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Technical Data Sheet
PartsTable / MRO / S1056
S1056 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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

INTERFACE UNIT,AUTOMATIC DATA PR. Key specifications include material: STEEL OVERALL, thickness: 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, hole_diameter: 0.760 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN, hardness_rating: 25.0 ROCKWELL C MAXIMUM, overall_diameter: 1.480 INCHES MINIMUM AND 1.520 INCHES MAXIMUM IN, features_provided: CASEHARDENED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-063-7919, 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
MRO→ MRO_GENERAL→ S1056
NSN: 4730-00-063-7919
FSC: 4730
CAGE: 25567 — THE GORMAN-RUPP COMPANY DIV GORMAN-RUPP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
hole_diameter0.760 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN
hardness_rating25.0 ROCKWELL C MAXIMUM
overall_diameter1.480 INCHES MINIMUM AND 1.520 INCHES MAXIMUM IN
features_providedCASEHARDENED
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-063-7919
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: S1056 · 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 29
A-8Interchangeable
interchangeable cross-reference
interchangeable
4TBWInterchangeable
interchangeable cross-reference
interchangeable
K1Interchangeable
K1
interchangeable
R8Interchangeable
interchangeable cross-reference
interchangeable
74001Interchangeable
interchangeable cross-reference
interchangeable
61660-013Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S1056?
S1056 is a INTERFACE UNIT,AUTOMATIC DATA PR. It is classified as a MRO (MRO_GENERAL).
What parts can replace S1056?
There are 29 known substitutes for S1056: A-8, 4TBW, K1 and 26 more. Substitute compatibility should be verified for your specific system.
Is S1056 still available?
S1056 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