The Drill,twist, cataloged under National Stock Number 5133-01-050-3669, is classified within Federal Supply Class 5133 (Drill Bits, Counterbores, and Countersinks: Hand and Machine) of the Hand Tools group. The manufacturer of record is New York Twist Drill Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5133-01-050-3669 |
| Primary Part Number | 3971 20 |
| Item Name | Drill,twist |
| FSC / FSG | 5133 / 51 — Drill Bits, Counterbores, and Countersinks: Hand and Machine |
| Manufacturer | New York Twist Drill Inc |
| Status | ACTIVE |
| Cutting End Style | GENERAL PURPOSE |
| Supplementary Features | O/A LENGTH DOES NOT INCLUDE THE THREAD LENGTH PAST THE HEXAGON NUT, THREADS = 1/4 IN. (+1/16 IN.) IN |
| Flute Length | 1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN |
| Nominal Cutting Diameter | 0.1610 INCHES IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Cutting Rotation Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS965 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Nondefinitive Spec/std Data | D TYPE AND 20 SIZE |
| Shank Style | EXTERNALLY THREADED W/HEX NUT |
| Flute Quantity | 2 |
| Material | STEEL ALLOY OVERALL |
| Point Angle | 135.0 DEGREES NOMINAL |
| Thread Series Designator | UNF |
| Point Type | SPLIT |
| Thread Quantity | 28 PER INCH |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 3971 20 | New York Twist Drill Inc (USA) |
| Reference | Meaning |
|---|---|
| NAS965 TYDSZ20 | 5/1 Secondary reference U.S. Government activity |
| NAS965 | 3/1 Design control — primary reference U.S. Government activity |
NSN 5133-01-050-3669 is a Drill,twist, manufactured by New York Twist Drill Inc, classified under FSC 5133, Drill Bits, Counterbores, and Countersinks: Hand and Machine. Status: active.
NSN 5133-01-050-3669 has 1 manufacturer part number on file: 3971 20 (New York Twist Drill Inc).
Key specifications for 3971 20: Cutting End Style: GENERAL PURPOSE; Supplementary Features: O/A LENGTH DOES NOT INCLUDE THE THREAD LENGTH PAST THE HEXAGON NUT, THREADS = 1/4 IN. (+1/16 IN.) IN; Flute Length: 1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN; Overall Length: 2.312 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN. 15 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.