STAINLESS STEEL ADJUSTING SHAFT COLLAR DIN 705A

Adjusting Shaft Collar DIN 705A — Unlike the ring-and-groove retainers around it, the DIN 705A adjusting shaft collar doesn't need any machined feature on the shaft at all — it's a solid ring that slides to the required position and is locked in place with a grub screw bearing directly onto the shaft surface. That makes it the tool of choice wherever a component's axial position needs to be set during assembly, adjusted during commissioning, or changed later during maintenance: positioning bearings, gears, and pulleys along a shaft, acting as an adjustable end stop, taking up axial float in a stack of components, or serving as a temporary locating feature on a prototype or test rig before a permanent groove is machined. DIN 705 actually covers two distinct forms — Form A, the one-piece collar with a single grub screw (covered here), and Form B, a split or two-piece clamp design tightened with a pinch bolt around the full circumference, which grips more evenly and is easier to fit and remove on an assembled shaft. Because holding capacity depends entirely on the grub screw's point pressure and the friction grip it generates, rather than a mechanical interlock, these collars suit light-to-moderate axial loads rather than heavy, sustained thrust — anywhere genuine thrust capacity is needed, a circlip and shaft shoulder, or a keyed collar, is the safer specification. Material choice follows the same logic as elsewhere in the range: carbon steel is the standard, cost-effective option for dry indoor use, while A2 or A4 stainless collars are worth specifying for washdown, food, or outdoor environments — though it's worth noting that a stainless grub screw bearing onto a stainless shaft can be more prone to galling than a hardened steel point on a softer shaft, so a shaft flat or a harder-tipped grub screw is sometimes the better detail in an all-stainless assembly. Sizing is straightforward: match the bore diameter to the shaft, check the collar's outer diameter and width clear surrounding components, and select a grub screw size proportionate to the axial load and vibration the joint will see.

FAQs
What's the difference between DIN 705 Form A and Form B collars?
Form A (this range) is a one-piece collar located with a single grub screw; Form B is a split, two-piece design clamped around the shaft with a pinch bolt, which distributes clamping force more evenly around the circumference and is often easier to fit and remove without sliding the collar off the shaft end.

How does a DIN 705A collar differ from a circlip?
A circlip locks into a fixed groove and can only be fitted in one axial position; a shaft collar clamps onto the shaft with a grub screw and can be repositioned anywhere along its length. Collars are adjustable during setup; circlips are not.

Can a stainless grub screw slip on a stainless shaft?
Stainless-on-stainless contact can be more prone to galling and slipping under load than a hardened steel grub screw against a shaft, so for higher-torque or vibration-prone applications, a shaft flat for the grub screw to seat against, or a harder-tipped screw, improves grip.

Can the collar be repositioned after fitting?
Yes — that's the collar's main advantage over a grooved retainer: loosening the grub screw allows it to be slid to a new position and retightened, without any machining or replacement part needed.