PartsTable
Technical Data Sheet
330-18 ✓ Verified by PartsTable
Trefl · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The SHIELD,SONAR TRANSDUCER HEAD is a Trefl industrial component. Key specifications include color: OLIVE DRAB, width: 0.500 INCHES NOMINAL IN, length: 6.000 INCHES IN, material: STEEL, nut_style: CASTELLATED, HEXAGON, body_style: STRAIGHT HANDLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-8090, 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
330-18
NSN: 5310-00-176-8090
FSC: 5310
CAGE: 80049 — DEPARTMENT OF THE AIR FORCE (USA)
SPECIFICATIONS
colorOLIVE DRAB
width0.500 INCHES NOMINAL IN
length6.000 INCHES IN
materialSTEEL
nut_styleCASTELLATED, HEXAGON
body_styleSTRAIGHT HANDLE
leg_length4.190 INCHES MINIMUM AND 15.840 INCHES MAXIMUM FIRST END IN
nut_height1.173 INCHES NOMINAL IN
body_length1.000 INCHES NOMINAL IN
finger_typeSPLIT END SINGLE FINGER
tapered_endNOT INCLUDED
beveled_edgeNOT INCLUDED
NSN5310-00-176-8090
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 330-18 · Trefl ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
WIDTH ACROSS FLATS: 1.687 INCHES NOMINAL IN
NOMINAL THREAD SIZE: 1.125 INCHES IN
THREAD SERIES: UNF
MATERIAL: STEEL OVERALL
SURFACE TREATMENT: CADMIUM AND ZINC OVERALL
NONDEFINITIVE SPEC/STD DATA: A TYPE AND 4 GRADE
NUT HEIGHT: 1.173 INCHES NOMINAL IN
THREAD QUANTITY PER INCH: 12
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS1.687 INCHES NOMINAL IN
NOMINAL THREAD SIZE1.125 INCHES IN
THREAD SERIESUNF
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM AND ZINC OVERALL
NONDEFINITIVE SPEC/STD DATAA TYPE AND 4 GRADE
NUT HEIGHT1.173 INCHES NOMINAL IN
THREAD QUANTITY PER INCH12
NUT STYLECASTELLATED, HEXAGON
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
427132Interchangeable
interchangeable cross-reference
interchangeable
USAF330-4Interchangeable
interchangeable cross-reference
interchangeable
330-4Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA4Interchangeable
interchangeable cross-reference
interchangeable
330-5Interchangeable
interchangeable cross-reference
interchangeable
USAF330-5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 330-18?
330-18 is a SHIELD,SONAR TRANSDUCER HEAD manufactured by Trefl.
What parts can replace 330-18?
There are 21 known substitutes for 330-18: 427132, USAF330-4, 330-4 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 330-18?
330-18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-8090. This indicates validated use in U.S. government and defense supply chains.
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