PartsTable
Technical Data Sheet
PartsTable / COMPONENT / SD21
SD21 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The TRANSISTOR is a the manufacturer industrial component. Key specifications include material: PLASTIC CONTAINER/CARTRIDGE, overall_length: 0.210 INCHES MAXIMUM IN, mounting_method: TERMINAL, terminal_length: 0.500 INCHES NOMINAL IN, overall_diameter: 0.230 INCHES MAXIMUM IN, special_features: MINIMUM VOLTAGE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-107-3017, 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
SD21
NSN: 4730-00-107-3017
FSC: 4730
CAGE: 72922 — GROSS MECHANICAL LABORATORIES INC (USA)
SPECIFICATIONS
materialPLASTIC CONTAINER/CARTRIDGE
overall_length0.210 INCHES MAXIMUM IN
mounting_methodTERMINAL
terminal_length0.500 INCHES NOMINAL IN
overall_diameter0.230 INCHES MAXIMUM IN
special_featuresMINIMUM VOLTAGE
style_designatorSTRAIGHT FLOW BASKET STRAINER W/BOLTED COVER
dc_voltage_rating24.0 VOLTS NOMINAL
features_providedHERMETICALLY SEALED CASE
internal_configurationFIELD EFFECT
semiconductor_materialSILICON
terminal_circle_diameter0.100 INCHES NOMINAL IN
NSN4730-00-107-3017
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: SD21 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
STYLE DESIGNATOR: STRAIGHT FLOW BASKET STRAINER W/BOLTED COVER
•
MATERIAL: PLASTIC CONTAINER/CARTRIDGE
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORSTRAIGHT FLOW BASKET STRAINER W/BOLTED COVER
MATERIALPLASTIC CONTAINER/CARTRIDGE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
SD34T24VDCInterchangeable
interchangeable cross-reference
interchangeable
SD2-1Interchangeable
interchangeable cross-reference
interchangeable
440-7447Interchangeable
interchangeable cross-reference
interchangeable
1855-0241Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy SD21?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is SD21?
SD21 is a TRANSISTOR.
What parts can replace SD21?
There are 4 known substitutes for SD21: SD34T24VDC, SD2-1, 440-7447 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SD21?
SD21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-107-3017. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — SD21

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026