7034-BGM bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the 7034-BGM model number is decoded

7034 BGM is SKF's 170 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 170×260×42 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 170×260×42 mm (6.693×10.236×1.654 in), 45.0 mm radial section height, C 172 kN, C0 204 kN, Pu 5.85 kN.reference speed 2,800 r/min (thermal) and limiting speed 2,800 r/min (mechanical), which coincide for this size, catalogue mass 7650 g. Selection figures for 7034 BGM: the static-to-dynamic ratio C0/C is 1.19, Pu 5.85 kN is about 3 % of C, and catalogue mass works out to roughly 45 g per millimetre of bore. At the printed limiting speed of 2,800 r/min the mean pitch diameter dm ≈ 215.0 mm implies a dn value around 602k mm·r/min; the 2,800 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 260 over bore 170 is a 1.53× step for this size, and the 42 mm width gives a bore/width ratio of 4.05; use these ratios when housing space around the 170 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 170 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.
• Assign interference to the rotating ring — roughly m6 on a 170 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.
• Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.
• Greased positions should fill roughly 25–35 % of the free volume on a 7034-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• The steep 40° angle of 7034-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 7034 BGM as the single g brass execution; the other order numbers of the 7034 size are different products and may carry different ratings — always quote the full designation when purchasing.