MS24693 at a glance
Specification
| Item | Value |
|---|---|
| Head | flat countersunk, 100 degree |
| Drive | cross-recess (MS9006) |
| Thread series | coarse and fine (UNC-2A / UNF-2A) |
| Material | Aluminum alloy per QQ-A-225/6; brass per ASTM B16, B36, B134, B206 or B98 (UNS C65100 / C65500 copper-silicon); nickel-copper alloy per QQ-N-281; carbon steel per FED-STD-66; corrosion resistant steel per FED-STD-66 compositions 302, 303, 304, 305 or 316, or equal to/interchangeable with 16-18 or 18-8 chromium-nickel alloy steel (developed for cold heading). |
| Heat treatment | Aluminum alloy screws: 62 ksi minimum ultimate tensile strength, MIL-H-6088. |
| Item | Value |
|---|---|
| Finish | Anodize MIL-A-8625 Type I or II Class 1; black chemical finish MIL-F-495; black oxide MIL-C-13924; cadmium plate QQ-P-416 Type II Class 3; nickel plate QQ-N-290 Class 1 Grade E; clean and descale ASTM A380 (per material code). |
| Procurement | FF-S-92 |
| Thread specification | FED-STD-H28/2 |
| Status | Rev. K (28 Mar 1995). Notice 1 (21 Jun 2000): canceled and superseded by NASM24693; the part numbers are identical (MS24693-A28 = NASM24693-A28). Supersedes MS24693J and AN501. |
Dimensions by size
| Dimension, in | None | None | None | None | None | None | None | None | None |
|---|---|---|---|---|---|---|---|---|---|
| nominal | #0 | #2 | #4 | #6 | #8 | #10 | 1/4 | 5/16 | 3/8 |
| threads | .0600-80 UNF-2A | .0860-56 UNC-2A | .1120-40 UNC-2A – .1120-48 UNF-2A | .1380-32 UNC-2A – .1380-40 UNF-2A | .1640-32 UNC-2A – .1640-36 UNF-2A | .1900-24 UNC-2A – .1900-32 UNF-2A | .2500-20 UNC-2A – .2500-28 UNF-2A | .3125-18 UNC-2A – .3125-24 UNF-2A | .3750-16 UNC-2A – .3750-24 UNF-2A |
| A head dia | max sharp .119, min sharp .104, abs min .096 | max sharp .172, min sharp .156, abs min .143 | max sharp .225, min sharp .207, abs min .191 | max sharp .279, min sharp .257, abs min .238 | max sharp .332, min sharp .308, abs min .285 | max sharp .385, min sharp .359, abs min .333 | max sharp .507, min sharp .477, abs min .442 | max sharp .635, min sharp .600, abs min .556 | max sharp .762, min sharp .722, abs min .670 |
| F protrusion | .012 – .020 | .014 – .022 | .016 – .025 | .017 – .028 | .019 – .031 | .021 – .034 | .025 – .040 | .030 – .047 | .034 – .053 |
| G gaging dia | .074 | .121 | .167 | .214 | .261 | .307 | .415 | .526 | .638 |
| H head height ref | .026 | .037 | .049 | .060 | .072 | .083 | .110 | .138 | .165 |
| R fillet | .003 – .007 | .004 – .008 | .010 – .015 | .010 – .015 | .010 – .020 | .010 – .020 | .010 – .020 | .015 – .025 | .015 – .030 |
Minimum – maximum as tabulated in MS24693 Rev. K; letters as on the standard's drawing.
Part numbers and lengths
Every part number of MS24693 Rev. K, by thread size, each with its own link. * = the material code: build the full number below.
.0600-80 UNF-2A9 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*217 | .093 | +0/-.015 |
| MS24693-*218 | .125 | +0/-.015 |
| MS24693-*219 | .156 | +0/-.015 |
| MS24693-*420 | .187 | +0/-.031 |
| MS24693-*421 | .250 | +0/-.031 |
| MS24693-*422 | .312 | +0/-.031 |
| MS24693-*423 | .375 | +0/-.031 |
| MS24693-*424 | .437 | +0/-.031 |
| MS24693-*425 | .500 | +0/-.031 |
.0860-56 UNC-2A3 part numbers · tolerance +0/-.015
| Part no. | Length, in |
|---|---|
| MS24693-*15 | .093 |
| MS24693-*16 | .125 |
| MS24693-*17 | .156 |
.1120-40 UNC-2A13 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*1 | .187 | +0/-.031 |
| MS24693-*2 | .250 | +0/-.031 |
| MS24693-*3 | .312 | +0/-.031 |
| MS24693-*4 | .375 | +0/-.031 |
| MS24693-*5 | .437 | +0/-.031 |
| MS24693-*6 | .500 | +0/-.031 |
| MS24693-*7 | .625 | +0/-.031 |
| MS24693-*8 | .750 | +0/-.031 |
| MS24693-*9 | .875 | +0/-.031 |
| MS24693-*10 | 1.000 | +0/-.031 |
| MS24693-*11 | 1.125 | +0/-.062 |
| MS24693-*12 | 1.250 | +0/-.062 |
| MS24693-*14 | 1.500 | +0/-.062 |
.1120-48 UNF-2A16 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*201 | .187 | +0/-.031 |
| MS24693-*202 | .250 | +0/-.031 |
| MS24693-*203 | .312 | +0/-.031 |
| MS24693-*204 | .375 | +0/-.031 |
| MS24693-*205 | .437 | +0/-.031 |
| MS24693-*206 | .500 | +0/-.031 |
| MS24693-*207 | .625 | +0/-.031 |
| MS24693-*208 | .750 | +0/-.031 |
| MS24693-*209 | .875 | +0/-.031 |
| MS24693-*210 | 1.000 | +0/-.031 |
| MS24693-*211 | 1.125 | +0/-.062 |
| MS24693-*212 | 1.250 | +0/-.062 |
| MS24693-*213 | 1.375 | +0/-.062 |
| MS24693-*214 | 1.500 | +0/-.062 |
| MS24693-*215 | 1.625 | +0/-.062 |
| MS24693-*216 | 1.750 | +0/-.062 |
.1380-32 UNC-2A16 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*23 | .187 | +0/-.031 |
| MS24693-*24 | .250 | +0/-.031 |
| MS24693-*25 | .312 | +0/-.031 |
| MS24693-*26 | .375 | +0/-.031 |
| MS24693-*27 | .437 | +0/-.031 |
| MS24693-*28 | .500 | +0/-.031 |
| MS24693-*29 | .625 | +0/-.031 |
| MS24693-*30 | .750 | +0/-.031 |
| MS24693-*31 | .875 | +0/-.031 |
| MS24693-*32 | 1.000 | +0/-.031 |
| MS24693-*33 | 1.125 | +0/-.062 |
| MS24693-*34 | 1.250 | +0/-.062 |
| MS24693-*36 | 1.500 | +0/-.062 |
| MS24693-*38 | 1.750 | +0/-.062 |
| MS24693-*40 | 2.000 | +0/-.062 |
| MS24693-*42 | 2.500 | +0/-.093 |
.1380-40 UNF-2A19 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*224 | .250 | +0/-.031 |
| MS24693-*225 | .312 | +0/-.031 |
| MS24693-*226 | .375 | +0/-.031 |
| MS24693-*227 | .437 | +0/-.031 |
| MS24693-*228 | .500 | +0/-.031 |
| MS24693-*229 | .625 | +0/-.031 |
| MS24693-*230 | .750 | +0/-.031 |
| MS24693-*231 | .875 | +0/-.031 |
| MS24693-*232 | 1.000 | +0/-.031 |
| MS24693-*233 | 1.125 | +0/-.062 |
| MS24693-*234 | 1.250 | +0/-.062 |
| MS24693-*235 | 1.375 | +0/-.062 |
| MS24693-*236 | 1.500 | +0/-.062 |
| MS24693-*237 | 1.625 | +0/-.062 |
| MS24693-*238 | 1.750 | +0/-.062 |
| MS24693-*239 | 1.875 | +0/-.062 |
| MS24693-*240 | 2.000 | +0/-.062 |
| MS24693-*241 | 2.250 | +0/-.093 |
| MS24693-*242 | 2.500 | +0/-.093 |
.1640-32 UNC-2A16 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*46 | .250 | +0/-.031 |
| MS24693-*47 | .312 | +0/-.031 |
| MS24693-*48 | .375 | +0/-.031 |
| MS24693-*49 | .437 | +0/-.031 |
| MS24693-*50 | .500 | +0/-.031 |
| MS24693-*51 | .625 | +0/-.031 |
| MS24693-*52 | .750 | +0/-.031 |
| MS24693-*53 | .875 | +0/-.031 |
| MS24693-*54 | 1.000 | +0/-.031 |
| MS24693-*55 | 1.125 | +0/-.062 |
| MS24693-*56 | 1.250 | +0/-.062 |
| MS24693-*58 | 1.500 | +0/-.062 |
| MS24693-*60 | 1.750 | +0/-.062 |
| MS24693-*62 | 2.000 | +0/-.062 |
| MS24693-*64 | 2.500 | +0/-.093 |
| MS24693-*66 | 3.000 | +0/-.093 |
.1640-36 UNF-2A21 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*246 | .250 | +0/-.031 |
| MS24693-*247 | .312 | +0/-.031 |
| MS24693-*248 | .375 | +0/-.031 |
| MS24693-*249 | .437 | +0/-.031 |
| MS24693-*250 | .500 | +0/-.031 |
| MS24693-*251 | .625 | +0/-.031 |
| MS24693-*252 | .750 | +0/-.031 |
| MS24693-*253 | .875 | +0/-.031 |
| MS24693-*254 | 1.000 | +0/-.031 |
| MS24693-*255 | 1.125 | +0/-.062 |
| MS24693-*256 | 1.250 | +0/-.062 |
| MS24693-*257 | 1.375 | +0/-.062 |
| MS24693-*258 | 1.500 | +0/-.062 |
| MS24693-*259 | 1.625 | +0/-.062 |
| MS24693-*260 | 1.750 | +0/-.062 |
| MS24693-*261 | 1.875 | +0/-.062 |
| MS24693-*262 | 2.000 | +0/-.062 |
| MS24693-*263 | 2.250 | +0/-.093 |
| MS24693-*264 | 2.500 | +0/-.093 |
| MS24693-*265 | 2.750 | +0/-.093 |
| MS24693-*266 | 3.000 | +0/-.093 |
.1900-24 UNC-2A15 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*69 | .312 | +0/-.031 |
| MS24693-*70 | .375 | +0/-.031 |
| MS24693-*71 | .437 | +0/-.031 |
| MS24693-*72 | .500 | +0/-.031 |
| MS24693-*73 | .625 | +0/-.031 |
| MS24693-*74 | .750 | +0/-.031 |
| MS24693-*75 | .875 | +0/-.031 |
| MS24693-*76 | 1.000 | +0/-.031 |
| MS24693-*77 | 1.125 | +0/-.062 |
| MS24693-*78 | 1.250 | +0/-.062 |
| MS24693-*80 | 1.500 | +0/-.062 |
| MS24693-*82 | 1.750 | +0/-.062 |
| MS24693-*84 | 2.000 | +0/-.062 |
| MS24693-*86 | 2.500 | +0/-.093 |
| MS24693-*88 | 3.000 | +0/-.093 |
.1900-32 UNF-2A21 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*268 | .250 | +0/-.031 |
| MS24693-*269 | .312 | +0/-.031 |
| MS24693-*270 | .375 | +0/-.031 |
| MS24693-*271 | .437 | +0/-.031 |
| MS24693-*272 | .500 | +0/-.031 |
| MS24693-*273 | .625 | +0/-.031 |
| MS24693-*274 | .750 | +0/-.031 |
| MS24693-*275 | .875 | +0/-.031 |
| MS24693-*276 | 1.000 | +0/-.031 |
| MS24693-*277 | 1.125 | +0/-.062 |
| MS24693-*278 | 1.250 | +0/-.062 |
| MS24693-*279 | 1.375 | +0/-.062 |
| MS24693-*280 | 1.500 | +0/-.062 |
| MS24693-*281 | 1.625 | +0/-.062 |
| MS24693-*282 | 1.750 | +0/-.062 |
| MS24693-*283 | 1.875 | +0/-.062 |
| MS24693-*284 | 2.000 | +0/-.062 |
| MS24693-*285 | 2.250 | +0/-.093 |
| MS24693-*286 | 2.500 | +0/-.093 |
| MS24693-*287 | 2.750 | +0/-.093 |
| MS24693-*288 | 3.000 | +0/-.093 |
.2500-20 UNC-2A15 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*91 | .312 | +0/-.031 |
| MS24693-*92 | .375 | +0/-.031 |
| MS24693-*93 | .437 | +0/-.031 |
| MS24693-*94 | .500 | +0/-.031 |
| MS24693-*95 | .625 | +0/-.031 |
| MS24693-*96 | .750 | +0/-.031 |
| MS24693-*97 | .875 | +0/-.031 |
| MS24693-*98 | 1.000 | +0/-.031 |
| MS24693-*99 | 1.125 | +0/-.062 |
| MS24693-*100 | 1.250 | +0/-.062 |
| MS24693-*102 | 1.500 | +0/-.062 |
| MS24693-*104 | 1.750 | +0/-.062 |
| MS24693-*106 | 2.000 | +0/-.062 |
| MS24693-*108 | 2.500 | +0/-.093 |
| MS24693-*110 | 3.000 | +0/-.093 |
.2500-28 UNF-2A19 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*292 | .375 | +0/-.031 |
| MS24693-*293 | .437 | +0/-.031 |
| MS24693-*294 | .500 | +0/-.031 |
| MS24693-*295 | .625 | +0/-.031 |
| MS24693-*296 | .750 | +0/-.031 |
| MS24693-*297 | .875 | +0/-.031 |
| MS24693-*298 | 1.000 | +0/-.031 |
| MS24693-*299 | 1.125 | +0/-.062 |
| MS24693-*300 | 1.250 | +0/-.062 |
| MS24693-*301 | 1.375 | +0/-.062 |
| MS24693-*302 | 1.500 | +0/-.062 |
| MS24693-*303 | 1.625 | +0/-.062 |
| MS24693-*304 | 1.750 | +0/-.062 |
| MS24693-*305 | 1.875 | +0/-.062 |
| MS24693-*306 | 2.000 | +0/-.062 |
| MS24693-*307 | 2.250 | +0/-.093 |
| MS24693-*308 | 2.500 | +0/-.093 |
| MS24693-*309 | 2.750 | +0/-.093 |
| MS24693-*310 | 3.000 | +0/-.093 |
.3125-18 UNC-2A12 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*116 | .500 | +0/-.031 |
| MS24693-*117 | .625 | +0/-.031 |
| MS24693-*118 | .750 | +0/-.031 |
| MS24693-*119 | .875 | +0/-.031 |
| MS24693-*120 | 1.000 | +0/-.031 |
| MS24693-*121 | 1.125 | +0/-.062 |
| MS24693-*122 | 1.250 | +0/-.062 |
| MS24693-*124 | 1.500 | +0/-.062 |
| MS24693-*126 | 1.750 | +0/-.062 |
| MS24693-*128 | 2.000 | +0/-.062 |
| MS24693-*130 | 2.500 | +0/-.093 |
| MS24693-*132 | 3.000 | +0/-.093 |
.3125-24 UNF-2A12 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*316 | .500 | +0/-.031 |
| MS24693-*317 | .625 | +0/-.031 |
| MS24693-*318 | .750 | +0/-.031 |
| MS24693-*319 | .875 | +0/-.031 |
| MS24693-*320 | 1.000 | +0/-.031 |
| MS24693-*321 | 1.125 | +0/-.062 |
| MS24693-*322 | 1.250 | +0/-.062 |
| MS24693-*324 | 1.500 | +0/-.062 |
| MS24693-*326 | 1.750 | +0/-.062 |
| MS24693-*328 | 2.000 | +0/-.062 |
| MS24693-*330 | 2.500 | +0/-.093 |
| MS24693-*332 | 3.000 | +0/-.093 |
.3750-16 UNC-2A12 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*138 | .500 | +0/-.031 |
| MS24693-*139 | .625 | +0/-.031 |
| MS24693-*140 | .750 | +0/-.031 |
| MS24693-*141 | .875 | +0/-.031 |
| MS24693-*142 | 1.000 | +0/-.031 |
| MS24693-*143 | 1.125 | +0/-.062 |
| MS24693-*144 | 1.250 | +0/-.062 |
| MS24693-*146 | 1.500 | +0/-.062 |
| MS24693-*148 | 1.750 | +0/-.062 |
| MS24693-*150 | 2.000 | +0/-.062 |
| MS24693-*152 | 2.500 | +0/-.093 |
| MS24693-*154 | 3.000 | +0/-.093 |
.3750-24 UNF-2A12 part numbers
| Part no. | Length, in | Tol. |
|---|---|---|
| MS24693-*338 | .500 | +0/-.031 |
| MS24693-*339 | .625 | +0/-.031 |
| MS24693-*340 | .750 | +0/-.031 |
| MS24693-*341 | .875 | +0/-.031 |
| MS24693-*342 | 1.000 | +0/-.031 |
| MS24693-*343 | 1.125 | +0/-.062 |
| MS24693-*344 | 1.250 | +0/-.062 |
| MS24693-*346 | 1.500 | +0/-.062 |
| MS24693-*348 | 1.750 | +0/-.062 |
| MS24693-*350 | 2.000 | +0/-.062 |
| MS24693-*352 | 2.500 | +0/-.093 |
| MS24693-*354 | 3.000 | +0/-.093 |
Part number
What each code means
| Part | Meaning |
|---|---|
| Format | MS24693-<material letter><dash number>[B] |
| Example | MS24693-A28 = .1380-32 UNC-2A, .500 long, anodized aluminum alloy; MS24693-S2 = .1120-40 UNC-2A, .250 long, cadmium plated carbon steel; MS24693-206B = .1120-48 UNF-2A, .500 long, black oxide CRES |
| Length tolerance, .093 to .156 | +0/-.015 |
| Length tolerance, .187 to 1.000 | +0/-.031 |
| Length tolerance, 1.125 to 2.000 | +0/-.062 |
| Length tolerance, 2.250 to 3.000 | +0/-.093 |
| A | Material: anodized, aluminum alloy |
| B | Material: uncoated, brass |
| BB | Material: black chemical finish, brass |
| C | Material: cleaned and descaled, corrosion resistant steel |
| CB | Material: cadmium plated, brass |
| N | Material: uncoated, nickel-copper alloy |
| NB | Material: nickel plated, brass |
| S | Material: cadmium plated, carbon steel |
| U | Material: uncoated, copper-silicon alloy |
| B (after dash number) | Material: black oxide coated, corrosion resistant steel |
| Dash | Dash number from Table II selects thread size and length; only one dash number per part number |
Notes from the standard
- Head angle 100 degrees (99 to 101 degrees). Recess per MS9006. Plain sheared ends; header points acceptable per ANSI B18.6.3.
- Thread class 2A, FED-STD-H28/2. Threads extend to within two threads of the bearing surface of the head (or closer if practicable) for lengths up to and including 2.000; longer screws have a minimum complete thread of 1.750.
- Unthreaded portion diameter not less than the minimum pitch diameter nor more than the maximum major diameter of the thread.
- CRES screws of size .1380 (#6) and larger are marked on the head with one indented dash.
- Corrosion resistant steel screws: magnetic permeability per the procurement specification.
- Dash numbers are tabulated by thread size and length; lengths without a dash number in a column are not standard (dash numbers 13, 35, 37, 39, 41, 57, 59, 61, 63, 65 and similar gaps are unassigned).
- Table I head dimensions by nominal size apply to both the UNC and UNF thread of that size.
Sources
- MS24693 Rev. K, 28 Mar 1995 — Screw, Machine, Flat Countersunk Head, 100 Degree, Cross Recessed, UNC-2A and UNF-2A — dimensions, part numbers and notes. Public domain, distribution unlimited. Notices: 1 21 Jun 2000 Canceled and superseded by NASM24693. The Part Identification Number for MS24693K and the part number for NASM24693 are identical.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.