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18905A1 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

18905A1: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 1.125 INCHES NOMINAL IN, material: STEEL STANDOFF, thread_class: 2A RIGHT EXTERNAL A, thread_length: 0.812 INCHES NOMINAL RIGHT EXTERNAL IN, shoulder_length: 0.812 INCHES NOMINAL IN, thread_direction: RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD). This part is cataloged in the U.S.

Government catalog under NSN 5340-00-784-8031, 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
18905A1
NSN: 5340-00-784-8031
FSC: 5340 — Hardware, Commercial
CAGE: 29201 — JOHN DEER CONSUMER PRODUCTS INC (USA)
SPECIFICATIONS
length1.125 INCHES NOMINAL IN
materialSTEEL STANDOFF
thread_class2A RIGHT EXTERNAL A
thread_length0.812 INCHES NOMINAL RIGHT EXTERNAL IN
shoulder_length0.812 INCHES NOMINAL IN
thread_directionRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
nominal_thread_size0.438 INCHES RIGHT EXTERNAL IN
thread_quantity_per_inch20 RIGHT EXTERNAL
thread_series_designatorUNF RIGHT EXTERNAL
NSN5340-00-784-8031
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 18905A1 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
•
LENGTH: 1.125 INCHES NOMINAL IN
•
THREAD LENGTH: 0.812 INCHES NOMINAL RIGHT EXTERNAL IN
•
THREAD DIRECTION: RIGHT-HAND RIGHT EXTERNAL
•
NOMINAL THREAD SIZE: 0.250 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
•
THREAD CLASS: 2A RIGHT EXTERNAL A
TECHNICAL CHARACTERISTICS
LENGTH1.125 INCHES NOMINAL IN
THREAD LENGTH0.812 INCHES NOMINAL RIGHT EXTERNAL IN
THREAD DIRECTIONRIGHT-HAND RIGHT EXTERNAL
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
NOMINAL THREAD SIZE0.250 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
NOMINAL THREAD SIZE0.438 INCHES RIGHT EXTERNAL IN
THREAD CLASS2A RIGHT EXTERNAL A
THREAD CLASS2B LEFT INTERNAL (INCLUDES THRU THREAD)
THREAD QUANTITY PER INCH20 LEFT INTERNAL (INCLUDES THRU THREAD)
THREAD QUANTITY PER INCH20 RIGHT EXTERNAL
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 18905A1?
18905A1 is a STANDOFF,THREADED,SPACING.
What is the NSN for 18905A1?
18905A1 is cataloged in the U.S. Government catalog under NSN 5340-00-784-8031. 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.