PartsTable
Technical Data Sheet
B21491 ✓ 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 HINGE,BUTT is a the manufacturer industrial component. Key specifications include material: UNABLE TO DECODE, knuckle_type: FRICTION, pin_diameter: 0.093 INCHES NOMINAL IN, overall_length: 72.000 INCHES NOMINAL IN, knuckle_quantity: 144, performance_type: REGULAR DUTY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-229-4372, 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
B21491
NSN: 5340-00-229-4372
FSC: 5340
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
materialUNABLE TO DECODE
knuckle_typeFRICTION
pin_diameter0.093 INCHES NOMINAL IN
overall_length72.000 INCHES NOMINAL IN
knuckle_quantity144
performance_typeREGULAR DUTY
pin_removabilityNONREMOVABLE
style_designatorBUTT
surface_treatmentUNABLE TO DECODE
material_thickness0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
reversible_featureNOT INCLUDED
hinge_mounting_typeFULL SURFACE
NSN5340-00-229-4372
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B21491 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
MOUNTING HOLE QUANTITY: 68
PERFORMANCE TYPE: REGULAR DUTY
KNUCKLE QUANTITY: 144
MATERIAL THICKNESS: 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
PIN DIAMETER: 0.093 INCHES NOMINAL IN
PIN CENTER TO BODY EDGE DISTANCE: 0.750 INCHES NOMINAL IN
REVERSIBLE FEATURE: NOT INCLUDED
MOUNTING HOLE DIAMETER: 0.116 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING HOLE QUANTITY68
PERFORMANCE TYPEREGULAR DUTY
KNUCKLE QUANTITY144
MATERIAL THICKNESS0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
PIN DIAMETER0.093 INCHES NOMINAL IN
PIN CENTER TO BODY EDGE DISTANCE0.750 INCHES NOMINAL IN
REVERSIBLE FEATURENOT INCLUDED
MOUNTING HOLE DIAMETER0.116 INCHES NOMINAL IN
HINGE MOUNTING TYPEFULL SURFACE
STYLE DESIGNATORBUTT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
BHMA-A156.20Upgraded Successor
successor cross-reference
successor
MS27970-26Upgraded Successor
successor cross-reference
successor
FFH116Upgraded Successor
successor cross-reference
successor
BHMA-A156.1 A8133 3-1/2INUpgraded Successor
successor cross-reference
successor
A8133Upgraded Successor
successor cross-reference
successor
ANSI A156.1 A8133Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy B21491?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is B21491?
B21491 is a HINGE,BUTT.
What parts can replace B21491?
There are 21 known substitutes for B21491: BHMA-A156.20, MS27970-26, FFH116 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B21491?
B21491 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-229-4372. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — B21491