Locking nuts and bolts

RIPP locking nuts and bolts with flange are a new offer of high-strength fasteners. They have a strength class of 90 (~8.8) and 100 (~10.9), zinc-lamellar coating or zinc metallization. The zinc-lamellar surface coating not only provides significantly higher corrosion resistance but also prevents hydrogen corrosion.

The minimum tensile strength of the RIPP locking nuts and bolts is 900 N/mm² or 1,000 N/mm². The minimum surface hardness of the locking flange teeth of 550 HV ensures reliable fixation of the fastener. The RIPP fastener differs significantly from similar DIN 6921 bolts and DIN 6923 nuts.

Even under dynamic loads, the hardened locking nuts and bolts with RIPP flange prevent self loosening and maintain a tension force in the threaded fastener above 80% of the original. The RIPP mount can be reused.

Product No. Description. Dimensions
Locking nuts and bolts with notched flange
88912 Turnkey locking bolt with socket head M6 x 12 – M12 x 50
88913 Hexagonal head locking bolt M5 x 10 – M16 x 70
M14 x 1.5 x 30 – M14 x 1.5 x 60
88914 Hexagonal locking nut M5 – M16
M14 x 1.5
Locking nuts and bolts with serrated flange
88933 Hexagonal head locking bolt M5 x 8 – M10 x 30
M12 x 20 – M16 x 40
88934 Hexagonal locking nut M5 – M10
M12/M16

Tightening torques and preloads

Compared to smooth bearing surfaces, the toothed or ribbed flange bearing surface has a significant effect on the tightening torque and thus on the preload. The optimal tightening torques are calculated based on real-world tests.

Tightening torques and preload for locking bolts 88913 and nuts 88914

The material of the parts that
connect		 Strength class 100/10
М5 М6 М8 М10 М12 M14x1.5 М16
F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm]
Steel R m < 800 MPa 9,000 11 12,600 19 23,200 42 37,000 85 54,000 130 74,000 250 102,000 330
Steel R m ≥ 800 MPa 9,000 10 12,600 18 23,200 37 37,000 80 54,000 120 74,000 240 102,000 310
Ductile iron 9,000 9 12,600 16 23,200 35 37,000 75 54,000 115 74,000 230 102,000 300

Tightening torques and preload for locking bolts 88912

The material of the parts that
connect		 Strength class 100/10
М5 М6 М8 М10 М12
F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm]
Steel R m < 800 MPa 9,000 13 12,600 24 23,200 45 37,000 90 54,000 150
Steel R m ≥ 800 MPa 9,000 11 12,600 20 23,200 42 37,000 85 54,000 140
Ductile iron 9,000 10 12,600 16 23,200 39 37,000 80 54,000 120

Tightening torques and preload for locking bolts 88933 and nuts 88934

The material of the parts that
connect		 Strength class 90/8 Strength class 100/10
М5 М6 М8 М10 М12 М16
F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm] F V [H] M A [Nm]
Steel 6,350 9 9,000 16 16,500 34 26,200 58 54,000 120 102,000 280
Ductile iron 6,350 7 9,000 13 16,500 28 26,200 49 54,000 105 102,000 260