The Pin,shoulder,headless, cataloged under National Stock Number 5315-01-253-5990, is classified within Federal Supply Class 5315 (Nails, Machine Keys, and Pins) of the Hardware and Abrasives group. The manufacturer of record is Smiths Aerospace, Inc., Electronic Systems-Grand Rapids. Government technical data includes 23 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5315-01-253-5990 |
| Primary Part Number | HS4939-2102 |
| Item Name | Pin,shoulder,headless |
| FSC / FSG | 5315 / 53 — Nails, Machine Keys, and Pins |
| Manufacturer | Smiths Aerospace, Inc., Electronic Systems-Grand Rapids |
| Status | ACTIVE |
| Shank Diameter | 0.190 INCHES NOMINAL IN |
| Second Shank Diameter | 0.209 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN |
| First End Taper Length | 0.047 INCHES NOMINAL IN |
| First End Location | THREADED END |
| Surface Treatment Document and Classification | QQ-P-35,TY 4 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.400 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN |
| First End Style | CHAMFERED |
| Shank Length | 0.530 INCHES NOMINAL IN |
| Style Designator | SHOULDER |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Second End Taper Length | 0.150 INCHES NOMINAL IN |
| First End Taper Angle | 45.0 DEGREES NOMINAL |
| Second End Relationship with First End | NOT IDENTICAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.190 INCHES IN |
| Second Shank Length | 0.275 INCHES NOMINAL IN |
| Shoulder Width Across Flats | 0.250 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Second End Tip Radius | 0.063 INCHES NOMINAL IN |
| Second End Style | CHAMFERED |
| Thread Class | 3A A |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| HS4939-2102 | Smiths Aerospace, Inc., Electronic Systems-Grand Rapids (USA) |
| HS4939-2102 | Nylok Llc (USA) |
| Reference | Meaning |
|---|---|
| HS4939-2102 | C/1 Advisory reference — outside the item-of-supply concept The Boeing Company |
| HS4939-2102 | 3/9 Design control — primary reference Mcdonnell Douglas Helicopter Co Inc |
| HS4939-2102 | 5/2 Secondary reference U.S. Government activity |
NSN 5315-01-253-5990 is a Pin,shoulder,headless, manufactured by Smiths Aerospace, Inc., Electronic Systems-Grand Rapids, classified under FSC 5315, Nails, Machine Keys, and Pins. Status: active.
NSN 5315-01-253-5990 has 2 manufacturer part numbers on file: HS4939-2102 (Smiths Aerospace, Inc., Electronic Systems-Grand Rapids), HS4939-2102 (Nylok Llc).
Key specifications for HS4939-2102: Shank Diameter: 0.190 INCHES NOMINAL IN; Second Shank Diameter: 0.209 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN; First End Taper Length: 0.047 INCHES NOMINAL IN; First End Location: THREADED END. 23 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.