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Technical Data Sheet
1178-25 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The CRYSTAL UNIT,QUARTZ is a the manufacturer industrial component. Key specifications include material: GLASS COVER HOLDER, body_width: 0.402 INCHES MAXIMUM IN, end_radius: 0.406 INCHES NOMINAL IN, fork_depth: 1.875 INCHES NOMINAL IN, shank_length: 0.219 INCHES NOMINAL IN, thread_class: 2A A. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-152-8423, 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
1178-25
NSN: 5340-00-152-8423
FSC: 5340
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialGLASS COVER HOLDER
body_width0.402 INCHES MAXIMUM IN
end_radius0.406 INCHES NOMINAL IN
fork_depth1.875 INCHES NOMINAL IN
shank_length0.219 INCHES NOMINAL IN
thread_class2A A
hole_diameter0.436 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
overall_width0.435 INCHES MAXIMUM IN
thread_length0.219 INCHES NOMINAL IN
body_thickness0.150 INCHES MAXIMUM IN
overall_length0.530 INCHES MAXIMUM IN
shank_diameter0.190 INCHES NOMINAL IN
NSN5340-00-152-8423
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1178-25 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
STYLE DESIGNATOR: CLEVIS
NOMINAL THREAD SIZE: 0.438 INCHES ROD CONNECTION IN
FORK ARM THICKNESS: 0.250 INCHES NOMINAL IN
HOLE DIAMETER: 0.438 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD ALL MATERIAL RESPONSES OVERALL
THREAD LENGTH: 1.000 INCHES NOMINAL ROD CONNECTION IN
SHANK DIAMETER: 0.719 INCHES NOMINAL IN
FORK DEPTH: 1.875 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORCLEVIS
NOMINAL THREAD SIZE0.438 INCHES ROD CONNECTION IN
FORK ARM THICKNESS0.250 INCHES NOMINAL IN
HOLE DIAMETER0.438 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
THREAD LENGTH1.000 INCHES NOMINAL ROD CONNECTION IN
SHANK DIAMETER0.719 INCHES NOMINAL IN
FORK DEPTH1.875 INCHES NOMINAL IN
FORK SPAN WIDTH0.500 INCHES NOMINAL IN
THREAD CLASS2B ROD CONNECTION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
21616Upgraded Successor
successor cross-reference
successor
D21616Upgraded Successor
successor cross-reference
successor
2150700Upgraded Successor
successor cross-reference
successor
0033057Upgraded Successor
successor cross-reference
successor
13X1-7-16Upgraded Successor
successor cross-reference
successor
117825Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1178-25?
1178-25 is a CRYSTAL UNIT,QUARTZ.
What parts can replace 1178-25?
There are 14 known substitutes for 1178-25: 21616, D21616, 2150700 and 11 more. Substitute compatibility should be verified for your specific system.
Is 1178-25 still available?
1178-25 is currently cancelled.
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