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MS51873-33B — Technical Data Sheet

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— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The NIPPLE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, connection_type: THREADED EXTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, special_features: SCHEDULE 80, style_designator: LONG, surface_treatment: OXIDE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4730-01-093-8605, 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
MS51873-33B
NSN: 4730-01-093-8605
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
connection_typeTHREADED EXTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
special_featuresSCHEDULE 80
style_designatorLONG
surface_treatmentOXIDE OVERALL
nominal_thread_size0.250 INCHES ALL ENDS IN
nominal_overall_length2.500 INCHES IN
media_for_which_designedAIR SECOND RESPONSE
thread_series_designatorNPT ALL ENDS
nondefinitive_spec/std_data3 TYPE AND EXTRA-STRONG WEIGHT
specification/standard_data96906-MS51873 GOVERNMENT STANDARD AND 81348-WW-N-351 GOVERNMENT SPECIFICATION
NSN4730-01-093-8605
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51873-33B · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NONDEFINITIVE SPEC/STD DATA: 3 TYPE AND EXTRA-STRONG WEIGHT
•
NOMINAL THREAD SIZE: 0.250 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
•
SPECIFICATION/STANDARD DATA: 96906-MS51873 GOVERNMENT STANDARD AND 81348-WW-N-351 GOVERNMENT SPECIFICATION
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A120 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL OVERALL LENGTH: 2.500 INCHES IN
•
MEDIA FOR WHICH DESIGNED: FLUID FIRST RESPONSE
•
CONNECTION TYPE: THREADED EXTERNAL PIPE ALL ENDS
TECHNICAL CHARACTERISTICS
NONDEFINITIVE SPEC/STD DATA3 TYPE AND EXTRA-STRONG WEIGHT
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORNPT ALL ENDS
SPECIFICATION/STANDARD DATA96906-MS51873 GOVERNMENT STANDARD AND 81348-WW-N-351 GOVERNMENT SPECIFICATION
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A120 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OVERALL LENGTH2.500 INCHES IN
MEDIA FOR WHICH DESIGNEDFLUID FIRST RESPONSE
CONNECTION TYPETHREADED EXTERNAL PIPE ALL ENDS
MATERIALSTEEL OVERALL
SPECIAL FEATURESSCHEDULE 80
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
WW-N-351 TY3WTEXTRA-STRONGInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A733S-199CFBInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
ASTM-A733InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
WWN351TYPE2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
WW-N-351InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS51873-108BInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51873-33B?
MS51873-33B is a NIPPLE,PIPE.
What parts can replace MS51873-33B?
There are 17 known substitutes for MS51873-33B: WW-N-351 TY3WTEXTRA-STRONG, A733S-199CFB, ASTM-A733 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51873-33B?
MS51873-33B is cataloged in the Federal Logistics Information System under NSN 4730-01-093-8605. 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: October 2026