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Technical Data Sheet
PartsTable / COMPONENT / 51657
51657 ✓ Verified by PartsTable
Hama · 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 BOLT,TOGGLE is a Hama industrial component. Key specifications include length: 2.880 INCHES MINIMUM AND 3.120 INCHES MAXIMUM IN, material: STEEL OVERALL, thread_class: 2A A, style_designator: SPRING-WING, SHEET METAL, MACHINE SCREW, surface_treatment: ZINC OVERALL, wing_spread_width: 0.750 INCHES MINIMUM 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 5306-00-195-4730, 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
51657
NSN: 5306-00-195-4730
FSC: 5306
CAGE: 3ELJ0 — FASTENAL COMPANY (USA)
SPECIFICATIONS
length2.880 INCHES MINIMUM AND 3.120 INCHES MAXIMUM IN
materialSTEEL OVERALL
thread_class2A A
style_designatorSPRING-WING, SHEET METAL, MACHINE SCREW
surface_treatmentZINC OVERALL
wing_spread_width0.750 INCHES MINIMUM IN
nominal_thread_diameter0.138 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
surface_treatment_document_and_classificationASTM B633,FE/ZN 5,TY3 ASSN STD ALL TREATMENT RESPONSES OVERALL
NSN5306-00-195-4730
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 51657 · Hama ⚠ 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
•
THREAD QUANTITY PER INCH: 32
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
LENGTH: 2.880 INCHES MINIMUM AND 3.120 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633,FE/ZN 5,TY3 ASSN STD ALL TREATMENT RESPONSES OVERALL
•
STYLE DESIGNATOR: SPRING-WING, SHEET METAL, MACHINE SCREW
•
SURFACE TREATMENT: ZINC OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESSLOTTED, ROUND HEAD MACHINE SCREW TOGGLE BOLTS ARE SELF-CONTAINED ANCHORING DEVICES W/TWO-PIECE, SPRING, SHEET METAL WINGS WHICH AUTOMATICALLY OPEN OR SWING INTO PLACE AFTER BEING PUSHED THROUGH AN OPEN HOLE ACCESSIBLE FROM ONE SIDE ONLY; TRUNNION NUT MATERIAL DIE CAST ZINC; WINGS ARE PIVOTED EITHER ON TRUNNION NUTS OR PINS AND HELD NORMALLY IN OPEN POSITION BY A SPRING PLACED INSIDE THE U OR CHANNEL SHAPE WING GROOVE; PROOF LOAD 175 LBS. MINIMUM LBS
THREAD QUANTITY PER INCH32
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
LENGTH2.880 INCHES MINIMUM AND 3.120 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.138 INCHES IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633,FE/ZN 5,TY3 ASSN STD ALL TREATMENT RESPONSES OVERALL
STYLE DESIGNATORSPRING-WING, SHEET METAL, MACHINE SCREW
SURFACE TREATMENTZINC OVERALL
MATERIALSTEEL OVERALL
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
FFB588Upgraded Successor
successor cross-reference
successor
FF-S-92Upgraded Successor
successor cross-reference
successor
FF-B-588 TY1CLAST1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51657?
51657 is a BOLT,TOGGLE manufactured by Hama.
What parts can replace 51657?
There are 3 known substitutes for 51657: FFB588, FF-S-92, FF-B-588 TY1CLAST1. Substitute compatibility should be verified for your specific system.
What is the NSN for 51657?
51657 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-195-4730. 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