Hex Head Bolts (Partial Thread)

Partial-thread hex head bolts have an unthreaded shank section and a threaded end, making them suitable for joints where a defined grip length, shear plane location or cleaner bearing shank is required. This range covers ISO 4014, DIN 931, ASTM F3125 reference and SAE J429 project requirements.

Material options include 40Cr, 42CrMo, SCM435 and 4140 with 8.8 / 10.9 / 12.9 strength grades. Partial-thread bolts are selected for railway brackets, automotive structures, renewable energy supports, heavy machinery and selected structural assemblies where the unthreaded shank should pass through the clamped parts.

HDG is common for outdoor steelwork, zinc flake and Geomet are selected for corrosion performance with controlled thickness, and black oxide is used in controlled machinery environments. RFQs should confirm grip length, thread length, coating, nut/washer system and certificate needs.

Dimensions & SpecificationsDIN 931 / ISO 4014

Technical Drawing

Dimensional Table

Grade AGrade B

Parameter	M1.6	M2	M2.5	M3	M3.5	M4	M5	M6	M7	M8	M10	M12	M14	M16	M18	M20	M22	M24
P	0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3
da/max	2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	7.8	9.2	11.2	13.7	15.7	17.7	20.2	22.4	24.4	26.4
ds/max	1.6	2	2.5	3	3.5	4	5	6	7	8	10	12	14	16	18	20	22	24
ds/min	1.46	1.86	2.36	2.86	3.32	3.82	4.82	5.82	6.78	7.78	9.78	11.73	13.73	15.73	17.73	19.67	21.67	23.67
e/min	3.41	4.32	5.45	6.01	6.58	7.66	8.79	11.05	12.12	14.38	18.9	21.1	24.49	26.75	30.14	33.53	35.72	39.98
k/max	1.22	1.52	1.82	2.12	2.52	2.92	3.65	4.15	4.95	5.45	6.58	7.68	8.98	10.18	11.72	12.72	14.22	15.22
k/min	0.98	1.28	1.58	1.88	2.28	2.68	3.35	3.85	4.65	5.15	6.22	7.32	8.62	9.82	11.28	12.28	13.78	14.78
r/min	0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.25	0.4	0.4	0.6	0.6	0.6	0.6	0.8	0.8	0.8
s/max	3.2	4	5	5.5	6	7	8	10	11	13	17	19	22	24	27	30	32	36
s/min	3.02	3.82	4.82	5.32	5.82	6.78	7.78	9.78	10.73	12.73	16.73	18.67	21.67	23.67	26.67	29.67	31.61	35.38