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Technical Data Sheet
PartsTable / COMPONENT / S1621
S1621 ✓ 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 SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARE, seal_width: 1.844 INCHES NOMINAL IN, temp_rating: -40.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF, housing_bore_diameter: 1.875 INCHES NOMINAL IN, sealing_element_style: VERTICAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-426-2934, 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
S1621
NSN: 5306-00-426-2934
FSC: 5306
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARE
seal_width1.844 INCHES NOMINAL IN
temp_rating-40.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
housing_bore_diameter1.875 INCHES NOMINAL IN
sealing_element_styleVERTICAL
accommodated_shaft_diameter1.250 INCHES NOMINAL IN
NSN5306-00-426-2934
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S1621 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
035-221Interchangeable
interchangeable cross-reference
interchangeable
663UW10491W2Interchangeable
interchangeable cross-reference
interchangeable
CFSP-11517Interchangeable
interchangeable cross-reference
interchangeable
S1621Interchangeable
interchangeable cross-reference
interchangeable
0S-1621Interchangeable
Same NIIN cross-reference
interchangeable
28KP873Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S1621?
S1621 is a SEAL,PLAIN ENCASED.
What parts can replace S1621?
There are 9 known substitutes for S1621: 035-221, 663UW10491W2, CFSP-11517 and 6 more. Substitute compatibility should be verified for your specific system.
Is S1621 still available?
S1621 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