Home Indexing and Positioning Elements Indexing plungers GN 817.5

GN 817.5

Indexing plungers

for precision locating, plunger conical

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Description

Specification

Types

Type B: without rest position

Type C: with rest position

Steel

blackened

Pin hardened and grounded

Knob Plastic (Polyamide PA)

black, matt

not removable

Information

Indexing plungers GN 817.5 allow highly accurate positioning, with the guidance made by the positioning bushings DIN 172 / DIN 179 with cylindrical bore. The actual indexing bore is fitted with positioning bushings GN 172.1 / GN 179.1 with conical bores.

The conical shape of the indexing pin / the indexing bore makes the positioning virtually clearance-free and therefore highly precise.

Type C is used for such applications where the plunger has to stay in its retracted position. To achieve this, the knob is rotated by 90° degrees after being retracted. A notch keeps the plunger in this position.

Range of indexing plungers

Technical information

ISO-Fundamental Tolerances

Plastic characteristics

Construction and assembly instructions

The length l₇ is determined by the penetration depth of the indexing pin into the cone of the bushing.

The length l₈ must ensure that the indexing pin fully disengages, bushing length and plate thickness olus any gap can then be selected within certain margins.

If engaged, the pin must have a minimum remaining stroke of 0.5 mm to make sure that the conical section of the pin is located without clearance in the cone of the guide bushing.

Two different plunger pin lengths l₁ are available for each indexing plunger diameter d₁ (see product table).

For a safe remaining stroke length: l₉ = l₁ - 0.5 mm

For mounting bushings with tolerance n6, a hole with tolerance H7 corresponding to the external diameter is usually provided.

A selection of suitable guide bushings DIN 172 and DIN 179 with cylindrical bore and guide bushings GN 172.1 / GN 179.1 with conical bore.

GN 817.5

	d₁ Pin h6	l₁	l₂	l₃	b	d₂	d₃	d₄	k	l₄	l₅	l₆	l₇	l₈ min.	l₈ max.	Spring load in N ≈ initial	Spring load in N ≈ end
Code																			Actions
GN 817.5-6-18-B	6	18	9	9	13	23	4.3	34	23	45	6	25	7	9	10	6	25	43
GN 817.5-6-18-C	6	18	9	9	13	23	4.3	34	23	45	6	25	7	9	10	6	25	46
GN 817.5-6-24-B	6	24	9	15	13	23	4.3	34	23	45	6	25	7	15	16	6	25	40
GN 817.5-6-24-C	6	24	9	15	13	23	4.3	34	23	45	6	25	7	15	16	6	25	50
GN 817.5-8-20-B	8	20	10.6	9.4	16	28	5.3	38	26	51	8	27	9	9.4	10	8.5	28	75
GN 817.5-8-20-C	8	20	10.6	9.4	16	28	5.3	38	26	51	8	27	9	9.4	10	8.5	28	75
GN 817.5-8-26-B	8	26	10.6	15.4	16	28	5.3	38	26	51	8	27	9	15.4	16	8.5	28	80
GN 817.5-8-26-C	8	26	10.6	15.4	16	28	5.3	38	26	51	8	27	9	15.4	16	8.5	28	84
GN 817.5-10-24-B	10	24	12.6	11.4	16	28	5.3	38	26	51	8	27	11	11.4	12	11.5	40	76
GN 817.5-10-24-C	10	24	12.6	11.4	16	28	5.3	38	26	51	8	27	11	11.4	12	11.5	40	83
GN 817.5-10-32-B	10	32	12.6	19.4	16	28	5.3	38	26	51	8	27	11	19.4	20	11.5	40	81
GN 817.5-10-32-C	10	32	12.6	19.4	16	28	5.3	38	26	51	8	27	11	19.4	20	11.5	40	87

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