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Technical Data Sheet
PartsTable / MRO / B1004
B1004 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

RECEIVER-TRANSMITTER SUBASSEMBLY. Key specifications include material: STEEL, bore_shape: STRAIGHT, cone_width: 1.4440 INCHES NOMINAL IN, head_style: HEXAGON, inlet_type: OPEN, filter_type: OIL BATH. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-044-5504, 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→ B1004
NSN: 5305-00-044-5504
FSC: 5305
CAGE: 25567 — THE GORMAN-RUPP COMPANY DIV GORMAN-RUPP (USA)
SPECIFICATIONS
materialSTEEL
quantity2
bore_shapeSTRAIGHT
cone_width1.4440 INCHES NOMINAL IN
head_styleHEXAGON
inlet_typeOPEN
filter_typeOIL BATH
head_height0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM IN
outlet_typeSLEEVE
element_typeHOODED
oil_capacity4.0 PINTS
thread_class2A A
NSN5305-00-044-5504
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B1004 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HEAD STYLE: HEXAGON
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MINIMUM YIELD STRENGTH: 85 POUNDS PER SQUARE INCH LBS
•
MATERIAL: STEEL OVERALL
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 10P STYLE AND 5 GRADE
•
WIDTH BETWEEN FLATS: 0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MINIMUM YIELD STRENGTH85 POUNDS PER SQUARE INCH LBS
MATERIALSTEEL OVERALL
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10P STYLE AND 5 GRADE
WIDTH BETWEEN FLATS0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HEAD HEIGHT0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
13-1032Interchangeable
interchangeable cross-reference
interchangeable
FF-S-85 TY2ST10PGR5Interchangeable
interchangeable cross-reference
interchangeable
MS90725-164Interchangeable
interchangeable cross-reference
interchangeable
13003Interchangeable
interchangeable cross-reference
interchangeable
179795Interchangeable
interchangeable cross-reference
interchangeable
81301733Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1004?
B1004 is a RECEIVER-TRANSMITTER SUBASSEMBLY. It is classified as a MRO (MRO_GENERAL).
What parts can replace B1004?
There are 30 known substitutes for B1004: 13-1032, FF-S-85 TY2ST10PGR5, MS90725-164 and 27 more. Substitute compatibility should be verified for your specific system.
Is B1004 still available?
B1004 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