The Microstop,countersink, cataloged under National Stock Number 5133-01-460-7641, 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 Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5133-01-460-7641 |
| Primary Part Number | ATI441HSF |
| Item Name | Microstop,countersink |
| FSC / FSG | 5133 / 51 — Drill Bits, Counterbores, and Countersinks: Hand and Machine |
| Manufacturer | Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL; FLANGED SKIRT; ACCEPTS UP TO 5/8 IN. DIA COUNTERSINK CUTTER WITH 1/4-28 THREADED SHANK; 0.001 IN. ADJUSTMENT; 5/16 IN. SHAFT TRAVEL; HEX LOCKNUT; 1/4 IN. DIA SHANK IN |
| 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 |
|---|---|
| ATI441HSF PRIMARY | Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA) |
| Reference | Meaning |
|---|---|
| AS441HSA | 5/9 Secondary reference Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc |
NSN 5133-01-460-7641 is a Microstop,countersink, manufactured by Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc, classified under FSC 5133, Drill Bits, Counterbores, and Countersinks: Hand and Machine. Status: active.
NSN 5133-01-460-7641 has 1 manufacturer part number on file: ATI441HSF (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc).
Key specifications for ATI441HSF: General Characteristics Item Description: STEEL; FLANGED SKIRT; ACCEPTS UP TO 5/8 IN. DIA COUNTERSINK CUTTER WITH 1/4-28 THREADED SHANK; 0.001 IN. ADJUSTMENT; 5/16 IN. SHAFT TRAVEL; HEX LOCKNUT; 1/4 IN. DIA SHANK IN. 1 specification is 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.