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127689 — RELAY ASSEMBLY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

127689: RELAY ASSEMBLY.

The RELAY ASSEMBLY is a the manufacturer industrial component. Key specifications include length: 0.913 INCHES MINIMUM AND 0.917 INCHES MAXIMUM IN, diameter: 0.250 INCHES NOMINAL IN, hole_diameter: 1.792 INCHES MINIMUM AND 1.817 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 2.281 INCHES MINIMUM AND 2.311 INCHES MAXIMUM IN, style_designator: PROJECTION BOTH ENDS LEFT AND RIGHT INTERNAL THREADS. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-186-0968, 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
127689
NSN: 5310-00-186-0968
NIINs: 001860968, 010999279, 012795274
FSC: 5310 — Nuts and Washers
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
length0.913 INCHES MINIMUM AND 0.917 INCHES MAXIMUM IN
diameter0.250 INCHES NOMINAL IN
hole_diameter1.792 INCHES MINIMUM AND 1.817 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter2.281 INCHES MINIMUM AND 2.311 INCHES MAXIMUM IN
style_designatorPROJECTION BOTH ENDS LEFT AND RIGHT INTERNAL THREADS
material_thickness0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
cross-sectional_shapeROUND
external_key_quantity17
functional_descriptionUSED FOR INTERLOCKING PURPOSES ON DOORS
end_item_identificationCSOCSECURITYS
individual_relay_quantity1
NSN5310-00-186-0968
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 127689 · 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
•
INTERNAL PREBENT KEY WIDTH: 0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 2.734 INCHES MAXIMUM IN
•
HARDNESS RATING: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
OUTSIDE DIAMETER: 2.281 INCHES MINIMUM AND 2.311 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 17
TECHNICAL CHARACTERISTICS
INTERNAL PREBENT KEY WIDTH0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS2.734 INCHES MAXIMUM IN
HARDNESS RATING50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66 FED STD ALL MATERIAL RESPONSES OVERALL
OUTSIDE DIAMETER2.281 INCHES MINIMUM AND 2.311 INCHES MAXIMUM IN
MATERIAL THICKNESS0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY17
INTERNAL PREBENT KEY LENGTH0.125 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.200 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 10
W09Reference document
Same NSN cross-reference
Reference document — Secondary reference
E2645PC30Reference document
Same NSN cross-reference
Reference document — Secondary reference
35515PC14Reference document
Same NSN cross-reference
Reference document — Secondary reference
20555PCM735Reference document
Same NSN cross-reference
Reference document — Secondary reference
G10090PC21Reference document
Same NSN cross-reference
Reference document — Secondary reference
3090-9PC27Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 127689?
127689 is a RELAY ASSEMBLY.
What parts can replace 127689?
There are 10 known substitutes for 127689: W09, E2645PC30, 35515PC14 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 127689?
127689 is cataloged in the U.S. Government catalog under NSN 5310-00-186-0968. 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.