MS124651 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Helical coil insert, fine thread |
| Material | Corrosion-resistant steel, AMS 7245 (material and manufacture) |
| Procurement | MIL-I-8846 |
| Item | Value |
|---|---|
| Status | Check the current issue before design use. |
| Supersedes | MS21208 (in part) |
| Federal supply class | 5340 |
Dimensions by size
| Dimension | .099-56 | .112-48 | .138-40 | .164-36 | .190-32 | .250-28 | .3125-24 | .375-24 | .4375-20 | .500-20 | .5625-18 | .625-18 | .750-16 | .875-14 | 1.000-12 | 1.000-14 | 1.125-12 | 1.250-12 | 1.375-12 | 1.500-12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A min — A, min flat (view AB) | .0027 | .0043 | .0068 | .0059 | .0076 | .0085 | .0120 | .0120 | .0164 | .0164 | .0176 | .0176 | .0215 | .0267 | .0334 | .0267 | .0334 | .0334 | .0334 | .0334 |
| B min — B, min (free outer dia) | .131 | .147 | .173 | .204 | .236 | .306 | .380 | .448 | .524 | .592 | .666 | .733 | .876 | 1.021 | 1.169 | 1.156 | 1.304 | 1.439 | 1.575 | 1.710 |
| B max — B, max (free outer dia) | .146 | .162 | .193 | .224 | .256 | .326 | — | .468 | .549 | .617 | .691 | .758 | .901 | 1.051 | 1.199 | 1.186 | 1.334 | 1.469 | 1.610 | 1.745 |
| C — C, number of free coils (±.250 coil) | 3.375 | 3.375 | 3.500 | 3.875 | 4.125 | 5.000 | 5.500 | 6.875 | 6.625 | 7.875 | 8.000 | 9.000 | 9.750 | 9.875 | 9.625 | 11.500 | 11.125 | 12.500 | 13.750 | 15.250 |
| D min — D, min (section X-X) | .0163 | .0196 | .0241 | .0261 | .0295 | .0347 | .0410 | .0410 | .0500 | .0500 | .0560 | .0560 | .0636 | .0730 | .0861 | .0730 | .0861 | .0861 | .0861 | .0861 |
| D max — D, max (section X-X) | .0193 | .0226 | .0271 | .0301 | .0338 | .0387 | .0449 | .0449 | .0540 | .0540 | .0600 | .0600 | .0677 | .0770 | .0900 | .0770 | .0900 | .0900 | .0900 | .0900 |
| E min — E, min (section X-X) | .0126 | .0152 | .0189 | .0203 | .0233 | .0253 | .0305 | .0305 | .0378 | .0378 | .0416 | .0416 | .0477 | .0545 | .0649 | .0545 | .0649 | .0649 | .0649 | .0649 |
| E max — E, max (section X-X) | .0156 | .0182 | .0219 | .0243 | .0273 | .0313 | .0365 | .0365 | .0438 | .0438 | .0486 | .0486 | .0547 | .0625 | .0729 | .0625 | .0729 | .0729 | .0729 | .0729 |
| F — F, gage (section X-X) | .00893 | .01042 | .01250 | .01389 | .01563 | .01786 | .02083 | .02083 | .02500 | .02500 | .02778 | .02778 | .03125 | .03571 | .04167 | .03571 | .04167 | .04167 | .04167 | .04167 |
| H min — H, min (section X-X) | .0112 | .01313 | .01584 | .01764 | .01985 | .02270 | .02656 | .02656 | .03198 | .03198 | .03558 | .03558 | .04009 | .04589 | .05363 | .04589 | .05363 | .05363 | .05363 | .05363 |
| H max — H, max (section X-X) | — | .01353 | .01624 | .01804 | .02030 | .02320 | — | .02706 | .03248 | .03248 | .03608 | .03608 | .04059 | .04639 | .05413 | .04639 | .05413 | .05413 | .05413 | .05413 |
| J min — J, min (measured 30° from tang) | .124 | .134 | — | — | — | — | .359 | .422 | .494 | .556 | .625 | .688 | .820 | .955 | 1.094 | 1.080 | 1.219 | 1.344 | 1.469 | 1.594 |
| J max — J, max (measured 30° from tang) | .146 | .150 | — | — | — | — | .377 | .439 | .514 | .576 | .645 | .708 | .840 | .980 | 1.119 | 1.105 | 1.244 | 1.369 | 1.499 | 1.624 |
| P min — P, min | .072 | .060 | .100 | .117 | .130 | .173 | .203 | .235 | .281 | .313 | .344 | .375 | .453 | .500 | .526 | .526 | .557 | .679 | .689 | .811 |
| P max — P, max | .090 | .095 | .130 | .147 | .176 | .239 | .291 | .353 | .416 | .478 | .541 | .588 | .562 | .640 | .728 | .750 | .819 | .941 | 1.001 | 1.123 |
| Q — Q, angle | 75° - 150° | 75° - 150° | 25° - 100° | 20° - 100° | 15° - 90° | 15° - 70° | 15° - 55° | 15° - 75° | 15° - 75° | 15° - 75° | 15° - 75° | 15° - 75° | 15° - 75° | 15° - 75° | 15° - 75° | 15° - 75° | 10° - 70° | 10° - 70° | 10° - 70° | 20° - 70° |
| R min — R, min (tangent to flanks, view AB) | .0032 | .0038 | .0045 | .0050 | .0056 | .0064 | .0075 | .0075 | .0090 | .0090 | .0100 | .0100 | .0113 | .0129 | .0150 | .0129 | .0150 | .0150 | .0150 | .0150 |
| S min — S, min (view AB) | .0056 | .0065 | — | .0087 | .0098 | .0112 | .0130 | .0130 | — | .0156 | .0174 | .0174 | .0195 | .0223 | .0260 | .0223 | .0260 | .0260 | .0260 | .0260 |
Dimensions in inches, as tabulated in the standard; C is a number of coils and Q an angle. Letters as on the standard's drawing.
Part numbers
| Part no. | Size | Type | Nominal length, in | Approx. weight, lb per 100 |
|---|---|---|---|---|
| MS124670 | .099-56 | Notched | .099 | .0051 |
| MS124671 | .112-48 | Notched | .112 | .0099 |
| MS124653 | .138-40 | Notched | .138 | .0200 |
| MS124673 | .138-40 | Unnotched (inactive for design) | .138 | .0200 |
| MS124654 | .164-36 | Notched | .164 | .0325 |
| MS124674 | .164-36 | Unnotched (inactive for design) | .164 | .0325 |
| MS124655 | .190-32 | Notched | .190 | .0474 |
| MS124675 | .190-32 | Unnotched (inactive for design) | .190 | .0474 |
| MS124656 | .250-28 | Notched | .250 | .109 |
| MS124676 | .250-28 | Unnotched (inactive for design) | .250 | .109 |
| MS124657 | .3125-24 | Notched | .312 | .180 |
| MS124677 | .3125-24 | Unnotched (inactive for design) | .312 | .180 |
| MS124658 | .375-24 | Notched | .375 | .259 |
| MS124678 | .375-24 | Unnotched (inactive for design) | .375 | .259 |
| MS124659 | .4375-20 | Notched | .438 | .459 |
| MS124679 | .4375-20 | Unnotched (inactive for design) | .438 | .459 |
| MS124660 | .500-20 | Notched | .500 | — |
| MS124680 | .500-20 | Unnotched (inactive for design) | .500 | — |
| MS124661 | .5625-18 | Notched | .562 | .826 |
| Part no. | Size | Type | Nominal length, in | Approx. weight, lb per 100 |
|---|---|---|---|---|
| MS124681 | .5625-18 | Unnotched (inactive for design) | .562 | .826 |
| MS124662 | .625-18 | Notched | .625 | 1.010 |
| MS124682 | .625-18 | Unnotched (inactive for design) | .625 | 1.010 |
| MS124663 | .750-16 | Notched | .750 | 1.695 |
| MS124683 | .750-16 | Unnotched (inactive for design) | .750 | 1.695 |
| MS124664 | .875-14 | Notched | .875 | 2.564 |
| MS124684 | .875-14 | Unnotched (inactive for design) | .875 | 2.564 |
| MS124651 | 1.000-12 | Notched | 1.000 | 3.875 |
| MS124665 | 1.000-14 | Notched (inactive for design) | 1.000 | 3.448 |
| MS124685 | 1.000-14 | Unnotched (inactive for design) | 1.000 | 3.448 |
| MS124666 | 1.125-12 | Notched | 1.125 | 4.917 |
| MS124686 | 1.125-12 | Unnotched (inactive for design) | 1.125 | 4.917 |
| MS124667 | 1.250-12 | Notched | 1.250 | 6.254 |
| MS124687 | 1.250-12 | Unnotched (inactive for design) | 1.250 | 6.254 |
| MS124668 | 1.375-12 | Notched | 1.375 | 7.359 |
| MS124688 | 1.375-12 | Unnotched (inactive for design) | 1.375 | 7.359 |
| MS124669 | 1.500-12 | Notched | 1.500 | 8.799 |
| MS124689 | 1.500-12 | Unnotched (inactive for design) | 1.500 | 8.799 |
Every part number of MS124651 thru MS124690, notched and unnotched, by thread size. The standard governs.
Part number
What each code means
| Part | Meaning |
|---|---|
| Example | MS124651 — Notched insert for a 1.000-12 thread, nominal length 1.000 |
Notes from the standard
- Nominal length equals the basic thickness of plate for the insert assembly. The assembled length of the insert is as specified on MS33537.
- The number of free coils is counted, and the assembled length measured, 90° from the tang.
- An insert assembled in a tapped hole as specified in MS33537 produces a finished thread meeting all requirements of MIL-S-7742 and accepts external MIL-S-8879 threads.
- Ends of coil may be square or angular. The centerline of the wire section is square with the coil axis within 5°. The first coil diameter meets the free diameter 210° from the tang, within 20°. The notch is on the top face or edge of the first coil.
- Unnotched inserts are inactive for design after 15 Oct 1969: use notched inserts. Notched inserts can universally replace the unnotched inserts, but unnotched inserts cannot replace the notched inserts.
- Surface texture per ANSI B46.1-1962. Identification: part number and manufacturer's identification marked on the container. Do not use unassigned part numbers.
- MS124665 (1.000-14, notched) is inactive for design after 15 Oct 1969; there is no superseding standard.
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Calculators
Data sheets
Books
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Sources
- MS124651 thru MS124690 Rev. D, 24 Feb 1976 — Insert, CRES Helical Coil Fine Thread, 1 Dia Nominal Length — dimensions, part numbers and notes. Public domain, distribution unlimited.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.