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Technical Data Sheet
PartsTable / COMPONENT / 521571
521571 ✓ 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 GROMMET,NONMETALLIC is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC OVERALL, groove_width: 0.063 INCHES NOMINAL IN, grommet_style: ROUND, hole_diameter: 0.250 INCHES NOMINAL IN, overall_height: 0.250 INCHES NOMINAL IN, flange_thickness: 0.094 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-286-2580, 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
521571
NSN: 5325-00-286-2580
FSC: 5325
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
groove_width0.063 INCHES NOMINAL IN
grommet_styleROUND
hole_diameter0.250 INCHES NOMINAL IN
overall_height0.250 INCHES NOMINAL IN
flange_thickness0.094 INCHES NOMINAL IN
features_providedCOOLANT RESISTANT AND OIL RESISTANT
groove_outside_diameter0.375 INCHES NOMINAL IN
grommet_construction_typeSOLID
large_flange_outside_diameter0.563 INCHES NOMINAL IN
NSN5325-00-286-2580
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 521571 · 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
•
MATERIAL: RUBBER SYNTHETIC OVERALL
•
TEST DATA DOCUMENT: 81348-MIL-G-3036 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
•
GROMMET STYLE: ROUND
•
GROMMET CONSTRUCTION TYPE: SOLID
•
HOLE DIAMETER: 0.250 INCHES NOMINAL IN
•
GROOVE WIDTH: 0.063 INCHES NOMINAL IN
•
GROOVE OUTSIDE DIAMETER: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER SYNTHETIC OVERALL
TEST DATA DOCUMENT81348-MIL-G-3036 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
GROMMET STYLEROUND
OVERALL HEIGHT0.250 INCHES NOMINAL IN
GROMMET CONSTRUCTION TYPESOLID
HOLE DIAMETER0.250 INCHES NOMINAL IN
GROOVE WIDTH0.063 INCHES NOMINAL IN
GROOVE OUTSIDE DIAMETER0.375 INCHES NOMINAL IN
FEATURES PROVIDEDCOOLANT RESISTANT AND OIL RESISTANT
LARGE FLANGE OUTSIDE DIAMETER0.563 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
4044210Interchangeable
interchangeable cross-reference
interchangeable
BB607Interchangeable
interchangeable cross-reference
interchangeable
74044210Interchangeable
interchangeable cross-reference
interchangeable
3040PL1205782Interchangeable
interchangeable cross-reference
interchangeable
9604Interchangeable
interchangeable cross-reference
interchangeable
1220074-17Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 521571?
521571 is a GROMMET,NONMETALLIC.
What parts can replace 521571?
There are 26 known substitutes for 521571: 4044210, BB607, 74044210 and 23 more. Substitute compatibility should be verified for your specific system.
Is 521571 still available?
521571 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026