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PartsTable / COMPONENT / 28-377-A
28-377-A ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The PIN,STRAIGHT,HEADED is a the manufacturer industrial component. Key specifications include diameter: 0.312 INCHES NOMINAL IN, head_style: BUTTON (RATIO OF HGTH/CRRG OVER 0.190 TO 0.300 INCLUSIVE), special_features: LOCK PIN IS 0.25 IN. DIA.

0.750 IN. LENGTH FOR ASSEMBLY IN, style_designator: STRAIGHT, features_provided: LOCK PIN, under_head_length: 1.250 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-182-5381, 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
28-377-A
NSN: 5315-01-182-5381
FSC: 5315
CAGE: 01420 — HOYT CORPORATION (USA)
SPECIFICATIONS
diameter0.312 INCHES NOMINAL IN
head_styleBUTTON (RATIO OF HGTH/CRRG OVER 0.190 TO 0.300 INCLUSIVE)
special_featuresLOCK PIN IS 0.25 IN. DIA. 0.750 IN. LENGTH FOR ASSEMBLY IN
style_designatorSTRAIGHT
features_providedLOCK PIN
under_head_length1.250 INCHES NOMINAL IN
NSN5315-01-182-5381
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 28-377-A · 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
•
STYLE DESIGNATOR: STRAIGHT
•
DIAMETER: 0.312 INCHES NOMINAL IN
•
HEAD STYLE: BUTTON (RATIO OF HGTH/CRRG OVER 0.190 TO 0.300 INCLUSIVE)
•
FEATURES PROVIDED: LOCK PIN
•
UNDER HEAD LENGTH: 1.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORSTRAIGHT
DIAMETER0.312 INCHES NOMINAL IN
HEAD STYLEBUTTON (RATIO OF HGTH/CRRG OVER 0.190 TO 0.300 INCLUSIVE)
FEATURES PROVIDEDLOCK PIN
UNDER HEAD LENGTH1.250 INCHES NOMINAL IN
SPECIAL FEATURESLOCK PIN IS 0.25 IN. DIA. 0.750 IN. LENGTH FOR ASSEMBLY IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
28377Interchangeable
interchangeable cross-reference
interchangeable
561692-19Interchangeable
interchangeable cross-reference
interchangeable
866963Interchangeable
interchangeable cross-reference
interchangeable
AB0070866963Interchangeable
interchangeable cross-reference
interchangeable
330C889A4028D16Interchangeable
interchangeable cross-reference
interchangeable
5305PL0714166Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 28-377-A?
28-377-A is a PIN,STRAIGHT,HEADED.
What parts can replace 28-377-A?
There are 7 known substitutes for 28-377-A: 28377, 561692-19, 866963 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 28-377-A?
28-377-A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-182-5381. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026