Shielded RJ45 Plug for Cat5 Cable Runs
The Hirose TM21P-88P is a shielded 8p8c (RJ45) modular plug from the TM21P series, rated for Cat5 applications. It terminates round cable with solid or stranded 24 AWG conductors using an IDC (insulation displacement contact) method — no crimp tool required beyond a standard punch-down or IDC press. The translucent-clear housing and beige boot let you inspect the wire pair twists right up to the contact interface, which matters when you are certifying a link to the Cat5 specification.
What the Shielding and Cat5 Rating Mean for the Run
The shielded construction (copper alloy shield material) means this plug mates with a shielded RJ45 jack and requires a cable with a drain wire or foil shield to complete the ground path. Without that, the shield floats and you lose the EMI benefit. The Cat5 rating limits the frequency band to 100 MHz — adequate for 1000BASE-T but not for Cat6/6a applications at 250/500 MHz. If the run needs higher bandwidth, step to the TM31P-TM-88P, which is rated Cat6a. The protective latch cover (a molded tab over the standard RJ45 latch) prevents the plug from snagging on cable trays or adjacent ports during pulls — a practical detail for field-installed runs that get moved or re-routed.
IDC Termination — Wire Prep and Tooling
IDC termination accepts 24 AWG solid or stranded round cable. No stripping or crimping — the wire is pushed into the slot and the insulation is displaced by the contact beam. The translucent body lets you verify the wire order and the pair twist length before seating the IDC cover. The beige boot slides over the cable entry for strain relief.