Selection criteria for self-tapping Ensat^® inserts

 

Material  Group	Base material	Recommended works standards	Recommended Ensat® version
I	Tempered light metal alloys more than 350 N/mm2 tensile strength	302/337 307/338 308	Steel case-hardened zinc plated
	Cast iron in higher hardness range. Brass, bronze and other non-ferrous metals.	302	Steel case-hardened zinc plated
II	Light metal alloys up to 350 N/mm2 tensile strength	302/337 307/338 308	Steel case-hardened zinc plated
	Cast iron	302	Steel case-hardened zinc plated
	Brittle-rigid condensation resin plastics and high-grade synthetic resins	302/337 307/338 308	Steel case-hardened zinc plated or Brass
III	Light metal alloys up to 300 N/mm2 tensile strength	302/337 307/338 308	Steel case-hardened zinc plated
	Soft cast iron	302	Steel case-hardened zinc plated
	Condensation resin plastics of medium hardness	302/337 307/338 308	Steel case-hardened zinc plated
		302	Brass
IV	Light metal alloys up to 250 N/mm2 tensile strength	302	Steel case-hardened zinc plated
	Soft metals and light metal alloys up to 180 N/mm2 tensile strength	302	Steel case-hardened zinc plated or stainless steel A1
	Soft condensation resin plastics laminates with resin bond	302	Steel case-hardened zinc plated or Brass or stainless steel A1
	Soft polymerisation-, polycondensation- and polyaddition plastic materials Hardwoods	302	Steel case-hardened zinc plated or Brass or stainless steel A1
V	Hardwoods	309	Brass
VI	Softwoods and plywood Wood fiber materials	309	Brass
VII	Soft polymerisation-, polycondensation- and polyaddition plastic materials	305	Brass

The recommended hole diameter depends on the Ensat® external thread, the strength and the physical characteristics of the work-piece material.

Hard and brittle materials require a larger hole than soft and flexible ones. Whenever necessary, the most suitable hole diameter should be determined through application testing.

Countersinking the hole is usually not necessary; however it would facilitate installation and possibly prevent damage to the workpiece surface. It also would enable the insert to be flush with the work-piece.

Material thickness:
Length of Ensat^® = shortest permissible material thickness A

Blind hole depth: Minimum depth B

Minimum wall thickness: The wall thickness is dependant upon
the hardness and / or strength of the workpiece material.

Recommendation for light metals:  S ≥ 0,2 to ≥ 0,6 d₂
Recommendation for cast iron: S ≥ 0,3 to ≥ 0,5 d₂

d₂ = Outside diameter [mm] of Ensat^® insert

D_A = + 0,2 to 0,4 mm
a = 1 to 1,5 x the pitch of the external thread

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