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655641 — COUPLER,DIRECTIONAL

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

655641: COUPLER,DIRECTIONAL.

The COUPLER,DIRECTIONAL is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, shank_length: 0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN, overall_length: 1.000 INCHES NOMINAL IN, shank_diameter: 0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN, first_end_style: SQUARE, special_features: HAS 0.091 IN. MIN,0.101 IN.

MAX DIA THRU HOLE W/0.183 IN. MIN. 0.193 IN.

MAX COUNTERBORE FOR 0.750 IN. IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-488-4377, 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
655641
NSN: 5315-00-488-4377
NIINs: 004884377, 013023707
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
shank_length0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
overall_length1.000 INCHES NOMINAL IN
shank_diameter0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
first_end_styleSQUARE
special_featuresHAS 0.091 IN. MIN,0.101 IN. MAX DIA THRU HOLE W/0.183 IN. MIN. 0.193 IN. MAX COUNTERBORE FOR 0.750 IN. IN
style_designatorSHOULDER
shoulder_diameter0.330 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
first_end_locationSHORT SHANK END
second_shank_length0.625 INCHES NOMINAL IN
second_shank_diameter0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
end_item_identificationPACER SPECIAL
NSN5315-00-488-4377
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 655641 · 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
•
SHANK DIAMETER: 0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
•
SECOND SHANK DIAMETER: 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
•
FIRST END LOCATION: SHORT SHANK END
•
FIRST END STYLE: SQUARE
•
SHANK LENGTH: 0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5613 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SHANK DIAMETER0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
SECOND SHANK DIAMETER0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
FIRST END LOCATIONSHORT SHANK END
FIRST END STYLESQUARE
SHANK LENGTH0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
STYLE DESIGNATORSHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5613 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH1.000 INCHES NOMINAL IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
SHOULDER DIAMETER0.330 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 655641?
655641 is a COUPLER,DIRECTIONAL.
What is the NSN for 655641?
655641 is cataloged in the U.S. Government catalog under NSN 5315-00-488-4377. 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.