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56-931 — Technical Data Sheet

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— · 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

RESISTOR,FIXED,WIRE WOUND,INDUCT. Key specifications include material: STEEL COMP E4340 OVERALL, nut_style: CASTELLATED, HEXAGON, nut_height: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System under NSN 4730-00-203-7093, 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
56-931
NSN: 4730-00-203-7093
FSC: 4730
CAGE: 41947 — MUELLER BRASS CO. (USA)
SPECIFICATIONS
materialSTEEL COMP E4340 OVERALL
nut_styleCASTELLATED, HEXAGON
nut_height1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch20
material_document_and_classificationMIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-203-7093
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 56-931 · 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 10
INSTABOND 396InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LOCTITE 569InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SM-B-187816InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
13216E6176-5InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
4730002037093InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
W2330InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 56-931?
56-931 is a RESISTOR,FIXED,WIRE WOUND,INDUCT.
What parts can replace 56-931?
There are 10 known substitutes for 56-931: INSTABOND 396, LOCTITE 569, SM-B-187816 and 7 more. Substitute compatibility should be verified for your specific system.
Is 56-931 still available?
56-931 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: October 2026