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A51H10634-11 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

A51H10634-11: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY OVERALL, head_style: DOUBLE HEXAGON W/HOLEDOUBLE HEXAGON W/HOLE, grip_length: 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN, head_height: 0.608 INCHES MINIMUM AND 0.608 INCHES MINIMUM AND 0.628 INCHES MAXIMUM0.628 INCHES MAXIMUM IN, thread_class: 3A3A, grip_diameter: 0.6230 INCHES MINIMUM AND 0.6230 INCHES MINIMUM AND 0.6240 INCHES MAXIMUM0.6240 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-003-6555, 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
A51H10634-11
NSN: 5306-00-003-6555
FSC: 5306 — Bolts
CAGE: 61174 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP DIV NORTHROP GRUMMAN AERONAUTICS SYSTEMS (USA)
SPECIFICATIONS
materialTITANIUM ALLOY OVERALL
head_styleDOUBLE HEXAGON W/HOLEDOUBLE HEXAGON W/HOLE
grip_length1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN
head_height0.608 INCHES MINIMUM AND 0.608 INCHES MINIMUM AND 0.628 INCHES MAXIMUM0.628 INCHES MAXIMUM IN
thread_class3A3A
grip_diameter0.6230 INCHES MINIMUM AND 0.6230 INCHES MINIMUM AND 0.6240 INCHES MAXIMUM0.6240 INCHES MAXIMUM IN
thread_length0.848 INCHES MINIMUM AND 0.848 INCHES MINIMUM AND 0.898 INCHES MAXIMUM0.898 INCHES MAXIMUM IN
surface_finish16.0 MICROINCHES SIDES OF HEAD
fastener_length2.233 INCHES MINIMUM AND 2.233 INCHES MINIMUM AND 2.263 INCHES MAXIMUM2.263 INCHES MAXIMUM IN
thread_directionRIGHT-HANDRIGHT-HAND
width_between_flats0.682 INCHES MINIMUM AND 0.682 INCHES MINIMUM AND 0.691 INCHES MAXIMUM0.691 INCHES MAXIMUM IN
nominal_thread_diameter0.625 INCHES IN
NSN5306-00-003-6555
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A51H10634-11 · 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
•
SURFACE FINISH: 63.0 MICROINCHES GRIP
•
EXTENDED WASHER THICKNESS: 0.140 INCHES MINIMUM AND 0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM0.160 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.608 INCHES MINIMUM AND 0.608 INCHES MINIMUM AND 0.628 INCHES MAXIMUM0.628 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.233 INCHES MINIMUM AND 2.233 INCHES MINIMUM AND 2.263 INCHES MAXIMUM2.263 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 1.040 INCHES MINIMUM AND 1.040 INCHES MINIMUM AND 1.050 INCHES MAXIMUM1.050 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES GRIP
SURFACE FINISH63.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH16.0 MICROINCHES THREADS
SURFACE FINISH16.0 MICROINCHES SIDES OF HEAD
EXTENDED WASHER THICKNESS0.140 INCHES MINIMUM AND 0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM0.160 INCHES MAXIMUM IN
HEAD HEIGHT0.608 INCHES MINIMUM AND 0.608 INCHES MINIMUM AND 0.628 INCHES MAXIMUM0.628 INCHES MAXIMUM IN
FASTENER LENGTH2.233 INCHES MINIMUM AND 2.233 INCHES MINIMUM AND 2.263 INCHES MAXIMUM2.263 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER1.040 INCHES MINIMUM AND 1.040 INCHES MINIMUM AND 1.050 INCHES MAXIMUM1.050 INCHES MAXIMUM IN
THREAD LENGTH0.848 INCHES MINIMUM AND 0.848 INCHES MINIMUM AND 0.898 INCHES MAXIMUM0.898 INCHES MAXIMUM IN
SHANK UNTHREADED HOLE DIAMETER0.141 INCHES MINIMUM AND 0.151 INCHES MAXIMUM FIRST HOLE IN
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-004-7044 5306-00-007-6129 5306-00-008-7899 5306-00-009-4739 5306-00-118-7332 5306-00-151-1777 5306-00-255-4507 5306-01-101-2459
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A51H10634-11?
A51H10634-11 is a BOLT,CLOSE TOLERANCE.
What is the NSN for A51H10634-11?
A51H10634-11 is cataloged in the U.S. Government catalog under NSN 5306-00-003-6555. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.