// TECHNICAL RESOURCES
Keylocking insert size and part-number comparison.
Compare selected MS designations and Keensert references across miniature, lightweight, heavy-duty and extra-heavy-duty families.
// FAMILY AND MANUFACTURER REFERENCE
Compare the complete insert envelope
These selected nonlocking, passivated stainless references compare miniature, lightweight, heavy-duty and extra-heavy-duty inserts. The internal thread accepts the screw; the external thread fits the parent component. Matching the internal thread alone does not identify the same insert.
Keensert numbers below are selected manufacturer catalog relationships for the 303 CRES configuration. Material, finish, locking options and source requirements remain part of the full inquiry.
// THREAD AND LENGTH LOOKUP
Selected MS and Keensert part numbers
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| MS designation | Keensert reference | Family | Internal thread | External thread | Length (in) | Request pricing |
|---|---|---|---|---|---|---|
| MS51830-101 | KNCA0256J | Miniature | 2-56 UNJC-3B | 8-32 UNC-3A | .120 | Request quote → |
| MS51830-102 | KNCA0440J | Miniature | 4-40 UNJC-3B | 10-32 UNF-2A | .170 | Request quote → |
| MS51830-103 | KNC0632J | Miniature | 6-32 UNJC-3B | 12-28 UNF-2A | .170 | Request quote → |
| MS51830-104 | KNCA0832J | Miniature | 8-32 UNJC-3B | 1/4-28 UNF-2A | .220 | Request quote → |
| MS51830-105 | KN1024J | Lightweight | 10-24 UNJC-3B | 5/16-18 UNC-2A (mod.) | .310 | Request quote → |
| MS51830-106 | KN420J | Lightweight | 1/4-20 UNJC-3B | 3/8-16 UNC-2A (mod.) | .370 | Request quote → |
| MS51830-107 | KN518J | Lightweight | 5/16-18 UNJC-3B | 7/16-14 UNC-2A (mod.) | .430 | Request quote → |
| MS51830-108 | KN616J | Lightweight | 3/8-16 UNJC-3B | 1/2-13 UNC-2A (mod.) | .500 | Request quote → |
| MS51831-101 | KNH1024J | Heavy duty | 10-24 UNJC-3B | 3/8-16 UNC-2A (mod.) | .310 | Request quote → |
| MS51831-102 | KNH420J | Heavy duty | 1/4-20 UNJC-3B | 7/16-14 UNC-2A (mod.) | .370 | Request quote → |
| MS51831-103 | KNH518J | Heavy duty | 5/16-18 UNJC-3B | 1/2-13 UNC-2A (mod.) | .430 | Request quote → |
| MS51831-104 | KNH616J | Heavy duty | 3/8-16 UNJC-3B | 9/16-12 UNC-2A (mod.) | .500 | Request quote → |
| MS51832-101 | KNHXH1024J | Extra heavy duty | 10-24 UNJC-3B | 7/16-14 UNC-2A (mod.) | .310 | Request quote → |
| MS51832-102 | KNHXH420J | Extra heavy duty | 1/4-20 UNJC-3B | 1/2-13 UNC-2A (mod.) | .370 | Request quote → |
| MS51832-103 | KNHXH518J | Extra heavy duty | 5/16-18 UNJC-3B | 9/16-12 UNC-2A (mod.) | .430 | Request quote → |
| MS51832-104 | KNHXH616J | Extra heavy duty | 3/8-16 UNJC-3B | 5/8-11 UNC-2A (mod.) | .500 | Request quote → |
// READING THE COMPARISON
The same screw thread can require a different outside fit
For a 1/4-20 internal thread, MS51830-106 has a 3/8-16 external thread, MS51831-102 has 7/16-14, and MS51832-102 has 1/2-13. All three selected references have a nominal 0.370-inch length. Their outside fits are different.
The table covers nonlocking internal threads. Do not add L or carry another material or lubrication suffix across a manufacturer number without reviewing that configuration. Published lengths are identification references, not hole-preparation or installation instructions.
// SOURCE WITH WEBSON
Have a part number or bill of material?
Send the complete designation, quantity, required delivery date and documentation requirements. Webson will review your requirement for quotation.