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M-A4-157 — BRUSH,ELECTRICAL CONTACT

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

M-A4-157: BRUSH,ELECTRICAL CONTACT.

The BRUSH,ELECTRICAL CONTACT is a the manufacturer industrial component. Key specifications include width: 0.308 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, length: 0.562 INCHES NOMINAL IN, radius: 0.438 INCHES NOMINAL IN, material: ELECTROGRAPHITIC, thickness: 0.308 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, top_style: FLAT WITH RECTANGULAR SLOT. This part is cataloged in the U.S.

Government catalog under NSN 5977-00-165-0794, 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
M-A4-157
NSN: 5977-00-165-0794
FSC: 5977 — Electrical Contact Brushes and Electrodes
CAGE: 18783 — MIRAJ CORP (USA)
SPECIFICATIONS
width0.308 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
length0.562 INCHES NOMINAL IN
radius0.438 INCHES NOMINAL IN
materialELECTROGRAPHITIC
thickness0.308 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
top_styleFLAT WITH RECTANGULAR SLOT
body_styleRECTANGULAR COMMUTATOR
slot_depth0.062 INCHES NOMINAL IN
slot_width0.094 INCHES NOMINAL IN
special_featuresTOP RIGHT EDGE VEVELED 30.0 DEG
style_designatorONE PIECE
brush_shunt_length1.125 INCHES NOMINAL SINGLE SHUNT IN
NSN5977-00-165-0794
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available BRUSH,ELECTRICAL CONTACT TITLE COMPONENT PN M-A4-157 MFR BRUSH,ELECTRICAL CONTA
KEY FEATURES
•
OUTER EDGE TO SLOT EDGE DISTANCE: 0.109 INCHES NOMINAL IN
•
LENGTH: 0.562 INCHES NOMINAL IN
•
BODY STYLE: RECTANGULAR COMMUTATOR
•
RADIUS: 0.438 INCHES NOMINAL IN
•
TERMINAL HOLE DIAMETER: 0.139 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
TOP STYLE: FLAT WITH RECTANGULAR SLOT
•
SHUNT POSITION DESIGNATOR: 10
•
STYLE DESIGNATOR: ONE PIECE
TECHNICAL CHARACTERISTICS
OUTER EDGE TO SLOT EDGE DISTANCE0.109 INCHES NOMINAL IN
LENGTH0.562 INCHES NOMINAL IN
BODY STYLERECTANGULAR COMMUTATOR
RADIUS0.438 INCHES NOMINAL IN
TERMINAL HOLE DIAMETER0.139 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
TOP STYLEFLAT WITH RECTANGULAR SLOT
SHUNT POSITION DESIGNATOR10
STYLE DESIGNATORONE PIECE
MATERIAL DOCUMENT AND CLASSIFICATIONSTACKPOLE CARBON GRADE 43D MFR REF SINGLE MATERIAL RESPONSE
BRUSH SHUNT LENGTH1.125 INCHES NOMINAL SINGLE SHUNT IN
SUBSTITUTES & CROSS-REFERENCES 1
A4-157Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M-A4-157?
M-A4-157 is a BRUSH,ELECTRICAL CONTACT.
What parts can replace M-A4-157?
There is 1 known substitute for M-A4-157: A4-157. Substitute compatibility should be verified for your specific system.
What is the NSN for M-A4-157?
M-A4-157 is cataloged in the U.S. Government catalog under NSN 5977-00-165-0794. 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.