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PartsTable / COMPONENT / S138
S138 ✓ Verified by PartsTable
Hoover · 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 BACKSHELL,ELECTRICAL CONNECTOR is a Hoover industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT, load_type: RESISTIVE, head_style: HEXAGON, body_length: 0.920 INCHES NOMINAL IN, head_height: 0.375 INCHES NOMINAL IN, temp_rating: 85.0 CELSIUS DEGC. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-292-5937, 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
S138
NSN: 5306-00-292-5937
FSC: 5306
CAGE: 80212 — BAE SYSTEMS LAND & ARMAMENTS L.P. (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
load_typeRESISTIVE
head_styleHEXAGON
body_length0.920 INCHES NOMINAL IN
head_height0.375 INCHES NOMINAL IN
temp_rating85.0 CELSIUS DEGC
thread_class2B
overall_width0.719 INCHES NOMINAL IN
terminal_typeSOLDER LUG
thread_length1.000 INCHES MINIMUM IN
overall_height0.594 INCHES NOMINAL IN
overall_length0.812 INCHES NOMINAL IN
NSN5306-00-292-5937
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S138 · Hoover ⚠ 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 SERIES DESIGNATOR: UNF
•
SURFACE TREATMENT: CADMIUM OVERALL
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
THREAD LENGTH: 1.000 INCHES MINIMUM IN
•
THREAD QUANTITY PER INCH: 20
•
WIDTH BETWEEN FLATS: 0.750 INCHES NOMINAL IN
•
HEAD STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF
SURFACE TREATMENTCADMIUM OVERALL
FASTENER LENGTH1.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
THREAD LENGTH1.000 INCHES MINIMUM IN
THREAD QUANTITY PER INCH20
WIDTH BETWEEN FLATS0.750 INCHES NOMINAL IN
HEAD STYLEHEXAGON
HEAD HEIGHT0.375 INCHES NOMINAL IN
THREAD CLASS3A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
S138Upgraded Successor
successor cross-reference
successor
538Interchangeable
interchangeable cross-reference
interchangeable
A38Interchangeable
interchangeable cross-reference
interchangeable
A-A-1399Interchangeable
interchangeable cross-reference
interchangeable
E18-2Interchangeable
interchangeable cross-reference
interchangeable
B18-3Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S138?
S138 is a BACKSHELL,ELECTRICAL CONNECTOR manufactured by Hoover.
What parts can replace S138?
There are 11 known substitutes for S138: S138, 538, A38 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S138?
S138 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-292-5937. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026