Overview
Protech Series 42 safety blocks hold the press slide open during set-up and maintenance, and an interlock keeps the press from running while a block is in the die. Choose wedge-type blocks or adjustable-screw blocks, with the 42o series for smaller presses up to 35 tons of static load.
Key Features
- Two styles
- Wedge-type blocks are stackable; adjustable-screw blocks are quick to set and adapt to different openings.
- Standard interlock (42-01)
- An interlock plug and receptacle with chain comes standard on every block.
- Power cut-off in storage and in use
- Stored at the press with the plug connected, the press runs. Placed in the bed with the plug disconnected, the press can't run.
- Saw-tooth wedges
- Protech's saw-tooth wedge design keeps wedges from moving or squirting out under load.
- Block holder (Part No. 62814)
- A sheet metal holder mounts to the press to store the block and components when not in use.
Product Line / Models
Series 42 for larger presses and 42o for smaller presses, each in wedge and adjustable-screw styles:
- 42-XXW (wedges) – 2" to 60" range, 0.75" adjustment, up to 180–215 tons depending on length.
- 42-XXS / XXI / XXM / XXL (adjustable screw) – short, intermediate, medium and long screws with 3" to 15" of adjustment, 125 tons.
- 42o series – wedge and adjustable-screw blocks up to 30" for presses with up to 35 tons of static load.
- Extrusion, no screw (Part No. 51981) – 42o-size extrusion rated 45 to 50 tons.
Applications & Benefits
- Set-up and maintenance safety: Keeps the slide from closing on people working in the die area.
- Interlocked to the press: The press can't run while the block's plug is out of the control circuit.
- Straight side presses: Split the load across several blocks when one isn't enough.
Technical Specifications (Examples)
From Protech's Series 42 bulletin. See the spec sheet for 42o ratings by length.
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Adjustable screw (S, I, M, L) | | | |
How to Choose the Right Protech Safety Block
- Measure the length: with the die fully open, measure the space where the block will go (shut height plus stroke).
- Estimate the static load: Protech's rule of thumb is one ton per cubic foot of bed area times shut height, which builds in a two-to-one safety factor.
- Pick a style: wedges for a fixed opening, adjustable screw for varying openings.
- Divide the static load by one block's rating to get how many blocks you need.
- Add a block holder to store the block at the press.
Why Protech Safety Blocks Are Trusted
- Interlock standard: Every block ships with the 42-01 interlock plug and receptacle.
- Published ratings: Load ratings by style and length are in Protech's Series 42 bulletin.
- OSHA context: OSHA 1910.217 requires safety blocks whenever dies are adjusted or repaired. See our safety blocks guide.
Contact & Ordering
Need help picking the right model or getting a quote? Provide these details:
- Press make, type and tonnage
- Bed area and shut height
- Opening at the block location (shut height plus stroke)
- Wedge or adjustable screw, and how many blocks
- Whether you need a block holder
- Contact PRI to discuss specs, lead times, and installation support.
