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Technical Data Sheet
PartsTable / COMPONENT / S1037
S1037 ✓ 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

The INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: MUSHROOM, stem_style: DOUBLE GROOVED, head_height: 0.2500 INCHES NOMINAL IN, neck_radius: 0.6200 INCHES NOMINAL IN, stem_length: 5.9220 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-5549, 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
S1037
NSN: 4730-00-278-5549
FSC: 4730
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleMUSHROOM
stem_styleDOUBLE GROOVED
head_height0.2500 INCHES NOMINAL IN
neck_radius0.6200 INCHES NOMINAL IN
stem_length5.9220 INCHES NOMINAL IN
stem_diameter0.4019 INCHES NOMINAL IN
chamfer_length0.0150 INCHES NOMINAL IN
outside_diameter1.5160 INCHES NOMINAL IN
seat_angle_in_deg45.0
first_groove_width0.0620 INCHES NOMINAL IN
second_groove_width0.0620 INCHES NOMINAL IN
NSN4730-00-278-5549
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: S1037 · 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
KEY FEATURES
•
THREAD CLASS: 2A A
•
THREAD SIZE: 7/8-18
•
SMALLEST INSIDE DIAMETER: 0.632 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.875 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
•
MATERIAL: STEEL
•
SEAT ANGLE IN DEG: 45.000
•
FABRICATION METHOD: BAR STOCK, MACHINED
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A A
THREAD SIZE7/8-18
SMALLEST INSIDE DIAMETER0.632 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.875 INCHES NOMINAL IN
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
MATERIALSTEEL
SEAT ANGLE IN DEG45.000
FABRICATION METHODBAR STOCK, MACHINED
OVERALL LENGTH0.797 INCHES NOMINAL IN
SCREW THREAD SERIES DESIGNATORUNS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
S1201Interchangeable
interchangeable cross-reference
interchangeable
S1037Interchangeable
interchangeable cross-reference
interchangeable
923Interchangeable
interchangeable cross-reference
interchangeable
41W5-8Interchangeable
Same NIIN cross-reference
interchangeable
41IF-10Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S1037?
S1037 is a INVERTED NUT,TUBE COUPLING.
What parts can replace S1037?
There are 5 known substitutes for S1037: S1201, S1037, 923 and 2 more. Substitute compatibility should be verified for your specific system.
Is S1037 still available?
S1037 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