Supply
Cross-Reference Index
Part NumberManufacturer
251-6 Stanley Engineered Fastening Llc (USA)
T6-16-8 Stanley Engineered Fastening Llc (USA)
278-6 Stanley Engineered Fastening Llc (USA)
Related Parts
3110-00-100-0742INTERCHANGEABLE
CONE AND ROLLERS,TAPERED ROLLER
10611
5330-00-171-3930INTERCHANGEABLE
SEAL,PLAIN ENCASED
3120-00-394-6471INTERCHANGEABLE
BEARING,SLEEVE
5905-00-491-4749INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
2786
5905-01-096-3670INTERCHANGEABLE
RESISTOR
2786
6540-01-549-9055INTERCHANGEABLE
LAMP,LENS MEASURING,OPHTHALMIC
4007
6530-01-681-5154INTERCHANGEABLE
ULTRASONIC APPARATUS AND MUSCLE
2786

Frequently Asked Questions

What is NSN 5120-00-831-2253?

NSN 5120-00-831-2253 is a Inserter,screw Thread Insert, manufactured by Stanley Engineered Fastening Llc, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-00-831-2253?

NSN 5120-00-831-2253 has 3 cross-referenced part numbers: 251-6 (Stanley Engineered Fastening Llc), T6-16-8 (Stanley Engineered Fastening Llc), 278-6 (Stanley Engineered Fastening Llc).

What NSN replaces 5120-00-831-2253?

There are 7 known substitutes for 5120-00-831-2253: 3110-00-100-0742, 5330-00-171-3930, 3120-00-394-6471 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 251-6?

Key specifications for 251-6: Special Features: OVERALL LG 4.406 IN.,OUTSIDE DIA 0.750 IN; Thread Size and Series/type Designator: 3/8-16 UNIFIED NATIONAL COARSE (UNC); Unit Type: MANDREL. 3 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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