What sizes is ISOKLAMP CFR available in?

ISK-08 to ISK-36, covering M8 to M36, with a take-up reserve from 0,30 mm at M8 to 1,10 mm at M36 and stack heights from 5,2 to 15,8 mm.

What temperature range does ISOKLAMP CFR cover?

The design envelope is −196 °C to +650 °C across the variant range: 42CrMo4 zinc-flake to +250 °C, 316L / A4-80 to +400 °C, and Alloy 718 from −196 °C to +650 °C.

When is ISOKLAMP not the right specification?

Blind joints where the indicator cannot be seen, extreme mass-critical airframe applications, joints where the ramp cannot be kept free of lubricant, very short grip lengths or very low preload, and excitation above 2 kHz.

Specifications

ISK-08 to ISK-36, covering M8 to M36. Ramp lead angle 4,5°, take-up reserve 0,30 to 1,10 mm, stack height 5,2 to 15,8 mm, bearing faces Ra ≤ 0,8 µm. Variants in 42CrMo4 zinc-flake, 316L / A4-80 and Alloy 718, giving a design envelope of −196 °C to +650 °C. All figures are design values, model-predicted; no physical testing of ISOKLAMP hardware has been performed.

Size table

Annex A dimensional schedule, ISK-08 to ISK-36. All dimensions in mm, angles in degrees.
Part	Thread	OD	ID	Stack height	Take-up reserve	Ramp lead angle
ISK-08	M8	16,0	8,4	5,2	0,30	4,5
ISK-10	M10	20,0	10,5	6,0	0,35	4,5
ISK-12	M12	24,0	13,0	7,0	0,45	4,5
ISK-16	M16	30,0	17,0	8,6	0,60	4,5
ISK-20	M20	37,0	21,0	10,2	0,70	4,5
ISK-24	M24	44,0	25,0	11,8	0,85	4,5
ISK-30	M30	56,0	31,0	13,8	1,00	4,5
ISK-36	M36	66,0	37,0	15,8	1,10	4,5

Materials and variants

Material variants and their service envelopes.
Variant	Rings	Spiral	Finish	Temperature
ISK-…-Z	42CrMo4, hardened	Spring steel	Zinc-flake, Cr(VI)-free	−50 to +250 °C
ISK-…-S	316L / A4-80	316 spring temper	Passivated	−100 to +400 °C
ISK-…-A	Alloy 718	Alloy 718	Bare, passivated	−196 to +650 °C

Surface finish and corrosion

Both bearing faces are plain, flat and untoothed, finished to Ra ≤ 0,8 µm, so the washer neither bites the mating face nor creates a crevice against it. No surface damage →

Design targets to ISO 9227 neutral salt spray: 720 h to first white rust and 1 000 h to red rust for the zinc-flake variant; the 316L and Alloy 718 variants are specified without a sacrificial coating.

Re-use

Installation

Confirm the bearing faces are clean, dry and free of burrs.
Fit in the position of the plain washer, indicator band outward and visible.
Run the nut down by hand to seating; there is no prevailing torque.
Tighten to the unchanged specified torque or angle for the bolt.
Do not lubricate the ramp faces. The one-way latch depends on ramp friction staying in the 0,11–0,16 band.
Record the indicator reading as the installed baseline.

Where ISOKLAMP is not the right specification

Blind joints where the indicator band cannot be seen — you lose half the value of the product.
Extreme mass-critical airframe structure, where the additional stack height and mass are not acceptable.
Joints where the ramp cannot be kept free of lubricant — oil mist, flooded housings, deliberate anti-seize on the washer faces.
Very short grip lengths or very low preload, where the recovered travel is a large fraction of total stretch.
Excitation above 2 kHz, which is outside the modelled take-up regime.

Questions

What sizes is ISOKLAMP CFR available in?: ISK-08 to ISK-36, covering M8 to M36, with a take-up reserve from 0,30 mm at M8 to 1,10 mm at M36 and stack heights from 5,2 to 15,8 mm.
What temperature range does ISOKLAMP CFR cover?: The design envelope is −196 °C to +650 °C across the variant range: 42CrMo4 zinc-flake to +250 °C, 316L / A4-80 to +400 °C, and Alloy 718 from −196 °C to +650 °C.
When is ISOKLAMP not the right specification?: Blind joints where the indicator cannot be seen, extreme mass-critical airframe applications, joints where the ramp cannot be kept free of lubricant, very short grip lengths or very low preload, and excitation above 2 kHz.