Bolt spacing

IQ-CAL-009REV 0NOT A CERTIFICATE

IQEG CALCULATION LAB

Bolt gauges on AU sections

IQ-CAL-009 · Rev 0 Indicative · 11/11/2026 · Not a certificate

INPUTS + RESULTSUNITS AS TABULATED

IQ Engineering Group · Sydney · IQ-CAL-009 · Bolt gauges on AU sections · millimetres, kN, kNm, MPa unless noted

DISCLAIMER

Location

FAMILY

SECTION

LOCATION

BOLT

HOLE

EDGE

ROWS ACROSS

NUMBER ALONG

PITCH ALONG mm

Recommended g=90. Typical max bolt M20. Web s_gw 90 (Table 40 pref. 1).

Glossary

s_gf: Flange gauge, centre-to-centre of the two bolt lines across the flange. ASI Table 40 preference 1.
s_gw: Web gauge, pitch of bolt lines down the web. ASI Table 40 / 43 preference 1.
b / c: Table 40/43: b = flange will not take this bolt. c = web will not take two lines at 50 mm.
e_min: AS 4100 cl. 9.3.2 / 15.2.3 rolled 1.25d, sawn 1.50d, sheared 1.75d. Approximate mm in the hole table.

Section + holes

310UB46.2 · 45.7 kg/m · I without fillets

ASI-style flange gauge. s_gf 90 · p 70 · Ø22 · e 25 · 2 along × 2 across

Two holes in the bottom flange, g = 90 mm, 38 mm from each flange tip. Along-member pitch 70 mm × 2 (not in this cross-section).

Fit

dh — mm22

e_min — mm25

p_min / p_max — mm50 / 177

s_gf / back — mmg = 90

s_gw — mm90

n across2

edge remaining — mm38.0

max typical boltM20

normal pitch — mm70

FITYES

bf ≥ g + 2 e_min and inner clearance to fillet + hole. Worked: 310UB46.2 bottom flange M20 standard rolled. g=90, e_min=25, bf=166 ≥ 140 OK. inner g/2=45 greater than 27.4 OK.

Section	bf	g / back	max bolt	fit @ M20
150UB14.0	75	g 0	M16	NO
150UB18.0	75	g 0	M16	NO
180UB16.1	90	g 50	M16	NO
180UB18.1	90	g 50	M16	NO
180UB22.2	90	g 50	M16	NO
200UB18.2	99	g 55	M16	NO
200UB22.3	133	g 70	M20	YES
200UB25.4	133	g 70	M20	YES
200UB29.8	134	g 70	M20	YES
250UB25.7	124	g 70	M20	YES
250UB31.4	146	g 70	M20	YES
250UB37.3	146	g 70	M20	YES
310UB32.0	149	g 90	M20	YES
310UB40.4	165	g 90	M20	YES
310UB46.2	166	g 90	M20	YES
360UB44.7	171	g 90	M20	YES
360UB50.7	171	g 90	M20	YES
360UB56.7	172	g 90	M20	YES
410UB53.7	178	g 90	M20	YES
410UB59.7	178	g 90	M20	YES
460UB67.1	190	g 90	M20	YES
460UB74.6	190	g 90	M20	YES
460UB82.1	191	g 90	M20	YES
530UB82.0	209	g 140	M24	YES
530UB92.4	209	g 140	M24	YES
610UB101	228	g 140	M24	YES
610UB113	228	g 140	M24	YES
610UB125	229	g 140	M24	YES

ASI Table 40 · universal · preference 1 first

s_gf flange gauge. s_gw web gauge. M20 unless noted. b = flange will not take this bolt. c = web will not take two lines at 50 mm.

Section	s_gf	s_gw
610UB / 530UB	140 / 90	140 / 90 / 70
460UB	90 / 140	90 / 70 · M24 140/90/70
410UB / 360UB / 310UB	90 / 70	90 / 70 · M24 140/90/70
310UB32.0	70	90 / 70 · M24 140/90/70
250UB	70 / 90	90 / 70 · M24 140/90/70
250UB25.7*	70 (M16)	90 / 70
200UB	70	90 / 70
200UB18.2*	50 (M16)	70 / 90
150UB	b (n=1 on CL)	70 · web c for two lines
310UC / 250UC	140 / 90	90 / 70 · M24 140/90/70
200UC	90 / 70	90 / 70
150UC	90	70
100UC	b	c

ASI Table 43 · PFC

Flange s_gf is a single gauge from the back of the web. Web s_gw preference 1 / 2 / 3.

Section	s_gf	s_gw
380×100	55	140 / 90 / 70
300×90	55	140 / 90 / 70
250×90	55	140 / 90 / 70
230×75	45	140 / 90 / 70
200×75	45	90 / 70
180×75	45	70 / 90
150×75	40	65