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81939 — STUD,PLAIN

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

81939: STUD,PLAIN.

The STUD,PLAIN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 440C OVERALL, thread_class: 2A STUD THREAD A, thread_length: 0.562 INCHES NOMINAL STUD THREAD IN, overall_length: 6.312 INCHES NOMINAL IN, thread_direction: RIGHT-HAND STUD THREAD, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-237-5660, 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
81939
NSN: 5330-00-237-5660
NIINs: 002375660, 002860358
FSC: 5330 — Packing and Gasket Materials
CAGE: 81982 — HYDRO-AIRE AEROSPACE CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 440C OVERALL
thread_class2A STUD THREAD A
thread_length0.562 INCHES NOMINAL STUD THREAD IN
overall_length6.312 INCHES NOMINAL IN
thread_directionRIGHT-HAND STUD THREAD
surface_treatmentPASSIVATE OVERALL
outer_groove_depth0.045 INCHES NOMINAL IN
outer_groove_width0.101 INCHES MINIMUM AND 0.107 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES STUD THREAD IN
peripheral_diameter0.970 INCHES NOMINAL IN
center_hole_diameter0.380 INCHES NOMINAL IN
cross-sectional_height0.300 INCHES NOMINAL IN
NSN5330-00-237-5660
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 81939 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
•
OUTER GROOVE DEPTH: 0.045 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CROSS-SECTIONAL HEIGHT: 0.300 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
PERIPHERAL DIAMETER: 0.970 INCHES NOMINAL IN
•
OUTER GROOVE WIDTH: 0.101 INCHES MINIMUM AND 0.107 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
CENTER HOLE DIAMETER: 0.380 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OUTER GROOVE DEPTH0.045 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
CROSS-SECTIONAL HEIGHT0.300 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
PERIPHERAL DIAMETER0.970 INCHES NOMINAL IN
OUTER GROOVE WIDTH0.101 INCHES MINIMUM AND 0.107 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
CENTER HOLE DIAMETER0.380 INCHES NOMINAL IN
MATERIALSTEEL COMP 440C OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 81939?
81939 is a STUD,PLAIN.
What is the NSN for 81939?
81939 is cataloged in the U.S. Government catalog under NSN 5330-00-237-5660. 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.