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Technical Data Sheet
MS21251-B6S ✓ 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: COPPER ALLOY 482 OVERALL, body_style: ROUND BODY W/LOCKING DEVICE, body_length: 2.219 INCHES MINIMUM AND 2.281 INCHES MAXIMUM IN, thread_class: 3B BODY, nominal_thread_size: 0.312 INCHES BODY IN, thread_series_designator: UNF BODY. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-067-9882, 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-B6S
NSN: 5340-00-067-9882
FSC: 5340
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY 482 OVERALL
body_styleROUND BODY W/LOCKING DEVICE
body_length2.219 INCHES MINIMUM AND 2.281 INCHES MAXIMUM IN
thread_class3B BODY
nominal_thread_size0.312 INCHES BODY IN
thread_series_designatorUNF BODY
material_document_and_classificationQQ-B-637,COMP 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5340-00-067-9882
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS21251-B6S 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 LENGTH: 2.219 INCHES MINIMUM AND 2.281 INCHES MAXIMUM IN
BODY STYLE: ROUND BODY W/LOCKING DEVICE
MATERIAL: COPPER ALLOY 482 OVERALL
THREAD SERIES DESIGNATOR: UNF BODY
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-637,COMP 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS: 3B BODY
NOMINAL THREAD SIZE: 0.312 INCHES BODY IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY LENGTH2.219 INCHES MINIMUM AND 2.281 INCHES MAXIMUM IN
BODY STYLEROUND BODY W/LOCKING DEVICE
MATERIALCOPPER ALLOY 482 OVERALL
THREAD SERIES DESIGNATORUNF BODY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-637,COMP 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS3B BODY
NOMINAL THREAD SIZE0.312 INCHES BODY IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
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
AN155-46SInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21251-B6S?
MS21251-B6S is a TURNBUCKLE BODY.
What parts can replace MS21251-B6S?
There are 7 known substitutes for MS21251-B6S: MS21251B3S, 2810689, AN165-16RS and 4 more. Substitute compatibility should be verified for your specific system.
Is MS21251-B6S still available?
MS21251-B6S is currently cancelled.
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