Hex Bolt Metric 8.8 Fine Pitch Din961 8.8 Rf P-1.25

Hex bolt DIN 961 fine pitch 1.25 class 8.8is a hex head bolt for assemblies of machinery where M10 or M12 requieren fine pitch 1.25 for ajuste and strength al aflojamiento. At TECTUL it is quoted per unit and by actual available size, cross-checking diameter, length, pitch, material and standard before confirming price. This reference is differentiated by fine pitch 1.25, different from pitch ordinario M12 of 1.75 and al M10 of 1.50; therefore, it should not be replaced with a similar related item only because it has a hex head. The material reported for the lot is carbon steel. For class 8.8 and 10.9, selection is based on ISO 898-1 as the reference for mechanical properties; for DIN 933, DIN 960 or DIN 961, full, partial or fine thread geometry is validated against the drawing. For ASTM A325, A490 or A394 bolts, the project standard defines the bolt, nut, washer and assembly. We do not publish single load or torque values because they depend on lubrication, nut, washer, thread condition, grip length and engineering criteria.

Installation recommendations

• Verify the pitch with a thread gauge before installation; a coarse-pitch nut may start partially and damage the fine thread.
• Clean threads, holes and bearing surfaces before assembly to avoid false tightening.
• Do not mix metric thread with UNC or UNF; if in doubt, compare against a sample or drawing.
• Apply the torque or tightening method defined by engineering, considering lubrication and coating condition.
• Check grip length and remaining thread so the joint clamps on the parts, not on the thread end.

We dispatch to Bogotá, Medellín, Cali, Barranquilla and all of Colombia. Request a quote via WhatsApp for this hex bolt din 961 fine pitch 1.25 class 8.8, indicating size, quantity, pitch, finish and whether you need a compatible nut or washer.