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MS51831, KNH, NAS1395, RKK > MS51831A - Heavy Duty & Thickwall - 4140 Alloy - Inch

Keensert® Inch & Mil-Spec Heavy Duty Inserts - MS51831A Series, Locking and Non-Locking - 4140 Alloy

Looking for 4140 Alloy Keenserts®?

We carry the MS51831A Heavy Duty series in both locking and non-locking styles.

Stock sizes include 8-32 through 1-12 in 4140 Alloy.

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Add to Cart and buy online or email us for a custom quote.  Most popular products are in stock and ship within 24 hours.

Can't find what you're looking for? Email us at [email protected] for a custom quote. "We have the right screw for you" is our motto after all!
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NAS1395-04 / KNH0440JMXSZ NAS1395-04 / KNH0440JMXSZ Equivalent | 4-40 Keensert® Alternative 4140 Alloy
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NAS1395-04L / KNHL0440JMXSZ NAS1395-04L / KNHL0440JMXSZ Equivalent | 4-40 Keensert® Alternative 4140 Alloy
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NAS1395-06 / KNH0632JMXSZ NAS1395-06 / KNH0632JMXSZ Equivalent | 6-32 Keensert® Alternative 4140 Alloy
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NAS1395-06L / KNHL0632JMXSZ NAS1395-06L / KNHL0632JMXSZ Equivalent | 6-32 Keensert® Alternative 4140 Alloy
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NAS1395-08 / KNH0832JMXSZ NAS1395-08 / KNH0832JMXSZ Equivalent | 8-32 Keensert® Alternative 4140 Alloy
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NAS1395-08L / KNHL0832JMXSZ NAS1395-08L / KNHL0832JMXSZ Equivalent | 8-32 Keensert® Alternative 4140 Alloy
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MS51831A101 / KNH1024JMXSY MS51831A101 / KNH1024JMXSY Equivalent | 10/24 Keensert® Alternative 4140 Alloy
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MS51831A101L / KNHL1024JMXSY MS51831A101L / KNHL1024JMXSY Equivalent | 10-24 Keensert® Alternative 4140 Alloy
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MS51831A102 / KNH420JMXSY MS51831A102 / KNH420JMXSY Equivalent | 1/4-20 Keensert® Alternative 4140 Alloy
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MS51831A102L / KNHL420JMXSY MS51831A102L / KNHL420JMXSY Equivalent | 1/4-20 Keensert® Alternative 4140 Alloy
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MS51831A103 / KNH518JMXSY MS51831A103 / KNH518JMXSY Equivalent | 5/16-18 Keensert® Alternative 4140 Alloy
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MS51831A103L / KNHL518JMXSY MS51831A103L / KNHL518JMXSY Equivalent | 5/16-18 Keensert® Alternative 4140 Alloy
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MS51831A104 / KNH616JMXSY MS51831A104 / KNH616JMXSY Equivalent | 3/8-16 Keensert® Alternative 4140 Alloy
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MS51831A104L / KNHL616JMXSY MS51831A104L / KNHL616JMXSY Equivalent | 3/8-16 Keensert® Alternative 4140 Alloy
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MS51831A105 / KNH714JMXSY MS51831A105 / KNH714JMXSY Equivalent | 7/16-14 Keensert® Alternative 4140 Alloy
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MS51831A105L / KNHL714JMXSY MS51831A105L / KNHL714JMXSY Equivalent | 7/16-14 Keensert® Alternative 4140 Alloy
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MS51831A106 / KNH813JMXSY MS51831A106 / KNH813JMXSY Equivalent | 1/2-13 Keensert® Alternative 4140 Alloy
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MS51831A106L / KNHL813JMXSY MS51831A106L / KNHL813JMXSY Equivalent | 1/2-13 Keensert® Alternative 4140 Alloy
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MS51831A107 / KNH912JMXSY MS51831A107 / KNH912JMXSY Equivalent | 9/16-12 Keensert® Alternative 4140 Alloy
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MS51831A107L / KNHL912JMXSY MS51831A107L / KNHL912JMXSY Equivalent | 9/16-12 Keensert® Alternative 4140 Alloy
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MS51831A108 / KNH1011JMXSY MS51831A108 / KNH1011JMXSY Equivalent | 5/8-11 Keensert® Alternative 4140 Alloy
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MS51831A108L / KNHL1011JMXSY MS51831A108L / KNHL1011JMXSY Equivalent | 5/8-11 Keensert® Alternative 4140 Alloy
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MS51831A109 / KNH1210JMXSY MS51831A109 / KNH1210JMXSY Equivalent | 3/4-10 Keensert® Alternative 4140 Alloy
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MS51831A109L / KNHL1210JMXSY MS51831A109L / KNHL1210JMXSY Equivalent | 3/4-10 Keensert® Alternative 4140 Alloy
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MS51831A110 / KNH1409JMXSY MS51831A110 / KNH1409JMXSY Equivalent | 7/8-9 Keensert® Alternative 4140 Alloy
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MS51831A110L / KNHL1409JMXSY MS51831A110L / KNHL1409JMXSY Equivalent | 7/8-9 Keensert® Alternative 4140 Alloy
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MS51831A111 / KNH1608JMXSY MS51831A111 / KNH1608JMXSY Equivalent | 1-8 Keensert® Alternative 4140 Alloy
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MS51831A111L / KNHL1608JMXSY MS51831A111L / KNHL1608JMXSY Equivalent | 1-8 Keensert® Alternative 4140 Alloy
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MS51831A201 / KNH1032JMX** MS51831A201 / NAS1395-3 / KNH1032JMX** Equivalent | 10-32 Keensert® Alternative 4140 Alloy
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MS51831A201L / KNHL1032JMX** MS51831A201L / NAS1395-3L / KNHL1032JMX** Equivalent | 10-32 Keensert® Alternative 4140 Alloy
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MS51831A202 / KNH428JMX** MS51831A202 / NAS1395-4 / KNH428JMX** Equivalent | 1/4-28 Keensert® Alternative 4140 Alloy
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MS51831A202L / KNHL428JMX** MS51831A202L / NAS1395-4L / KNHL428JMX** Equivalent | 1/4-28 Keensert® Alternative 4140 Alloy
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MS51831A203 / KNH524JMX** MS51831A203 / NAS1395-5 / KNH524JMX** Equivalent | 5/16-24 Keensert® Alternative 4140 Alloy
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MS51831A203L / KNHL524JMX** MS51831A203L / NAS1395-5L / KNHL524JMX** Equivalent | 5/16-24 Keensert® Alternative 4140 Alloy
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MS51831A204 / KNH624JMX** MS51831A204 / NAS1395-6 / KNH624JMX** Equivalent | 3/8-24 Keensert® Alternative 4140 Alloy
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MS51831A204L / KNHL624JMX** MS51831A204L / NAS1395-6L / KNHL624JMX** Equivalent | 3/8-24 Keensert® Alternative 4140 Alloy
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MS51831A205 / KNH720JMX** MS51831A205 / NAS1395-7 / KNH720JMX** Equivalent | 7/16-20 Keensert® Alternative 4140 Alloy
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MS51831A205L / KNHL720JMX** MS51831A205L / NAS1395-7L / KNHL720JMX** Equivalent | 7/16-20 Keensert® Alternative 4140 Alloy
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MS51831A206 / KNH820JMX** MS51831A206 / NAS1395-8 / KNH820JMX** Equivalent | 1/2-20 Keensert® Alternative 4140 Alloy
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MS51831A206L / KNHL820JMX** MS51831A206L / NAS1395-8L / KNHL820JMX** Equivalent | 1/2-20 Keensert® Alternative 4140 Alloy
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MS51831A207 / KNH918JMX** MS51831A207 / NAS1395-9 / KNH918JMX** Equivalent | 9/16-18 Keensert® Alternative 4140 Alloy
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MS51831A208 / KNH1018JMX** MS51831A208 / KNH1018JMX** Equivalent | 5/8-18 Keensert® Alternative 4140 Alloy
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MS51831A208L / KNHL1018JMX** MS51831A208L / NAS1395-10L / KNHL1018JMX** Equivalent | 5/8-18 Keensert® Alternative 4140 Alloy
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MS51831A209 / KNH1216JMX** MS51831A209 / NAS1395-11 / KNH1216JMX** Equivalent | 3/4-16 Keensert® Alternative 4140 Alloy
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MS51831A209L / KNHL1216JMX** MS51831A209L / NAS1395-11L / KNHL1216JMX** Equivalent | 3/4-16 Keensert® Alternative 4140 Alloy
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MS51831A210 / KNH1414JMXSY MS51831A210 / KNH1414JMXSY Equivalent | 7/8-14 Keensert® Alternative 4140 Alloy
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MS51831A210L / KNHL1414JMXSY MS51831A210L / KNHL1414JMXSY Equivalent | 7/8-14 Keensert® Alternative 4140 Alloy
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MS51831A211 / KNH1612JMXSY MS51831A211 / KNH1612JMXSY Equivalent | 1-12 Keensert® Alternative 4140 Alloy
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MS51831A211L / KNHL1612JMXSY MS51831A211L / KNHL1612JMXSY Equivalent | 1-12 Keensert® Alternative 4140 Alloy
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