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1638-B — ADJUSTING SCREW ASSEMBLY,BRAKE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1638-B: ADJUSTING SCREW ASSEMBLY,BRAKE.

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 U.S.

Government catalog 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
1638-B
NSN: 4730-00-289-1626
NIINs: 002891626, 012580860
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
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: 1638-B · 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
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
ASSEMBLY CLEARANCE RADIUS: 0.375 INCHES NOMINAL IN
•
SHANK LENGTH: 1.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ANGLE
•
NOMINAL THREAD SIZE: 0.125 INCHES IN
•
HEIGHT: 2.094 INCHES NOMINAL IN
•
ANGLE: 30.0 DEGREES
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
ASSEMBLY CLEARANCE RADIUS0.375 INCHES NOMINAL IN
SHANK LENGTH1.250 INCHES NOMINAL IN
STYLE DESIGNATORANGLE
NOMINAL THREAD SIZE0.125 INCHES IN
HEIGHT2.094 INCHES NOMINAL IN
ANGLE30.0 DEGREES
SPECIAL FEATURESSURFACE LOCATED BALL CHECK VALVE
SCREW THREAD SERIES DESIGNATORPTF-SPL SHORT
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
SUBSTITUTES & CROSS-REFERENCES 7
1638Reference document
Same NSN cross-reference
Reference document — Secondary reference
435MAA9Reference document
Same NSN cross-reference
Reference document — Secondary reference
KP805Reference document
Same NSN cross-reference
Reference document — Secondary reference
7-440-000102Reference document
Same NSN cross-reference
Reference document — Secondary reference
JP805Reference document
Same NSN cross-reference
Reference document — Secondary reference
52-D-340-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1638-B?
1638-B is a ADJUSTING SCREW ASSEMBLY,BRAKE.
What parts can replace 1638-B?
There are 7 known substitutes for 1638-B: 1638, 435MAA9, KP805 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1638-B?
1638-B is cataloged in the U.S. Government catalog under NSN 4730-00-289-1626. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.