Fixing Keys for Punches with Key Grooves - Round, Through Hole

Round fixing keys with a through-hole mounting style are used in punch-and-die tooling to lock a punch firmly in the holder plate. In practical shop setups, they help maintain punch positional repeatability during repeated press cycles where misalignment can translate into inconsistent part dimensions.

• Precision progressive die machining: Through-hole mounting supports stable punch alignment while the key and screw interface reduce micro-movement, which helps limit wear at the punch seating surface.
• Automotive and connector bracket forming: In high-frequency stamping, secure locking improves cycle-to-cycle consistency and protects sensitive features from shock-induced displacement.
• General industrial forming stations: The M4/M5/M6 screw compatibility simplifies integration across common punch tool plates and reduces downtime during tooling changes.

Choose the S45C or SKS3 construction for balanced strength and wear resistance under mechanical stress, and match the head thickness/plate thickness T (3 or 4.5 mm) to your punch holder geometry for proper clamping.

This component is offered in S45C or SKS3, both steel grades commonly used for punch tooling elements that require dimensional stability under load. The selection is typically driven by the balance between wear resistance and toughness during repeated mechanical cycling.

• S45C: A medium-carbon steel suited for durable mechanical performance after appropriate heat treatment. It is commonly used when you need strong clamping interfaces and good overall toughness.
• SKS3: A higher-performance variant often selected for improved resistance to wear at loaded contact areas, supporting longer service life in precision machining and pressing.

Heat treatment state is not specified in the provided data; in practice these steels are typically supplied or processed in a hardened condition appropriate to punch tooling, where hardness increases wear resistance but can reduce impact toughness if over-hardened.

For maximum life, coordinate material choice with your expected load, lubrication, and press cycle frequency.

Select the fixing key by matching the screw interface and the plate/head thickness to your punch holder and tool plate. The key is specified for M4, M5, or M6 screw fixing, and the head thickness/plate thickness T is available at 3 mm or 4.5 mm.

• Step 1 (fastener compatibility): Choose the version for your holder screws—use For M4, For M5, or For M6 to ensure correct threading engagement.
• Step 2 (thickness match): Verify that your punch mounting plate/holder thickness corresponds to T = 3 mm or T = 4.5 mm, so the key sits correctly under clamp load.
• Step 3 (fit and alignment): Because this is a locking feature for punch alignment, confirm hole location consistency in your punch/key groove and the holder plate to maintain positional repeatability.

These dimensions (T and screw specification) are fixed per variant; align your mold/tool cavity/core layout to the available key thickness rather than attempting to mix variants.