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Technical Data Sheet
PartsTable / MRO / B1677
B1677 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The VALVE,BLEEDER,HYDRAULIC SYSTEM is a the manufacturer industrial component. Key specifications include handle: NOT FURNISHED, material: STEEL OVERALL, unit_type: FIXED RADIUS, surface_treatment: ZINC, shank_thread_diameter: 0.750 INCHES IN, shank_thread_location: INTERNAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-278-6555, 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→ B1677
NSN: 4820-00-278-6555
FSC: 4820
CAGE: 80724 — EIS BRAKE PARTS DIV OF STANDARD MOTOR PRODUCTS INC (USA)
SPECIFICATIONS
handleNOT FURNISHED
materialSTEEL OVERALL
unit_typeFIXED RADIUS
special_featuresA PART, ASSEMBLY, OR SYSTEM IDENTIFIED AS ESSENTIAL TO WEAPON SYSTEM PERFORMANCE OR OPERATION TO PRESERVE LIFE AND SAFETY OF PERSONNEL
surface_treatmentZINC
shank_thread_diameter0.750 INCHES IN
shank_thread_locationINTERNAL
end_item_identificationPOWER SUPPLY, TY 1
conduit_type_accommodatedELECTRICAL METALLIC
criticality_code_justificationFEAT
conduit_trade_size_accommodated0.500 INCHES IN
part_name_assigned_by_controlling_agencyPOWER SUPPLY
NSN4820-00-278-6555
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: B1677 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: ZINC
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESDIM. DATA,2-1/8 IN. LG OVER-ALL,7/16 IN.DIM. DATA,2-1/8 IN. LG OVER-ALL,7/16 IN. IN
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
23649Interchangeable
interchangeable cross-reference
interchangeable
968Interchangeable
interchangeable cross-reference
interchangeable
0-521-23Interchangeable
interchangeable cross-reference
interchangeable
968-0102Interchangeable
interchangeable cross-reference
interchangeable
DR12Interchangeable
interchangeable cross-reference
interchangeable
8840Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1677?
B1677 is a VALVE,BLEEDER,HYDRAULIC SYSTEM. It is classified as a MRO (MRO_GENERAL).
What parts can replace B1677?
There are 20 known substitutes for B1677: 23649, 968, 0-521-23 and 17 more. Substitute compatibility should be verified for your specific system.
Is B1677 still available?
B1677 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