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PartsTable / COMPONENT / CH637
CH637 ✓ Verified by PartsTable
— · PIPE SECTION
WHAT YOU NEED TO KNOW
Schedule = wall thickness, NOT diameter Nominal pipe size != actual OD
Sch 40 and Sch 80 same OD, different wall
PRODUCT OVERVIEW

RESISTOR,FIXED,WIRE WOUND,INDUCT. Key specifications include tip_type: FELT CHISEL, ink_color: YELLOW, body_length: 1.750 INCHES NOMINAL IN, flange_style: ROUND W / BOLT HOLES FIRST END, thread_class: 2A A, body_diameter: 0.312 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-657-4392, 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
CH637
NSN: 4720-00-657-4392
FSC: 4720
CAGE: 20796 — MUVIQ USA, LLC (USA)
SPECIFICATIONS
tip_typeFELT CHISEL
ink_colorYELLOW
body_length1.750 INCHES NOMINAL IN
flange_styleROUND W / BOLT HOLES FIRST END
thread_class2A A
body_diameter0.312 INCHES NOMINAL IN
terminal_typeTAB, SOLDER LUG
thread_length0.500 INCHES NOMINAL IN
inclosure_typeENCAPSULATED
overall_length0.750 INCHES NOMINAL IN
terminal_width0.188 INCHES NOMINAL IN
inside_diameter2.000 INCHES NOMINAL IN
NSN4720-00-657-4392
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: CH637 · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
12219Interchangeable
interchangeable cross-reference
interchangeable
503-S 19Interchangeable
interchangeable cross-reference
interchangeable
13319Interchangeable
interchangeable cross-reference
interchangeable
63735Interchangeable
interchangeable cross-reference
interchangeable
10VTQ302KInterchangeable
interchangeable cross-reference
interchangeable
7564396Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is CH637?
CH637 is a RESISTOR,FIXED,WIRE WOUND,INDUCT.
What parts can replace CH637?
There are 24 known substitutes for CH637: 12219, 503-S 19, 13319 and 21 more. Substitute compatibility should be verified for your specific system.
Is CH637 still available?
CH637 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