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Technical Data Sheet
PartsTable / COMPONENT / 38577-4
38577-4 ✓ 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 INSULATOR,PLATE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, head_diameter: 0.389 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN, overall_width: 1.230 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN, overall_height: 0.011 INCHES MINIMUM AND 0.019 INCHES MAXIMUM IN, overall_length: 1.230 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN, fastener_length: 1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-901-3131, 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
38577-4
NSN: 5305-00-901-3131
FSC: 5305
CAGE: 2S125 — HILLMAN GROUP, INC., THE (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
head_diameter0.389 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
overall_width1.230 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN
overall_height0.011 INCHES MINIMUM AND 0.019 INCHES MAXIMUM IN
overall_length1.230 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN
fastener_length1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
style_designatorDRILLED, FLAT
unable_to_decodeUNABLE TO DECODE
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
fifth_hole_spacing0.647 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
first_hole_spacing0.162 INCHES MINIMUM AND 0.167 INCHES MAXIMUM IN
sixth_hole_spacing0.657 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
NSN5305-00-901-3131
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 38577-4 · 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 DOCUMENT AND CLASSIFICATION: ASTM B16 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM B36 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
HEAD DIAMETER: 0.389 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.216 INCHES IN
•
FASTENER LENGTH: 1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
NONMACHINE THREAD STYLE: GIMLET POINT (TYPE A, AB OR BA)
•
HEAD STYLE: FLAT COUNTERSUNK
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B16 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM B36 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HEAD DIAMETER0.389 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
NONMACHINE NOMINAL THREAD DIAMETER0.216 INCHES IN
FASTENER LENGTH1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
NONMACHINE THREAD STYLEGIMLET POINT (TYPE A, AB OR BA)
HEAD STYLEFLAT COUNTERSUNK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
ANSI B18.6.1Interchangeable
interchangeable cross-reference
interchangeable
FF-S-111 TY1ST2CInterchangeable
interchangeable cross-reference
interchangeable
MS35492-80Interchangeable
interchangeable cross-reference
interchangeable
149367Interchangeable
interchangeable cross-reference
interchangeable
FF-S-111Interchangeable
interchangeable cross-reference
interchangeable
385624Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 38577-4?
38577-4 is a INSULATOR,PLATE.
What parts can replace 38577-4?
There are 16 known substitutes for 38577-4: ANSI B18.6.1, FF-S-111 TY1ST2C, MS35492-80 and 13 more. Substitute compatibility should be verified for your specific system.
Is 38577-4 still available?
38577-4 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026