PartsTable
Technical Data Sheet
MS21251-5L ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The TURNBUCKLE BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8630 OR STEEL COMP 4130 OVERALL, body_style: ROUND BODY W/LOCKING DEVICE, body_length: 3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN, thread_class: 3B BODY, thread_length: 4.000 INCHES NOMINAL OVERALL IN, thread_direction: RIGHT-HAND OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-067-9879, 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
MS21251-5L
NSN: 5340-00-067-9879
FSC: 5340
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 8630 OR STEEL COMP 4130 OVERALL
body_styleROUND BODY W/LOCKING DEVICE
body_length3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN
thread_class3B BODY
thread_length4.000 INCHES NOMINAL OVERALL IN
thread_directionRIGHT-HAND OVERALL
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.250 INCHES BODY IN
thread_series_designatorUNF BODY
material_document_and_classificationMIL-S-6050 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5340-00-067-9879
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS21251-5L 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
BODY STYLE: ROUND BODY W/LOCKING DEVICE
SURFACE TREATMENT: CADMIUM OVERALL
THREAD SERIES DESIGNATOR: UNF BODY
NOMINAL THREAD SIZE: 0.250 INCHES BODY IN
BODY LENGTH: 3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN
THREAD CLASS: 3B BODY
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH: 4.000 INCHES NOMINAL OVERALL IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY STYLEROUND BODY W/LOCKING DEVICE
SURFACE TREATMENTCADMIUM OVERALL
THREAD SERIES DESIGNATORUNF BODY
NOMINAL THREAD SIZE0.250 INCHES BODY IN
BODY LENGTH3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN
THREAD CLASS3B BODY
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH4.000 INCHES NOMINAL OVERALL IN
THREAD DIRECTIONRIGHT-HAND OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6050 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
MS21251B3SUpgraded Successor
successor cross-reference
successor
2810689Upgraded Successor
successor cross-reference
successor
AN165-16RSUpgraded Successor
successor cross-reference
successor
MIL-DTL-8878Upgraded Successor
successor cross-reference
successor
MS21254-3RSUpgraded Successor
successor cross-reference
successor
941.93.41.616Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21251-5L?
MS21251-5L is a TURNBUCKLE BODY.
What parts can replace MS21251-5L?
There are 6 known substitutes for MS21251-5L: MS21251B3S, 2810689, AN165-16RS and 3 more. Substitute compatibility should be verified for your specific system.
Is MS21251-5L still available?
MS21251-5L is currently cancelled.
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