Thread Inserts China Manufacturer
UNC/UNF Inch key-locking inserts provide outstanding strength and resistance to rotation and pullout forces post-installation. Locking keys firmly secure them by engaging with the parent material threads. These inserts come in inch and metric sizes, with a stainless steel solid bushing design guaranteeing top-notch internal threads. Installation demands no specialized tools—standard taps and drills suffice for hole preparation. Pre-assembled self-broaching keys establish the correct depth and ensure steadfast resistance against unintended rotation.
Material: In Carbon Steel – C1215 or equivalent ; In Stainless Steel – 303 or equivalent
Keys – 302 CRES or equivalent
Finish: Carbon Steel – Zinc Phosphate ; Stainless Steel – Passivated
Tolerances: ±.010 inch or ±.25 mm unless specified otherwise.
| Part number | Dimensions | |||||
| Standard “KNCA” | Self-locking “KNCAL” | Internal thread Ø | External thread Ø | Shear engagement inch² (mm²) | L1 inch (mm) | L4 inch (mm) |
| KNCA0256J | 2-56″ UNJC-3B | 8-32″ UNC-3A | 0,0157 (10,1) | 0,12 (3,05) | 0,088 (2,24) | |
| KNCAL0256J | 0,0157 (10,1) | 0,088 (2,24) | ||||
| KNCA0440J | 4-40″ UNJC-3B | 10-32″ UNF-2A | 0,0302(19,5) | 0,17 (4,32) | 0,125 (3,18) | |
| KNCAL0440J | 0,0302 (19,5) | 0,125(3,18) | ||||
| KNC0632J | 6-32″ UNJC-3B | 12-28″ UNF-2A | 0,0329 (21,2) | 0,17 (4,32) | 0,125 (3,18) | |
| KNCL0632J | 0,0329(21,2) | 0,125(3,18) | ||||
| KNCA0832J | 8-32″ UNJC-3B | 1/4-28″ UNF-2A | 0,0669 (43,2) | 0,22 (5,59) | 0,175(4,45) | |
| KNCAL0832J | 0,0669 (43,2) | 0,175 (4,45) | ||||
| Part number | Installation dimensions | Removal dimensions | |||||
| modified Core-Ø* inch | C’Sink-Ø inch | Installation thread | Hand installation tool part-no. | Drill | |||
| Thread | L2 min. inch (mm) | Ø inch (mm) | Depth inch (mm) | ||||
| KNCA0256J | .134+0.003 -0,001 | .166 + .001 – .000 | 8-32 UNC-2B | 0,140 (3,56) | TKNC02 | 0,113 (2,87) | 1/16 (1,59) |
| KNCAL0256J | |||||||
| KNCA0440J | .161+0.003 -0,001 | .194 + .001 -.000 | 10-32 UNF-2B | 0, 160 (4,06) | TKNC04 | 0,136 (3,45) | 3/32 (2,38) |
| KNCAL0440J | |||||||
| KNC0632J | .187 +0,003 -0,001 | .220+ .001 -.000 | 12-28 UNF-2B | 0,160 (4,06) | TKNC06 | 0,159 (4,04) | 3/32 (2,38) |
| KNCL0632J | |||||||
| KNCA0832J | .228 +0,003 -0,001 | .225+ .001 -.000 | 1/4-28 UNF-2B | 0,210 (5,33) | TKNC08 | 0,199 (5,05) | 1 /8 (3,18) |
| KNCAL0832J | |||||||
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