Product Line: Safety Blocks

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Safety blocks hold a press slide open so it can't close on anyone working in the die area during die setting, maintenance or repair. PRI supplies Protech Series 42 blocks with standard interlocks, Saf-T-Block adjustable and fixed blocks from 5 to 150 tons, and Pascal SLA slide locks that lock the slide with a switch.

Not sure what you need? Read our safety blocks guide for OSHA requirements and sizing, or send us your press details.

Frequently Asked Questions

Does OSHA require safety blocks?

Yes. OSHA 1910.217(d)(9)(iv) requires employers to provide and enforce the use of safety blocks whenever dies are being adjusted or repaired in a mechanical power press.

Do safety blocks need an interlock?

ANSI B11.19 requires electrical interlocking of die safety blocks to the machine's motor and control circuits, so the press can't run while a block is in use.

How do I size a safety block?

You need the static load (the weight of the slide, ram components and upper die) and the opening where the block goes, measured with the press at the top of stroke. Protech's rule of thumb is one ton of static load per cubic foot of bed area times shut height.

How many safety blocks do I need?

Divide the total static load by one block's rating. Larger straight side presses often need two or more, and two blocks should be placed at diagonal corners.

Should safety blocks be aluminum or magnesium?

Aluminum is preferred because it deforms under overload. Magnesium can fracture and throw shrapnel, and steel should never be used.

Safety Block Products