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A1161A — A1161A

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

A1161A: A1161A.

The A1161A is a the manufacturer industrial component. Key specifications include material: STEEL NUT, nut_style: ROUND, nut_diameter: 2.750 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 0.688 INCHES NOMINAL IN, thread_series: UN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-050-8292, 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
MRO→ MRO_GENERAL→ A1161A
NSN: 5310-00-050-8292
NIINs: 000508292, 007902785
FSC: 5310 — Nuts and Washers
CAGE: 82328 — DRESSER RAND CO TERRY CORP STEAM TURBINE MOTOR AND GENERATOR CO A JOINT VENTURE (USA)
SPECIFICATIONS
materialSTEEL NUT
nut_styleROUND
nut_diameter2.750 INCHES NOMINAL IN
thread_class2B
nut_thickness0.688 INCHES NOMINAL IN
thread_seriesUN
thread_directionRIGHT-HAND
drive_point_depth0.063 INCHES NOMINAL IN
drive_point_width0.250 INCHES NOMINAL IN
nominal_thread_size1.625 INCHES IN
counterbore_diameter2.500 INCHES NOMINAL NUT IN
drive_point_quantity4
NSN5310-00-050-8292
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A1161A · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD SERIES: UN
•
HOLE CONFIGURATION STYLE: CONFIGURATION F
•
NUT COUNTERBORE DEPTH: 0.125 INCHES NOMINAL NUT IN
•
DRIVE POINT WIDTH: 0.250 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.625 INCHES IN
•
NUT DIAMETER: 2.750 INCHES NOMINAL IN
•
COUNTERBORE DIAMETER: 2.500 INCHES NOMINAL NUT IN
TECHNICAL CHARACTERISTICS
THREAD SERIESUN
HOLE CONFIGURATION STYLECONFIGURATION F
NUT COUNTERBORE DEPTH0.125 INCHES NOMINAL NUT IN
DRIVE POINT WIDTH0.250 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.625 INCHES IN
NUT DIAMETER2.750 INCHES NOMINAL IN
COUNTERBORE DIAMETER2.500 INCHES NOMINAL NUT IN
DRIVE POINT DEPTH0.063 INCHES NOMINAL IN
NUT THICKNESS0.688 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 4
N566A1161Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
A1161PCN566Reference document
Same NSN cross-reference
Reference document — Secondary reference
NH7472PC566Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
504201Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A1161A?
A1161A is a A1161A. It is classified as a MRO (MRO_GENERAL).
What parts can replace A1161A?
There are 4 known substitutes for A1161A: N566A1161, A1161PCN566, NH7472PC566 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A1161A?
A1161A is cataloged in the U.S. Government catalog under NSN 5310-00-050-8292. 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.