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Technical Data Sheet
PartsTable / MRO / 61891
61891 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

CYLINDER ASSEMBLY,HYDRAULIC BRAK. Key specifications include material: IRON BODY, port_style: INVERTED FLARE ALL PORTS, hole_diameter: 0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 4.250 INCHES NOMINAL IN, overall_height: 5.000 INCHES NOMINAL IN, reservoir_type: INTEGRAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-251-4721, 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
MRO→ MRO_GENERAL→ 61891
NSN: 5330-00-251-4721
FSC: 5330
CAGE: 22593 — FITZGERALD GASKET A CO OF TANNETICS INC (USA)
SPECIFICATIONS
materialIRON BODY
port_styleINVERTED FLARE ALL PORTS
hole_diameter0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width4.250 INCHES NOMINAL IN
overall_height5.000 INCHES NOMINAL IN
reservoir_typeINTEGRAL
actuation_methodDIRECT
aperture_diameter1.062 INCHES NOMINAL IN
port_thread_class2B ALL PORTS
seat_angle_in_deg42.0 SINGLE PORT
mounting_provisionUNTHREADED MOUNTING HOLES
bolt_circle_diameter2.250 INCHES NOMINAL IN
NSN5330-00-251-4721
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 61891 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
•
HOLE DIAMETER: 0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
SIDE RADIUS FROM GASKET CENTER: 0.875 INCHES NOMINAL IN
•
APERTURE DIAMETER: 1.062 INCHES NOMINAL IN
•
BOLT CIRCLE DIAMETER: 2.250 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: HH-P-96 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
MATERIAL: PAPER AND GLUE AND GLYCERIN OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.031 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
SIDE RADIUS FROM GASKET CENTER0.875 INCHES NOMINAL IN
APERTURE DIAMETER1.062 INCHES NOMINAL IN
BOLT CIRCLE DIAMETER2.250 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONHH-P-96 FED SPEC ALL MATERIAL RESPONSES OVERALL
MATERIALPAPER AND GLUE AND GLYCERIN OVERALL
CROSS-SECTIONAL THICKNESS0.031 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
61891Interchangeable
interchangeable cross-reference
interchangeable
170234R1Interchangeable
interchangeable cross-reference
interchangeable
HM-804810Interchangeable
interchangeable cross-reference
interchangeable
1228T644Interchangeable
interchangeable cross-reference
interchangeable
22-666Interchangeable
interchangeable cross-reference
interchangeable
G60104Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 61891?
61891 is a CYLINDER ASSEMBLY,HYDRAULIC BRAK. It is classified as a MRO (MRO_GENERAL).
What parts can replace 61891?
There are 21 known substitutes for 61891: 61891, 170234R1, HM-804810 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 61891?
61891 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-251-4721. 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