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Technical Data Sheet
MS21251-B5L ✓ 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: 3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN, thread_class: 3B BODY, thread_length: 2.250 INCHES NOMINAL OVERALL IN, special_features: BODY DOES NOT COME WITH CLIP, USE MS21256-2 NSN 5340-00-010-3090. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-067-9880, 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-B5L
NSN: 5340-00-067-9880
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_length3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN
thread_class3B BODY
thread_length2.250 INCHES NOMINAL OVERALL IN
special_featuresBODY DOES NOT COME WITH CLIP, USE MS21256-2 NSN 5340-00-010-3090
thread_directionRIGHT-HAND OVERALL
nominal_thread_size0.250 INCHES BODY IN
thread_series_designatorUNF BODY
material_document_and_classificationQQ-B-637,COMP 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5340-00-067-9880
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS21251-B5L 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: 3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN
NOMINAL THREAD SIZE: 0.250 INCHES BODY IN
THREAD CLASS: 3B BODY
THREAD SERIES DESIGNATOR: UNF BODY
THREAD LENGTH: 2.250 INCHES NOMINAL OVERALL IN
BODY STYLE: ROUND BODY W/LOCKING DEVICE
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-637,COMP 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
BODY LENGTH3.969 INCHES MINIMUM AND 4.031 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.250 INCHES BODY IN
SPECIAL FEATURESBODY DOES NOT COME WITH CLIP, USE MS21256-2 NSN 5340-00-010-3090
THREAD CLASS3B BODY
THREAD SERIES DESIGNATORUNF BODY
THREAD LENGTH2.250 INCHES NOMINAL OVERALL IN
BODY STYLEROUND BODY W/LOCKING DEVICE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-637,COMP 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND OVERALL
MATERIALCOPPER ALLOY 482 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
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
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21251-B5L?
MS21251-B5L is a TURNBUCKLE BODY.
What parts can replace MS21251-B5L?
There are 5 known substitutes for MS21251-B5L: MS21251B3S, 2810689, AN165-16RS and 2 more. Substitute compatibility should be verified for your specific system.
Is MS21251-B5L still available?
MS21251-B5L is currently cancelled.
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