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8991-3 — NUT,PLAIN,KNURLED

✓ Government record, cited
InLine · NUT WASHER
PRODUCT OVERVIEW

8991-3: NUT,PLAIN,KNURLED.

Connects various devices such as notebooks, amplifiers, Sat receiver, DVD player etc. via optical audio connector. - 3.5mm plug to Toslink plug; - Cable black.

Key specifications include material: COPPER ALLOY OVERALL, nut_style: KNURLED, construction: SLOT WOUND, nut_diameter: 0.600 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 0.062 INCHES NOMINAL IN. This part is cataloged in the U.S. Government catalog under NSN 5310-00-275-9201, 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
8991-3
NSN: 5310-00-275-9201
NIINs: 002759201, 002950194
FSC: 5310 — Nuts and Washers
CAGE: 04009 — COOPER INDUSTRIES INC COOPER DISTRIBUTION EQUIPMENT DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleKNURLED
constructionSLOT WOUND
nut_diameter0.600 INCHES NOMINAL IN
thread_class2B
nut_thickness0.062 INCHES NOMINAL IN
thread_seriesUNS
overall_length4.0781 INCHES NOMINAL IN
overall_diameter1.4687 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedSHAFT
surface_treatmentNICKEL OVERALL
NSN5310-00-275-9201
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 8991-3 · InLine ⚠ 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: UNS
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.469 INCHES IN
•
NUT DIAMETER: 0.600 INCHES NOMINAL IN
•
NUT THICKNESS: 0.062 INCHES NOMINAL IN
•
SURFACE TREATMENT: NICKEL OVERALL
•
NUT STYLE: KNURLED
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS
THREAD SERIESUNS
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.469 INCHES IN
NUT DIAMETER0.600 INCHES NOMINAL IN
NUT THICKNESS0.062 INCHES NOMINAL IN
SURFACE TREATMENTNICKEL OVERALL
NUT STYLEKNURLED
THREAD CLASS2B
THREAD QUANTITY PER INCH32
MATERIALCOPPER ALLOY OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
899U3Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 8991-3?
8991-3 is a NUT,PLAIN,KNURLED manufactured by InLine.
What parts can replace 8991-3?
There is 1 known substitute for 8991-3: 899U3. Substitute compatibility should be verified for your specific system.
What is the NSN for 8991-3?
8991-3 is cataloged in the U.S. Government catalog under NSN 5310-00-275-9201. 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.