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Technical Data Sheet
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51540 ✓ Verified by PartsTable
Lindy · 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

Simply plug in the LINDY ExpressCard Multi-Card reader into your notebook and you're ready to read and write to many of the most popular digital memory card formats.<br><br>Featuring a single slot design, the card reader is compatible with both ExpressCard/34 and ExpressCard/54 slots and is capable of transferring data at up to 480 Mbps. Perfect for transferring photos or music. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-6318, indicating validated use in U.S.

government and defense logistics supply chains.

WHERE IT FITS
51540
NSN: 4730-00-278-6318
FSC: 4730
CAGE: 23862 — MILITARY VEHICLES OPN GENERAL MOTORS TRUCK AND BUS GROUP MS 2603-02 (USA)
SPECIFICATIONS
materialSTEEL BODY
nut_styleCAP
nut_height0.750 INCHES NOMINAL IN
design_typeNONREUSABLE
thread_class2B
body_diameter4.300 INCHES NOMINAL IN
thread_seriesUNF
thread_directionRIGHT-HAND
width_across_flats0.690 INCHES NOMINAL IN
body_overall_length16.000 INCHES NOMINAL IN
nominal_thread_size0.375 INCHES IN
bearing_surface_typeWASHER FACED
NSN4730-00-278-6318
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 51540 · Lindy ⚠ 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 19
PP046FBGInterchangeable
interchangeable cross-reference
interchangeable
708112Interchangeable
interchangeable cross-reference
interchangeable
K9388057Interchangeable
interchangeable cross-reference
interchangeable
10826Interchangeable
interchangeable cross-reference
interchangeable
204976Interchangeable
interchangeable cross-reference
interchangeable
07-204976Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51540?
51540 is a FILTER ELEMENT,FLUID manufactured by Lindy.
What parts can replace 51540?
There are 19 known substitutes for 51540: PP046FBG, 708112, K9388057 and 16 more. Substitute compatibility should be verified for your specific system.
Is 51540 still available?
51540 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