PartsTable
Technical Data Sheet
77857 ✓ Verified by PartsTable
Legrand · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The PIN,PISTON is a Legrand industrial component. Key specifications include nut_style: HEXAGON, nut_height: 0.224 INCHES MINIMUM AND 0.254 INCHES MAXIMUM IN, thread_class: 2A A, thread_series: UNIFIED NATIONAL COARSE (UNC), locking_feature: PREVAILING TORQUE WITH METALLIC INSERT, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-012-2159, 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
77857
NSN: 5305-00-012-2159
FSC: 5305
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
nut_styleHEXAGON
nut_height0.224 INCHES MINIMUM AND 0.254 INCHES MAXIMUM IN
thread_class2A A
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE WITH METALLIC INSERT
thread_directionRIGHT-HAND
width_across_flats0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
nominal_thread_size0.190 INCHES IN
bearing_surface_typeCHAMFERED
end_item_identificationOMEGA SEAL CUTTING MACHINE SPARES
thread_quantity_per_inch24
criticality_code_justificationAGAV
NSN5305-00-012-2159
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 77857 · Legrand ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
INTERNAL DRIVE STYLE: SLOT
NONDEFINITIVE SPEC/STD DATA: 1S STYLE AND I TYPE
HEAD STYLE: ROUND
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 FED SPEC ALL MATERIAL RESPONSES
THREAD DIRECTION: RIGHT-HAND
SCREW SURFACE TREATMENT: CADMIUM OR ZINC
THREAD QUANTITY PER INCH: 32
HEAD DIAMETER: 0.287 INCHES MINIMUM AND 0.309 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL DRIVE STYLESLOT
NONDEFINITIVE SPEC/STD DATA1S STYLE AND I TYPE
HEAD STYLEROUND
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 FED SPEC ALL MATERIAL RESPONSES
THREAD DIRECTIONRIGHT-HAND
SCREW SURFACE TREATMENTCADMIUM OR ZINC
THREAD QUANTITY PER INCH32
HEAD DIAMETER0.287 INCHES MINIMUM AND 0.309 INCHES MAXIMUM IN
THREAD CLASS2A A
NOMINAL THREAD DIAMETER0.164 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
90066Interchangeable
interchangeable cross-reference
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50001987-16Interchangeable
interchangeable cross-reference
interchangeable
90066-7Interchangeable
interchangeable cross-reference
interchangeable
703795-1Interchangeable
interchangeable cross-reference
interchangeable
S77857Interchangeable
interchangeable cross-reference
interchangeable
77857Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 77857?
77857 is a PIN,PISTON manufactured by Legrand.
What parts can replace 77857?
There are 21 known substitutes for 77857: 90066, 50001987-16, 90066-7 and 18 more. Substitute compatibility should be verified for your specific system.
Is 77857 still available?
77857 is currently cancelled.
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