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2999T56 — TURNBUCKLE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

2999T56: TURNBUCKLE.

The TURNBUCKLE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, end_style: CLOSED EYE AND CLOSED EYE, eye_width: 1.000 INCHES MINIMUM IN, body_style: ROUND OPEN BODY, take-up_distance: 12.000 INCHES NOMINAL IN, surface_treatment: ZINC OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-121-1961, 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
2999T56
NSN: 5340-01-121-1961
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
end_styleCLOSED EYE AND CLOSED EYE
eye_width1.000 INCHES MINIMUM IN
body_styleROUND OPEN BODY
take-up_distance12.000 INCHES NOMINAL IN
surface_treatmentZINC OVERALL
surface_treatment_document_and_classificationASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5340-01-121-1961
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2999T56 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
TAKE-UP DISTANCE: 12.000 INCHES NOMINAL IN
•
EYE WIDTH: 1.000 INCHES MINIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
BODY STYLE: ROUND OPEN BODY
•
END STYLE: CLOSED EYE AND CLOSED EYE
•
SURFACE TREATMENT: ZINC OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
TAKE-UP DISTANCE12.000 INCHES NOMINAL IN
EYE WIDTH1.000 INCHES MINIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
BODY STYLEROUND OPEN BODY
END STYLECLOSED EYE AND CLOSED EYE
SURFACE TREATMENTZINC OVERALL
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
FF-T-791Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2999T56?
2999T56 is a TURNBUCKLE.
What parts can replace 2999T56?
There is 1 known substitute for 2999T56: FF-T-791. Substitute compatibility should be verified for your specific system.
What is the NSN for 2999T56?
2999T56 is cataloged in the U.S. Government catalog under NSN 5340-01-121-1961. 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.