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BACK20B1 — BACK20B1

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

BACK20B1: BACK20B1.

The BACK20B1 is a the manufacturer industrial component. Key specifications include shank_style: CONCAVE, overall_depth: 0.310 INCHES NOMINAL IN, shank_diameter: 0.310 INCHES NOMINAL IN, inside_diameter: 0.138 INCHES NOMINAL IN, outside_diameter: 0.750 INCHES NOMINAL IN, style_designator: CROWN. This part is cataloged in the U.S.

Government catalog under NSN 5355-01-048-9911, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
BACK20B1
NSN: 5355-01-048-9911
FSC: 5355 — Knobs and Pointers
CAGE: 17765 — THE BOEING COMPANY DIV COMMERCIAL (USA)
SPECIFICATIONS
shank_styleCONCAVE
overall_depth0.310 INCHES NOMINAL IN
shank_diameter0.310 INCHES NOMINAL IN
inside_diameter0.138 INCHES NOMINAL IN
outside_diameter0.750 INCHES NOMINAL IN
style_designatorCROWN
attachment_methodSCREW ON
overall_thickness0.650 INCHES NOMINAL IN
nominal_thread_size0.138 INCHES RECEPTACLE IN
thread_quantity_per_inch32 RECEPTACLE
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) RECEPTACLE
shaft_accommodation_styleROUND
NSN5355-01-048-9911
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available BACK20B1 TITLE COMPONENT PN BACK20B1 MFR BACK20B1
KEY FEATURES
•
SHANK DIAMETER: 0.310 INCHES NOMINAL IN
•
SHAFT ACCOMMODATION STYLE: ROUND
•
OVERALL THICKNESS: 0.650 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CROWN
•
OUTSIDE DIAMETER: 0.750 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.138 INCHES RECEPTACLE IN
•
INSIDE DIAMETER: 0.138 INCHES NOMINAL IN
•
SHANK STYLE: CONCAVE
TECHNICAL CHARACTERISTICS
SHANK DIAMETER0.310 INCHES NOMINAL IN
SHAFT ACCOMMODATION STYLEROUND
OVERALL THICKNESS0.650 INCHES NOMINAL IN
STYLE DESIGNATORCROWN
OUTSIDE DIAMETER0.750 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.138 INCHES RECEPTACLE IN
INSIDE DIAMETER0.138 INCHES NOMINAL IN
SHANK STYLECONCAVE
GRIPPING SURFACE CONDITIONSMOOTH
COLORBLACK
OTHER ITEMS IN FSC 5355 — Knobs and Pointers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5355-00-000-5777 5355-00-001-2029 5355-00-001-2403 5355-00-001-4109 5355-00-001-4677 5355-00-001-4724 5355-00-001-4730 5355-00-001-4734
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BACK20B1?
BACK20B1 is a BACK20B1.
What is the NSN for BACK20B1?
BACK20B1 is cataloged in the U.S. Government catalog under NSN 5355-01-048-9911. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.