PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 1638B
1638B ✓ 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 ADJUSTING SCREW ASSEMBLY,BRAKE is a the manufacturer industrial component. Key specifications include angle: 30.0 DEGREES, height: 2.094 INCHES NOMINAL IN, material: STEEL OVERALL, shank_length: 1.250 INCHES NOMINAL IN, special_features: SURFACE LOCATED BALL CHECK VALVE, style_designator: ANGLE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-289-1626, 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
1638B
NSN: 4730-00-289-1626
FSC: 4730
CAGE: 95879 — STEWART-WARNER ALEMITE CORP (USA)
SPECIFICATIONS
angle30.0 DEGREES
height2.094 INCHES NOMINAL IN
materialSTEEL OVERALL
shank_length1.250 INCHES NOMINAL IN
special_featuresSURFACE LOCATED BALL CHECK VALVE
style_designatorANGLE
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.438 INCHES NOMINAL IN
nominal_thread_size0.125 INCHES IN
thread_quantity_per_inch27
assembly_clearance_radius0.375 INCHES NOMINAL IN
screw_thread_series_designatorPTF-SPL SHORT
NSN4730-00-289-1626
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1638B · 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
•
HEIGHT: 2.094 INCHES NOMINAL IN
•
ANGLE: 30.0 DEGREES
•
SCREW THREAD SERIES DESIGNATOR: PTF-SPL SHORT
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
ASSEMBLY CLEARANCE RADIUS: 0.375 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 27
•
NOMINAL THREAD SIZE: 0.125 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESSURFACE LOCATED BALL CHECK VALVE
HEIGHT2.094 INCHES NOMINAL IN
ANGLE30.0 DEGREES
SCREW THREAD SERIES DESIGNATORPTF-SPL SHORT
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
ASSEMBLY CLEARANCE RADIUS0.375 INCHES NOMINAL IN
THREAD QUANTITY PER INCH27
NOMINAL THREAD SIZE0.125 INCHES IN
STYLE DESIGNATORANGLE
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
16-38Interchangeable
interchangeable cross-reference
interchangeable
NAV145PC4Interchangeable
interchangeable cross-reference
interchangeable
NAV142PC18Interchangeable
interchangeable cross-reference
interchangeable
6240PL0931940Interchangeable
interchangeable cross-reference
interchangeable
PL1638Interchangeable
interchangeable cross-reference
interchangeable
GGG-C-400Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1638B?
1638B is a ADJUSTING SCREW ASSEMBLY,BRAKE.
What parts can replace 1638B?
There are 23 known substitutes for 1638B: 16-38, NAV145PC4, NAV142PC18 and 20 more. Substitute compatibility should be verified for your specific system.
Is 1638B still available?
1638B 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