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Technical Data Sheet
PartsTable / COMPONENT / 21526D
21526D ✓ 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 BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.312 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 1.500 INCHES MINIMUM IN, fastener_length: 1.500 INCHES MINIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-206-5586, 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
21526D
NSN: 5306-00-206-5586
FSC: 5306
CAGE: 31007 — NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.312 INCHES NOMINAL IN
thread_class3A A
thread_length1.500 INCHES MINIMUM IN
fastener_length1.500 INCHES MINIMUM IN
thread_directionRIGHT-HAND
features_providedUNFINISHED HEAD
width_between_flats0.562 INCHES NOMINAL IN
nominal_thread_diameter0.375 INCHES IN
thread_quantity_per_inch16
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5306-00-206-5586
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21526D · 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 LENGTH: 1.500 INCHES MINIMUM IN
•
WIDTH BETWEEN FLATS: 0.562 INCHES NOMINAL IN
•
FEATURES PROVIDED: UNFINISHED HEAD
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 10PSSJGR5 STYLE
•
HEAD STYLE: HEXAGON
•
FASTENER LENGTH: 1.500 INCHES MINIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH1.500 INCHES MINIMUM IN
WIDTH BETWEEN FLATS0.562 INCHES NOMINAL IN
FEATURES PROVIDEDUNFINISHED HEAD
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD DIAMETER0.375 INCHES IN
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10PSSJGR5 STYLE
HEAD STYLEHEXAGON
FASTENER LENGTH1.500 INCHES MINIMUM IN
HEAD HEIGHT0.312 INCHES NOMINAL IN
THREAD QUANTITY PER INCH16
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
AN10H20AUpgraded Successor
successor cross-reference
successor
MIL-DTL-1222JUpgraded Successor
successor cross-reference
successor
T857Upgraded Successor
successor cross-reference
successor
MILS1222Upgraded Successor
successor cross-reference
successor
2A-4639Upgraded Successor
successor cross-reference
successor
MILB857Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21526D?
21526D is a BOLT,MACHINE.
What parts can replace 21526D?
There are 9 known substitutes for 21526D: AN10H20A, MIL-DTL-1222J, T857 and 6 more. Substitute compatibility should be verified for your specific system.
Is 21526D still available?
21526D 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