PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B1BBoring Bit,belt Fastener

Flexible Steel Lacing Co · NSN 5120-01-349-1704 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-349-1704 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-349-1704. Primary manufacturer part number: B1B.
Features
  • Boring Bit,belt Fastener — FSC 5120
  • Functional Description: USED TO INSTALL FLEXCO NO. 1,140,190,RP1 AND SP6 FASTENERS
  • 1 verified cross-reference
  • Primary manufacturer: Flexible Steel Lacing Co
Applications
  • Field maintenance and repair
  • Facility maintenance operations
  • General-purpose hand tools
General Description

The Boring Bit,belt Fastener, cataloged under National Stock Number 5120-01-349-1704, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Flexible Steel Lacing Co. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-349-1704
Primary Part NumberB1B
Item NameBoring Bit,belt Fastener
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerFlexible Steel Lacing Co
StatusACTIVE
Functional DescriptionUSED TO INSTALL FLEXCO NO. 1,140,190,RP1 AND SP6 FASTENERS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5940-00-138-8827B1B INTERCHANGEABLE
Splice,conductor
Abb Installation Products Inc
5940-00-422-4789B1-1 INTERCHANGEABLE
Splice,conductor
Te Connectivity Corporation
3040-01-350-6314744268-2 INTERCHANGEABLE
Shaft,shouldered
Hamilton Sundstrand Corporation Dba Collins Aerospace
7310-01-386-5572B1B INTERCHANGEABLE
Food Warmer,infra-Red,electric
Merco Products Inc
5999-01-702-2777B1B INTERCHANGEABLE
Contact,electrical
Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution
Cross-Reference Index
Part NumberManufacturer
B1B PRIMARY Flexible Steel Lacing Co (USA)
Related Parts
5940-00-138-8827INTERCHANGEABLE
SPLICE,CONDUCTOR
B1B
5940-00-422-4789INTERCHANGEABLE
SPLICE,CONDUCTOR
B1-1
3040-01-350-6314INTERCHANGEABLE
SHAFT,SHOULDERED
744268-2
7310-01-386-5572INTERCHANGEABLE
FOOD WARMER,INFRA-RED,ELECTRIC
B1B
5999-01-702-2777INTERCHANGEABLE
CONTACT,ELECTRICAL
B1B

Frequently Asked Questions

What is NSN 5120-01-349-1704?

NSN 5120-01-349-1704 is a Boring Bit,belt Fastener, manufactured by Flexible Steel Lacing Co, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-349-1704?

NSN 5120-01-349-1704 has 1 cross-referenced part number: B1B (Flexible Steel Lacing Co).

What NSN replaces 5120-01-349-1704?

There are 5 known substitutes for 5120-01-349-1704: 5940-00-138-8827, 5940-00-422-4789, 3040-01-350-6314 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B1B?

Key specifications for B1B: Functional Description: USED TO INSTALL FLEXCO NO. 1,140,190,RP1 AND SP6 FASTENERS. 1 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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