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H538-30-7 — SCREW,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

H538-30-7: SCREW,EXTERNALLY RELIEVED BODY.

The SCREW,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: KNURLED NO. 1, point_style: FLAT, head_diameter: 0.500 INCHES NOMINAL IN, fastener_length: 1.000 INCHES NOMINAL IN, thread_direction: RIGHT-HAND.

This part is cataloged in the U.S. Government catalog under NSN 5305-00-055-2985, 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
H538-30-7
NSN: 5305-00-055-2985
FSC: 5305 — Screws
CAGE: 83014 — HARTWELL CORPORATION (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleKNURLED NO. 1
point_styleFLAT
head_diameter0.500 INCHES NOMINAL IN
fastener_length1.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedLOCK WASHER
internal_drive_styleSLOT
externally_relieved_body_diameter_quantity1
NSN5305-00-055-2985
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: H538-30-7 · 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
•
FASTENER LENGTH: 1.000 INCHES NOMINAL IN
•
FEATURES PROVIDED: LOCK WASHER
•
HEAD STYLE: KNURLED NO. 1
•
THREAD DIRECTION: RIGHT-HAND
•
POINT STYLE: FLAT
•
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY: 1
•
INTERNAL DRIVE STYLE: SLOT
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
FASTENER LENGTH1.000 INCHES NOMINAL IN
FEATURES PROVIDEDLOCK WASHER
HEAD STYLEKNURLED NO. 1
THREAD DIRECTIONRIGHT-HAND
POINT STYLEFLAT
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY1
INTERNAL DRIVE STYLESLOT
MATERIALSTEEL CORROSION RESISTING OVERALL
HEAD DIAMETER0.500 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
55-493Reference document
Same NSN cross-reference
Reference document — Secondary reference
8506533-1Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H538-30-7?
H538-30-7 is a SCREW,EXTERNALLY RELIEVED BODY.
What parts can replace H538-30-7?
There are 2 known substitutes for H538-30-7: 55-493, 8506533-1. Substitute compatibility should be verified for your specific system.
What is the NSN for H538-30-7?
H538-30-7 is cataloged in the U.S. Government catalog under NSN 5305-00-055-2985. 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.