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Technical Data Sheet
PartsTable / COMPONENT / 51444-18-S-MF
51444-18-S-MF ✓ Verified by PartsTable
— · BOLT SCREW
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

The RING,RETAINING is a the manufacturer industrial component. Key specifications include usage_design: EXTERNAL, inside_diameter: 0.140 INCHES MINIMUM AND 0.146 INCHES MAXIMUM IN, major_thickness: 0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN, surface_treatment: CADMIUM AND CHROMATE, casehardening_indicator: NOT CASEHARDENED, material_hardness_rating: 66.5 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-102-5920, 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
51444-18-S-MF
NSN: 5325-01-102-5920
FSC: 5325
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL COMP 1060 OR STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1086 OR STEEL COMP 1090
ring_styleE
usage_designEXTERNAL
inside_diameter0.140 INCHES MINIMUM AND 0.146 INCHES MAXIMUM IN
major_thickness0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating66.5 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
cross-sectional_shape_styleRECTANGULAR
surface_treatment_document_and_classificationQQ-P-416, TYPE 2, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE
NSN5325-01-102-5920
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 51444-18-S-MF · 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
•
USAGE DESIGN: EXTERNAL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416, TYPE 2, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE
•
SURFACE TREATMENT: CADMIUM AND CHROMATE
•
MATERIAL: STEEL COMP 1060 OR STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1086 OR STEEL COMP 1090
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI 1060 ASSN STD 1ST MATERIAL RESPONSE OR SAE 1060 ASSN STD 1ST MATERIAL RESPONSE OR FED STD 66 FED STD ALL MATERIAL RESPONSES OR AISI/SAE 1070 OR 1078 OR 1080 OR 1084 OR 1090 ASSN STD ALL MATERIAL RESPONSES
•
MATERIAL HARDNESS RATING: 66.5 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
•
RING STYLE: E
•
INSIDE DIAMETER: 0.140 INCHES MINIMUM AND 0.146 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
USAGE DESIGNEXTERNAL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416, TYPE 2, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE
SURFACE TREATMENTCADMIUM AND CHROMATE
MATERIALSTEEL COMP 1060 OR STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1086 OR STEEL COMP 1090
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 1060 ASSN STD 1ST MATERIAL RESPONSE OR SAE 1060 ASSN STD 1ST MATERIAL RESPONSE OR FED STD 66 FED STD ALL MATERIAL RESPONSES OR AISI/SAE 1070 OR 1078 OR 1080 OR 1084 OR 1090 ASSN STD ALL MATERIAL RESPONSES
MATERIAL HARDNESS RATING66.5 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
RING STYLEE
INSIDE DIAMETER0.140 INCHES MINIMUM AND 0.146 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
4455Interchangeable
interchangeable cross-reference
interchangeable
13201E6414Interchangeable
interchangeable cross-reference
interchangeable
4417Interchangeable
interchangeable cross-reference
interchangeable
M22520/5-55Interchangeable
interchangeable cross-reference
interchangeable
Y102Interchangeable
interchangeable cross-reference
interchangeable
1AXX106Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51444-18-S-MF?
51444-18-S-MF is a RING,RETAINING.
What parts can replace 51444-18-S-MF?
There are 16 known substitutes for 51444-18-S-MF: 4455, 13201E6414, 4417 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51444-18-S-MF?
51444-18-S-MF is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-102-5920. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026