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Technical Data Sheet
PartsTable / COMPONENT / 556-18X12
556-18X12 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

IBM PCI-X 2-PORT SAS-300 ADAPTER. Key specifications include body_height: 0.170 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN, inside_width: 0.520 INCHES NOMINAL IN, inside_height: 0.460 INCHES NOMINAL IN, overall_width: 0.750 INCHES NOMINAL IN, inclosure_type: ENCASED, overall_height: 0.750 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-589-3502, 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
556-18X12
NSN: 4730-00-589-3502
FSC: 4730
CAGE: 53496 — SCHRAMM, INC. (USA)
SPECIFICATIONS
body_height0.170 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
inside_width0.520 INCHES NOMINAL IN
inside_height0.460 INCHES NOMINAL IN
overall_width0.750 INCHES NOMINAL IN
inclosure_typeENCASED
overall_height0.750 INCHES NOMINAL IN
overall_length3.500 INCHES NOMINAL IN
style_designatorRECTANGULAR TERMINAL/TERMINALS ON OPPOSITE SURFACES
features_providedMONOLITHIC
inclosure_materialMETAL
storage_temp_range-65.0 TO 150.0 CELSIUS DEGC
operating_temp_range+0.0 TO 70.0 CELSIUS DEGC
NSN4730-00-589-3502
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 556-18X12 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
FF-B-187AInterchangeable
interchangeable cross-reference
interchangeable
BT28315Interchangeable
interchangeable cross-reference
interchangeable
28315Interchangeable
interchangeable cross-reference
interchangeable
492E17Interchangeable
interchangeable cross-reference
interchangeable
2299796Interchangeable
interchangeable cross-reference
interchangeable
8330889Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 556-18X12?
556-18X12 is a IBM PCI-X 2-PORT SAS-300 ADAPTER.
What parts can replace 556-18X12?
There are 23 known substitutes for 556-18X12: FF-B-187A, BT28315, 28315 and 20 more. Substitute compatibility should be verified for your specific system.
Is 556-18X12 still available?
556-18X12 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