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Technical Data Sheet
PartsTable / COMPONENT / AN81-6
AN81-6 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The ADAPTER,STRAIGHT,PIPE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 347 OVERALL, seat_angle: 37.00 DEGREES FIRST END, thread_class: 3A SECOND END A, connection_type: THREADED EXTERNAL PIPE SECOND END, connection_style: FLARED (TUBE) FIRST END, special_features: CENTER WRENCHING; WEAPONS SYSTEM ESSENTIAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-150-9996, 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
AN81-6
NSN: 5306-00-150-9996
FSC: 5306
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 347 OVERALL
seat_angle37.00 DEGREES FIRST END
thread_class3A SECOND END A
connection_typeTHREADED EXTERNAL PIPE SECOND END
connection_styleFLARED (TUBE) FIRST END
special_featuresCENTER WRENCHING; WEAPONS SYSTEM ESSENTIAL
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.375 INCHES SECOND END IN
nominal_overall_length1.406 INCHES IN
end_item_identificationAIRCRAFT, B-52, C-5, F-15, OV-10, T-37, T-38, LGM-30, LARC XV
thread_series_designatorANPT SECOND END
specification/standard_data88044-AN816 GOVERNMENT STANDARD AND 81343-AS4842/1 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN5306-00-150-9996
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN81-6 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD CLASS: 3A A
•
WIDTH BETWEEN FLATS: 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR AMS 6300 ASSN STD 6TH MATERIAL RESPONSE OVERALL
•
THREAD LENGTH: 0.750 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD HEIGHT: 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3A A
WIDTH BETWEEN FLATS0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR AMS 6300 ASSN STD 6TH MATERIAL RESPONSE OVERALL
THREAD LENGTH0.750 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
HEAD HEIGHT0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHANK UNTHREADED HOLE DIAMETER0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN
THREAD SERIES DESIGNATORUNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
AN816-32DInterchangeable
interchangeable cross-reference
interchangeable
AS5194D3232Interchangeable
interchangeable cross-reference
interchangeable
AS4842/1Interchangeable
interchangeable cross-reference
interchangeable
15145-1Interchangeable
interchangeable cross-reference
interchangeable
AN816-6-6Interchangeable
interchangeable cross-reference
interchangeable
AN816-12-16Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN81-6?
AN81-6 is a ADAPTER,STRAIGHT,PIPE TO BOSS.
What parts can replace AN81-6?
There are 7 known substitutes for AN81-6: AN816-32D, AS5194D3232, AS4842/1 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN81-6?
AN81-6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-150-9996. 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: July 2026